| Loading Rate Effects on the One-Dimensional Compressibility of Four Partially Saturated Soils |
DEC 86 |
373 pages |
| Authors:
John V. Farr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
 | The one-dimensional or uniaxial strain response of most soils subjected to high-intensity transient loads differs from the response measured under static conditions. As the time to peak pressure decreases, most soils exhibit a stiffening of the stress-strain response. That stiffening is usually referred to as a loading rate effect. Some researchers have suggested that, as the time to peak pressure approaches the submillisecond range, an increase up to fivefold in ... |
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| Mechanical Properties of Antelope Lake Soils |
NOV 86 |
59 pages |
| Authors:
Stephen A. Akers; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| This report documents a mechanical property investigation on undisturbed soil specimens obtained from a site at Antelope Lake within Tonapah Test Range near Tonapah, Nevada. The purposes of the investigation were to experimentally determine the mechanical responses of the Antelope Lake specimens and to provide representative material properies to Sandia National Labs. The completed laboratory test program obtained mechanical property data from 6 static unconfined compression tests and 12 static ... |
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| Repair, Evaluation, Maintenance, and Rehabilitation Research Program. Repair of Waterstop Failures: Case Histories |
NOV 86 |
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| Authors:
James E. McDonald; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
 | Nearly every concrete structure has joints that must be sealed to ensure its integrity and serviceability. This is particularly true for for monolith joints in hydraulic structures such as concrete dams and navigation locks. Embedded waterstops are generally used to prevent water passage through the monolith joints of such structures. A waterstop failure can result in various problems ranging from minor leakage with cosmetic concern to significant hydraulic forces and ... |
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| Development of a Theoretically Sound Cap Model for Fitting ISST-Type Material Behavior |
OCT 86 |
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| Authors:
George Y. Baladi; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| Incremental elastic-plastic constitutive models which include both an ultimate failure envelope and a work-hardening yield surface, or cap, are commonly used in ground shock calculations to simulate geologic material behavior. The basic premise of elastic-plastic constitutive models is the assumption that certain materials are capable of undergoing small plastic (permanent) as well as elastic (recoverable) strains at each loading increment. This report describes the development of a three-dimensional elastic-plastic work-hardening ... |
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| Evaluation of the Frost Resistance of Roller-Compacted Concrete Pavements |
OCT 86 |
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| Authors:
Steven A. Ragan; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| An investigation was conducted to evaluate the frost resistance of samples taken from roller-compacted concrete (RCC) pavements using laboratory testing procedures. Nine existing pavements were sampled and tested for microscopical determination of air-void content and parameters of the air-void system, resistance to rapid freezing and thawing, critical dilation, and compressive and flexural strength. The pavements ranged in age from 1 month to 8 years at the time of sampling. Preliminary ... |
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| Axisymmetric Strain Path Tests on Nellis Baseline Sand |
SEP 86 |
135 pages |
| Authors:
Stephen A. Akers; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report documents results of laboratory tests in which the responses of cylindrical specimens of Nellis baseline (NBH) sand were measured under imposed axisymmetric stain path loadings. Two strain path shapes (designates as shapes 2 and 3) were investigated, each having three levels of strain magnitude for a total of six strain paths. It was found that a unique stress path was produced by following a given strain path. This ... |
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| Axisymmetric Strain-Path and Stress-Path Tests on CARES-Dry Clayey Sand |
SEP 86 |
170 pages |
| Authors:
Stephen A. Akers; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report documents results of laboratory tests in which the responses of remolded and undisturbed specimens of CARES-Dry clayey sand were measured under controlled strain-path and stress-path loadings. The strain-path investigation measured the response of the CARES material when subjected to: (1) two strain-path shapes (designated SP2 and SP3) with three levels of peak strain (designated A, B, and C), (2) two strain-path shapes, (3) reverse strain-path tests, (4) one ... |
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| Mechanical Response of Dry Reid-Bedford Model Sand and Saturated Misers Bluff Sand |
SEP 86 |
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| Authors:
Bruce R. Phillips; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| This report presents a collection of data from laboratory mechanical property tests on dry Reid-Bedford Model sand and saturated MISERS BLUFF sand which were conducted by the US Army Engineer Waterways Experiment Station in support of a variety of projects since 1972. The data have been assembled for use in evaluating the ability of mathematical constitutive models to simulate the behavior of soils to complex dynamic loadings produced by both ... |
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| Mechanical Properties of Reid-Bedford Model Sand |
SEP 86 |
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| Authors:
Bruce R. Phillips; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| This report documents (a) the results of laboratory tests performed to supplement data previously reported on Reid-Bedford Model (RB) sand and (b) the results of an analysis of all of the RB laboratory data to develop representative laboratory material properties. The laboratory tests and analysis were conducted for use in evaluating the ability of mathematical constitutive models to simulate the behavior of soils subjected to complex dynamic loadings produced by ... |
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| Mechanical Properties of Misers Bluff Sand |
SEP 86 |
|
| Authors:
Bruce R. Phillips; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| This report documents (a) the results of laboratory tests performed to supplement data previously reported on MISERS BLUFF (MB) sand and (b) the results of an analysis of all of the MB laboratory data to develop representative laboratory material properties. The laboratory tests and analysis were conducted for use in evaluating the ability of mathematical constitutive models to simulate the behavior of soils to complex dynamic loadings produced by both ... |
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| Alkali-Silica Reaction in Concrete from Fontana Dam, North Carolina, Tennessee Valley Authority |
SEP 86 |
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| Authors:
Alan D. Buck; Katharine Mather; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| In 1973, the TVA requested petrographic examination of several concrete cores from Fontana Dam located in North Carolina to determine whether an alkali-silica reaction had occurred. A petrographic examination was made, and the results of it showed that there was evidence of alkali-silica reaction. While the evidence of reaction was conventional (gel, rims on aggregate particles, cracks), the type of aggregate was not variously described as quartzite or feldspathic muscovite ... |
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| Abrasion-Erosion Evaluation of Concrete Mixtures for Repair of Low-Flow Channel, Los Angeles, River |
SEP 86 |
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| Authors:
Terence C. Holland; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| The work described in this report involved abrasion-erosion testing of several concrete mixtures containing silica fume to evaluate the relative potential of the several mixtures to resist such attack. The mixtures were candidates for use in repair work to be conducted by the US Army Engineer District, Los Angeles. Concrete was placed in the field between 21 and 23 September 1983. Conclusions included (1) the mixtures tested could provide excellent ... |
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| Abrasion-Erosion Evaluation of Concrete Mixtures for Stilling Basin Repairs, Kinzua Dam, Pennsylvania |
SEP 86 |
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| Authors:
Terence C. Holland; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report covers the execution and results of studies supplementing those given in report No. 1. The present work included development of additional concrete mixtures containing silica fume and high-range water-reducing admixtures (HRWRA). Abrasion-erosion testing was done on specimens from some mixtures. Trial placements of two such mixtures were made and reviewed. Finally, assistance was provided to the US Army Engineer District, Pittsburgh in preparation and review of specifications for ... |
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| Posttest Analysis of a Laboratory-Cast Monolith of Salt-Saturated Concrete |
SEP 86 |
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| Authors:
Lillian D. Wakeley; Toy S. Poole; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| A salt-saturated concrete was formulated for laboratory testing of cementitious mixtures with potential for use in disposal of radioactive wastes in a geologic repository in halite rock. Cores were taken from a laboratory-cast concrete monolith on completion of tests of permeability, strain and stress. The cores were analyzed for physical and chemical evidence of brine migration through the concrete, and other features with potential impact on installation of crete plugs ... |
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| Procedure for Assembling WES Column-Based Soil Stress Gages |
SEP 86 |
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| Authors:
Denis D. Rickman; Howard G. White; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| This report describes the present procedure used in the fabrication of WES column-based soil stress gages along with a complete set of machine drawings. The gage is capable of both static and dynamic stress measurements up to 50 ksi in various types of soils. It has been laboratory- and field-evaluated in several soil types, and is being used routinely for soil stress measurement by the Waterways Experiment Station. There is ... |
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| Dynamic Failure Tests and Analysis of a Model Concrete Dam |
SEP 86 |
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| Authors:
C. D. Norman; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| A 1:60-scale model of the highest nonoverflow monolith of Koyna Dam was constructed on a foundation block and subjected to an impact force which produced cracking in the upper portions of the dam. The foundation block was connected to a massive concrete reaction structure by Belleville springs. The impact force was provided by a 1,000 lb wrecking ball mass moving as a pendulum. Instrumentation consisted of embedded strain gages and ... |
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| Behavior of Partially Restrained Reinforced Concrete Slabs |
SEP 86 |
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| Authors:
L. K. Guice; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This study was performed in conjunction with a Federal Emergency Management Agency program ot plan, design, and construct Keyworker blast shelters. Keyworker shelters are box-type shelters in which damage is more likely in the roof slab than in the walls or floor. This study investigates the effect of partial edge restraint on the strength, ductility, and failure mechanisms of a slab. Sixteen one-way, reinforced concrete plate elements were tested in ... |
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| Development and Field Placement of an Expansive Salt-Saturated Concrete (ESC) for the Waste Isolation Pilot Plant (WIPP) |
SEP 86 |
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| Authors:
Lillian D. Wakeley; Donald M. Walley; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| An expansive salt-saturated concrete (ESC) was proportioned for placement underground in halite rock at the Waste Isolation Pilot Plant (WIPP) site, near Carlsbad, New Mexico. Requirements for this concrete were: (1) to be chemically compatible with the host rock; (2) to remain pumpable for four hours: (3) to give net volume increase beginning at an early age, and continuing until creep closure of the salt assures sealing at the rock ... |
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| WES (Waterways Experiment Station) High-Pressure Uniaxial Strain and Triaxial Shear Test Equipment |
AUG 86 |
83 pages |
| Authors:
Stephen A. Akers; Paul A. Reed; John Q. Ehrgott; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| In order to investigate the effective stress response of fully saturated soil under high total stress (>69 MPa), two test devices were designed. Both devices are capable of back-pressure saturating test specimens and of measuring pore fluid pressures. One of the devices, a uniaxial strain test device, is capable of statically or dynamically testing remolded and undisturbed specimens to a maximum vertical stress of 100 MPa. The other, a triaxial ... |
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| Soil-Cement Study, Truscott Brine Dam, Texas |
AUG 86 |
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| Authors:
Robert H. Denson; Tony Husbands; Olen K. Lloyd; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| Soil-cement was considered as a slope protection material to be used on the Truscott Dam which will impound water having high sulfate and chloride contents (3,000 mg/L and 10,000 mg/L, respectively). Type II and Type V cements, with and without fly ash as a cement replacement, were used to prepare specimens for the following tests; compressive strength, sulfate attack and expansion, wetting-drying, frost damage, and optimum moisture-maximum density. It was ... |
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| Steerability Analysis of Tracked Vehicles: Theory and User's Guide for Computer Program TVSTEER |
AUG 86 |
127 pages |
| Authors:
George Y. Baladi; Donald E. Barnes; Rebecca P. Berger; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report is a user's guide for the computer program TVSTEER, which predicts the steering performance of high-mobility/agility tracked vehicles in environments ranging from very soft soils to hard surfaces. In addition to a listing of the program (Appendix A), the report contains a glossary of the important variable names (Appendix B), typical sets of input and output data, a brief flowchart, and 10 sample runs. Appendix C describes a ... |
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| Strength Design of Reinforced Concrete Hydraulic Structures. Report 4. Load-Moment Characteristics of Reinforced Concrete Circular Conduits |
AUG 86 |
|
| Authors:
Vincent P. Chiarito; Paul F. Mlakar; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| The effect of initial curvature on the trust-moment characteristics of reinforced concrete circular conduit sections was investigated. This study was undertaken since conduit sections built by the Corps of Engineers are often so sharply curved relative to their thicknesses that initial curvature effects might be significant. The effect of initial curvature was investigated through curved beam, Airy stress function, and nonlinear finite element analyses. In addition, three model conduits representative ... |
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| Study of Stored Energy Systems Proposed for Testing a Pressure- Regulating Valve |
JUL 86 |
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| Authors:
James B. Cheek; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| Two systems using stored mechanical energy, rotational and translational (drop), were proposed for use in testing a high discharge, high- pressure-regulating valve. A computer-based dynamic analysis of those systems indicates the drop test system to be less costly, but near the practical limits of drop height and weight. The rotational system will exercise the valve for one-half of a pump cycle provided the pump begins at the start of a ... |
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| Repair, Evaluation, Maintenance, and Rehabilitation Research Program. Latex Admixtures for Portland Cement Concrete and Mortar |
JUL 86 |
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| Authors:
Dennis L. Bean; Tony B. Husbands; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| A latex used as an admixture in portland cement concrete or mortar is a water-emulsion organic polymer. This polymer emulsion will coalesce to form a continuous film within the matrix of the paste and around the aggregate, thus producing greater tensile and flexural strength and a more durable material (because it acts as a moisture barrier to the entry of liquid water but allows water vapor to migrate out). A ... |
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| Blast Analysis and Design of Rocket Engine Test Facility Control Rooms |
JUL 86 |
43 pages |
| Authors:
Richard C. Dove; Sam A. Kiger; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| In support of plans to add a second control room to the Rocket Engine Test Facility at NASA, Cleveland, OH, the existing control room was analyzed to determine the most severe accidental explosion it could safely withstand. This potential accident was used as the design threat to develop a preliminary design for the new control room. The analysis and design calculations were based on procedures from Army TM 5-1300/NAVFAC P-397/AFM ... |
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| Explosive Tests on Reinforced Concrete Walls at Camp Shelby, Mississippi |
JUL 86 |
67 pages |
| Authors:
David R. Coltharp; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| An existing 18-in.-thick reinforced concrete wall was tested using close-in detonations of cased and bare explosive charges. The objectives of the tests were to gather data on the loading of the wall and to determine the difference in wall response between cased and bare charges. Both composition C-4 and TNT explosives were used in the tests. As expected, the results showed the C-4 to be more energetic than the TNT ... |
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| Dynamic Test of a Corrugated Steel Keyworker Blast Shelter |
MAY 86 |
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| Authors:
Stanley C. Woodson; Thomas R. Slawson; Randy L. Holmes; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| At the time this study was initiated, civil defense planning in the United States called for the evacuation of nonessential personnel to safe host areas when a nuclear attack is probable, requiring the construction of blast shelters to protect the key workers remaining in the risk areas. A full-scale corrugated steel Keyworker blast shelter was dynamically tested using the High Explosive Simulation Technique (HEST). The test primarily investigated the structural ... |
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| Tests and Analyses of the Panama Canal Locks Tow Track System |
MAY 86 |
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| Authors:
V. T. Cost; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| The Panama Canal has in recent decades experienced increasingly heavier traffic volume and gross tonnage. These increased demands have contributed to serious structural deterioration of the tow track system used in the locks traffic was devised by Panama Canal Commission (PCC) engineers, and implementation was begun in 1981. Concern arose that the repaired tow track might not be resistant to continued deterioration. An evaluation of the structural integrity of the ... |
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| Variations in Cementitious Media |
MAY 86 |
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| Authors:
Ronald E. Reinhold; Rudolf E. Richter; Alan D. Buck; Katharine Mather; Bryant Mather; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| A total of 59 cements, 12 fly ashes, 19 silica fumes from 16 sources, 3 natural pozzolans, and 1 ground granulated iron blast-furnace slag, and laboratory combinations of these materials were studied by a combination of physical, chemical, and petrographic methods. Creep data were obtained for 17 pastes made using some of these materials. |
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| Development of Freshwater Grout Subsequent to the Bell Canyon Tests (BCT) |
APR 86 |
|
| Authors:
Lillian D. Wakeley; Donald M. Walley; Alan D. Buck; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| Freshwater grouts are among the cement-based materials developed and studied at the US Army Engineer Waterways Experiment Station (WES) for sealing a radioactive waste repository in bedded evaporite rocks. The grout most studied was first developed for the Bell Canyon Tests(BCT) at the Waste Isolation Pilot Project (WIPP) in southeastern New Mexico. This salt-free grout, designated BCT- 1FF, was placed in the field in 1981 (Site and Preliminary Design Validation, ... |
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| Yield Effects on the Response of a Buried Blast Shelter |
APR 86 |
280 pages |
| Authors:
Thomas R. Slawson; Sharon B. Garner; Stanley C. Woodson; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| The Federal Emergency Management Agency has tasked the US Army Engineer Division, Huntsville, to design a Keyworker blast shelter. In conjunction with this project, the US Army Engineer Waterways Experiment Station conducted a series of tests to investigate the effects of variations in weapon yield and the absence of wall stirrups on the structural response of a reinforced concrete box-type shelter. The VSBS computer program was also utilized in these ... |
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| Facilities Technology Application Tests; Concrete Repair |
APR 86 |
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| Authors:
Tony B. Husbands; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| The Office, Chief of Engineers, through the Facilities Technology Application Tests Program, requested that the US Army Engineer Waterways Experiment Station demonstrate some of the latest technology in the use of polymeric systems for repairing concrete. Two sites at Fort Bragg were chosen for repair, a water tower and a multistory building. The six concrete footings around the base of the water tower contained numerous cracks, with some spalling and ... |
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| Effects of Edge Restraint on Slab Behavior |
FEB 86 |
283 pages |
| Authors:
L. K. Guice; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This study was performed in conjunction with a Federal Emergency Management Agency program to plan, design, and construct keyworker blast shelters which would be used in high-risk areas of the country during and after a nuclear attack. The shelters considered in this study were box-type structures in which damage is much more likely to occur in the roof slab than in the walls or floor. In this part of the ... |
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| Epoxy-Resin Grouting of Cracks in Concrete |
DEC 85 |
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| Authors:
Dennis L. Bean; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| Cracked concrete can be successfully repaired by epoxy-resin grouting if it is performed properly, using the correct materials. Epoxy resins can be pressure grouted in cracks of different sizes in concrete at different temperatures, even if the concrete is damp or under water. A literature search was conducted and manufacturers were contacted to obtain the latest information about materials, methodology, and equipment for epoxy-resin grouting. (Author) |
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| Expansive Grout Plug Effects in Restrained Environments |
OCT 85 |
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| Authors:
Carl E. Pace; Charles W. Gulick; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| Technology needs to be developed which can assure the safe storage of hazardous waste material in underground cavities. A large portion of this report is devoted to the pressure-versus-restraint relation of the plugging material. This relation can be determined by using steel pipes to provide known restraints on the plugging material as it expands. The pressure-versus-restraint of the expansive material can be determined from pressures obtained from the fluid pressure ... |
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| Structural Element Tests in Support of the Keyworker Blast Shelter Program |
OCT 85 |
330 pages |
| Authors:
T. R. Slawson; H. M. Taylor Jr.; F. D. Dallriva; S. A. Kiger; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| At the initiation of this study, civil defense planning called for the evacuation of nonessential personnel to safe host areas during a time of crisis, and the construction of shelters to protect the keyworkers remaining behind. The investigation documented in this report will assist the US Army Engineer Division, Huntsville, in designing a 100-man keyworker blast shelter. Six static tests and twelve dynamic tests were conducted on approximately 1/4- scale ... |
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| Creep Test of WIPP (Waste Isolation Pilot Plant) Site Anhydrite Core |
SEP 85 |
|
| Authors:
R. L. Stowe; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| A creep reaction frame, a test specimen deformation jacket, a data acquisition system, and a triaxial chamber were readied and verified for their suitability for conducting triaxial creep tests of hard rock. All the equipment was found to be adequate for doing triaxial creep tests. A limited number of creep tests was conducted on anhydrite rock core from the Waste Isolation Pilot Plant (WIPP) site. Three of the four creep ... |
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| Cementitious Mixtures for Sealing Evaporite and Clastic Rocks in a Radioactive-Waste Repository |
SEP 85 |
|
| Authors:
Lillian D. Wakeley; Della M. Roy; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| Cement-based mixtures were proportioned for sealing a potential geologic repository for high-level radioactive waste in evaporite and related rock strata. The slightly expansive cementitious mixtures were based on Class H portland cement and Class C fly ash, with silica flour and calcium sulfate additives, and a low ratio of water to cementitious solids (w/s = 0.32). Both a salt-free and a salt-containing version were used in tests with anhydrite, siltstone, ... |
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| Distribution of Chloride in a Salt-Saturated Grout in Contact with Rock Salt |
SEP 85 |
|
| Authors:
Lillian D. Wakeley; J. P. Burkes; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| Bond strength of a sodium chloride-saturated grout to rock salt suggested chemical bonding existed across the interface. Chemical analyses using scanning electron microscopy/energy-dispersive X-ray spectroscopy of various locations in the grout showed a significantly greater quantity of chloride near the interface than near the perimeter of specimens. The resultant concentration of chloride is at least partially controlled by the proximity of rock salt. (Author) |
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| Sulfate Resistance of Hydraulic Cements Containing Blast-Furnace Slag |
SEP 85 |
|
| Authors:
Alan D. Buck; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| As part of one US Army Corps of Engineers research program and one American Society for Testing and Materials (ASTM) cooperative program performed in the Concrete Technology Division of the Structures Laboratory of the US Army Engineer Waterways Experiment Station in the 1970's, five portland blast-furnace slag cements were tested for sulfate resistance. The major intent of this program was to develop a new standardized test for determining sulfate resistance ... |
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| Force-Pulse Tests of Tactical Communication Equipment |
SEP 85 |
232 pages |
| Authors:
Roger D. Crowson; Frederick Safford; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| A unique test device as been developed and has been shown to be an effective means of subjecting electronic equipment to biaxial acceleration levels that might be encountered in a battlefield condition. The pulse generator can develop simultaneously a 10,000-lb force vertically and horizontally. Test articles of up to 100 lb have been tested in a rack-mounted system to acceleration levels of 2000 g's. Several mechanical limitations have been identified ... |
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| Development of a Sanded Expansive Salt Grout for Repository Sealing Application |
AUG 85 |
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| Authors:
A. D. Buck; J. A. Boa Jr.; D. M. Walley; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| A sanded version of the basic BCT 1-F expansive salt grout was developed by the US Army Engineer Waterways Experiment Station in early 1983 for use in a test by Terra Tek in the Fall of 1983 in Salt Lake City. This grout is known as TT83. Initial laboratory tests showed this mixture had adequate workability, impermeability, strength, and positive volume change. There were problems with flow when this material ... |
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| Thermal Stability of Certain Hydrated Phases in Systems Made Using Portland Cement |
AUG 85 |
|
| Authors:
A. D. Buck; J. P. Burkes; T. S. Poole; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| As part of the study of hydraulic-cement system for use in possible underground isolation of nuclear wastes, this study was made to determine the temperature stability of ettringite and chloroaluminate. Either or both of these phases may be expected in a hydraulic cement system depending on the presence of salt. (NaCl). The study of ettringite was made using 15 mixtures that contained portland cement, plaster, 2 levels of water, and ... |
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| Development of Two Candidate Concrete Mixtures (Salt, Nonsalt) for Repository Sealing Applications |
AUG 85 |
|
| Authors:
A. D. Buck; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| Two concrete mixtures were developed in 1983 for possible use in nuclear waste repository sealing application. The salt concrete was basically an adaptation of BCT 1-F salt grout made by adding aggregate. The nonsalt mixture was a similar adaptation of nonsalt BCT 1-FF grout. The basic requirement was continued workability after 2 hr of intermittent mixing. Tests of hardened specimens included strength, modulus of elasticity (E), permeability, coefficient of linear ... |
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| Effects of Shear Stirrup Details on Ultimate Capacity and Tensile Membrane Behavior of Reinforced Concrete Slabs |
AUG 85 |
184 pages |
| Authors:
Stanley C. Woodson; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| At the time this study was initiated, civil defense planning in the United States called for the evacuation of nonessential personnel to safe host areas when a nuclear attack is probable, requiring the construction of blasts shelters to protect the keyworkers remaining in the risk areas. The placement of shear stirrups in the one-way reinforced concrete roof slabs of the shelters will contribute significantly to project costs. Ten one-way reinforced ... |
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| Effects of Reinforcement Configuration on Reserve Capacity of Concrete Slabs |
AUG 85 |
117 pages |
| Authors:
S. C. Woodson; S. B. Garner; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| Fifteen one-way reinforced concrete slabs were statically tested under uniform surface pressure either to failure, or to deflections that exceeded 17 to 24 percent of slab clear span. The main objective was to determine principal reinforcement configurations that would enhance tensile membrane behavior at large deflections. Each slab had a clear span of 24 inches and was 2-5/16 inches thick. Grade-60 reinforcement and 4,000-psi concrete were used. The total amount ... |
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| Systems and Materials to Prevent Floodwaters from Entering Buildings |
MAY 85 |
97 pages |
| Authors:
C. E. Pace; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report presents the results of studies of methods and materials to protect homes and other buildings from flood damage. Studies are described that were conducted to (a) determine block-wall integrity, (b) test various sealing materials, (c) test protective systems installed on prototype dwellings, and (d) evaluate various systems currently being using to prevent flood damage to homes and buildings. This study does not attempt to develop detailed solutions to ... |
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| Repair, Evaluation, Maintenance, and Rehabilitation Research Program. The Condition of Corps of Engineers Civil Works Concrete Structures |
APR 85 |
|
| Authors:
J. E. McDonald; R. L. Campbell Sr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| Two computerized data bases, (a) structure-description and (b) damage and repair, were compiled. The structure-description data base contains basic information (location, category, age, purpose, etc.) on 766 projects. The damage and repair data base contains information on the current condition of the concrete in the Corps' civil works structures as determined through detailed reviews of over 2000 periodic inspection reports. To assist in the analysis, a number of computer programs ... |
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| Cement Composition and Concrete Durability in Sea Water |
DEC 84 |
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| Authors:
A. D. Buck; K. Mather; B. Mather; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| The effects of cement composition on durability of concrete in sea water were investigated. The separate and combined effects of alkali-silica reaction and sulfate attack were evaluated both in the laboratory and using concrete specimens from 16 mixtures exposed in warm sea water at St. Augustine, Florida. Three mixtures were made that were susceptible to both alkali-silica reaction and sulfate attack, three that should not manifest either reaction, three susceptible ... |
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| Evaluation of Epoxy Resin Systems as Backing Materials for Miter Gates |
DEC 84 |
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| Authors:
D. L. Bean; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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| This study was conducted because of problems encountered with epoxy resin backing material when used as a filler for setting quoin and miter blocks of lock miter gates. The problems were failure of the epoxy system to set and softening after being submerged in water over a period of time. Laboratory tests were developed to evaluate different epoxy resins when used as a filler for setting quoin and miter blocks ... |
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