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材料导报  2024, Vol. 38 Issue (18): 23050208-6    https://doi.org/10.11896/cldb.23050208
  无机非金属及其复合材料 |
含氯再生骨料混凝土抗氯离子渗透性能的研究
郑建岚1,2, 王晓敏1,2,*, 张建全2,3
1 福建江夏学院工程学院,福州 350108
2 福建省环保节能型高性能混凝土协同创新中心,福州 350108
3 福州大学土木工程学院,福州 350108
Study on the Resistance to Chloride Ion Permeability of Chlorinated Recycled Aggregate Concrete
ZHENG Jianlan1,2, WANG Xiaomin1,2,*, ZHANG Jianquan2,3
1 College of Engineering, Fujian Jiangxia University, Fuzhou 350108, China
2 Coordinative Innovation Center for Environmentally Friendly and Energy Saving HPC of Fujian Province, Fuzhou 350108, China
3 College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
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摘要 采用纳米SiO2溶液浸泡含氯再生骨料以降低骨料含氯量,并在此基础上考虑复掺矿物掺合料,设计16组配合比以制备C40再生骨料混凝土,测定其7 d、28 d的抗压强度与28 d的电通量、Cl-扩散系数。结果表明:再生骨料中的Cl-可提高混凝土7 d的抗压强度,少量降低其28 d的强度,但会大幅度破坏混凝土抗Cl-渗透性能;纳米SiO2溶液改性后骨料含氯量显著降低,与矿物掺合料联合作用将有效提升再生混凝土力学性能与抗Cl-渗透性能;其中,30%粉煤灰与8%硅灰复掺优化效果最佳,Cl-渗透系数较未掺掺合料组降低85.6%。基于含氯再生骨料多重界面与Cl-扩散机理,推导“内渗型”Cl-扩散模型,并将其用于含氯再生骨料混凝土构件服役任意龄期的Cl-含量预测。
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郑建岚
王晓敏
张建全
关键词:  含氯再生骨料  再生混凝土  纳米SiO2溶液浸泡  矿物掺合料  抗氯离子渗透性能    
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
发布日期:  2024-10-12
ZTFLH:  TU528  
基金资助: 国家自然科学基金联合基金重点支持项目(U1605242);福建省财政厅项目(闽财指〔2022〕840号);福建省科技厅自然科学基金项目(2020J01938)
通讯作者:  *王晓敏,通信作者,2017年3月毕业于福州大学,获得工学硕士学位,现为福建江夏学院工程学院教师。主要从事高性能混凝土及再生骨料混凝土耐久性能研究与应用工作,参编地方标准1部,发表论文8篇。727622881@qq.com   
作者简介:  郑建岚,教授、博士研究生导师,1997年浙江大学结构工程专业博士毕业,国家级百千万人才工程人选,福建省杰出科技人才,福建省科技创新领军人才,享受国务院特殊津贴专家,教育部全国高等学校优秀教师。目前主要从事高性能混凝土及再生骨料混凝土耐久性能研究,在建筑废弃物资源化利用方面贡献突出。获国家技术发明二等奖、福建省科学技术一等奖。
引用本文:    
郑建岚, 王晓敏, 张建全. 含氯再生骨料混凝土抗氯离子渗透性能的研究[J]. 材料导报, 2024, 38(18): 23050208-6.
ZHENG Jianlan, WANG Xiaomin, ZHANG Jianquan. Study on the Resistance to Chloride Ion Permeability of Chlorinated Recycled Aggregate Concrete. Materials Reports, 2024, 38(18): 23050208-6.
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http://www.mater-rep.com/CN/10.11896/cldb.23050208  或          http://www.mater-rep.com/CN/Y2024/V38/I18/23050208
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