稻草纤维复合水泥制备墙体保温材料的研究

Study on Insulation Wall Materials Prepared by Straw Fiber Composite Cement

将稻草纤维与水泥复合制作墙体保温材料,研究了稻草纤维浸提物、稻草纤维长度、掺量对复合材料性能的影响。试验结果表明,稻草纤维在水中或碱性溶液中浸泡会溶解出浸提物,这些浸提物对水泥的初凝缓凝效果明显,对终凝缓凝作用较小;稻草纤维长度在4~12mm变化时,长度越小,复合材料强度越高,导热系数越小,干密度也较小;稻草纤维掺量从3%增加到5%,掺量越多,复合材料导热系数越小,干密度越低,但强度降低。复合墙体保温材料的干密度与吸水率成反比。

The insulation walt materials are prepared for straw fiber and cement, the influence of straw fiber extracts, straw fiber length and dosage on properties of composite materials is studied.The results show that straw can dissolve ex- tracts in water or alkalin solutions, retarding effects for initial setting time of extracts on cement is obvious, extracts have less retarding effects for final setting time. The variation of straw fiber length is 4-12mm, the less length,the higher strength of composite materials, the smaller thermal conductivity, the lower dry density; the dosage of straw fiber increases from 3% to 5%, the more dosage, the smaller thermal conductivity of composite materials, the lower dry density, however, the strength is decreased. The dry density of composite insulation wall materials is inversely proportional to water absorption.