Papyrus Press Advance Researches in Civil Engineering 2645-7229 1 1 2019 02 15 Effect of Mixing Rate of Plaster with Water on Properties of Gypsum Plaster 42 48 82738 10.30469/arce.2019.82738 EN Hajar Ahmadi Moghadam Assistant Professor, Department of Material Engineering, Shahrekord University, Shahrekord, Iran. Mozafar Jalili Masir B.Sc. of Material Engineering, Department of Material Engineering, Shahrekord University, Shahrekord, Iran. Zahra Bandani Torshaki B.Sc. of Material Engineering, Department of Material Engineering, Shahrekord University, Shahrekord, Iran. Ali Dehghan B.Sc. of Material Engineering, Department of Material Engineering, Shahrekord University, Shahrekord, Iran. Journal Article 2018 05 29 Gypsum plaster is a widely used building material, as it is inexpensive and mechanically strong and to make gypsum model for ceramics manufacture as modelling material. When in contact with water, calcined gypsum rehydrates through dissolution, nucleation and crystallization steps. In this work, the mixing rate of plaster with water was investigated on their effect on the properties of hardened gypsum pieces, focusing on the structure–function relationship. The mixing plaster with water was done at 120, 240, 360 and 600 rounds per minute with a constant water/ plaster ratio of 0.77. The results showed that with increasing mixing rate, the setting time decreased and the mechanical strength of the hardened piece increased. The apparent porosity, water absorption and water diffusion coefficient of the hardened piece decreased with increasing mixing rate. The microstructure of gypsum with the high mixing rate not only seems to be denser, with crystals interlaced, but also shows short crystals, which may improve the mechanical strength of the specimen. The higher mixing rate can lead to the higher rate of the nucleus formation, the smaller crystals and denser structure are formed. This material can have higher strength.   https://www.arce.ir/article_82738_a2934016078501af33db59ab3339f46a.pdf