Experimental Techniques to Study the Microstructure of Cement-Based Materials
Techniques to identify phases and changes in microstructure within cement paste, mortar, and concrete using a scanning electron microscope and image analysis system are described. Backscattered...

Studies of the Interfacial Properties of Fiber Reinforced Cement
The multiple fiber pull-out tests were conducted with steel wires and alkali resistant glass fiber strand in order to characterize the behavior of interface of fiber and cementitious matrix....

Simulation of Failure Processes in Cementitious Particle Composites
Progressive failure analysis in cementitious particle composites such as concrete requires a realistic description of the topology of the composite structure and the interaction of the...

Mechanical Behavior of Composites with Interphases
The effect of interphases on the mechanical behavior of fiber-reinforced composites is studied. Two problems, a cracked fiber in a matrix, and a fiber pulled out of a matrix, are discussed....

Theoretical and Experimental Mechanisms of Toughening in Multi-phase Materials
Multi-phase materials are an important class of materials being developed for aerospace primary structural applications. Multi-phase materials are those materials consisting of two or...

A Model to Predict Restrained Shrinkage Cracking of Fiber Reinforced Concrete
Cracking due to restrained shrinkage occurs very often in an engineering practice, causing serious problems such as increased water permeability of the structure and corrosion of the reinforcement....

A Micromechanics Model for Rough Interfaces
A new constitutive model for transfer of interfacial tractions along rough cracks in strain softening composites is presented. The model relates the normal and shearing stresses on the...

Ocean Mining with Shoreline Protection
This paper describes an existing construction system that permits building large concrete structures directly on the water in low-cost floating formwork with unskilled local labor operating...

Composite Liner, Leak Detection System, and Floating Cover for Nuclear Reactor Emergency Retention Basins
Existing reactor effluent basins are being retrofitted with composite liners, leak detection system and floating covers. Such basins have a 15-year life and remain empty until an accident...

The Great Canadian Bridge Slide
An aging multispan swing bridge had to be replaced in Trenton, Ont., with minimal interference to both river and road traffic, and without changing its alignment. The solution was to build...

Composite Materials Show Promise for Clean Kaplan Runners
In order to prevent any possibility of oil leakage into river water, LMZ manufactured Kaplan runners containing oil in the blade servomotor only, while the blade operating mechanism operates...

Overtopping Protection for A. R. Bowman Dam
Arthur R. Bowman Dam is a 245-foot-high (74.7-m) central-core rockfill dam located on the Crooked River in central Oregon. The probable maximum flood (PMF) would overtop the dam by 20...

Composite Twin Tub Bridge Erection Intersection of Interstate I-84 and I-94 in Hartford, Connecticut
Curved bridge erection requires detailed preparation by the contractor, plus a sharing of responsibility and liability between the owner, designer of the new structure and the contractor....

Oceanic CO₂ Uptake and Future Atmospheric CO₂ Concentrations
The global pattern of water column inventories of bomb-produced ¹⁴C suggests that an upwelling of bomb ¹⁴C-free...

Designing Better Hollow Fibre Contactors
In this paper we calculate optimum hollow fibre module designs for gas absorption by maximizing the mass transferred per unit cost. Two costs are considered; the membrane cost and the...

Rehab Roundup
The concrete exterior of San Franciso's Coit Tower was damaged and the murals were being destroyed by water infiltrating the structure. Interactive Resources, Inc., Point...

Quake-Safe Housing, Again
Because so little data exist about earthquake behavior of buildings that have been strengthened to meet seismic codes, many engineers are curious about the Hotel Oakland in California...

San Francisco Double-Deck Viaduct Retrofits
Following the Loma Prieta Earthquake in October 1989, six double-deck reinforced concrete viaducts in San Francisco were closed because of some isolated damage, and as a precaution for...

Seismic Analysis and Design of RC Lifelines
This paper describes the general approach for analyzing a soil-reinforced concrete lifeline system subjected to seismic loading, and the development and importance of transfer functions...

Load Sharing Benefits of Composite Pile Systems
The paper develops design techniques which will allow piled systems to be extended into more onerous operating conditions. In storm events marinas always develop failure mechanisms at...

 

 

 

 

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