Research on the Waterproof Properties of Lightweight Gypsum Materials

Abstract:

In this work, methods of introducing water-resistance to foamed gypsum were firstly adopted to investigate the influences of sulphoaluminate cement、redispersible latex powder and stearic acid emulsion on the mechanical strength、water absorption and softening coefficient. Scanning electron microscopy (SEM) was conducted to investigate microstructure of gypsum and phase composition of substances on plaster surface as well as the mechanisms. The result showed that sulphoaluminate cement reduced the water absorption of foamed gypsum, which decreases to 38.9% when dosage was 10%; Redispersible latex powder reduced the water absorption of foamed gypsum, which decreases to 35.6% when dosage was 5%; Stearic acid emulsion reduced the water absorption of foamed gypsum, which decreased to 30.1% when dosage was 3%; The combing use of sulphoaluminate cement、redispersible latex powder and stearic acid emulsion maked the water absorption decrease to 15.2% and the crystals became short and dense and a layer of organic hydrophobic membrane covered the surface of crystals and which makes gypsum less soluble and more suitable for use in humidity environment.

• Periodical: Applied Mechanics and Materials (Volumes 548-549)
• Pages: 1655-1658
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.548-549.1655
• Online since: April 2014
• Authors: Lin Lin Li, Guo Zhong Li*
• Keywords: Compound Waterproof, Foamed Gypsum, Water Resistance

References

[1] Ma Hong-xia: Gansu Science and Technology, 2009, 25(18): 112-114.

[2] Zhuang Jian-ying: Building Energy Efficiency, 2005, (7): 47-49.

[3] Zhang Ju-song, Gao Fei and Hui Zhi-feng: : New Building Materials, 2005, (5): 27-30.

[4] Zheng Jin-cui, Sun Zhen-ping and Pang Min: Shanghai Building Materials, (2010), pp.54-58.

[5] Zhang Jie, Shi Zong-li and Wu Kan-xuan: New Building Materials, 2006, (10): 19-21.

[6] Liu Run-zhang: Northwest Minorities University, 2000, 21(1): 28-31.