[1]陈宗平,戴上秦,王成,等.高温后消防喷水型钢再生混凝土黏结性能试验研究[J].自然灾害学报,2020,29(02):001-9.[doi:10.13577/j.jnd.2020.0201]
 CHEN Zongping,DAI Shangqin,WANG Cheng,et al.Experimental study on bonding performance of steel reinforced recycled aggregate concrete after high temperature fire-fighting sprinkler[J].,2020,29(02):001-9.[doi:10.13577/j.jnd.2020.0201]
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高温后消防喷水型钢再生混凝土黏结性能试验研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
29
期数:
2020年02期
页码:
001-9
栏目:
出版日期:
2020-04-28

文章信息/Info

Title:
Experimental study on bonding performance of steel reinforced recycled aggregate concrete after high temperature fire-fighting sprinkler
作者:
陈宗平12 戴上秦1 王成1 周济1
1. 广西大学 土木建筑工程学院, 广西 南宁 530004;
2. 广西大学工程防灾与结构安全教育部重点实验室, 广西 南宁 530004
Author(s):
CHEN Zongping12 DAI Shangqin1 WANG Cheng1 ZHOU Ji1
1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education, Guangxi University, Nanning 530004, China
关键词:
消防喷水高温型钢再生混凝土推出试验黏结强度
Keywords:
fire-fighting sprinklerhigh temperaturesteel reinforced recycled aggregate concretepush-out testbond strength
分类号:
TU521.1;TU37;X9
DOI:
10.13577/j.jnd.2020.0201
摘要:
为揭示高温后消防喷水型钢再生混凝土黏结滑移性能,以再生粗集料取代率、历经最高温度为变化参数,设计了20个高温后消防喷水型钢再生混凝土试件进行推出试验,观察了型钢再生混凝土试件的表面特征、破坏过程及破坏形态,测量了型钢再生混凝土的质量损失率,获取了各试件的极限黏结强度和残余黏结强度,分析了变化参数对高温后消防喷水型钢再生混凝土黏结强度的影响规律。结果表明,高温后消防喷水型钢再生混凝土的表面颜色随着温度的上升而不断加深;质量损失率随着温度的上升不断增加;高温后消防喷水型钢再生混凝土的黏结强度随温度的变化规律可以从取代率为25%与50%之间划分为两种:取代率为50%及以上的高取代率型钢再生混凝土,黏结强度变化趋势同全再生取代率型钢再生混凝土相似,取代率为25%及以下的低取代率型钢再生混凝土,黏结强度变化趋势同普通型钢混凝土相似。最后本次试验提出了两类高温后消防喷水型钢再生混凝土极限黏结强度和残余黏结强度计算公式,其计算值与试验值吻合较好。
Abstract:
In order to reveal the interface bond-slip behavior of steel and recycle concrete after high temperature and water cooling, 20 steel reinforced recycled aggregate concrete specimens after high temperature fire-fighting sprinkler were designed with the replacement rate of recycled coarse aggregates and the highest temperature as the variation parameters to carry out the push-out test. We observed the surface characteristics, the failure process and failure pattern of the steel reinforced recycled aggregate concrete specimens, measured the mass loss rate of the steel reinforced recycled aggregate concrete specimens, obtained the ultimate bond strength and the residual bond strength of each specimen, and analyzed the influence of changing parameters on the bond strength of steel reinforced recycled aggregate concrete. The results show that the surface color of recycled steel reinforced concrete after high temperature spraying by fire service is deepened with the rise of temperature. The mass loss rate increases with the increase of temperature. The variation of bonding strength with temperature of steel reinforced recycled aggregate concrete after high temperature fire-fighting sprinkler can be divided into two types from the substitution rate of 25% to 50%. The variation trend of bond strength of recycled steel concrete with high substitution rate of 50% or above is similar to that of recycled steel concrete with full replace rate, and that of recycled steel concrete with low replace rate of 25% or less is similar to that of ordinary steel concrete. At last, two kinds of formulas for calculating ultimate bond strength and residual bond strength of steel reinforced recycled aggregate concrete after high temperature fire-fighting sprinkler are put forward, and the calculated values are in good agreement with the experimental values.

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备注/Memo

备注/Memo:
收稿日期:2019-09-11;改回日期:2019-10-21。
基金项目:国家自然科学基金项目(51578163);广西重点研发计划项目(2017AB02006);八桂学者专项经费资助项目([2019]79号)
作者简介:陈宗平(1975-),男,教授,博士,博士生导师,主要从事钢与混凝土组合结构、再生混凝土结构、异形柱结构、海洋及近海混凝土结构等方面研究.E-mail:zpchen@gxu.edu.cn
更新日期/Last Update: 1900-01-01