Effects of Composition and Aggregate Characteristics on the Flowability and Compressive Strength of UHPC Matrix
ZHOU Min1,2, WU Zemei1,2,*, OUYANG Xue1,2, HU Xiang1,2, SHI Caijun1,2,*
1 Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technologies of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China 2 International Science and Technology Innovation Center for Green & Advanced Civil Engineering Materials of Hunan Province, Changsha 410082, China
Abstract: This paper calculates the proportion of each solid component in the UHPC matrix by adjusting the sand binder ratio and fitting the modified Andreasen and Andersen particle packing model. The optimal superplasticizer dosage in UHPC matrix is determined based on the wet packing density and flowability of fresh mixture. The effects of mixture design parameters (sand binder ratio, cementitious material composition), aggregate characteristics (particle sphericity, and roundness) on the flowability and compressive strength of UHPC matrix are analyzed. Test results show that when the sand binder ratio increases from 0.8 to 1.2, the wet packing density, flowability, and 7 d compressive strength of the UHPC matrix gradually decrease. After the content of cementitious materials is changed by adjusting the sand binder ratio, the flowability and wet packing density of UHPC matrix are mainly affected by the sand binder ratio. When the superplasticizer content was 0.5%—2.0%, the paste film thickness, wet packing density and flowability of UHPC matrix increased slowly and then decreased rapidly. The aggregate shape is the main factor affecting the wet packing density, flowability, and 28 d compressive strength of UHPC matrix. The main factor affecting the compressive strength of UHPC matrix is the aggregate characteristics after the UHPC matrix achieves close packing, while the cementitious material content has little effect. When the maximum particle size of aggregate is the same, the increased sphericity and roundness of crushed aggregate significantly increase the UHPC matrix's flowability while reducing the compressive strength.
周敏, 吴泽媚, 欧阳雪, 胡翔, 史才军. 组成及骨料特性对UHPC基体流动性和抗压强度的影响[J]. 材料导报, 2023, 37(18): 22060073-9.
ZHOU Min, WU Zemei, OUYANG Xue, HU Xiang, SHI Caijun. Effects of Composition and Aggregate Characteristics on the Flowability and Compressive Strength of UHPC Matrix. Materials Reports, 2023, 37(18): 22060073-9.
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2023, Vol. 37 
