体表比对混凝土开裂风险的影响研究  

Study on effect of volume-surface area ratio on the cracking risk of concrete

作　　者：胡兵 刘加平[2,3] 刘建忠[3] 

机构地区：[1]宿迁市建设工程质量检测中心有限公司,江苏宿迁223800 [2]南京工业大学,江苏南京210008 [3]江苏省建筑科学研究院,江苏南京210008

出　　处：《混凝土》2011年第3期133-135,共3页Concrete

基　　金：江苏省泰州大桥工程项目

摘　　要：研究了体表比对混凝土干燥收缩的影响以及混凝土轴向抗拉强度和弹性模量与龄期的关系,建立了混凝土收缩预测公式,计算了混凝土内部收缩应力,评价了体表比对混凝土开裂风险的影响。结果表明:混凝土轴向抗拉强度和弹性模量与龄期均成双曲线关系,且相关性较高。随着试件体表比的降低,混凝土的干燥收缩值增加,内部收缩应力增大,其开裂风险提高。Effect of volume-surface area ratio on the drying shrinkage, the relationship between axial tensile strength and elastic modulus of concrete and ages were studied.The internal shrinkage stress of concrete was calculated, and effect of volume-surface area ratio on the cracking risk of concrete was evaluated.Results showed that the relationships between axial tensile strength and elastic modulus of concrete and age were hyperbolic function with the high correlation.With the volume-surface area ratio of specimen decreased, the drying shrinkage, the internal shrink- age stress and the cracking risk of concrete increased.

关 键 词：体表比 干燥收缩 收缩应力 开裂风险 

分 类 号：TU528.01[建筑科学—建筑技术科学]