吉林大学学报(工学版) ›› 2020, Vol. 50 ›› Issue (2): 648-653.doi: 10.13229/j.cnki.jdxbgxb20190006

• 交通运输工程·土木工程 • 上一篇    

湿热养护时掺合料对玻纤增强水泥性能的影响

何娟1(),程从密1(),杨毅男1,张亚芳1,钟明峰2   

  1. 1.广州大学 土木工程学院，广州 510006
    2.华南理工大学 材料科学与工程学院，广州 510640
  • 收稿日期:2019-01-04 出版日期:2020-03-01 发布日期:2020-03-08
  • 通讯作者: 程从密 E-mail:10319919@qq.com;congmi2008@sina.com
  • 作者简介:何娟（1977-）,女,讲师，博士.研究方向:环境友好材料.E-mail:10319919@qq.com
  • 基金资助:
    国家自然科学基金项目(51678170);广州市重点实验室项目(201509010016)

Effect of admixture on properties of GRC under hydrothermal curing conditions

Juan HE1(),Cong-mi CHENG1(),Yi-nan YANG1,Ya-fang ZHANG1,Ming-feng ZHONG2   

  1. 1.School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
    2.School of Materials Science & Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2019-01-04 Online:2020-03-01 Published:2020-03-08
  • Contact: Cong-mi CHENG E-mail:10319919@qq.com;congmi2008@sina.com

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摘要：

采用80 ℃湿热养护的加速老化方法，通过力学性能和微观分析研究掺合料对玻璃纤维增强硅酸盐水泥（GRC）中玻璃纤维腐蚀的影响。研究表明，GRC力学性能的经时变化是砂浆强度增长和玻璃纤维腐蚀破坏共同作用的结果，随着养护时间的延长，粉煤灰一方面使砂浆强度保持增长，另一方面抑制了玻璃纤维腐蚀，结果是玻璃纤维腐蚀减轻，GRC抗弯强度保持上升。玻璃纤维的轻微腐蚀会使其呈脆性破坏，而纤维间和周围的水化产物形成也导致其失去增韧作用，因而用韧性的变化评价GRC的退化比用强度变化来评价更有效。

关键词: 建筑材料, 湿热养护, 玻璃纤维增强水泥, 掺合料, 腐蚀, 韧性, 粉煤灰

Abstract:

The corrosion of glass fiber and time-dependent change of mechanical properties of glass fiber reinforced Portland cement (GRC) with or without admixture were studied by accelerated aging method with 80 ℃ hydrothermal curing. The results show that the time-dependent change of GRC mechanical properties is caused by the combined effect of cement mortar strength growth and glass fiber corrosion damage. With the extension of curing time, on the one hand, the strength of cement mortar with fly ash keeps increasing; on the other hand, fly ash inhibits the corrosion of glass fiber. As a result, the bending strength of GRC with fly ash keeps rising despite the corrosion of glass fiber. Accelerated aging test showed that the inhibition effect of fly ash on glass fiber corrosion is better than slag. It exhibited a brittle behaviour with slight corrosion of glass fiber. Hydrating phases within and around glass fibers will lead to the loss of toughening effect. So, it is more effective to evaluate degradation of GRC by the change of GRC toughness than by the change of strength.

Key words: building materials, hydrothermal curing, glass fiber reinforced cement, mineral admixture, corrosion, toughness, fly ash

中图分类号: 

  • TU528.581

表1

GRC和基准砂浆的配合比"

样品编号配合比/(kg·m-3)
水泥粉煤灰矿渣砂玻璃纤维水
SF11 0000094060360
SF2600400094060360
SF3600040094060360
S11 000001 0000360
S260040001 0000360
S360004001 0000360

图1

GRC抗弯强度与湿热养护时间关系"

图2

不同湿热养护龄期时无掺合料GRC中的玻璃纤维形貌"

图3

不同湿热养护龄期时掺粉煤灰GRC中的玻璃纤维形貌"

图4

不同湿热养护龄期时掺矿渣GRC中的玻璃纤维形貌"

图5

不同养护条件下GRC的荷载-挠度曲线"

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