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.
作者简介: 刘家文,重庆大学材料科学与工程学院建筑材料工程系,在读硕士研究生,主要从事水泥基材料耐久性研究。 王冲,重庆大学材料科学与工程学院建筑材料工程系,博士,教授。主要从事水泥基材料耐久性研究。国内外核心学术刊物ACI Materials Journal、Construction and Building Materials、《硅酸盐学报》等审稿专家。
引用本文:
刘家文, 王冲, 熊光启. 可再分散沥青粉与纳米SiO2复合制备刚性自防水混凝土的研究[J]. 材料导报, 2020, 34(8): 8090-8095.
LIU Jiawen, WANG Chong, XIONG Guangqi. Research on the Preparation of Rigid Self-waterproofing Concrete by Using RAP and Nano-SiO2. Materials Reports, 2020, 34(8): 8090-8095.
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2020, Vol. 34 
