隧道湿喷高性能喷射混凝土配合比试验研究  

Experimental Study on Mix Proportion of High Performance Wet-mix Shotcrete in Tunnel

作　　者：张戈[1] 安明喆[1] 王月[1] 王靖[2] 黄良贤 刘俊元[2] ZHANG Ge;AN Ming-zhe;WANG Yue;WANG Jing;HUANG Liang-xian;LIU Jun-yuan(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Institute of Construction Engineering Co.,Ltd.,Beijing 100039,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京市建筑工程研究院有限责任公司,北京100039

出　　处：《混凝土与水泥制品》2021年第12期12-15,28,共5页China Concrete and Cement Products

基　　金：北京市自然科学基金项目(8192032)。

摘　　要：基于回弹率、强度和耐久性的要求,进行了胶凝材料用量、水胶比及砂率对喷射混凝土性能影响的试验研究。结果表明:水胶比影响着喷射混凝土的内聚力和黏附力,是影响回弹率的最主要因素;受工作性和施工工艺的影响,胶凝材料用量是影响喷射混凝土1 d和28 d抗压强度的主要因素;当胶凝材料用量为540 kg/m^(3)、水胶比为0.38、砂率为50%、硅灰掺量为15%时,可制备出回弹率为8.2%,28 d抗压强度为71.2 MPa,电通量为133 C,抗冻等级大于F300,28 d碳化深度为2 mm的高性能喷射混凝土。Based on the requirements of rebound rate,strength and durability,the experimental study on the influence of the content of cementitious materials,water-binder ratio and sand ratio on the performance of shotcrete was carried out.The results show that the water-binder ratio affects the cohesion and adhesion of shotcrete,which is the most important factor affecting the rebound rate.Affected by workability and construction technology,the content of cementitious materials is the main factor affecting the compressive strength of shotcrete at 1 d and 28 d.The high-performance shotcrete with dosage of cementitious material is 540 kg/m^(3),water-binder ratio is 0.38,sand ratio is 50%and silica fume content is 15%has excellent properties.Its rebound rate is 8.2%,the 28 d compressive strength is 71.2 MPa,the electric flux is 133 C,and the frost resistance level is greater than F300,and the 28 d carbonation depth is 2 mm.

关 键 词：高性能喷射混凝土 配合比 回弹率 强度 耐久性 水胶比 砂率 工作性 

分 类 号：TU528[建筑科学—建筑技术科学]