水泥基不燃性轻质保温材料制备的研究

以水泥为主要原料制成的密度小于300 kg/m3的泡沫混凝土,是一种新型外墙外保温材料。采用硅酸盐水泥为主要原料在实验室研究了这种材料的制备方法,并系统地研究了几种混凝土外加剂对该材料制备过程及其性能的影响。结果表明,以硅酸盐水泥为主要原料,并适量添加适宜的混凝土外加剂,可以制得性能优良的低密度泡沫混凝土;其中,几种外加剂的适宜掺量分别为:早强剂1.8%,促凝剂0.8%;聚丙烯纤维0.8%～1.0%;憎水剂0.1%～0.2%,苯丙乳液0.3%～0.4%。在此最佳条件下制得泡沫混凝土的干密度为290 kg/m3,28 d抗压强度可达1.1 MPa,吸水率为6.11%,导热系数为0.07 W(/m.K)。

Study on the preparation of cement based nonflammable lightweight thermal insulation material

A foamed concrete,made from cement as its main component and with its density less than 300 kg/m3,is a novel insulation material for exterior wall.The preparation method of this material was studied in the laboratory with Portland cement as its main raw material,and the influence of some chemical admixtures on the preparation process and the properties of the resultant material were carried in laboratory systematically.Results show that high performance and low density foamed concrete can be prepared with Portland cement as its main raw material and with aid of proper addition of some chemical admixtures,among which the appropriate dosage of the chemical admixtures are as follows: strengthening agent 1.8%,setting accelerator 0.8%,polypropylene fiber 0.8%～1.0%,hydrophobic agent 0.1%～0.2% and styrene-acrylic emulsion 0.3%～0.4%.Foamed concrete with dry density 290 kg/m3 prepared under that optimum condition presents its 28 day age compressive strength 1.1 MPa,water absorption rate 6.11% and thermal conductivity 0.07 W/(m·K).