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对32根梁式自密实混凝土试件进行三点弯曲持续加载,对测得梁体受拉区和受压区应变数据进行累加,得到自密实混凝土受拉徐变的发展特征曲线,并得到自密实混凝土梁拉压徐变比;研究了自密实混凝土养护龄期、水胶比和粉煤灰掺量对拉压徐变度比值的影响。通过试验结果的分析得到:无论是开放状态还是密封状态下,自密实混凝土拉伸徐变都略小于压缩徐变,除拉压基本徐变比随粉煤灰掺量的增大略微增加外,拉伸徐变与压缩徐变的比值随着养护龄期、水胶比和粉煤灰掺量的增大而减小;最后拟合得到拉压徐变比值的计算式,为工程应用提供一定的参考。
32 beam self-compacting concrete specimens were subjected to three-point bending loading continuously, and the measured strain data of the tension and compression zones of the beam body were summed up to obtain the development curve of tensile and creep of self-compacting concrete, Compact concrete beam tension creep ratio; self-compacting concrete curing age, water-cement ratio and the amount of fly ash on the tension and compression creep ratio. Through the analysis of the test results, it is found that the tensile creep of self-compacting concrete is slightly less than that of compression creep in either open or sealed condition, except that the basic creep ratio of pultrusion increases slightly with the increase of fly ash content, The ratio of tensile creep to compression creep decreases with the increase of curing age, water-cement ratio and fly ash content. Finally, the formula of tension-compression creep ratio is obtained, The reference.