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

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 construction operability and early mechanical properties.