At present, the utilization rate of gypsum in China is only 50%. Gypsum is mostly used for interior decoration and sometimes as cement retarder. Because of the poor performance of traditional cement mortar, cracking, expansion, shedding and other phenomena occur, gypsum mortar can improve this defect. However, there are still many misunderstandings in the research of gypsum mortar, such as strength, consistency loss, water resistance and so on. In recent years, the strength, fluidity and consistency loss of gypsum mortar can be improved by adding a small amount of cement and mineral admixtures to gypsum mortar. It solves the problems of poor fluidity, low strength and loss of consistency of gypsum mortar, and has good development prospects.

　　结果表明，用粉煤灰代替水泥可以提高石膏砂浆的流动性。水泥掺量小于15%时，28天内无明显裂缝。其中粉煤灰或矿渣:增强材料:引发剂:保水剂=(80-90):(5-7):(2-13):(2-5):(0.1-0.3)，石膏砂浆性能满足标准要求。

　　The results show that the fluidity of gypsum mortar can be improved by using fly ash instead of cement. When the cement content is less than 15%, there is no obvious crack in 28 days. Among them, fly ash or slag: reinforcing material: initiator: water retaining agent = (80-90): (5-7): (2-13): (2-5): (0.1-0.3). The performance of gypsum mortar meets the standard requirements.

　　对掺加矿渣的石膏砂浆的物理力学性能研究表明，当掺加10%、20%、30%、40%、50%矿渣时，矿渣在砂浆中的含量与用水量成反比。在满足砂浆标准的前提下，掺30%矿渣的石膏砂浆具有高的抗折抗压强度和佳的保水性。研究了水泥对石膏砂浆物理力学性能的影响，结果表明，水泥掺量越大，水泥的固井能力越强。用适量的水泥代替石膏，不仅可以改善石膏砂浆的性能，而且可以节约成本，对其应用具有很大的效益。

　　The study on physical and mechanical properties of gypsum mortar with slag shows that the content of slag in mortar is inversely proportional to water consumption when 10%, 20%, 30%, 40% and 50% slag is added. On the premise of meeting the mortar standard, gypsum mortar with 30% slag has the highest flexural compressive strength and the best water retention. The effect of cement on the physical and mechanical properties of gypsum mortar is studied. The results show that the larger the cement content, the stronger the cementing ability of cement. Replacing gypsum with appropriate amount of cement can not only improve the performance of gypsum mortar, but also save cost, which has great benefits for its application.

　　研究矿物掺合料对石膏砂浆性能的影响表明，水泥粉煤灰掺合砂浆3天强度无明显变化，但28天强度高，其次为粉煤灰掺合砂浆。粉煤灰和矿粉掺量越多，石膏砂浆凝结时间越长，具有一定的缓凝效果。然而，水泥恰恰相反。微观分析表明，石膏的快速凝固时间导致矿物掺合料的反应较少，石膏的快速凝固速度阻碍了其他物质的化学反应，从而影响石膏砂浆的强度。

　　The effect of mineral admixtures on the properties of gypsum mortar was studied. The results showed that the strength of cement-fly ash-mixed mortar did not change significantly in 3 days, but the strength of 28 days was the highest, followed by fly ash-mixed mortar. The more fly ash and mineral powder are added, the longer the setting time of gypsum mortar is, which has a certain retarding effect. However, cement is the opposite. Microscopic analysis shows that the rapid solidification time of gypsum leads to less reaction of mineral admixtures, and the rapid solidification speed of gypsum hinders the chemical reaction of other substances, thus affecting the strength of gypsum mortar.

　　通过双混合水泥和粉煤灰、水泥和双混合矿物粉,混合水泥、粉煤灰和矿物粉,如测试,确定石膏浆混合复合水泥和矿物掺合料的佳配方,研制了满足设计要求的石膏浆,其索引的范围可以达到一致性(80 + 10)毫米,水率为80%或更高灵敏度3.0 MPa,七天三天抗压强度,抗压强度≥7.0 MPa。

　　The optimum formula of gypsum slurry mixed cement and mineral admixture is determined through testing of double mixing cement and fly ash, cement and double mixing mineral powder, mixed cement, fly ash and mineral powder. The gypsum slurry which meets the design requirements is developed. The index range of gypsum slurry can reach consistency (80+10) mm, and the water rate is 80% or higher. Sensitivity 3.0 MPa, compressive strength 7 days and 3 days, compressive strength (> 7.0 MPa).

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