United States Department of Transportation
i
Development of concrete mix proportions for minimizing/eliminating shrinkage cracks in slabs and high performance grouts : final report.
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2017-02-01
[PDF-1.35 MB]
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TRIS Online Accession Number:1648347
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Abstract:The two focus areas of this research address longstanding problems of (1) cracking of concrete slabs due to creep and shrinkage and (2) high performance compositions for grouting and joining precast concrete structural elements. Cracking of bridge decks is a very common problem with no solutions other than pre-stressing. This is also a problem in other areas such as pavements in airports, seaports and highways. Reduction and possible elimination of cracking will improve the performance and increase the life span of these structures considerably. The second part is to develop user friendly grouts that can be used for precast construction including filling of shear-connector pockets and joining precast slabs. Current non-shrinking grouts use expansive cements that are effective only if the expansion can be completely prevented. The aim is to develop a formulation that will be dimensionally stable with no need for induced expansion. The best solution is to obtain concrete that has zero shrinkage but this is practically impossible. The next best solution is to restrict the shrinkage strains to the tensile strain capacity of concrete which range from 200 to 300 micro strains. If this can be achieved, the restrained shrinkage cracking problem can be solved resulting in durable structures that can last for centuries. An investigation was initiated to achieve this goal. The results presented in this report provide information on potential formulations that could provide shrinkage strains less than 300 micro strains, higher tensile strain capacity and rapid set formulations for assembling precast slabs and shear connectors, which can be field-usable.
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