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本文研究了HME膨胀剂对混凝土干缩收缩、自干燥收缩、轴向抗拉强度、弹性模量和圆环开裂的影响,系统评价了膨胀剂对混凝土收缩开裂性能的影响规律。结果表明:HME膨胀剂能显著提升补偿收缩混凝土的抗开裂性能,在干燥养护条件下,HME膨胀剂的掺入对混凝土的干燥收缩表现出明显的抑制效果,显著推迟混凝土圆环干燥开裂时间和初裂宽度;在密封养护条件下,HME膨胀剂的掺入能完全消除混凝土的早期自干燥收缩,产生自膨胀;在标准养护条件下,HME膨胀剂的掺入对混凝土的轴向抗拉强度有一定的提升作用,对混凝土的弹性模量无明显影响,改善了混凝土脆性,提高了混凝土的抗裂性。
In this paper, the effect of HME expansive agent on concrete shrinkage and shrinkage, self-drying shrinkage, axial tensile strength, elastic modulus and ring cracking were investigated. The influence of expansive agent on the shrinkage and cracking behavior of concrete was systematically evaluated. The results show that: HME expansive agent can significantly improve the anti-cracking performance of shrinkage-compensated concrete. The incorporation of HME expansive agent significantly inhibits the drying shrinkage of concrete under dry curing conditions, significantly delays the dry cracking time of concrete ring and Initial crack width; under sealed curing conditions, the incorporation of HME expansive agent can completely eliminate the early self-drying concrete shrinkage, resulting in self-expansion; under standard curing conditions, the incorporation of HME expansion agent on the concrete axial tensile strength Have a certain role in promoting, the elastic modulus of concrete had no significant impact on improving the brittleness of concrete and improve the crack resistance of concrete.