摘要
普通钢筋混凝土结构一般都是带裂缝工作,裂缝的存在会使CO_2更易侵入混凝土内部,加速混凝土的碳化,对结构的耐久性不利。结合已有研究成果,定义了裂缝对混凝土碳化的影响系数γc,通过对预制裂缝的砂浆及混凝土试件进行碳化试验,分析了水灰比、碳化时间、环境相对湿度、裂缝宽度、裂缝深度对γc的影响,得出裂缝处混凝土碳化深度计算模型,并通过实际工程进行了验证。结果表明,裂缝宽度范围为0.06~0.7mm时,模型均适用,且桥梁运营时间对γc影响不显著。
Reinforced concrete structures generally work with cracks.Base on the studies at home and abroad,a crack influence coefficient about concrete carbonationγc,is defined. Mortar and concrete specimens with prefabricated cracks have been made for carbonation test.And the effect of water cement ratio,carbonation time,environment relative humidity,crack width,crack depth onγcis analyzed.A calculation model about carbonation depth in concrete cracks is obtained.Actual projects have been implemented to validate the model.It is shown that the model is applicable when the width of cracks in the range of 0.06~0.7mm,and the bridge operation time have no significant effect onγc.
出处
《土木建筑与环境工程》
CSCD
北大核心
2017年第5期71-78,共8页
Journal of Civil,Architectural & Environment Engineering
基金
河北省交通运输厅科技计划项目(Y-2012047)~~
关键词
钢筋混凝土结构
裂缝
碳化
计算模型
reinforced concrete structures
crack
carbonation
calculation model
