摘要
为寻求隧道湿喷混凝土最优配合比,依托兰州至海口国家高速公路(G75)渭源至武都段木寨岭特长隧道工程,依据工程经验和工程类比,确定现场混凝土配合比参数,并设计配合比方案,采用喷射大板取样方法制作试件,通过抗压强度和现场回弹率的测试,探寻既满足实际工程要求,又能实现低碳经济目标的最优配合比。研究结果表明,当水胶比为0.40、砂率为46%、胶凝材料为450 kg/m 3时,混凝土各龄期的抗压强度、流动性能达到最大值,混凝土回弹率为最小值;混凝土强度较最小值增大约43.4%,坍落度和扩展度较最小值分别增大约72.2%和70%,边墙和拱顶的回弹率相较于最大值分别降低约34.5%和28.4%。
In order to find the optimal mix proportion of tunnel wet shotcrete,relying on the Muzhailing super long tunnel project of Weiyuan-Wudu section of Lanzhou-Haikou National Expressway(G75),based on engineering experience and engineering analogy,this research determined the on-site concrete mix proportion parameters,designed the mix proportion scheme,and used the shotcrete large plate sampling method to make test pieces.Through the test of compressive strength and on-site rebound rate,the exploration was proved to meet the actual engineering requirements and also achieved the optimal mix proportion of the goal of low-carbon economy.The results show that when the water binder ratio is 0.40,the sand ratio is 46%,and the cementitious material is 450 kg/m 3,the compressive strength and flow performance of concrete at each age reach the maximum,and the rebound rate of concrete is the minimum.The concrete strength is about 43.4%higher than the minimum value,the slump and expansion are about 72.2%and 70%higher than the minimum value respectively,and the rebound rate of side wall and vault is about 34.5%and 28.4%lower than the maximum value respectively.
作者
陈文渊
李鑫
何小军
麻骥
冀亚锋
Chen Wenyuan;Li Xin;He Xiaojun;Ma Ji;Ji Yafeng(No.3 Engineering Co.Ltd.of the 21st Bureau Group of China Railway,Xianyang 712023,China;Sichuan Highway Engineering Supervision Co.Ltd.,Chengdu 610000,China;Department of Urban Construction Engineering,Jinan Technician College,Handan 056000,China;School of Transportation Engineering,Nanjing University of Technology,Nanjing 211816,China)
出处
《石家庄铁道大学学报（自然科学版）》
2022年第3期73-78,共6页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
河北省高等学校科学技术研究青年基金(QN2020427)
中铁二十一局集团第三工程有限公司科技研发项目(202140141)。
关键词
湿喷混凝土
配合比
水胶比
砂率
回弹率
wet shotcrete
mix proportion
water binder ratio
sand rate
rebound rate
