Mary Lou Ralls, Texas Department of Transportation and Benjamin Tang, Federal Highway Administration Transportation agencies today face significant challenges to restore highway capacity while enhancing safety through construction work zones. About one-third of our Nation’s bridges are in need of
Question and Answer
Question: What curing is necessary for HPC precast, prestressed concrete beams after the strands are detensioned? Answer: Curing involves actions taken to maintain proper moisture and temperature conditions in freshly placed concrete. This allows cement hydration and pozzolanic reactions to
HPC GUIDE SPECIFICATION FOR BRIDGES
Rachel Detwiler, Construction Technology Laboratories, Inc. and Shri Bhidé, Portland Cement Association Greater emphasis is being placed on constructing public infrastructure, in particular bridges, using the best available technology to ensure that the resulting structures return the greatest benefit to
HPC IMPLEMENTATION STATUS
Louis N. Triandafilou, Federal Highway Administration Since the initiation of the AASHTO/SHRP Lead States Team concept for high performance concrete (HPC) over 10 years ago, there has been an aggressive effort by the concrete industry, State DOTs, and the FHWA
Question and Answer
Question: How can vertical pre-release cracks in prestressed concrete beams be avoided? Answer: Vertical cracks have been observed in prestressed concrete beams before the prestressing strands are released. Their occurrence appears to be more frequent in deep, long-span members. These