河砂与石英砂对蒸养超高性能混凝土(UHPC)性能的影响及机理

doi:10.11896/cldb.22040216

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Abstract River sand and quartz sand with similar particle size distributions were used for developing ultra-high performance concrete (UHPC) with different binder to sand ratios. Multiple properties of UHPC using two types of fine aggregates with different binder to sand ratios in fresh and hardened state were investigated with various methods. The results showed that, UHPC prepared with river sand had a better workability than that with quartz sand. UHPC prepared with river sand and binder to sand ratio of 1.0 had the highest compressive strength and tensile strength as well as a remarkable strain hardening behavior. UHPC prepared with quartz sand and binder to sand ratio of 0.8 had the lowest tensile strength and almost no strain hardening behavior. It was found that, sand type and binder to sand ratio had limited impact on products of cement hydration and pozzolanic reaction. A depletion of Ca(OH)₂ in hardened paste was found in all samples. The diameter of majority pores present in UHPC was smaller than 1 μm. Compared with UHPC prepared with river sand, that with quartz sand had more pores with a diameter smaller than 1 μm. ITZ between river sand and hardened paste was denser than that between quartz sand and hardened paste. In addition, the bond between paste and fiber of UHPC prepared with river sand was better than that with quartz sand based on visual inspection of SEM images.

Key words： UHPC quartz sand river sand binder to sand ratio steam-curing mechanical property micro-structure

Published: 10 April 2024 Online: 2024-04-11

CLC number:

TV431+.3

Fund:Chongqing Science and Technology Bureau (cstc2020kqjscx-phxm1594), Shanghai Municipal Science and Technology Commission (19DZ1202702,19DZ1201404), Shanghai Municipal Construction Commission (2021-001-002) and Ministry of Housing and Urban-Rural Deve-lopment Project (K20200988).

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	Articles by authors
	ZHENG Kunpeng
	GE Haosheng
	LI Zhengchuan
	LIU Guiying
	TIAN Guangwen
	WANG Wanzhi
	XU Guohua
	SUN Zhenping

Cite this article:

ZHENG Kunpeng,GE Haosheng,LI Zhengchuan, et al. Influence and Mechanism of River Sand and Quartz Sand on Properties of Steam-cured Ultra-high Performance Concrete[J]. Materials Reports, 2024, 38(7): 22040216-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22040216 OR http://www.mater-rep.com/EN/Y2024/V38/I7/22040216

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