摘要
为提高围岩的抗渗性能,采用普通水泥浆液掺加无碱外加剂制备高抗渗注浆材料。试验结果表明,在水灰比0.65~1.0范围内,调整浆液配合比,浆液流动度可达到230 mm^270 mm,初凝时间小于2 h,具有良好的施工性能;注浆材料结石体早期强度发展快,后期强度高且无倒缩现象。注浆材料具有微膨胀特性,内部孔径细化,具有良好的抗渗性能,抗渗等级大于P8,满足工程抗渗需求。
Cement-based grouting material is used to reinforce surrounding rocks of the subsea tunnel from Xiamen to Xiang'an. In order to improve the anti-permeability of the grouting material, alkali-free admixtures were mixed into the cement grouting material and the performance of materials was studied. Water cement ratio (w/c), the mixing amount of setting accelerator and water reducing agent were adjusted in the experiments, and the results showed that the initial setting time of the grout is less than 2 h while the grout flow ability ranges from 230 mm to 270 mm which indicating good workability. The grouting materials are characteristic of high early strength, stable long-term strength and micro dilatancy performance. The permeability grades of grouting materials ( with the w/c of 0.65, 0. 8 and 1.0, respectively) are higher than PS, which superiors to the contrast sample with no admixture. The improvement of anti-permeability is due to the thinning of pore size of grout stone.
作者
马召林
阳勇福
焦雷
王玉江
林海燕
MA Zhaolin YANG Yongfu JIAO Lei WANG Yujiang LIN Haiyan(Research Institute of Railway Tunnel Group, Luoyang 471009, China Luoyang Institute of Science and Technology, Luoyang 471023, China Henan Key Laboratory of Special Protective Materials, Luoyang 471023, China)
出处
《洛阳理工学院学报(自然科学版)》
2017年第3期12-15,共4页
Journal of Luoyang Institute of Science and Technology:Natural Science Edition
关键词
注浆材料
抗渗性能
流动度
凝结时间
抗压强度
grouting material
anti-permeability
flow ability
setting time
compress strength