掺和辉绿岩石粉制备高性能玻化微珠保温砂浆正交试验研究

Orthogonal experimental study on preparation of high performance vitrified bead thermal insulation mortar with diabase powder

辉绿岩石粉作为固体废弃物的一种,将其加入保温砂浆中即可促进该废弃物的有效利用同时可以节约制备成本。将工业废料辉绿岩石粉加入玻化微珠保温砂浆中,研究砂浆各组分对砂浆抗压强度、抗折强度、黏结强度、导热系数和稠度的影响,并通过设定保温砂浆工作性能综合评价指标体系,引入层次分析法确定其最优配合比。试验结果表明:无机保温砂浆导热系数随石粉掺量的增加呈先增大后减小的趋势;当石粉掺量增加至10%时,砂浆抗压强度降幅最大,由1 140 kPa降低至361 kPa,但随着石粉掺量的持续增加,抗压强度在一定范围内呈增大趋势;石粉可以改善砂浆的流动性,掺量增加到10%后,稠度增加31 mm;石粉和粉煤灰均会对砂浆的黏结强度产生不利影响,黏结强度随其掺量的增加呈持续下降趋势。综合考虑各性能指标后,得到砂浆最佳配合比为:水料比1、胶砂比1、胶粉2%、粉煤灰15%、石粉10%,所配砂浆的黏结强度为818.46 kPa,抗压强度为1 509.82 k Pa,导热系数为0.07 W/(m·K),各项指标均显著优于国家标准中的砂浆性能指标。

As a kind of solid waste,adding diabase powder into thermal insulation mortar can promote the effective utilization of the waste and save the preparation cost.The industrial waste diabase powder is added into the vitrified micro bead thermal insulation mortar to study the influence of each component of the mortar on the compressive strength,flexural strength,bonding strength,thermal conductivity and consistency of the mortar.The optimal mix proportion is determined by setting the comprehensive evaluation index system of the working performance of the thermal insulation mortar and introducing the layer analysis method.The experimental results show that the thermal conductivity of inorganic thermal insulation mortar increases first and then decreases with the increase of stone powder content.When the content of stone powder increases to 10%,the compressive strength of mortar decreases the most,from 1 140 k Pa to 361 k Pa,but with the continuous increase of the content of stone powder,the compressive strength increases in a certain range.Stone powder can improve the fluidity of mortar.When the content of stone powder increases to 10%,the consistency increases by 31 mm.Both stone powder and fly ash have adverse effects on the bond strength of mortar,and the bond strength continues to decline with the increase of their content.After comprehensive consideration of various performance indexes,the optimum ratio of mortar is obtained as follows water to material ratio 1,cement sand ratio 1,rubber powder 2%,fly ash 15% and stone powder 10%.The bonding strength,compressive strength and thermal conductivity of the mortar are 818.46 k Pa,1 509.82 k Pa and 0.07 W/(m·K),which are significantly better than those in the national standard.