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Deformation characteristics of ultra high strength concrete under unconstrained and restrained conditions

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Document pages: 8 pages

Abstract: As skyscrapers and long-span bridges become larger and larger, the requirements for concrete strength are higher and higher. However, the research of ultra-high strength concrete is still in its infancy. In particular, it is well known that the degree of self shrinkage of ultra-high strength concrete is much higher than that of ordinary strength concrete (NSC), and the possibility of early cracking is very high. Therefore, in this study, the shrinkage and cracking behaviors of high strength concrete (HSC), ultra-high strength concrete (VHSC) and ultra-high strength concrete (uhsc) were evaluated by unconstrained shrinkage test and constrained shrinkage test (ring test). The main test variables are the compressive strength level determined according to the water binder ratio (w b), fly ash content and concrete sample thickness. expertmental results demonstrated that the drying shrinkage decreased as the W B ratio and the fly ash replacement ratio increased, and the restraint cracks appeared to be the earliest and most brittle in the UHSC with the smallest W B. Increased concrete thickness and incorporation of fly ash were observed to inhibit crack initiation effectively.

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