The influence of fly ash on the mechanical properties and durability of glass fiber-reinforced cement mortar
Glass fiber-reinforced cement mortar(GFRC)is a common fiber cement mortar.However,the alkaline environment produced in the cement hydration process corrodes glass fiber,resulting in poor durability of GFRC.Fly ash(FA)was used by partially replacing cement and incorporated into GFRC to improve its durability.The effects of FA content on the mechanical properties and dry shrinkage of GFRC were investigated.The effects of FA content on the durability of GFRC were in-vestigated through accelerated aging and sulfate resistance tests.The results show that the addition of FA could increase the late strength and significantly improve the durability of GFRC.This was because FA had volcanic ash effect and filling effect,and played a role in reducing the alkalinity and calcium hydroxide content of GFRC,thus reduced the corrosion of glass fiber.With the increase of FA content,the drying shrinkage of GFRC could be effectively reduced,but the early strength of GFRC containing FA was slightly decreased due to the low activity of FA.
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