采用纳米氧化铝制备高弹性模量超高性能混凝土的可行性研究

doi:10.11896/cldb. 22110073

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Abstract Nano material has been regarded as a promising material with wide applications in cement-based materials because of its unique properties, such as small particle size, big specific surface area, and high chemical activity. Elastic modulus is one of the critical mechanics parameters of ultra-high performance concrete (UHPC). Currently, although the compressive strength of UHPC has been increased significantly, the increasing magnitude of elastic modulus of UHPC is far lower than that of compressive strength. To explore the feasibility of producing UHPC with high elastic modulus by nano alumina (NA), the initial mixture of UHPC was designed via MAA model, and the effects of different contents of NA on the fluidity, mechanical properties, and durability of UHPC were systematically studied. In addition, the influence of NA on the micro pore structure and micromechanical properties of UHPC was also investigated. It was found that, (ⅰ) the flexural strength, compressive strength, and elastic modulus of UHPC at curing age of 28 d were increased by 8.23%—16.31%, 8.04%—26.39%, 9.44%—16.55%, respectively, because of the utilization of NA; (ⅱ) the drying shrinkage and chloride-ion migration coefficient were reduced by 2.54%—13.01% and 8.21%—17.28%, respectively, due to the addition of NA; (ⅲ) the pore structure of UHPC and the elastic modulus of UHPC paste could be improved via NA; (ⅳ) the optimal content of NA was 1.0%, considering the effects of NA on the fluidity, mechanical properties, and durability of UHPC. The findings of this work are of guiding significance for the producing of UHPC with high elastic modulus.

Key words： nano alumina ultra-high performance concrete mechanical property elastic modulus drying shrinkage durability

Published: 10 March 2024 Online: 2024-03-18

CLC number:

TU528

Fund:National Natural Science Foundation of China (52278262) and the National Natural Science Foundation Youth Fund of China (52108197).

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	Articles by authors
	CHU Hongyan
	TANG Jinhui
	WANG Qun
	GAO Li
	ZHAO Zhihao

Cite this article:

CHU Hongyan,TANG Jinhui,WANG Qun, et al. Feasibility of Producing Ultra-high Performance Concrete with High Elastic Modulus by Nano Alumina[J]. Materials Reports, 2024, 38(5): 22110073-6.

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http://www.mater-rep.com/EN/10.11896/cldb. 22110073 OR http://www.mater-rep.com/EN/Y2024/V38/I5/22110073

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