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以徐变度和干燥收缩应变为评价指标,对高强自密实混凝土与普通泵送混凝土进行徐变和收缩特性研究,并分析其与混凝土配合比之间的联系。研究表明:混凝土的徐变度随其强度等级的提高而降低,同样强度等级的自密实混凝土比普通泵送混凝土的徐变度大。研究表明:开始加载龄期延长可降低混凝土的徐变度,高强混凝土的干燥收缩规律与其徐变类似,凡是使徐变增大的因素也会使混凝土的干燥收缩增大;掺加高吸水性树脂的高强自密实混凝土的早期徐变度增长快,但是后期徐变发展速度明显降低,表明其可改善高强混凝土结构的长期变形性能。
Taking the creep and the shrinkage of dry as the evaluation indexes, the creep and shrinkage characteristics of high-strength self-compacting concrete and ordinary pumping concrete were studied, and the relation between them and the concrete mix ratio was analyzed. The results show that the creep degree of concrete decreases with the increase of its strength level, and the creep degree of self-compacting concrete with the same strength level is higher than that of ordinary pumping concrete. The results show that creep of concrete decreases with the increase of loading age, and the dry shrinkage of high-strength concrete is similar to that of creep. All the factors that make creep increase also increase the drying shrinkage of concrete. The early creep of high-strength and self-compacting concrete increased rapidly, but the rate of creep development at the later stage decreased obviously, which indicated that it could improve the long-term deformation performance of high-strength concrete structure.