配合比参数对脱硫灰磷酸盐快速修复材料性能的影响

Effect of Mix Proportion on the Properties of Phosphate-based Rapid Repairing Material With Desulfurized Fly-ash

为解决混凝土结构快速修复及脱硫粉煤灰的资源化利用,提出利用脱硫粉煤灰、凝灰岩机制砂制备磷酸盐快速修复材料(MKPC).采用单因素试验方法研究了30℃高温下配合比参数对流动性、凝结时间和力学性能的影响,结合功效系数法确定满足多项指标的优化配合比参数.试验结果表明:MKPC流动度随着碱酸比、硼砂用量、水胶比、砂胶比及脱硫灰掺量的增大,依次呈抛物线型增加、指数衰减、线性增加、指数增长及指数衰减的变化规律;凝结时间随着碱酸比的增加呈线性递减变化,随硼砂用量、水胶比及脱硫灰掺量的增加呈指数增长型变化规律;1 h力学性能随着脱硫灰掺量的增加呈线性递减变化,随硼砂用量、水胶比及脱硫灰掺量的增加呈抛物线型变化规律.优化出的MKPC体系配合比参数满足快速修复现场施工要求.

Phosphate cementitous material was considered as ideal rapid repairing materials owing to its excellent properties. However,its application was limited due to its shorter setting time and high cost.Phosphate-based rapid repairing material（ MKPC） was prepared with desulfurization fly ash and tuff machine-made sand. Meanwhile the method of single-factor experimental design was adopted to study the effect of mix proportion on the properties of MKPC under high temperature conditions（ 30 ℃）. The optimized mix proportion was determined by using value coefficient. The results show that the fluidity of MKPC demonstrates the parabola changes with M/P ratio,exponential decay with B/MPF ratio,linear growth with W/MPF ratio,exponential growth with S/MPF ratio,and exponential decay with CFB/MPF ratio. Secondly,the setting time of MKPC decreases linearly with the ratio of M/P,and increases with the ratio of B/MPF,W/MPF and CFB/MPF according to an exponential growth model. Thirdly,the mechanical property of MKPC about an hour declines linearly with the ratio of M/P,and improves with the ratio of B/MPF,W/MPF and CFB/MPF according to a parabola model. Finally,the optimized mix proportion is determined by using value coefficient,which meets the control range of the constructionoperability and early mechanical properties.