بررسی تأثیر الیاف کاغذ باطله بر رفتار شکست تخته الیاف-گچ.

Fiber-gypsum board is a composite material, in which fiber is used as the reinforcement in the matrix of gypsum. The purpose of this research was to investigate the effect of adding different amounts of waste paper fibers on the strength, and the fracture behavior of fiber-gypsum board. For this purpose, zero, 5, 10, 15, 20, 25 and 35 percent gypsum was substituted by waste paper fibers in the mixture. The results of bending strength, internal bonding and moisture absorption after one month exposure to 100% relative humidity measurement showed that increasing the percentage of fibers up to 20% increased the mechanical properties. In general, using twenty percent fibers in the mixture increased the bending strength by 50% and the internal bonding was increase two and half times compared to the control samples. The load-displacement curve shows that the dosage of 5 to 15 percent of fibers does not change the fracture behavior of the fibergypsum board and exhibited brittle fracture as in control samples. While at higher dosage, the flexibility increases and the failure becomes ductile. Therefore, the best conditions in terms of strength, resistance, and flexibility was reached at 20% substitution of gypsum with waste paper fibers. [ABSTRACT FROM AUTHOR]