基于废弃物利用的自保温墙体配套砂浆制备及性能研究

Preparation and Thermal Insulation Properties of External Wall Insulation Mortar System Using Solid Waste

采用淤泥陶砂、废弃加气混凝土结合传热系数小的玻化微珠为砂浆骨料,基于"复合化"思想,制备自保温墙体配套砂浆。采用正交实验探讨混掺砂浆的合理配比,控制4项参数:胶凝材料用量、陶砂(或废料)与玻化微珠体积比、硅灰取代量和胶粉掺量,以干容重、抗压强度、导热系数为考核指标,制备综合利废效果最佳的新型混掺复合保温砂浆。结果表明,陶砂玻化微珠复合砂浆导热系数0.16～0.29W/(m.K),随着陶玻比增大而增大,因此陶砂体积含量增加有利于提高保温性能,加气废料玻化微珠复合砂浆的导热系数0.10～1.14W/(m.K),与陶砂复合保温砂浆相比,有较大的降低。

Combining with vitrified micro bubbles（VB）,sludge ceramic sand（SC） and abandon aerated concrete（AC） were chosen in the paper as aggregate.Together with cementitious materials,novel external wall insulation mortar was prepared.Based on orthogonal method,the experiment was designed with four parameters： cementing materials dosage,SC/VB or AC/VB ratio,silica fume replacement ratio and rubber replacement ratio,and three key performance indicators： dry bulk density,compressive strength and thermal conductivity were test to check the performance of mortar samples.After synthetical design of the test,hybrid insulation mortar with optimal parameters and performances were produced,the thermal conductivity of sludge ceramic sand mortar is 0.16~0.29 W/（m·K）,and increasing with improvement of the SC/VB ratio,while thermal conductivity of abandon aerated concrete mortar is 0.10~0.14 W/（m·K）,it is lower than sludge ceramic sand mortar.They are expected to be promising insulation materials for building thermal insulation use.