长江科学院院报 ›› 2012, Vol. 29 ›› Issue (3): 59-61.

• 水工结构与材料 • 上一篇    下一篇

喷射混凝土的室内检测方法及性能试验研究

汪在芹,石  妍,李家正,闫小虎   

  1. 长江科学院  水利部水工程安全与病害防治工程技术研究中心,武汉  430010
  • 收稿日期:2011-04-08 出版日期:2012-03-01 发布日期:2012-03-01
  • 作者简介:汪在芹(1961-),男,湖北沔阳人,教授级高级工程师,博士,主要从事水工材料的开发与研究
  • 基金资助:

    水利部公益性行业科研专项资金项目(200901066);中央级公益性科研院所基本科研业务费(CKSF2011018/CL)

Study on Indoor Test Methods and Performance of Shotcrete

WANG Zai-qin, SHI Yan, LI Jia-zheng, YAN Xiao-hu   

  1. Research Center on Water Engineering Safety and Disaster Prevention of MWR, Yangtze River Scientific Research Institute, Wuhan  430010, China
  • Received:2011-04-08 Published:2012-03-01 Online:2012-03-01

摘要: 采用自行设计的室内湿喷混凝土性能检测方法,开展喷射混凝土的力学、抗裂及施工性能试验研究。试验结果表明:复掺复合外加剂与粗纤维可提高喷射混凝土的抗压强度、弯曲韧性和抗裂性能;单掺复合外加剂和复掺外加剂与粗纤维的喷射混凝土,与围岩的轴拉粘结强度均在1.0 MPa以上,且复掺的强度较高;2组配合比的喷射混凝土回弹率分别为23%和20%,一次喷层厚度为22 cm和25 cm,复掺可增加混凝土的黏聚性,降低回弹率。由于场地及喷射仪器的限制,室内模拟试验的混凝土回弹率较现场高。

关键词: 喷射混凝土, 合成粗纤维, 力学性能, 与围岩粘结强度, 回弹率

Abstract: By using self-designed indoor test method, the performance of shotcrete were studied by blending  nano-additive and crude fiber. The results showed that inorganic nano-additive and crude fiber could improve the compressive strength, flexural toughness and crack resistance of shotcrete. Axial bond strength of shotcrete with adjacent rock was larger than 1.0MPa either by doping nano-additive only or both nano-additive and crude fiber. The resilience rates of shotcrete with two  mix proportions were 23% and 20%, and the shotcreting thickness were 22cm and 25cm. Doping both nano-additive and crude fiber can increase the cohesiveness and lower the resilience rate of shotcrete. The self-designed methods can also be used to compare the construction performance of different shotcrete. However, due to limitations of space and test equipment, the resilience rate in indoor test were higher than that in site test. The above test methods and results  provided reference for indoor study of shotcrete and the development of technical standards.

Key words: shotcrete, crude synthesis fiber, mechanical properties, bond strength with adjacent rock, resilience rate

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