【摘 要】
：
针对混凝土早期裂缝问题,对预拌混凝土进行早期收缩试验,确定试验使用装置、原材料和配合比,并制作试件进行早期收缩测量。对试件进行试验,得到龄期与混凝土应变的关系,并对
【机 构】
：
重庆大学土木工程学院,中建商品混凝土有限公司,
论文部分内容阅读
针对混凝土早期裂缝问题,对预拌混凝土进行早期收缩试验,确定试验使用装置、原材料和配合比,并制作试件进行早期收缩测量。对试件进行试验,得到龄期与混凝土应变的关系,并对试验结果进行分析。总结收缩发展初值阶段和收缩发展相对减缓两阶段特征,提出自由收缩估算建议公式。结果表明,建议公式计算值与实测值吻合较好。
According to the problem of early crack in concrete, the early shrinkage test of ready-mixed concrete is conducted to determine the device, raw material and mix ratio of test, and the specimen is made for early shrinkage measurement. The test is carried out on the test piece, and the relationship between the age and concrete strain is obtained. The test results are analyzed. Summarize the two stages characteristics of initial stage of contraction development and relative slowdown of contraction development, and put forward the formula of free contraction estimation. The results show that the calculated value of the proposed formula is in good agreement with the measured value.
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