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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

37卷

期数:

2020年01期

页码:

26-32

栏目:

出版日期:

2020-01-30

文章信息/Info

Title:

Effect of Mixed Nano-SiO₂ and Fly Ash on Properties of Recycled Aggregate Concrete

文章编号:

1673-2049(2020)01-0026-07

作者:

肖建庄,陈祥磊,李 标,薛松涛,段珍华

(同济大学 土木工程学院,上海 200092)

Author(s):

XIAO Jian-zhuang, CHEN Xiang-lei, LI Biao, XUE Song-tao, DUAN Zhen-hua

(College of Civil Engineering, Tongji University, Shanghai 200092, China)

关键词:

再生混凝土;  老砂浆;  纳米SiO₂;  粉煤灰;  质量取代法

Keywords:

recycled aggregate concrete;  old mortar;  Nano-SiO₂;  fly ash;  mass substitution method

分类号:

TU973.2

DOI:

10.19815/j.jace.2019.03027

文献标志码:

A

摘要:

使用质量取代法研究粉煤灰和纳米SiO₂单掺及复掺对再生混凝土(RAC)工作性能、抗压强度(7,28,90 d)、抗折强度(28 d)和劈裂抗拉强度(28 d)的影响。浇筑试样时,基于现有的搅拌方式,提出了新的两阶段搅拌法,先将再生粗骨料和纳米SiO₂、附加水进行搅拌,使得部分纳米SiO₂颗粒能够被再生粗骨料吸收,用于填补老砂浆孔隙和微裂缝。结果表明:随着纳米SiO₂掺量增加,再生混凝土的坍落度逐渐减小,复掺粉煤灰能够减少纳米SiO₂引起的坍落度损失; 粉煤灰掺量不变的情况下,再生混凝土抗压、抗折和劈裂抗拉强度随着纳米SiO₂掺量的增加而增加; 复掺纳米SiO₂和粉煤灰不但能够补偿再生混凝土由粉煤灰引起的早期强度降低,而且90 d龄期抗压强度明显高于2种材料单掺的再生混凝土; 纳米SiO₂掺量(质量分数)为1%时,再生混凝土在90 d龄期的抗压强度相对再生混凝土提高了3.0 MPa; 复掺纳米SiO₂和粉煤灰对再生混凝土的抗折强度、劈裂抗拉强度也有显著提升,S2F30的抗折强度相对于F30增加了24.17%,且劈裂抗拉强度高于2种材料单掺的再生混凝土,相对于F30提高了12.68%。

Abstract:

The effects of fly ash and Nano-SiO₂ on the workability, compressive strength(7, 28, 90 d), flexural strength(28 d)and splitting tensile strength(28 d)of recycled aggregate concrete(RAC)were studied by using mass substitution method. When casting the sample, a new two-stage mixing method was proposed based on the existing mixing method. The recycled coarse aggregate, Nano-SiO₂ and additional water were stirred, so that some Nano-SiO₂ particles could be absorbed by the recycled coarse aggregate to fill the pores and micro cracks of the old mortar. The results show that the slump of RAC decreases with the increase of Nano-SiO₂ content, and the reduction of slump caused by Nano-SiO₂ can be alleviated with the addition of fly ash. Under the condition of the same fly ash content, the compressive strength, flexural strength and splitting tensile strength of RAC grow up with the increased content of Nano-SiO₂. With the combination of Nano-SiO₂ and fly ash, not only the early strength reduction of RAC caused by fly ash can be compensated, but also the compressive strength of RAC at the age of 90 d is significantly higher than that of RAC adding the two materials respectively. When the mass fraction of Nano-SiO₂ content is 1%, the compressive strength of recycled concrete at the age of 90 d increases by 3.0 MPa compared with RAC. The flexural strength and splitting tensile strength of RAC are significantly improved by adding both Nano-SiO₂ and fly ash. The flexural strength of S2F30 is 24.17% higher than that of F30, and the splitting tensile strength of S2F30 is 12.68% higher than that of RAC mixed with Nano-SiO₂ or fly ash alone.

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备注/Memo

备注/Memo:

收稿日期:2019-04-07
基金项目:科技部中日合作重点项目(2016YFE0118200); 国家自然科学基金重点项目(51438007)
作者简介:肖建庄(1968-),男,山东沂南人,教授,博士研究生导师,工学博士,E-mail:jzx@tongji.edu.cn。

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更新日期/Last Update: 2020-01-13