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Alternative Title:TechBrief
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Abstract:Concrete with a unit weight between that of traditional lightweight
concrete (LWC) and normal weight concrete (NWC)
is not covered in the American Association of State Highway
Transportation Officials (AASHTO) Load and Resistance Factor
Design (LRFD) Bridge Design Specifications.(1) This research
program includes a significant number of bond strength tests
on this type of concrete. The results from this research project
are included in a database that covers a broader range of unit
weights in order to determine trends for LWC as a function
of unit weight. New design expressions for the development
length of mild steel in tension are proposed for LWC that
include a modification factor for LWC based on unit weight.
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