Study on the Optimum Mix Ratio of Fly Ash based Ultra-high Performance Concrete
The fly ash partially replaces cement to prepare UHPC.The effects of fly ash-based mineral admixture FA-ad,the type and content of superplasticizer,sand,the ratio of fly ash to sand,the ratio of cementitious materials,the water-binder ratio and the content of steel fiber on the fluidity and mechanical properties of UHPC are studied,and the mix proportion of UHPC is optimized by combining the above factors.The results show that FA-ad,a mineral admixture based on fly ash,has the greatest influence on the fluidity of UHPC.SD～600P～02 water reducing agent has the best effect;The sand-cement ratio of 1:1 is more suitable,the optimum content of mineral admixture is 25％,the optimum water-binder ratio is 0.18,the optimum dosage of steel fiber is 2％.
ultra-high performance concretefly ashfluiditymechanical propertiesmix rat
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