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An Investigation of Concrete Quality Evaluation Methods
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1972-11-01
[PDF-1.57 MB]
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Edition:Interim - September 1968 - November 1972
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Abstract:Four techniques applicable to a field survey for detecting areas of poor-quality concrete in concrete bridge decks were investigated and compared. Comparisons were also made between the measurements obtained using these four techniques and laboratory determinations of the compressive strength of cores taken from each bridge deck. It was concluded that each of the techniques, acoustic velocity, Windsor probe, Schmidt hammer and direct tensile test can be applied to a survey procedure for detecting weak spots. The results imply that core compressive strength is not the only useable indicator of concrete quality and also that the several properties of concrete which determine its quality are largely independent. Each of the above techniques and the core strengths appear to be somewhat differently influenced by the effects which accompany deterioration.
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