摘要
为研究早龄期持续压力对混凝土轴心抗压强度的影响,设计了11个系列共55个混凝土棱柱体试件,探讨早龄期持荷轴压比、持荷时间、混凝土强度等3个因素对混凝土轴心抗压强度的影响。对6个棱柱体试件在持久压力的试验装置中同时施加荷载,持荷7d后卸载,待龄期28d时进行轴心抗压试验。试验结果表明:早龄期施加适当的持续压力可以使混凝土的密实度得到提高;早龄期持荷轴压比对混凝土轴心抗压强度的影响呈先增大后减小的趋势,早龄期持荷轴压比为0.5时混凝土的轴心抗压强度提高最多;开始持荷龄期对混凝土弹性模量和轴心抗压强度的影响较小。综合各因素的影响,建议施工持续荷载引起的早龄期混凝土结构的受压应力不应超过混凝土轴心抗压强度的50%。
In order to study the influence of early sustained compression on the axial compressive strength,the 11 series concrete specimens which beard early sustained load are designed,three factors including the sustained axial compression ratio,beginning loaded age and concrete strength are considered. Meanwhile,the test device which can apply sustained compression load on 6 prism specimens at the same time is designed. The compression load is applied for 7 days then unload to research on prism specimens＇ compressive strength at 28 days age. The test results show that the sustained compression at the early age can improve concrete compactness. The influence of sustained axial compression ratio increases firstly and then decreases. When the sustained axial compression ratio is0. 5,the compressive performance of concrete improves mostly. The effect of the beginning loaded age on the elastic modulus and the axial compressive strength of the concrete is small. Based on the influence of all factors,it is suggested that the early-age concrete compressive stress caused by construction sustained load should not be more than 50% of the axial compressive strength.
作者
庄金平
张三鹏
蔡雪峰
邱豪
Zhuang Jinping;Zhang Sanpeng;Cai Xuefeng;Qiu Hao(Cellege of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;Fujian Provincial Key Laboratory of Advanced Technology and lnformatization in Civil Engineering, Fuzhou 350118, China)
出处
《建筑科学》
CSCD
北大核心
2018年第5期50-55,共6页
Building Science
基金
国家自然科学基金(51478119)
福建省科技厅项目(2015J01182)
福建工程学院科研发展基金(GYZ15098)
关键词
早龄期混凝土
持荷轴压比
开始持荷龄期
轴心抗压强度
弹性模量
early-age concrete
sustained axial compression ratio
beginning loaded age
axial compressivestrength
elastic modulus
作者简介
庄金平（1978-），男，博士，副教授[联系方式]20177535@qq.com
