Beatrix Kerkhoff, Portland Cement Association The development of air-entrained concrete in the mid-1930s was one of the greatest advances in concrete technology. Air-entrained concrete contains small and stable air bubbles that are uniformly distributed throughout the cement paste. Air-entrained concrete
HPC ON THE I-15 RECONSTRUCTION PROJECT
Raymond D. Cook, Utah Department of Transportation The 17-mile (27-km) long, $1.59 billion I-15 Reconstruction Project in Salt Lake City, Utah, was the nation’s largest design-build highway project awarded to a single contractor. The project included the design and construction
NEW YORK STATE—FULL-SCALE IMPLEMENTATION OF HPC
Mathew Royce, New York State Department of Transportation New York State Department of Transportation (NYSDOT) implemented the use of high performance concrete (HPC) for bridge beams with the completion of three bridges in 2001. An additional 19 bridges are now
Question and Answer
Question: What is service life and how is it predicted? Answer: The AASHTO LRFD Bridge Design Specifications defines service life as the period of time that the bridge is expected to be in operation. The design life is defined as
BENEFITS OF CHEMICAL ADMIXTURES IN HPC
Michael A. Caldarone, Construction Technology Laboratories, Inc. Chemical admixtures have been incorporated into concrete mix proportions for many years in order to attain performance properties. Most high performance concrete (HPC) mixes contain at least one type of chemical admixture. In