防水剂对隧道二衬防水混凝土强度和抗渗性能影响研究  

Research on the influence of Water Repellent to the Concrete Strength and Impermeability in the Second Lining of Tunnel

作　　者：华叙恒 王永海[2] 何涛[2] 隋玉凤[3] 

机构地区：[1]江西省公路机械工程局,江西南昌330008 [2]武汉理工大学材料科学与工程学院,湖北武汉430070 [3]湖北三峡职业技术学院交通工程系,湖北宜昌443000

出　　处：《中国包装科技博览（混凝土技术）》2010年第11期49-52,共4页China Science and Technology Review

基　　金：中央高校基本科研业务费专项资金资资助（2010-ZY-CL-073）和广东省江门市江海区科技局科技计划项目资助（江海府办函[2008]386号）,在此表示感谢.

摘　　要：二次衬砌混凝土的防水抗渗性能是隧道工程防止渗漏水的重要指标。通过几种防水剂对二次衬砌混凝土工作性能、力学性能和抗渗性能的测试，对比了掺与未掺防水剂（只引入减水剂）、和掺膨胀剂的混凝土的抗渗性能。研究结果表明防水剂和膨胀剂的引入会引起混凝土工作性和强度的略微下降；在较低水胶比下，混凝土的水压力渗透系数均较小，防水剂的引入对混凝土的抗渗性改善不明显；在较高水胶比下，不同防水剂对混凝土抗渗性的改善有所不同，部分防水剂对混凝土的抗渗性甚至没有改善作用。综合考虑经济因素，在工程对强度没有强制要求时建议直接通过引入减水剂来降低水灰比，进而通过提高混凝土的致密性来达到提高混凝土防水抗渗的目的。The water impermeability of secondary lining concrete is an important indicator in the tunnel preventing water leakage. By testing the workability, mechanical properties and impermeabilities, this subject compared the water impermeabilities of concrete mixed with water- proofing agent and expansive material or those not. The results showed that the introduction of water repellent and expander caused the performance and strength of concrete to decrease slightly; with a lower water-cement ratio, the concrete permeability coefficient of water pressure were smaller, and the water repellent had no obvious improvement on the impermeability of concrete; with higher water-cement ratio, different water repellent had different effects, some even had no effects. Considering the economic factors, it was suggested that introducing water repellent directly to lower water-cement ratio, thus improving the water impermeability of concrete by increasing its density. , when there is no strictly requirement for strength in engineering

关 键 词：防水剂 隧道 二次衬砌混凝土 强度 抗渗性 

分 类 号：TU528.01[建筑科学—建筑技术科学]