Effect of Mix Proportion on Coefficient of Thermal Expansion of Concrete
Effect of Mix Proportion on Coefficient of Thermal Expansion of Concrete
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发表时间：
2007
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通讯作者：
Zheng Xin
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作者：
Zheng Xin
混凝土的热膨胀系数是衡量混凝土体积稳定性的重要指标之一。采用正交试验设计的方法，研究了配合比对混凝土体积稳定性的影响。对实验室批混凝土试件在1、2、3、5、7、14、28天进行了润湿试验。结果表明，混凝土的热膨胀系数随着用水量和灰集料比的增加而增大。在用水量一定的情况下，混凝土的热膨胀系数随水灰比的增加而减小，当水泥含量固定时，热膨胀系数随水泥含量的增加而增大。混凝土的热膨胀系数在相对湿度为75%时达到最大值，利用数值系数对正交试验结果进行分析，可确定最佳配合比。
The coefficient of thermal expansion(CTE) is one of the most important indexes to volume stability of concrete.The method of orthogonal experimental design is adopted to study the effect of mix proportion on CTE of concrete.The laboratory-batched concrete specimens were moistured and tested at 1,2,3,5,7,14,28 days.The results show that CTE of concrete increases with the amount of water and paste-aggregate ratio.When the amount of water is fixed,CTE reduces with the increasing of water-cement ratio and increases when cement content is fixed.At first,the CTE changes dramatically,but 28 days later,it approaches a stable value.The CTE of concrete is subjected to moisture conditions at measurement,and reaches a maximum at relative humidity of 75%.The optimized mix proportion can be determined by using value coefficient to analyze the orthogonal results.