免煅烧石膏-矿渣-棉花秸秆砌块的制备

Preparation for Non-calcined Gypsum-slag-cotton Straw Blocks

研究了氢氧化钠和复合激发剂CSN对脱硫石膏-矿渣胶结料强度的影响以及棉花秸秆对材料强度、导热系数和表观密度的影响,并制备了石膏砌块。试验结果表明,复合激发剂CSN对胶结料强度的改善效果优于氢氧化钠,28d最高抗折强度和抗压强度分别达到6.2MPa和46.5MPa;在其中添加棉花秸秆后,随着棉花秸秆掺量的增加,试样的强度、导热系数和表观密度都不断减小。当在70%原状脱硫石膏和30%矿渣中,添加4%CSN复合激发剂和10%棉花秸秆时,其抗折和抗压强度分别达2.1MPa和9.1MPa,导热系数达0.134 W/m·K;由其制备的砌块抗折载荷为3056N,表观密度为975kg/m3。

The gypsum block was prepared by the original desulphurization gypsum as raw materials, a little slag, some activators and cotton straw. The influence of NaOH and compound stimulator CSN on the strength of desulphurization gypsum-slag system was discussed. And the effect of the cotton straw on the strength, thermal conductivity and apparent density of the material was also studied. The results show that the effect of CSN on the strength of the binder is better than that of NaOH. The 28d flexural strength and compressive strength of the cementitious materials are 6.2MPa and 46.5MPa respectively. Furthermore, the strength, thermal conductivity and apparent density of the specimens decrease with increasing the content of cotton straw. When adding 4% CSN and 10% cotton straw to the mixture of 70% original desulphurization gypsum and 30% slag, the flexural strength and compressive strength of the specimen are 2.1MPa and 9.1MPa respectively, and its thermal conductivity is 0.134 W/m·K. In addition, the fracture load and the apparent density of the block prepared by using the optimum proportion are 3056N and 975 kg/m3respectively.