期刊信息
主管单位:教育部
主办单位:重庆大学
主  编:刘汉龙
地  址:重庆市沙坪坝区沙正街174号 重庆大学期刊社 《土木与环境工程学报》编辑部
邮政编码:400044
电  话:023-65111322;023-65111863
电子邮件:xuebao@cqu.edu.cn
国际标准刊号:ISSN 2096-6717
国内统一刊号:CN 50-1218/TU
邮发代号:78-48
每期定价:¥20
全年定价:¥120
访问统计
  • 您是本站第3757655位读者
  • 今日访问1530
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 173次   下载 61 本文二维码信息
码上扫一扫!
分享到: 微信 更多
早龄期低钙粉煤灰基地聚物混凝土拉伸徐变特性
赵人达, 成正清, 文甜, 徐腾飞, 原元, 李健
西南交通大学 土木工程学院, 成都 610031
摘要:
对早龄期低钙粉煤灰基地聚物混凝土拉伸徐变特性的把握,能够为受拉状态地聚物混凝土的应力解析及开裂预测提供重要的参数依据。采用自制混凝土拉伸徐变试验装置,通过恒定应力下的混凝土拉伸徐变试验获取混凝土比徐变、徐变增长速率等徐变特性,研究不同初始加载龄期(2、3、4 d)对低钙粉煤灰基地聚物混凝土拉伸徐变的影响。结果表明:高温密封养护可以使低钙粉煤灰基地聚物混凝土短时间内达到强度稳定状态;低钙粉煤灰基地聚物混凝土的拉伸徐变特性与普通水泥混凝土相似,试验初期阶段徐变增长速率较快,随持荷时间的增加,徐变增长速率迅速下降;在同一应力强度比下,初始加载龄期越大,比徐变越小,试验初期阶段的徐变增长速率也越小;相较于试验中期阶段与后期阶段,初始加载龄期对试验初期阶段的徐变影响更大。
关键词:  早龄期  地聚物混凝土  拉伸徐变  初始加载龄期  比徐变
DOI:10.11835/j.issn.2096-6717.2019.129
分类号:TU528.31
基金项目:国家自然科学基金(51778531)
Tensile creep characteristics of early-age low-calcium fly ash-based geopolymer concrete
Zhao Renda, Cheng Zhengqing, Wen Tian, Xu Tengfei, Yuan Yuan, Li Jian
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
Abstract:
Understanding of the tensile creep behavior of early-age low-calcium fly ash-based geopolymer concrete can provide reference for stress analysis and crack prediction of tensile concrete. A self-design testing set-up was used to obtain the creep behaviors of concrete such as the creep and creep growth rate under the constant tensile stress. The effects of different initial loading ages (2d, 3d and 4d) on the behavior of tensile creep of early-age low-calcium fly ash-based geopolymer concrete were investigated. The results show that the condition of high temperature sealing curing can make the low-calcium fly ash-based geopolymer concrete reach the strength stability in a short time. The creep characteristics of the low-calcium fly ash-based geopolymer concrete are similar to those of the ordinary cement concrete. The initial creep growth rate is faster, and it decreases rapidly with time. Under the same stress-strength ratio of applied load, the larger the initial loading ages, the smaller the specific creep, and the smaller the creep growth rate at the initial stage of loading. The initial loading age has greater effect on the initial stage of loading compared with the mid and final stages.
Key words:  early-age  geopolymer concrete  tensile creep  initial loading age  specific creep
Copyright@ 2008 All Rights Reserved.
关注微信二维码