摘要
玻璃纤维增强水泥砂浆(GFRC)是常见的纤维水泥砂浆。然而水泥水化过程中产生的碱性环境对玻璃纤维具有腐蚀作用,导致GFRC的耐久性较差。通过使用粉煤灰(FA)替代部分水泥,掺入GFRC中以提高其耐久性。试验考察了FA掺量对GFRC力学性能和干燥收缩率的影响,并通过加速老化和抗硫酸盐侵蚀试验来探讨FA掺量对GFRC耐久性的影响。结果表明,添加FA可以提高GFRC的后期强度并显著改善其耐久性。这是由于FA具有火山灰效应和填充效应,在降低了GFRC液相碱度及氢氧化钙含量方面发挥作用,从而减少了玻璃纤维的腐蚀;随着FA掺量增加,可有效降低GFRC干燥收缩率,但由于FA早期活性较低,使得含有FA的GFRC在早期强度方面略有下降。
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 investigated 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.
作者
吴鹏
陈海明
张亚东
秦子光
陈杰
WU Peng;CHEN Haiming;ZHANG Yadong;QIN Ziguang;CHEN Jie(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)
出处
《建井技术》
2024年第1期51-55,共5页
Mine Construction Technology
基金
国家自然科学基金资助项目(41440018,41672278)。
关键词
粉煤灰
玻璃纤维增强水泥砂浆
力学性能
耐久性
腐蚀
fly ash
glass fiber-reinforced cement mortar
mechanical properties
durability
corrosion
