可再分散沥青粉与纳米SiO<sub>2</sub>复合制备刚性自防水混凝土的研究

doi:10.11896/cldb.19020096

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Abstract To increase the self-waterproofing properties of concrete, RAP and nano-SiO₂ were combined to prepare the rigid self-waterproofing concrete. The effect of RAP and nano-SiO₂ contents on the workability, mechanical strength, flexural-compressive strength ratio, contact angle and water penetration depth were studied, and the microscopic mechanism of modified concrete was analyzed using XRD and SEM. The results indicated that the addition of proper amount of RAP in concrete had no adverse effect on workability, and RAP could cause a slight decrease in compressive strength and a significant increase in flexural strength and flexural-compressive strength ratio of concrete. The hydrophobicity, impermeability and toughness of concrete were improved after adding RAP. When RAP was combined with nano-SiO₂, the strength and toughness of concrete were further enhanced as the nano-SiO₂ content increased. The optimal mixing amounts of RAP and nano-SiO₂ were 10.0% and 1.0%, respectively. Microscopic analysis showed that nano-SiO₂ could accelerate the demulsification and film-formation process of emulsified asphalt in concrete, and promote to produce more C-S-H gel, leading to make concrete more dense and homogeneous.

Key words： rigid self-waterproofing redispersible asphalt powder (RAP) nano-SiO₂ contact angle water penetration depth

Published: 25 April 2020

CLC number:

TU528

Fund:This work was financially supported by the National Natural Science Foundation of China (51772033).

About author:: Jiawen Liuis a postgraduate student from the department of building materials engineering, School of Materials Science and Engineering, Chongqing University. He is mainly engaged in the durability of the cement based materials.
Chong Wangis the Ph.D. and professor from the department of building materials engineering, School of Materials Science and Engineering, Chongqing University. His research interest is the durability of the cement based materials. And he is also the reviewer of academic journals at home and abroad, including ACI Materials Journal, Construction and Building Mate-rials, Journal of the Chinese Ceramic Society.

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	LIU Jiawen
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	XIONG Guangqi

Cite this article:

LIU Jiawen,WANG Chong,XIONG Guangqi. Research on the Preparation of Rigid Self-waterproofing Concrete by Using RAP and Nano-SiO₂[J]. Materials Reports, 2020, 34(8): 8090-8095.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19020096 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8090

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