Journal of South China University of Technology (Natural Science Edition) ›› 2020, Vol. 48 ›› Issue (9): 43-50.doi: 10.12141/j.issn.1000-565X.190907

• Architecture & Civil Engineering • Previous Articles     Next Articles

Experimental Study on Geopolymer Grouting Material in Rapid Grouting Reinforcement of Fractured Rock

FENG Han1,2 ZHANG Xuemin1,2 OU Xuefeng3 ZHANG Cong4 JIANG Jian5 GUO Tengfei5 ZHOU Xianshun1,2   

  1. 1． School of Civil Engineering，Central South University，Changsha 410000，Hunan，China;2． MOE Key Laboratory of Heavy-Haul Railway Engineering Structures，Central South University，Changsha 410000，Hunan，China;3． National Engineering Laboratory of Highway Maintenance Technology，Changsha University of Science ＆ Technology，Changsha 410114，Hunan，China;4． School of Civil Engineering，Central South University of Forestry and Technology，Changsha 410000，Hunan，China;5． School of Civil Engineering，Henan Polytechnic University，Jiaozuo 454150，Henan，China
  • Received:2019-12-18 Revised:2020-04-03 Online:2020-09-25 Published:2020-09-01
  • Contact: 欧雪峰 (1990-)，男，讲师，博士，主要从事隧道及地下空间理论及技术研究。 E-mail:oxfrock@163.com
  • About author:冯涵 (1991-)，男，博士，主要从事隧道结构缺陷病害及治理研究。E-mail: fenghan_csu@163． com
  • Supported by:
    Supported by the National Natural Science Foundation of China (51978671)，the Major Scientific and Techno-logical Projects of Guizhou Province ( ［2018］ 3010) and the Open Fund of National Engineering Laboratory of Highway Mainte-nance Technology (Changsha University of Science ＆ Technology)

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Abstract: Geopolymer material itself has the advantages of fast setting and high early strength． In order to further explore the early ( ＜ 24h) performance characteristics of the material and the possibility to apply it in the rapid grouting reinforcement of broken rock mass，the early ( ＜ 24h) mechanical properties and the working performance indicators of geopolymer grouting material，such as fluidity，initial / final setting time and water evolution rate，were studied through the orthogonal test，taking the modified water glass solution as the activator，and the metakao-lin mixed with slag as the precursor． The test results show that，compared with the traditional pure cement slurry，the geopolymer grouting material has the advantages of fast setting time，high fluidity，good stability and early high strength of the stone． It can be applied to some rapid grouting and strengthening conditions． When the replacement rate of mineral powder is 45%，the modulus and concentration of the modified water glass activator are 1. 5 and 75% respectively，and the liquid-solid ratio is 1. 5，the comprehensive performance of geopolymer is the best． The replacement rate of mineral powder and the concentration of modified water glass activator are the two main factors that have relatively large influence on the slurry．

Key words: building materials, grouting, reinforcement, geoploymers