组成及骨料特性对UHPC基体流动性和抗压强度的影响

doi:10.11896/cldb.22060073

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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.

Key words： ultra-high-performance concrete matrix close particle packing theory mixture design parameters aggregate characteristics flowability compressive strength

Published: 25 September 2023 Online: 2023-09-18

CLC number:

TU528

Fund:National Natural Science Foundation of China (52008164), the Fundamental Research Funds for the Central Universities Under Project (531118010484), Ministry of Science and Technology of the People's Republic of China under Project (2018YFC0705400), and the National Science Foundation of Hunan Province of China (2022JJ30144).

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	ZHOU Min
	WU Zemei
	OUYANG Xue
	HU Xiang
	SHI Caijun

Cite this article:

ZHOU Min,WU Zemei,OUYANG Xue, et al. Effects of Composition and Aggregate Characteristics on the Flowability and Compressive Strength of UHPC Matrix[J]. Materials Reports, 2023, 37(18): 22060073-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22060073 OR http://www.mater-rep.com/EN/Y2023/V37/I18/22060073

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