Study on Mechanical Properties of Microbead Modified Super Sulfate Cement Concrete

The microbead modified super sulfate cement (SSC) was employed to prepare C60~C80 concrete, this work emphasis on mechanical properties and micro-mechanism, besides, the service behaviors of fresh concrete was tested. The SSC concrete mechanical properties influenced by particles size of microbead, slag and gypsum were discussed. Mechanisms of mechanical properties changes were elaborated from micro, meso and macro scales, mechanical model was established and relevant rules of mechanical properties development were obtained. Experiment results show that compressive strength increased with the largerer specific surface area of microbead, slag powder and gypsum. There was a promoting effect for SSC concrete hydration reaction by appropriate dosage (10%~20%) of microbead, which had prominent interstitial effect and system with excellent gradation, and fresh concrete workability was significantly improved. The compressive strength—curing ages model of high strength SSC concrete was established by half value intensity index, which coincide well with measured values. Key words: super sulphated cement concrete, microbead, mechanical properties, mechanical model, specific surface area