Effect of Adding Various Fibers on Some Properties of Gypsum
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Due to the availability, high tensile strength, cheapness, recyclability, and eco-friendly characteristics of the plant fibers, there is an interest nowadays for using them in the construction materials in order to improve the weak properties of several construction products and works. In this study, two types of plant fibers (sisal and hemp) have been added to pure gypsum in order to study their effects on some gypsum properties. Different volumetric percentages (0.3, 0.6, 0.9, 1.2 %) of each fiber type have been added to gypsum in order to produce several mixes. Moreover, silica fume has been added alone to gypsum with percentages of 1, 1.5, 3, 5 % by weight of gypsum, and it has been added to the mixes with the sisal fibers in order to study their common effect. A 5 cm cube specimen and prisms with dimensions of 5×5×30 cm have been used for testing the compressive strength and modulus of rupture respectively and for various curing periods of (2, 7, 30, 90) days. The results show that the addition of hemp and sisal fibers with percentages of no more than 0.3% for hemp and 0.6% for sisal can improve the compressive strength and the modulus of rupture of gypsum products.
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