砌块用轻集料混凝土的性能研究

Study the properties of lightweight aggregate for make the block

利用多微孔轻集料、建筑固体废弃物作集料,水泥和粉煤灰、脱硫石膏、电石渣等工业废渣作复合胶凝材料制备轻集料混凝土,对其力学性能、抗冻和耐高温性能进行研究。实验结果表明:轻集料混凝土密度等级为1500 kg/m3时,强度等级达到LC20,抗冻标号均达到F15,符合非采暖地区抗冻要求;显示出良好的耐高温性能,在400℃时实验样品的抗压强度没有下降,甚至略高于标准养护条件下28 d抗压强度值。在此基础上制备了具有自保温功能的轻集料混凝土小型空心砌块,其体积密度为940 kg/m3,抗压强度为5.4 MPa,砌筑墙体传热系数为1.26 W(/m2.K)。

In this paper, the multi-porous lightweight aggregate and construction of solid waste were used as aggregate,cement and fly ash,gypsum, calcium carbide slag and other industrial waste were used as composite cementitious material,to make lightweight aggregate concrete. And study its mechanical properties,its frost resistance and high temperature performance. The results show that the lightweight aggregate concrete＇s compressive strength level up to LC20,when the density level keep in 1500 kg/m3;t.he antifreeze experimental results show that the antifreeze label reach F15,in line with the non-heating area antifreeze requirements;The lightweight aggregate concrete shows good resistance to high temperature. The high temperature performance experimental results show that the compressive strength of lightweight aggregate concrete after high temperature of 460 ℃ is not drop, some of the samples is still higher than the 28 d compressive strength under the standard conditions of curing. On this basis, lightweight aggregate concrete small hollow block with insulation function is made,its density is 940 kg/m3,the compressive strength is 5.4 MPa,when laying into wall the heat transfer coefficient is 1.26 W/（m2·K）.