抗溶蚀喷射混凝土长龄期溶蚀性能对比研究  

Comparative study on long-age dissolution performance of corrosion-resistant shotcrete

作　　者：刘凯 蔡景顺[1,2] 王涛 谢德擎[1,2] LIU Kai;CAI Jingshun;WANG Tao;XIE Deqing(State key Laboratory of High performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.Ltd.,Nanjing 211103,China;Jiangsu Sobute New Materials Co.Ltd.,Nanjing 211103,China)

机构地区：[1]高性能土木工程材料国家重点实验室,江苏省建筑科学研究院有限公司,江苏南京211003 [2]江苏苏博特新材料股份有限公司,江苏南京211103

出　　处：《新型建筑材料》2024年第11期18-22,共5页New Building Materials

基　　金：江苏省基础研究计划自然基金项目(BK20221550);江苏省前沿引领技术基础研究重大项目(BK20222000)。

摘　　要：通过对排水沟水质、混凝土抗压强度、氯离子扩散系数、吸水率、芯样中CaO含量及排水沟结晶体厚度研究了RS(Ⅰ)溶蚀抑制剂对服役2年的喷射混凝土抗溶蚀性能的影响。结果表明:服役745 d后,RS(Ⅰ)溶蚀抑制剂的掺入抑制了喷射混凝土中钙离子的溶出,排水沟水中钙离子含量仅为普通喷射混凝土段的37.8%,相比468 d时抗压强度损失仅有3.2%,氯离子扩散系数降幅达22.3%,吸水率降幅达55.2%,芯样10 cm内钙离子溶出率降幅达3.1个百分点,排水沟中结晶体厚度降幅72.7%,显著提升了喷射混凝土抗水流冲刷溶蚀性能,保障了隧道衬砌混凝土的服役寿命。In this paper,the effect of RS(Ⅰ)corrosion inhibitor on the corrosion resistance of shotcrete which has been in service for two years is studied through the analysis of drain water quality,concrete compressive strength,chloride ion diffusion coefficient,water absorption,CaO content in core sample and crystal thickness of drain ditch.The results show that after 745 days of service,the addition of RS(Ⅰ)corrosion inhibitor inhibits the dissolution of calcium ion in shotcrete.The calcium ion concentration in the drain water is only 37.8%of that of the ordinary sprayed concrete section,compared with 468 days,the compressive strength loss is only 3.2%,the chloride ion diffusion coefficient decreases by 22.3%,the water absorption decreases by 55.2%,the dissolution rate of calcium ions in the core sample 10 cm decreases by 3.1 percent point,and the crystal thickness in the gutter decreases by 72.7%,which significantly improves the water erosion and dissolution resistance of shotcrete and ensures the service life of tunnel lining concrete.

关 键 词：溶蚀抑制剂 喷射混凝土 溶蚀 强度 钙离子 

分 类 号：TU528.53[建筑科学—建筑技术科学]