Analysis of self-desiccation of high performance concrete considering effects of mixing proportions and curing conditions

초록

High performance concrete is increasingly used in modern concrete industry to produce buildings and infrastructures. However, because high performance concrete generally has lower water to binder ratios than normal strength concrete, high performance concrete presents higher self-desiccation, higher autogeneous shrinkage, and higher early–age crack tendency than normal strength concrete. This paper presents a numerical procedure to analyze self-desiccation of high performance concrete. By using a blended cement hydration model, the reaction degree of cement and mineral admixtures are calculated. The amount of chemical shrinkage, capillary water, and gel water are calculated using reaction degree of binders. Using a desorption isotherm consisting of capillary isotherm and gel isotherm, the self-desiccation of concrete are calculated. The effects of water to binder ratios, silica fume replacement ratios, fineness of cement, curing temperature, and curing conditions (sealed curing and wet curing) are taken into account. The analyzed results agree with experiment results of concrete with different mixing proportions and curing methods. © Research India Publications.

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