脱硫石膏用作干混砂浆矿物掺合料改性剂的研究

Study on the Use of Desulfurized Gypsum as Modifier of Mineral Admixtures in Dry-mixed Mortar

试验研究了脱硫石膏对改性粉煤灰与矿渣粉复合掺合料的性能影响,以及含脱硫石膏“低水泥-高掺合料”干混砂浆的结构性能。试验结果显示,改性后的矿物掺合料有利于提高干混砂浆的早期和后期强度,复合矿物掺合料的掺加量可达胶凝材料总量的50%以上,脱硫石膏最佳掺加量为5%~7%;改性矿物掺合料可改善砂浆内部结构,增加无害孔数量;配制的各种砂浆性能均能满足JG/T 2302007标准要求;与市场普通干混砂浆相比,成本下降10%以上。

The effects of desulfurized gypsum on the properties of modified fly ash and slag powder composite admixtures,and the structural properties of low-cement-high admixture dry-mixed mortar containing desulfurized gypsum were studied experimentally.The test results show that the modified mineral admixture is beneficial to improve the early and late strength of dry-mixed mortar.The addition amount is 5%~7%;the modified mineral admixture can improve the internal structure of the mortar and increase the number of harmless pores;the properties of the prepared mortar can meet the requirements of the JG/T 2302007 standard.Compared with mixed mortar,the cost is reduced by more than 10%.