Methods for Assessing Wood Structures in Place
The Forest Products Laboratory is developing a comprehensive guideline for assessing the condition of existing wood structures. This paper provides an overview of the current literature...
Applications of X-Ray Imaging in Soil Mechanics
This paper presents a summary of the principles of methods to observe the detailed patterns of local deformation within a soil mass: stereophotogrammetry, polaroscopy, infrared tomography...
Development of a Plane-Strain Device for Soft Rock
Work is now in progress to build a plane-strain apparatus for 'soft' (unconfined compressive strenghts below 35 MPa) rock and concrete, based upon a passive,...
Combined Compression-Shear Experiments on Mortar-Aggregate Interfaces
Material interfaces between matrix and aggregate particles in cementitious composites such as concrete are considered to be a very important component of the material microstructure, which...
Use of Geogrids on Soft Deposits
The construction of highway embankments over soft and waste deposits required the use of geogrids as an economical alternate to conventional methods of 'remove and replace'....
A Microplane Constitutive Model for Soils
A microplane model for the inelastic behavior of soils is presented. The microscopic constitutive equations are defined independentely for a set of microplanes covering all possible orientations,...
Rate Effects on Fracture of Concrete
An analytical and experimental investigation of mode I (tensile and mixed mode (combined tensile and shear) fracture of concrete subjected to impact loading was conducted. The rate of...
Creep of Polycrystalline Ice
This paper discusses the extension of creep models for polycrystalline ice to include the effects of a non-monotonic loading history. Attention is focussed on cyclic loading since it is...
Improved Prediction of Masonry Durability Through Advanced Materials Science Methods
Several trends in the use of materials in civil engineering have made it imperative to improve the ability to predict the durability of masonry. This will require more emphasis on materials...
Use of Voluntary Consensus Standards by the Bureau of Reclamation
This paper outlines how the Bureau of Reclamation has historically participated in standards development for emerging technologies, and how present standards are applied or adapted for...
Asphalt Cement Specifications and HMA Performance
The standard specifications generally used for hot mix asphalt (HMA) are those published by the American Society for Testing and Materials (ASTM) or the American Association of State Highway...
Are ASTM Standards Enough?
ASTM (American Society for Testing and Materials) is most likely the World's most renown developer of voluntary consensus standards. Its standards development process utilizes...
Design of a Lined Landfill on Compressible Clays
In mid-August, 1989, a 500,000m3 landslide occurred at a commercially operated landfill in central Maine. The landslide material consisted of municipal...
Fiber Reinforced Plastic Grids for the Structural Reinforcement of Concrete
The use of fibre resin plastic grid is investigated as a primary bending reinforcement in concrete members. Laboratory bending data is compared with theoretical results using ACI 318-83...
Spectral Techniques for Serviceability and Durability Assessment of High-Performance Construction Materials
Using spectral techniques, one can obtain the frequency content of a material specimen. Spectral measurements were made on specimens of Portland cement and a polymer based materials. In...
Durability of Fly Ash Concrete in the Marine Environment
This paper presents the experimental investigation of durability of air-entrained fly ash concrete in the marine environment. The findings indicate that the deterioration rate of durability...
Effect of Fly Ash on the Microstructure and Durability of Concrete
The influence of fly ash on the microstructure and durability of concrete was investigated. It was found that the use of 50% fly ash in concrete reduced greatly its resistance to freezing-and-thawing...
Permeability Effects on the Sulfate Resistance of Concrete
A laboratory study was conducted to determine the effect of permeability on the sulfate resistance of concrete containing fly ash. Concrete specimens were moist cured for 7 and 100 days...
High Performance Fiber Reinforced Cement-Based Composites
Fracture of cement-based composites reinforced by the relative high fiber volume is studied. Crack propagation and damage distribution were examined by laser holographic interferometry....
Material Properties Related to Pavement Performance
As part of the Strategic Highway Research Program, an effort has been made to review research literature which can be used to relate asphalt properties to pavement performance. This report...
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