环保型细集料对超高性能混凝土力学性能的影响

doi:10.11896/cldb.20020056

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Abstract Nowadays, the supply of river sand is not adequate to the demand in China, and thus a preliminary evaluation on the feasibility of using eco-friendly aggregates to produce green ultra-high performance concrete (UHPC) was carried out. Different mechanical properties of green UHPC were investigated according to the standard test method by replacing river sand with eco-friendly aggregates (recycled sand, manufactured sand, aeolian sand). The workability and the microstructure of green UHPC were also studied. The workability of green UHPC with eco-friendly aggregates was rather well, and their mechanical properties were comparable or even higher than those of normal UHPC with river sand. The mechanical properties of green UHPC with manufactured sand were much better, and the compressive strength, flexural strength, and modulus of elasticity of this kind of green UHPC were 169.9 MPa, 18.8 MPa, and 47.8 GPa, respectively, which indicated that the compressive strength, fle-xural strength, and modulus of elasticity of green UHPC with manufactured sand were 5.20%, 15.34%, and 5.75% higher than those of normal UHPC with river sand, respectively. In addition, the pore structure of green UHPC was improved to a certain extent due to the utilization of the manufactured sand and aeolian sand in the green UHPC.

Key words： ultra-high performance concrete recycled sand manufactured sand aeolian sand mechanical properties microstructure

Published: 24 December 2020

CLC number:

TU528.09

Fund:This work was financially supported by the National Natural Science Foundation of China (51808294), the Natural Science Foundation of the Education Department of Jiangsu (18KJB430017).

About author:: Hongyan Chu received his Ph.D. degree in Enginee-ring from Southeast University in 2017. He is currently a lecturer in Nanjing Forestry University. He is engaged in the development of high performance civil engineering materials, focusing on the preparation, characterization, and application of novel nuclear sacrificial mate-rials and green ultra-high performance cement-based materials.

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	CHU Hongyan
	JIANG Jinyang
	LI He
	XIA Guanglin

Cite this article:

CHU Hongyan,JIANG Jinyang,LI He, et al. Effects of Eco-friendly Fine Aggregates on Mechanical Properties of Ultra-high Performance Concrete[J]. Materials Reports, 2020, 34(24): 24029-24033.

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http://www.mater-rep.com/EN/10.11896/cldb.20020056 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24029

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