新型砂轻混凝土的工作性和力学性能研究

Study on Workability and Mechanical Properties of New Sand Lightweight Concrete

针对装配式建筑中混凝土构件自重过大的问题,本文采用黑曜岩轻骨料,试验配制新型砂轻混凝土,研究和分析了新型砂轻混凝土工作性和力学性能的影响因素。结果表明:新型砂轻混凝土可采用绝对体积配合比设计方法;影响新型砂轻混凝土工作性和力学性能的最主要因素是水灰比和水泥掺量;在试验最佳配合比时,制备的干表观密度为1 500 kg/m3砂轻混凝土,在50℃下快速养护3 d,抗压强度可达47.2 MPa,抗折强度达6.9 MPa,能适应装配式建筑用预制构件轻量化和高强的发展要求。

In response to the problem of excessive self-weight of concrete components in prefabricated buildings,this study uses obsidian lightweight aggregate to experimentally prepare a new type of sand lightweight concrete,and analyzes the factors affecting the workability and mechanical properties of the new type of sand lightweight concrete.The results indicate that the absolute volume mix design method can be used for the new type of sand lightweight concrete.The main factors affecting the workability and mechanical properties of the new sand lightweight concrete are water-cement ratio and cement content.When testing the optimal mix ratio,the dry apparent density prepared was 1500 kg/m³for the sand lightweight concrete.Under rapid curing at 50℃for 3 days,it has a compressive strength of 47.2 MPa and a flexural strength of 6.9 MPa,which can meet the development requirements for lightweight and high-strength prefabricated components in prefabricated buildings.