不同掺合料对喷射钢纤维混凝土性能的影响  

Effect of different admixtures on the properties of shotcrete with steel fibres

作　　者：翟军强 李向龙 周霄骋 秦世杰 秦鸿根[2] ZHAI Junqiang;LI Xianglong;ZHOU Xiaocheng;QIN Shijie;QIN Honggen(The Fourth Engineering Co.,Ltd.of China Communications Second Highway Engineering Co.,Ltd.,Luoyang 471002,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Jiangsu Daozhi Highway Science Research Institute Co.,Ltd.,Nanjing 210031,China)

机构地区：[1]中交二公局第四工程有限公司,河南洛阳471002 [2]东南大学材料科学与工程学院,江苏南京211189 [3]江苏道智公路科学研究院有限公司,江苏南京210031

出　　处：《混凝土与水泥制品》2024年第3期57-61,共5页China Concrete and Cement Products

基　　金：国家自然科学基金资助项目(51778621)。

摘　　要：依托某重点工程隧道穹顶支护用高性能喷射混凝土的性能要求,配制了C40喷射钢纤维混凝土,研究了掺合料的种类(粉煤灰、专用掺合料、抗裂剂)对喷射钢纤维混凝土工作性、力学性能和耐久性能的影响。结果表明:掺不同掺合料喷射钢纤维混凝土的坍落度均满足(180±20)mm的要求,表观密度稳定在2530 kg/m3左右,抗压强度均满足设计强度等级要求,耐久性能均较好;另外,与掺粉煤灰的喷射钢纤维混凝土相比,掺专用掺合料或抗裂剂的喷射钢纤维混凝土的保水性和黏聚性均较好,力学性能和耐久性能基本均较优,抗渗等级分别达到了P11和P10,28 d碳化深度均小于12.0 mm。Based on the performance requirements of high-performance shotcrete for tunnel dome support in a key engineering project,C40 shotcrete with steel fibers was prepared.The effects of different types of admixtures(fly ash,special admixtures,anti-cracking agents)on the workability,mechanical properties,and durability of shotcrete with steel fibers were studied.The results show that the slump of shotcrete with steel fibers mixed with different admixtures meets the requirement of(180±20)mm,the apparent density remains stable at around 2530 kg/m3,the compressive strength meets the design strength grade requirements,and the durability performance is good.In addition,compared with the shotcrete with steel fibers mixed with fly ash,the shotcrete with steel fibers mixed with special admixtures or anti-cracking agents has better water retention and cohesion,and basically better mechanical properties and durability,and the impermeability level reaches P11 and P10 respectively,and the 28 d carbonation depth is less than 12.0 mm.

关 键 词：隧道支护 喷射钢纤维混凝土 掺合料 工作性 力学性能 耐久性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]