EFFECT OF ELEVATED TEMPERATURE ON SOME PROPERTIES OF TECHNICAL GYPSUM REINFORCED BY CELLULOSE FIBER

N spite of the wide availability of gypsum called juss in Iraq, with a low cost, but it still used mainly as a finishing material in plastering. The present work aim is to study the effect of elevated temperate exposure on properties of cellulose fiber reinforced gypsum (FCG), namely (density, compressive strength, flexural strength and ultrasonic pulse velocity). Technical gypsum wa s exposed to elevated temperature (25, 200, 400 and 600°C) with two different exposure durations of (0.5 and 1 hours). Specimens were exposed to temperature and tested at age 28 days. The results indicate that Elevated temperatures and increasing of exposure duration had passively influenced on hardened properties of both plain and fiber reinforced gypsum.