In this article, poly methyl triethoxy silane was compounded with an inorganic waterproof admixture at a certain ratio to improve the performance of gypsum products; a new type of high-efficiency compound water-proofing additive was also investigated. Furthermore, the waterproof mechanism and the various properties on the hardened gypsum plaster were investigated in detail by XRD and SEM. The results show that the intenerate coefficient of gypsum plaster increased to more than 0.9; the water absorbing rate decreased to less than 10 %. Both the bending strength and the compressive strength of gypsum plaster increased by various degrees. The intenerate coefficient reached a maximum value of 0.73 and the strength of the samples showed almost no change when 5 % cement alone was added. In this new type of the high-efficiency compound with waterproof additive, the optimal technological parameters for formulas were obtained to be: 5 % cement, 18 % mineral powder, and 0.8 % poly methyl triethoxy silane, to compound gypsum plaster. Meanwhile, the production of high performance gypsum as a building material has become possible.

1. Introduction
2. Materials and Characterization
3. Results and Discussion
4. Waterproof Mechanism
5. Conclusions
Acknowledgments
References

• Won-Chun Oh(Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 356-706, Korea) Corresponding Author
• Qicai Zhang(Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei Anhui 230022, P R China)
• Hui Fang(Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei Anhui 230022, P R China)
• Qifang Ren(Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei Anhui 230022, P R China) Corresponding Author
• Youchun Fang(Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei Anhui 230022, P R China, JinChuan Waterproofing Group Company, Hefei Anhui 230601, P R China)
• Yi Ding(Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei Anhui 230022, P R China)