复合改性再生混凝土抗氯离子渗透性能_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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复合改性再生混凝土抗氯离子渗透性能

Study on Chloride Penetration Resistance of Compound Modified Recycled Concrete

２０19年第10期

再生混凝土；复合改性；纳米SiO2；粉煤灰；抗氯离子渗透

Recycled aggregate concrete; Compound modification; Nano-silica; Fly ash; Chloride penetration resistance

２０19年第10期

10.19761/j.1000-4637.2019.10.001.05

国家自然科学基金重点项目（51438007）；国家科技部中日合作重点项目（2016YFE0118200）。

肖建庄1, 2，李标1，杨钱荣2，杨晓斌3

1.同济大学土木工程学院，上海 200092；2.同济大学先进土木工程材料教育部重点实验室，上海 200092；3.上海建冶机器有限公司，200129

肖建庄1, 2，李标1，杨钱荣2，杨晓斌3

肖建庄,李标,杨钱荣,等.复合改性再生混凝土抗氯离子渗透性能[J].混凝土与水泥制品,2019(10):1-5.

XIAO J Z,LI B,YANG Q R,et al.Study on Chloride Penetration Resistance of Compound Modified Recycled Concrete[J].China Concrete and Cement Products,2019(10):1-5.

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摘要：提出了粉煤灰和纳米SiO2的复合改性方法，使用质量取代法，研究了粉煤灰和纳米SiO2单掺及复掺对再生混凝土（RAC）抗氯离子渗透性能（84 d）的影响。结果表明，再生粗骨料全部取代天然粗骨料会显著降低抗氯离子渗透性能，84 d氯离子迁移系数和电通量分别提高了101.7%和89.1%；单掺SiO2或粉煤灰时，随着取代率的提高抗氯离子渗透性能越好。复掺纳米SiO2和粉煤灰能够产生叠加效应，显著提高RAC的抗氯离子渗透性能，其中复掺2%纳米SiO2与30%粉煤灰时84 d氯离子迁移系数和电通量分别降低了72.3%和89.1%，甚至优于普通混凝土，并且相同掺量的纳米SiO2对30%的粉煤灰改性效果更好。 Abstract: A method to modify recycled aggregate concrete (RAC) by combining Nano-silica and fly ash was put forward, and the effect of Nano-silica and fly ash on iron penetration resistance (84 d) of RAC was investigated using mass substitution method to replace natural aggregate (NA) by recycled aggregate (RA). Results show that RA can decrease the ability of concrete to resist iron penetration significantly, the coefficient of chloride migration and electric flux increased 101.7% and 89.1% respectively. Using Nano-silica and fly ash alone can intensify the resistance to iron penetration with the increase of dosage. Moreover, combination of Nano-silica and fly ash can perform excellent synergistic effect on resistance to iron penetration better than single effect of both of them. Among them, combining 2% Nano-silica and 30% fly ash reduce the coefficient of chloride migration and electric flux by 72.3% and 89.1% at curing age of 84 d respectively.

英文名 : Study on Chloride Penetration Resistance of Compound Modified Recycled Concrete

刊期 : ２０19年第10期

关键词 : 再生混凝土；复合改性；纳米SiO2；粉煤灰；抗氯离子渗透

Key words : Recycled aggregate concrete; Compound modification; Nano-silica; Fly ash; Chloride penetration resistance

刊期 : ２０19年第10期

DOI : 10.19761/j.1000-4637.2019.10.001.05

文章编号 :

基金项目 : 国家自然科学基金重点项目（51438007）；国家科技部中日合作重点项目（2016YFE0118200）。

作者 : 肖建庄1, 2，李标1，杨钱荣2，杨晓斌3

单位 : 1.同济大学土木工程学院，上海 200092；2.同济大学先进土木工程材料教育部重点实验室，上海 200092；3.上海建冶机器有限公司，200129

肖建庄1, 2，李标1，杨钱荣2，杨晓斌3

肖建庄,李标,杨钱荣,等.复合改性再生混凝土抗氯离子渗透性能[J].混凝土与水泥制品,2019(10):1-5.

XIAO J Z,LI B,YANG Q R,et al.Study on Chloride Penetration Resistance of Compound Modified Recycled Concrete[J].China Concrete and Cement Products,2019(10):1-5.

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摘要

参数

结论

参考文献

引用本文

摘要：提出了粉煤灰和纳米SiO₂的复合改性方法，使用质量取代法，研究了粉煤灰和纳米SiO₂单掺及复掺对再生混凝土（RAC）抗氯离子渗透性能（84 d）的影响。结果表明，再生粗骨料全部取代天然粗骨料会显著降低抗氯离子渗透性能，84 d氯离子迁移系数和电通量分别提高了101.7%和89.1%；单掺SiO₂或粉煤灰时，随着取代率的提高抗氯离子渗透性能越好。复掺纳米SiO₂和粉煤灰能够产生叠加效应，显著提高RAC的抗氯离子渗透性能，其中复掺2%纳米SiO₂与30%粉煤灰时84 d氯离子迁移系数和电通量分别降低了72.3%和89.1%，甚至优于普通混凝土，并且相同掺量的纳米SiO₂对30%的粉煤灰改性效果更好。
Abstract: A method to modify recycled aggregate concrete (RAC) by combining Nano-silica and fly ash was put forward, and the effect of Nano-silica and fly ash on iron penetration resistance (84 d) of RAC was investigated using mass substitution method to replace natural aggregate (NA) by recycled aggregate (RA). Results show that RA can decrease the ability of concrete to resist iron penetration significantly, the coefficient of chloride migration and electric flux increased 101.7% and 89.1% respectively. Using Nano-silica and fly ash alone can intensify the resistance to iron penetration with the increase of dosage. Moreover, combination of Nano-silica and fly ash can perform excellent synergistic effect on resistance to iron penetration better than single effect of both of them. Among them, combining 2% Nano-silica and 30% fly ash reduce the coefficient of chloride migration and electric flux by 72.3% and 89.1% at curing age of 84 d respectively.

关键词:

再生混凝土；复合改性；纳米SiO2；粉煤灰；抗氯离子渗透

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