含氯再生骨料混凝土抗氯离子渗透性能的研究

doi:10.11896/cldb.23050208

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Abstract In order to reduce the chloride ion content in recycled aggregates, nano SiO₂ solution was used to soak the recycled aggregates. On this basis, 16 sets of C40 recycled aggregate concrete mix proportions were designed with the considering of mineral admixtures adding. And the 7 d, 28 d compressive strength, 28 d electric flux, Cl^- diffusion coefficient of recycled aggregate concrete were measured. It was indicated that Cl^- in recycled aggregates would increase the 7 d compressive strength of concrete, and slightly reduce the 28 d strength, but degrade the impermeability of concrete significantly. Actually, the chlorine content of the aggregate was significantly reduced after nano SiO₂ solution modification. The mechanical properties and Cl^- permeability resistance of recycled concrete would be effectively improved with the combined effect of aggregate modification and mineral admixtures adding. And the combination of 30% fly ash and 8% silica fume had the best optimization effect, which the Cl^- permeability coefficient was reduced by 85.6% compared to the non mixed material group. Based on the multiple interfaces theory and Cl^- diffusion mechanism of chlorine containing recycled aggregate, the ‘infiltration type’ Cl^- diffusion model was derived for predicting the Cl^- content of chlorine containing recycled aggregate concrete components at any age of service.

Key words： chlorinated recycled aggregate recycled aggregate concrete nano SiO₂ solution soaking mineral admixtures chloride ion penetration resistance

Published: Online: 2024-10-12

CLC number:

TU528

Fund:This work was financially supported by the Joint Funds of the National Natural Science Foundation of China (U1605242), the Fujian Provincial Department of Finance Project (Min Finance 〔2022〕No. 840), the Natural Science Foundation of Fujian Province (2020J01938).

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	ZHENG Jianlan
	WANG Xiaomin
	ZHANG Jianquan

Cite this article:

ZHENG Jianlan,WANG Xiaomin,ZHANG Jianquan. Study on the Resistance to Chloride Ion Permeability of Chlorinated Recycled Aggregate Concrete[J]. Materials Reports, 2024, 38(18): 23050208-6.

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http://www.mater-rep.com/EN/10.11896/cldb.23050208 OR http://www.mater-rep.com/EN/Y2024/V38/I18/23050208

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