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As the number of vehicles on America's roadways continues to grow at an unprecedented rate, pavements continue to deteriorate faster and require more frequent replacement. Construction, however, causes traffic delays, which further compound the problem. Traffic delays increase user costs, which are costs incurred by the users of the roadway but are directly(More)
This study examines the transfer and development length of 15.2 mm (0.6 in.) diameter prestressing strand in high performance (high strength) concrete. Two 1067 mm (42.0 in.) deep rectangular beams, commonly called the Hoblitzell-Buckner beams, each with one row of 15.2 mm (0.6 in.) diameter strands at 51 mm (2.0 in.) spacing on center, were instrumented to(More)
After completion of a feasibility study which examined the viability of using precast concrete panels to expedite pavement construction, FHWA and TxDOT funded an implementation project to construct a precast concrete pavement pilot project to test the concepts developed through the feasibility study. This report will discuss the development and construction(More)
The use of high performance lightweight concrete in Texas prestressed concrete bridges has potential advantages and disadvantages. Advantages include reduced dead load, crane capacity, and shipping costs. Disadvantages include higher prestress losses, deflections, camber, and material costs. Prestressed concrete bridge girders can be designed with(More)
I will be discussing the problem of <i>sketch understanding</i> which, as we shall see shortly, involves much more than just recognizing sketched symbols. Most of the work that I will present has been done by myself and the other members of my former research group back at MIT, lead by Professor Randy Davis. In addition, I would like to acknowledge my(More)
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