玉米秸秆掺量对氯氧镁水泥复合保温材料性能的影响  

Effect of corn straw content on the properties of magnesium cement composite building materials

作　　者：王建恒[1] 田英良[1] 徐长伟[2] 戚红[2] 孙诗兵[1] 

机构地区：[1]北京工业大学,北京100124 [2]沈阳建筑大学,辽宁沈阳110168

出　　处：《新型建筑材料》2016年第5期87-90,共4页New Building Materials

基　　金：“十二五”国家科技支撑计划项目(2014BAL03B01-04)

摘　　要：研究了玉米秸秆掺量对氯氧镁水泥基建筑复合保温材料(C-MOC)力学性能、耐水性能、密度及导热系数的影响,通过XRD、SEM对C-MOC中氯氧镁水泥微观形貌和物相进行了分析。结果表明,当玉米秸秆掺量为20%时,C-MOC的性能最佳,密度为912 kg/m3,导热系数为0.236 W/(m·K),吸水率为33.64%,软化系数为0.61,28 d抗压强度为9.16 MPa,28 d抗折强度为5.72 MPa。玉米秸秆渗出液改变了氯氧镁水泥物相及形貌,由5·1·8相的针状结构转变为糖、酯包裹氯氧镁水泥的片状结构。In this paper, the effect of corn straw content on the mechanical properties,water resistance, density and thermal con- ductivity of building composite （C-MOC） with light insulation properties of magnesium cement based corn straw were studied, and mi- croscopic analysis of the phases and microstrneture of C-MOC were analyzed by SEM and XRD. The results show that： According to the performance index,the optimum content of corn stalk is 20%. The density is 912 kg/m3, the coefficient of thermal conductivi- ty is 0.236 W/（m.K）,the absorption rate is 33.64%,the softening coefficient is 0.61,the 28 d compressive strength is 9.16 MPa, and 28 d flexural strength is 5.72 MPa. The phase and shape of the magnesium cement were changed from needle shape to gel-like shape. The reason is that the sugar in exudate of corn straw coats 5·1·8 phase.

关 键 词：玉米秸秆 氯氧镁水泥 建筑保温材料 宏观性能 微观分析 

分 类 号：TU551.3[建筑科学—建筑技术科学]