Abstract
The effect of E-type glass fibre on the strength and durability of gypsum binder composites was studied under different climatic conditions and by accelerated methods. After 50 cycles of wetting and drying at 60°C an irregular deposition of gypsum binder products was found at the surface of glass fibres. Durability of E-type glass (borosilicate) fibres employed as reinforcement in the gypsum binder composites was examined after immersion into aqueous extract of gypsum binder at temperature 27° to 60°C. The exposed glass fibres were studied by scanning electron microscope and by weight loss determination. Deterioration of E-type glass fibres was observed at 50° and 60°C on exposure to aqueous gypsum binder extract which is directly related to the durability of gypsum binder composites. It is concluded that gypsum binder composites should be used under 50°C.
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