[1]吴耀鹏,李晓蕾,姜厚文,等.不同配合比再生混凝土高温后的残余抗压强度[J].西安建筑科技大学学报(自然科学版),2017,49(03):375-381.[doi:10.15986/j.1006-7930.2017.03.010]
　WU Yaopeng,LI Xiaolei,JIANG Houwen,et al.Residual compressive strength of recycled aggregate concrete with the different mixture ratio after high temperature[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2017,49(03):375-381.[doi:10.15986/j.1006-7930.2017.03.010]
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不同配合比再生混凝土高温后的残余抗压强度()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
49
期数:
2017年03期
页码:
375-381
栏目:
出版日期:
2017-06-30

文章信息/Info

Title:
Residual compressive strength of recycled aggregate concrete with the different mixture ratio after high temperature
文章编号:
1006-7930(2017)03-0375-07
作者:
吴耀鹏1; 李晓蕾1; 姜厚文2; 张冲1
（1.西安建筑科技大学土木工程学院，陕西 西安 710055；2.山西晋投玄武岩开发有限公司，山西 大同037000）
Author(s):
WU Yaopeng1;  LI Xiaolei1;  JIANG Houwen2;  ZHANG Chong1
(1. School of Civil Engineering, Xi′an Univ of Arch & Tech, Xi′an 710055, China; 2. Shanxi Ecic Basalt DevelopmentCo,LTD, Datong 037000, China)
关键词:
高温; 再生混凝土; 水胶比; 粉煤灰
Keywords:
high temperature;  recycled aggregate concrete;  water-binder ratio;  fly-ash
分类号:
TU502.6
DOI:
10.15986/j.1006-7930.2017.03.010
文献标志码:
A
摘要:
浇筑15种配合比的100 mm×100 mm×100 mm混凝土立方体试件，将不同水胶比（0.34、0.4和0.5）、不同粉煤灰掺量（0%、30%和50%）的普通混凝土和再生混凝土试件经200~800 ℃高温处理后进行静压试验，并测得其抗压强度. 结果表明：经400 ℃高温作用后，不同于普通混凝土，水胶比为0.34时的再生混凝土强度低于水胶比为0.4时的强度；对于不同配合比混凝土试件，高温时的强度损失率，低水胶比时较高水胶比时大；粉煤灰的微集料效应可以弥补低水胶比下水泥浆与再生骨料结合面不良的缺陷；粉煤灰的二次水化作用可以有效弥补再生混凝土因高温作用引起的强度损失.
Abstract:
The concrete cube specimens (100 mm×100 mm×100 mm) with 15 kinds of mixture ratios were cast. And the compressive strengths of ordinary and recycled aggregate concrete with different water-binder ratios (0.34, 0.4, and 0.5) and fly-ash dosage (0%, 30%, and 50%) were tested after exposure to high temperature (200~800 ℃). The results show that after exposure to 400 ℃, the compressive strength of recycled aggregate concrete at low water-binder ratio (0.34) is lower than at high water-binder ratio (0.4), which is different from the ordinary concrete. In addition, the compressive strength loss rate of the specimens with lower water-binder ratio is larger than the higher one. The micro-aggregate effect of fly-ash can remedy the poor surface combination between cement and recycled aggregates, especially at low water-binder ratio. And the secondary hydration of fly-ash can compensate for the strength loss of recycled aggregate concrete because of high temperature.

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备注/Memo

备注/Memo:
收稿日期:2016-06-25 修改稿日期:2017-05-24 基金项目:国家自然科学基金资助项目(51108371); 陕西省自然科学基础研究基金资助项目(2015JM5164); 西安市工业应用技术研发基金资助项目(CXY1432(4)); 陕西省教育厅重点实验室科研计划基金资助项目(16JS050) 作者简介:吴耀鹏（1979-），男，博士，副教授，主要从事结构抗火研究．E-mail: wyp@ xauat.edu.cn
更新日期/Last Update: 2017-08-27