与结构混凝土同寿命的永久模板性能试验研究

Experimental study on the performance of permanent formwork with the same life of structural concrete

为探索与结构混凝土同寿命保温模板的主要性能,以酚醛颗粒为骨料、水泥为胶结材料,以水泥用量、保温粉材用量、胶用量为变化参数,分别制作了3类用以测定导热系数和抗压强度的混凝土试件,以及与酚醛试件配合比及测试目的相同的、以玻化微珠为骨料的试件各1组,试验结果表明,酚醛颗粒混凝土试件导热系数在0. 040 8～0. 061 W·(m·K)^(-1)之间,抗压强度在0. 32～1. 32 MPa之间,符合GB/T 20473—2006之规定。酚醛颗粒试件保温性能好于同配合比玻化微珠试件。该成果可为保温模板设计提供依据,也可为外墙保温层材料选用提供新途径。

With the purpose to explore the main properties of thermal insulation formwork with the same life of structural concrete,three kinds of concrete specimens,using phenolic particles as aggregate and cement as cementing materials,were made based on different mixture ratios among cement,thermal insulation material and gel to identify the thermal conductivity and compressive strength.Regarding on the same purpose,three sets of specimens with vitrified microbeads as aggregate were made as well.The test results show that the thermal conductivity of phenolic particles concrete specimens is between 0.040 8~0.061 W(m·K)-1 and the compressive strength is between 0.32~1.32 MPa,which is consistent with the provisions of GB/T 20473-2006.For specimen with same mixture ratio,the thermal insulation performance of phenolic aldehyde particles is better than that of the vitrified microbead.This finding can provide a basis for the design of heat insulation formwork and enrich the material for exterior wall insulation.