| Procedures for the Evaluation of Sheet Membrane Waterproofing |
AUG 1999 |
69 pages |
| Authors:
Charles J. Korhonen; James S. Buska; Edel R. Cortez; Alan R. Greatorex; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
 | Sheet membrane waterproofing has been used to protect bridge decks against water and deicing salts by transportation agencies in New England for more than two decades. Though such membranes have proven useful at extending the useful life of bridge decks, there are no convenient methods to evaluate one membrane against another. This report details the genesis of blisters, a major problem for membranes, and defines test procedures to evaluate sheet ... |
|
| Creative Design Methods and Investigation of Cellulose Fiber Transport and Application |
22 JUL 1999 |
169 pages |
| Authors:
Mack-Jan H. Spencer; MARYLAND UNIV COLLEGE PARK DEPT OF MECHANICAL ENGINEERING
|
| Many difficult design problems require the development of creative design solutions to achieve feasible results. Designers and engineers have searched for methods to enhance creativity in problem-solving to acquire new ideas. A creative design method is a process by which new, independent ideas are generated using knowledge to solve some problem or achieve an objective. Four prominent creative design methods were investigated to explore the extent to which they actually ... |
|
| Field Demonstration of Biodegradable Hydraulic Fluid in Military Tactical and Construction Equipment |
JUL 1999 |
40 pages |
| Authors:
B. R. Wright; R. A. Alvarez; G. Phillios; In S. Rhee; SOUTHWEST RESEARCH INST SAN ANTONIO TXTARDEC FUELS AND LUBRICANTS RESEARCH FACILITY
|
| The U.S. Army is currently using four different types of hydraulic fluids/oils. The MIL-H-6083 and MIL-H-461 70 are used for Armor vehicles, while MIL-L-21 04 (1OW) is used for construction equipment or other applications and MIL-46001 is used for industrial hydraulic systems. As a part of the development of the biodegradable hydraulic fluid program, a field demonstration was conducted at Ft. Bliss, TX for one year using military tactical and ... |
|
| Dynamic Strength Enhancement of Conventional Concrete |
30 JUN 1999 |
23 pages |
| Authors:
H. D. Kang; Y. S. Roh; K. J. Willam; Y. Xi; COLORADO UNIV AT BOULDER DEPT OF CIVIL ENVIRONMENTAL AND ARCHITECTURAL ENGINEERING
|
| In order to investigate the performance of conventional concrete at different loading rates, experimental results of strength enhancement were obtained under tension and compression tested under different loading speeds. G- mix specimens prepared at the Tyndall Air Force Base were used to determine the range of loading rates of the servo-hydraulic equipment at hand and to obtain experimental results with a series of indirect tension and uniaxial compression tests. For ... |
|
| An Evaluation of Equipment and Procedures for Tensile Bond Testing of Concrete Repairs |
JUN 1999 |
86 pages |
| Authors:
Alexander M. Vayburd; James E. McDonald; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| If the durability of repaired concrete structures is a primary objective of any repair project, then every effort should be made to ensure adequate bonding between the repair and the existing concrete substrate. A total of 257 partial-depth cores in 77 experimental repairs were tested in Florida, Illinois, and Arizona in order to evaluate the effect of material properties and environmental conditions on the bond between repair and concrete substrate. ... |
|
| A Two-Dimensional Laser Interferometer System for Dynamic Response Characterization |
30 MAY 1999 |
16 pages |
| Authors:
Min Zhou; GEORGIA INST OF TECH ATLANTA SCHOOL OFMECHANICAL ENGINEERING
|
| The objective of this AFOSR DURIP (Defense University Research Instrumentation Program) grant was to establish experimental capabilities for quantifying material responses under highly dynamic conditions. The parent grantwith which this grant is associated is entitled "Time-Resolved Analysis of the Dynamic Behavior of Granular Materials". The capabilities have been established and have been used in the research. A state-of-the-art laser interferometer system has been acquired to allow simultaneous measurement of surface ... |
|
| Compressive Membrane Capability Estimates in Laterally Edge Restrained Reinforced Concrete One-Way Slabs |
MAY 1999 |
446 pages |
| Authors:
Ronald W. Welch; William J. Hall; William L. Gamble; ILLINOIS UNIV AT URBANA DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING
|
| The load capacity of laterally restrained reinforced concrete one-way slabs currently is estimated by entering the compressive membrane theory with a midspan deflection. However, the midspan deflection estimates exhibit large variability. The point of peak thrust is a more accurate index of the peak load capacity, than midspan deflection estimates and even experimentally measured midspan deflections. The calculation of the thrust within the compressive membrane theory is a maximum when ... |
|
| Schulsystem und Minderheitenpolitik in Rheinland-Pfalz und im Saarland (School Systems and Minority Policy in Rheinland-Pfalz and Saarland) |
MAY 1999 |
122 pages |
| Authors:
Beatrix Palt; Lutz R. Reuter; UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY F R) FACHBEREICH PAEDAGOGIK
|
| Two-thirds of the study pertains to Saarland, the first third to Rheinland Pfalz. Research was concluded on the following subjects: the construction of the school system; the types of schools and the number of pupils; the number, origin, and differentiation of minorities, who come mostly from Turkey, but also from Italy, Greece, Portugal, and the former Yugoslavia, Africa, and Asia; school organizations especially designed for minority groups both of German ... |
|
| Granular Materials Studied By MRI |
APR 1999 |
4 pages |
| Authors:
Eiichi Fukushima; Dean O. Kuethe; LOVELACE INSTITUTES ALBUQUERQUE NM
|
| This letter supplements the final report of August 1998 on Additional |
|
| Discrete Fiber Reinforcement of Sands for Expedient Road Construction |
MAR 1999 |
107 pages |
| Authors:
Jeb S. Tingle; Steve L. Webster; Rosa L. Santoni; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| This report describes laboratory and field experiments conducted using discrete synthetic fibers to stabilize sands for expedient road construction. Unconfined compression tests were conducted as an index of material performance to identify the effects of fiber type, length, content, denier, and sand type on load-bearing capacity. Field sections consisting of 8- in. fiber-stabilized layers over a sand subgrade (SP) were constructed and trafficked to validate the laboratory results under actual ... |
|
| Performance Criteria for Concrete Repair Materials, Phase II Summary Report |
MAR 1999 |
74 pages |
| Authors:
James E. McDonald; Alexander M. Vaysburd; Peter H. Emmons; Randall W. Poston; Keith E. Kesner; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| The results of a study to develop performance criteria for cement- based repair materials are summarized herein. Results of laboratory tests and field performance studies were correlated and guidance for selection of repair materials that would reduce the risk of premature failures was developed. This guidance includes a standard protocol for repair material data sheets and proposed performance criteria. Results of this study illustrate the significant effect of drying shrinkage ... |
|
| Engineering and Design: Project Geotechnical and Concrete Materials Completion Report for Major USACE Projects |
22 FEB 1999 |
22 pages |
| Authors:
CORPS OF ENGINEERS WASHINGTON DC
|
| The purpose of this regulation is to establish the requirement for documenting, as part of the permanent project record, the as-constructed geotechnical and concrete materials aspects of all major, complex and unique engineered projects constructed by USACE. Major construction projects are those that fall in the category of multi-million dollar, multi-purpose projects including all embankment and concrete dams and their appurtenant structures, and/or any structure for Civil Works projects involving ... |
|
| Studies of Fracture Processes in Cement-Based Materials under Compression with Microtomography and Computer Vision |
14 FEB 1999 |
10 pages |
| Authors:
Eric N. Landis; Surendra P. Shah; MAINE UNIV AT ORONO DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING
|
| The primary objective of this research program was to provide experimental data to feed into the extensive modeling work of the AFOSR Shock Physics program. Two advanced complimentary experimental techniques were used: x-ray microtomography (XMT) and digital image correlation (DIC) . The former is a three dimensional technique that is restricted to small specimens under static loading, while the latter is a surface-only technique that can be applied in a ... |
|
| Mechanical Behavior of Granular/Particulate Media Reinforced with Fibers |
FEB 1999 |
7 pages |
| Authors:
Radoslw Michalowski; JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF CIVIL ENGINEERING
|
| Fiber-reinforced ganular composites (for instance, fiber-reinforced sand) are considered as construction materials for such applications as subgrades of airfields and roads, aircraft parking facilities, etc. An investigation into the mechanical behavior of granular/particulate media with fibrous inclusions was carried out. This investigation was built on the results of a previous study. Fiber-reinforced granular material was considered as a composite, and a mathematical homogenization scheme ... |
|
| Evaluating a Protocol for Testing a Fire Resistant Oil Spill ContainmentBoom |
FEB 1999 |
42 pages |
| Authors:
Kenneth R. Bitting; COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT
|
| Most response plans for in-situ burning of oil at sea call for the use of a fire-resistant boom to contain the oil during a burn. Presently, there is no standard method for the user of fire-resistant booms to evaluate the anticipated performance of different booms. The ASTM F-20 Committee has developed a draft standard, "Standard Ouide for In-Situ Burning of Oil Spills OnWater: Fire-Resistant Containment Boom," however, the draft provides ... |
|
| Characterization of Low Temperature Cracking Potential for Westrack Paving Materials |
20 JAN 1999 |
190 pages |
| Authors:
Thomas J. Walker; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| A large portion of the paved highways in the United States are located in regions which experience freezing temperatures. It is well known that under extremely cold temperatures asphalt concrete pavements will undergo thermal stresses sometimes resulting in thermal cracking. An asphalt pavement that has developed thermal cracks in its wearing surface will experience a reduction in service life precipitating higher maintenance and rehabilitation costs. ... |
|
| Engineering and Design: Compilation of Concrete Aggregate and Stone RIPRAP Test Data |
01 JAN 1999 |
7 pages |
| Authors:
CORPS OF ENGINEERS WASHINGTON DC
|
| This regulation prescribes the procedures for the continuing compilation and distribution of test data on concrete aggregates and stone riprap from sources within the continental United States and Alaska. |
|
| Developing a Handbook for Construction Equipment Management and Implementation |
1999 |
|
| Authors:
Russell V. Seignious; FLORIDA UNIV GAINESVILLE DEPT OF CIVILENGINEERING
|
 | Construction equipment may constitute one of the single largest long term capital investments for a contractor. This is particularly true for those contractors engaged primarily in horizontal construction. Regardless of the type of construction, the goal of successful construction management is to complete projects in accordance with plans and specifications, on time, within budget, and at the least possible cost. A crucial element in accomplishing the aforementioned goal is the ... |
|
| Bond Variability of Glass-Fiber-Reinforcing-Plastic Reinforcement in Concrete |
DEC 1998 |
414 pages |
| Authors:
Joseph P. Hanus; MINNESOTA UNIV MINNEAPOLIS
|
| This report summarizes an experimental program that investigated the bond variability of glass-fiber-reinforced-polymer (GFRP) reinforcement in concrete. The variables in the study were manufacturer (Marshall Industries Composites, Inc. M1 and Corrosion Proof Products/Hughes Brothers M2), bar size (No. 5 and 6), cover (2 and 3 bar diameters), and embedment length (10 through 47 in.). Tensile tests were also performed on the GFRP rebar for comparison to bond tests that exhibited ... |
|
| Dynamic Deformation Capacity of Reinforced Concrete. Phase 5: Influence of Lacing Reinforcement |
DEC 1998 |
|
| Authors:
J. C. Van Doormaal; S. Caron; PRINS MAURITS LABORATORIUM TNO RIJSWIJK(NETHERLANDS)
|
| On behalf of MOD-NL/DWOO/HWO-CO blast tests were performed on simply supported reinforced concrete slabs. The resistance-deformation curves of the slabs were determined. From these curves, the deformation capacity of the slabs has been read. It was observed that the diameter of the longitudinal reinforcement has a considerable influence on the deformation capacity of the slabs and that it can change the failure mode. Concerning lacing, it was observed that it ... |
|
| Non-Ductile Behavior of Reinforced Concrete Frames With Masonry Infill Panels Subjected to In-Plane Loading |
DEC 1998 |
278 pages |
| Authors:
Ghassan Al-Chaar; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
|
| Lessons learned from earthquakes in the last 50 years have spurred changes in building seismic code requirements, making it necessary to determine the seismic vulnerability of old military structures. This study addresses a popular type of building in high seismic zones that has lateral load-resisting systems constructed from reinforced concrete (R/C) frames with masonry infill panels. An experimental program was carried out to evaluate this ... |
|
| Moisture in the Roofs of Cold Storage Buildings |
NOV 1998 |
43 pages |
| Authors:
Wayne Tobiasson; Alan Greatorex; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| The low-slope roofs of 10 cold storage buildings in the Dallas area were examined visually and thermographically from above and below. Cores were taken to verify infrared findings, and 12- x 12-in. (30- x 30-cm) specimens of many of the insulations were removed for laboratory studies of their thermal properties. Insulations included fibrous glass, fiberboard, perlite, wood fiber, expanded and extruded polystyrene, isocyanurate, and phenolic. Areas of wet insulation were ... |
|
| Preparation of Portland Cement Components by PVA Solution Polymerization |
OCT 1998 |
22 pages |
| Authors:
Elizabeth A. Benson; S. J. Lee; W. M. Kriven; ILLINOIS UNIV AT URBANA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The four components of Portland cement: dicalcium silicate, C2S (Ca2SiO4), tricalcium silicate, C3S (Ca3SiO5), tricalcium aluminate, C3A (ca3Al2O6), and tetracalcium aluminate iron oxide, C4AF (Ca4Al2Fe3O10), were formed using a solution-polymerization route based on polyvinyl alcohol (PVA) as the polymer carrier. The powders were characterized using X-ray diffraction techniques, BET specific surface area, and scanning electron microscopy. This method produced relatively pure, synthetic cement components of sub-micron or nanometer crystallite dimensions, ... |
|
| Engineering and Design: Cement, Slag, and Pozzolan Acceptance Testing |
30 SEP 1998 |
16 pages |
| Authors:
CORPS OF ENGINEERS WASHINGTON DC
|
| This regulation sets forth policy and responsibilities for acceptance testing of cementitious materials including portland cement, blended cement, pozzolan, and ground granulated blast-furnace slag (hereinafter referred to as slag). |
|
| Alignment Lifting Fixture. |
11 SEP 1998 |
18 pages |
| Authors:
John J. Vaillancourt; Steven L. Camara; Daniel W. French; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An aligning and lifting device is disclosed. The invention may be for use with an underwater cage including a top portion and a bottom portion. The aligning and lifting device includes a male member having a support surface fixed to the top portion of the cage, an integrally formed wedge shaped portion depending from the support surface for lateral alignment capabilities, and an alignment pin projecting from the distal end ... |
|
| Performance of Electric and Microwave Batch Plant Moisture Meters in Determining the Moisture Contents of Fine-Aggregate Materials for Concrete Production |
SEP 1998 |
42 pages |
| Authors:
Willie E. McDonald; Toy S. Poole; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| The investigation described in this report evaluated the accuracy of four moisture meters to consistently measure fine-aggregate moisture contents and to evaluate the operational features of the instruments. No data were developed in this investigation that would indicate that any of the four commercial devices studied was superior to others or would be incapable of supplying adequate information upon which to base control of surface ... |
|
| Innovative Methods for Levee Rehabilitation |
SEP 1998 |
141 pages |
| Authors:
Edward B. Perry; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| The Corps of Engineers is responsible for 8,500 miles of levees. Levees are subject to overtopping, current and wave attack, surface erosion due to rainfall, through-seepage, underseepage, and slope instability. Conventional methods of levee rehabilitation are both costly and time consuming. Research is underway to develop new methods of levee rehabilitation. This report covers analytical studies on two-dimensional slope stability analysis of geogrid mechanically ... |
|
| User's Software Manual for Inspection and Rating of Concrete in Gravity Dams, Retaining Walls, and Spillways |
SEP 1998 |
65 pages |
| Authors:
Stuart D. Foltz; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
|
| The U.S. Army Corps of Engineers operates approximately 270 navigation dams constructed of plain or reinforced concrete. The Corps also operates more than 350 reservoir dams, most of which are either concrete gravity structures or embankment structures with attachments and appurtenances constructed of plain or reinforced concrete. Many of these structures will require significant repairs to ensure safe and efficient operations. Modem engineering technology provides procedures for performing condition surveys, ... |
|
| Unique Polymeric Fiber and Fiber Delivery Systems for the Economic Preparation of High-Fiber Content Concrete with Superior Physical Properties |
SEP 1998 |
242 pages |
| Authors:
Billy D. Neeley; Donna C. Day; James E. Shoenberger; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report documents the results from an investigation of a new polymer fiber and unique delivery system for charging fibers into concrete mixtures. The straight Polyolefin fibers are available in two sizes: (1) 0.63 mm in diameter and 50 mm long, and (2) 0.38 mm in diameter and 25 mm long. Each of the two sizes of fibers is packaged in bundles approximately 50 mm in diameter. Each. bundle is ... |
|
| Investigations of Plastic Composite Materials for Highway Safety Structures |
AUG 1998 |
82 pages |
| Authors:
Piyush K. Dutta; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| This report presents a basic overview and assessment of different concepts and technologies of using polymer composites in structures generally used for highway safety. The structural systems included a highway barrier guardrail with its posts and blockouts, sign posts, concrete reinforcing rebars, breakaway couplers, and crushable plastic cushions to protect errant drivers from roadside sign and utility posts, and small trees. The composites included fiber ... |
|
| A Building System Based on Foamed Concrete Cast Between Stay-in-Place Cement-Board Forms |
AUG 1998 |
58 pages |
| Authors:
Philip G. Malone; William N. Brabston; Joe G. Tom; Roger H. Jones Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| In January 1995 a Construction Productivity Advancement Research (CPAR) program agreement between Materials Technology Ltd. (MTL), Reno, NV, and the U.S. Army Engineer Waterways Experiment Station (WES) was initiated. The purpose was to develop a new system of building walls for residential and light- utility buildings. The new approach used stay-in-place, fiber-reinforced cement- board forms with foamed or cellular concrete cast between the forms. An immediate ... |
|
| Reactive Powder Concrete for Producing Sewer, Culvert, and Pressure Pipes |
AUG 1998 |
88 pages |
| Authors:
Roy L. Campbell; Edward F. O'Neil; William M. Dowd; Christophe E. Dauriac; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| This report documents research to develop and demonstrate the technical and economic viability of reactive powder concrete (RPC) a very high strength, high performance concrete material for producing precast sewer/culvert and pressure pipes with the ultimate program goals of gaining construction industry acceptance and implementing wide scale commercial fabrication of these products. By optimizing the design of the precast RPC pipes, it was projected that ... |
|
| Impact of Incentives On Project Performance |
AUG 1998 |
129 pages |
| Authors:
Jayson D. Mitchell; TEXAS UNIV AT AUSTIN
|
| Aligning both owner and contractor objectives is widely thought to be a catalyst for better project performance. For this very reason, contract incentives are employed in order to identify and ensure focus on the owner's goals. The scope of this report is to research the extent of use and consequent effects of construction contract incentives offered by owners. The relative use by owners of construction phase ... |
|
| Estimating Bearing Capacity of Piles Installed with Vibratory Drivers |
JUL 1998 |
127 pages |
| Authors:
Peter J. Bosscher; Eva Menclova; Jeffrey S. Russel; Ronald E. Wahl; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| Vibratory pile drivers are sometimes used to install sheet-pile walls, nonbearing piles, and some load-bearing structural piles. In comparison to the more commonly used impact hammers, vibratory drivers offer several advantages: (a) require less energy, (b) have higher rates of penetration of cohesionless soil, (c) produce less noise, and (d) result in less damage to the pile during driving. Presently, there are no reliable methods ... |
|
| Methods of Preparing Horizontal Construction Joints in Mass Concrete. Report 2 - Minimizing Laitance |
JUL 1998 |
49 pages |
| Authors:
Billy D. Neeley; Toy S. Poole; Charles A. Weiss Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report presents the results of a research program examining the effects of different methods of preparing horizontal construction joints in mass concrete construction. The purpose of the research program was to confirm existing guidance or, if necessary, update it. This is the second and final report. The joint moisture conditions at the time of concrete placement were: (a) continuously moist, (b) dry, and (c) dry ... |
|
| Preliminary Analytical Model for Flexible Pavement |
JUL 1998 |
65 pages |
| Authors:
Larry M. Bryant; APPLIED RESEARCH ASSOCIATES INC VICKSBURG MS SOUTHERN DIV
|
| This report documents the first step in development of a preliminary analytical model for flexible pavement analysis for the Airfields and Pavements Division (APD), Geotechnical Laboratory, U.S. Army Engineer Waterways Experiment Station. This first step may be generally described as development of a linear elastic finite element model that reasonably compares with the empirical and/or layered elastic solutions in current use. This report does not attempt ... |
|
| A Portable, Nondestructive Evaluation System |
JUN 1998 |
57 pages |
| Authors:
Fu-Chiarng Chen; Weng C. Chew; A. M. Alexander; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This project was a cooperative effort between the U.S. Army Engineer Waterways Experiment Station (WES) and the University of Illinois under a Cooperative Research and Development Agreement as part of the Construction Productivity Advancement Research Program. The purpose was to develop a portable radar system for nondestructive evaluation (NDE) of concrete. Two approaches, a time-domain pulse system and a frequency-domain system, were investigated. An ultra-wideband ... |
|
| A Statistical Analysis Of Construction Equipment Repair Costs Using Field Data & The Cumulative Cost Model |
28 APR 1998 |
269 pages |
| Authors:
Zane W. Mitchell Jr; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| The management of heavy construction equipment is a difficult task. Equipment managers are often called upon to make complex economic decisions involving the machines in their charge. These decisions include those concerning acquisitions, maintenance, repairs, rebuilds, replacements, and retirements. The equipment manager must also be able to forecast internal rental rates for their machinery. Repair and maintenance expenditures can have significant impacts on these economic decisions and forecasts. The purpose ... |
|
| Performance Criteria for Concrete Repair Materials, Phase II Laboratory Results |
APR 1998 |
301 pages |
| Authors:
Randall W. Poston; Keith E. Kesner; Peter H. Emmons; Alexander M. Vaysburd; STRUCTURAL PRESERVATION SYSTEMS INC BALTIMORE MD
|
| The study reported herein is part of an overall investigation to develop performance criteria for cement-based repair materials. In Phase I of the study, preliminary criteria for dimensionally compatible repair materials were developed based on a review of the literature. This review concentrated on identifying pertinent material properties, appropriate test methods, and demonstrated field performance. Laboratory and field tests to evaluate the preliminary performance criteria were conducted in Phase II ... |
|
| Investigation of Active Tagged Composites for Army Infrastructure Applications |
APR 1998 |
192 pages |
| Authors:
J. B. Berman; Z. Chaudhry; V. Giurgiutiu; R. F. Quattrone; C. A. Rogers; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
|
| Deterioration of reinforced concrete structures due to corrosion of the reinforcing steel is a very expensive infrastructure decay problem. Advanced composites, such as fiber-reinforced plastics (FRP), can eliminate many problems related to steel reinforcement because of their excellent fatigue resistance, corrosion resistance, and their very high specific strength. Acceptance of composites in retrofit applications and new construction creates the need for in-service monitoring techniques to ensure material performance and serviceability, ... |
|
| Conveyor Safety Tray. |
17 FEB 1998 |
|
| Authors:
Francis M. Mulhern; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The forks of a conveyor tray are hingedly mounted between two end forks rigidly interconnected by a cross-bar and through which electrically powered drive chains impart movement to the tray along a vertical conveyor path. The hingedly mounted tray forks are releasably held in normal load-supporting positions on the cross-bar in alignment with the two end forks, so that they may be pivotally displaced upwardly from such positions by travel ... |
|
| Department of the Army: FY 1999 Amended Budget Estimates, Army National Guard, Military Construction Program FY 1999, Justification Data Submission to Congress |
FEB 1998 |
64 pages |
| Authors:
DEPARTMENT OF THE ARMY WASHINGTON DC
|
| This document contains State List of Projects, Mission Listing, Language, Program and Finance Schedule, Object Classification Schedule, Special Program Considerations, Future Years Defense Plan Audit Trial, Project Justification Documents, Planning and Design Justification Document, and Minor Construction Justification Document. |
|
| Effects of Strain Rate and Moisture on the Tensile Strength of Heterogeneous Materials |
FEB 1998 |
50 pages |
| Authors:
C. A. Ross; FLORIDA UNIV SHALIMAR GRADUATE ENGINEERING AND RESEARCH CENTER
|
| Strain rate effects on tensile strength of concrete and mortar were investigated using three different size specimens, two different sized split Hopkinson pressure bars (SHPB) and a standard material test machine. All combinations of data show the same trend of abrupt increases in tensile strength at a strain rate of about 1.0/sec. An analytical expression end an empirical relation for concrete tensile strength are presented as ... |
|
| Particulate Systems with Viscous and Viscoelastic Cement: From Contact Laws to Macroscopic Behavior |
12 JAN 98 |
36 pages |
| Authors:
Jack Dvorkin; STANFORD UNIV CA DEPT OF GEOPHYSICS
|
| The overall objective of the proposed research was to provide a quantitative description of the microstructural, as well as macroscopic mechanical behavior of particulate materials with viscous and viscoelastic intergranular cement. By cement, a material is meant which fills the space between two or more particles at their contacts. The volumetric content of cement in the pore space of an aggregate may vary from zero to 100%. This objective was ... |
|
| Quantification of Shape, Angularity, and Surface Texture of Base Course Materials |
JAN 98 |
29 pages |
| Authors:
Vincent Janoo; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| A state-of-the-art review was conducted to determine existing test methods for characterizing the shape, angularity, and surface texture of coarse aggregates. The review found direct methods used by geologists to determine these characteristics. These methods involve physical measurements of individual aggregates and are very laborious and time consuming. Engineers have developed index tests (indirect methods) to quantify the combined effect of the shape, angularity, and surface texture of coarse aggregates ... |
|
| Demonstration of Advanced Composite Cables for Prestressing Applications in Concrete Waterfront Structures |
JAN 1998 |
105 pages |
| Authors:
Srinivasa L. Iyer; Richard G. Lampo; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
|
| Corrosion of steel reinforced concrete in waterfront structures is a serious and costly infrastructure problem. Advanced composite materials such as glass fiber reinforced polymers (CFRP) and carbon fiber reinforced polymers (CFRP) do not corrode, and are attractive potential replacements for steel reinforcement and prestressing materials. The objective of this research was to demonstrate the satisfactory performance and overall economy of using advanced composites as prestressing cables in concrete construction for ... |
|
| Investigation of Concrete from 1-20 Near Monroe, Louisiana |
JAN 1998 |
79 pages |
| Authors:
G. S. Wong; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report covers an investigation conducted in l994-1995 to determine the probable cause of concrete pavement deterioration in certain lanes of I-20 east and west of Monroe, LA. The investigation was conducted by the U.S. Army Corps of Engineers Waterways Experiment Station at the request of the Louisiana Department of Transportation. Cores taken from distressed and non- distressed areas from different sections of the roadway were evaluated ... |
|
| Designer and Constructor Practices to Ensure Life Cycle Performance |
1998 |
91 pages |
| Authors:
Joelle L. Shelton; UNIV OF WASHINGTON SEATTLE DEPT OF CIVIL ENGINEERING
|
| Technology advances of the last few decades, in such areas as computing and construction materials, have inspired many attempts to improve the construction process. Many of these attempts focus on reducing costs and improving functionality, such as life cycle cost analysis and value engineering, while others, such as design-build, focus on specific phases of the life cycle. Other factors such as declining productivity, the quantity of construction ... |
|
| The Impact of the Small Projects Team Initiative on Construction Projects Managed by the U.S. Army Corps of Engineers |
1998 |
79 pages |
| Authors:
Anthony G. Reed; UNIV OF WASHINGTON SEATTLE
|
| This thesis presents an analysis of the effectiveness of the Small Projects Team Initiative (SPTI) that was developed and implemented by the Seattle District of the U.S. Army Corps of Engineers (USACE). Commonly, there are minimum design costs associated with all construction projects regardless of their size, complexity, or simplicity. Consequently, the design costs are a higher percentage of the overall costs for less expensive projects. SPTI is intended to ... |
|
| Construction Industry Digest |
1998 |
105 pages |
| Authors:
DEPARTMENT OF LABOR WASHINGTON DC OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION
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| The Construction Industry safety and health standards contained in this booklet are to aid employers, supervisors, and safety and health personnel in their efforts toward achieving compliance with OSHA standards in the workplace. Although the digest does not contain all OSHA Construction Industry safety and health standards, those presented are (1) standards most frequently overlooked by the employer, and (2) standards covering particularly hazardous situations. The standards are presented alphabetically ... |
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Construction Equipment, Materials & Supplies
