United States Department of Transportation
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Effects of wet mat curing time and earlier loading on long-term durability of bridge decks : compressive strength, maturity and strength durability index (SDI).
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2009-01-01
[PDF-7.28 MB]
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Edition:Final report; Apr. 7, 1999-Aug. 31, 2004.
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Abstract:There is increasing pressure from owners, contractors, and the public to open bridge decks sooner to full
traffic loads. As a result, a set of criteria or guidelines is needed to determine when concrete bridge decks can
safely be opened. Today, current practice allows many bridge decks and concrete pavements to be opened to traffic
once a desired compressive strength is achieved from a representative field-cast test cylinder. Though generally
untrue, many believe that this strength value serves as a measure of the durability of the placed concrete. In a
collaborative research effort between Texas Department of Transportation and researchers at Texas Tech
University, studies were undertaken to collect research data that could potentially lead to the development of new
guidelines as to when bridge decks can be open to (a) construction traffic and (b) full traffic without sacrificing
concrete durability. This report presents detailed findings of two research thrusts: compressive strength and
maturity curves commonly used on bridge deck concrete mixes and comparative assessment of the effectiveness of
three curing methods that led to the development of a framework for a Strength-Durability Index (SDI).
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