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Unusual Spacecraft Materials
For particularly innovative space exploration missions, unusual requirements are levied on the structural components of the spacecraft. In many cases, the preferred solution is the utilization...

Morris Sheppard Dam: A Rational Approach to Stability Analysis
This paper details the excessive foundation piezometric conditions found during a routine five-year inspection, and presents the results of backfigured stability analysis of a critical...

Oilcrete
Threatened by probable tightening of hazardous-waste legislation, oil companies are searching for ways to dispose of or stabilize oil-drilling byproducts. One way is cementitious stabilization...

An Integrated GIS and Model for Assisting the Managers of an Army Training Area
The ARC/INFO geographic information system (GIS) has been combined with the ARX spatial expert system and the SMSP soil moisture-soil strength model to assist the managers of a major training...

Stream Bank Stability Prediction for C6 Stream Type Reconstruction
A hydraulic model investigation will be conducted to evaluate the effects of root system characteristics of three meadow plant communities on simulated bank erosion. The test will determine...

Rheological Analysis of Fine-Grained Natural Debris-Flow Material
Experiments were conducted on large samples of fine-grained material (?2mm) from a natural debris flow using a wide-gap concentric-cylinder viscometer. The rheological behavior of this...

Unsteady Flow of Bingham Viscoplastic Material in an Open Channel
An analytic solution for transient flow of a Bingham viscoplastic material in an open channel is presented. The solution for the response to a time-varying pressure gradient predicts shear...

Landfill Liner Quality
Landfill liners are being made with new synthetic materials, materials which may be beyond the knowledge of the engineer in charge of the landfill construction project. Engineers need...

Availability of Portland Cement
A general description of economic, technical, and environmental factors that affect the types of portland cement available is presented. Economic factors have had a major effect on balance...

Comparative Evaluation of 4-Inch and 6-Inch Diameter Specimens for Testing Large Stone Asphalt Mixes
Modified Marshall equipment and Gyratory Testing Machine (GTM) are now available for compacting and testing 6-inch diameter specimens to accommodate aggregate up to 2-inch maximum size....

Wood Variability Effects in Structural Assessment
Engineers evaluating the load carrying capacities of in-service wood structures commonly determine the strength and stiffness properties of structural wood members by various assessment...

Bond Strength of Epoxy-Coated Reinforcement to Concrete?An Update
The results of a large-scale study to determine the effect of epoxy coating on bond strength is described. The study addresses the effects of coating thickness, deformation pattern, bar...

A Materials Study of Interleaved Bismaleimide Composites
One approach for improving damage tolerance in epoxy based composites involves interleafing of tough adhesive layers between plies of the composite prior to fabrication. Extension of this...

Long-Term Strength Gain or High Strength Concrete as Monitored by Drilled Cores
An evaluation was made of the relationship between standard cylinders, four-inch by eight-inch cylinders, and drilled cores. The evaluation results showed that the strengths obtained from...

Heat Development and In-Situ Strength of Large Diameter Caissons Made with High-Strength Concrete
The test program essentially consisted of casting two prototype caissons using two different high-strength concretes, measuring internal caisson and adjacent soil temperatures, extracting...

Evaluation of Factors Affecting High-Strength Concrete Cores
A number of factors are discussed to explain different effects they have on core strength. These factors should be considered when evaluating cores tested to determine 'true'...

Compressive Strength Relationship Between Cylinder Tests and Core Tests
A core obtained from any field cured structural member will be inherently different than the field cured cylinder used as a control. Consequently, comparisons with field cured cylinders...

Maturity and Pullout for High-Strength Concrete
As with other types of concrete mixtures, construction with high-strength concrete requires assurance that sufficient levels of in-place strength are reached at specific times. An experimental...

Laboratory Aging of Asphalt-Aggregate Mixtures
Aging may result in hardening (stiffening) of the mixture which will result in a change in performance of the mixture. This may be beneficial since a stiffer mixture will have improved...

Field Installation of Strain Gaged Geotextiles
High-strength polyester geotextiles were used in two major Corps of Engineers projects: Wilmington Harbor, Del. and New Bedford, Mass. To verify design assumptions and as part of monitoring...

 

 

 

 

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