This study was carried out to determine the shrinkage percentage of natural plaster materials consisted of soil, sand and different fibers. Straw was used as a reinforcement fiber for plaster and three types of fibers. The plaster materials were put under drying temperatures of 30℃, 50℃ and 70℃. The results revealed that the highest shrinkage was for plaster reinforced by wood shavings fibers, while the lowest shrinkage was for plaster reinforced by barley straw fibers for treatments A, B and C. Also, the plaster without reinforcement fibers had a lot of cracks and problems that destroyed plaster. The reinforcement fiber had a greater effect on the drying shrinkage than sand. The study indicates that drying the plaster at 30℃ with a lot of straw can decrease the shrinkage and cracks.
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