微-纳米尺度掺合料改善补偿收缩湿喷混凝土致密性研究  

Improving the Compactness of Compensating Shrinkage Wet Sprayed Concrete with Micro Nano Scale Admixtures

作　　者：钟安然 宁逢伟 李增堂[4] 曾伟辉 白银 张丰[3] 吕乐乐 ZHONG Anran;NING Fengwei;LI Zengtang;ZENG Weihui;BAI Yin;ZHANG Feng;LLele(Zhaotong Yizhao Expressway Project Headquarters,Zhaotong,Yunnan657099,China;China Water Resource Northeast Investigation Design and Research Co.,Ltd.,Changchun,Jilin130061,China;Nanjing Hydraulic Research Institute,Jiangsu,Nanjing 210029,China;Yunnan Highway Bureau Dali Branch,Dali,Yunnan 671013,China;Zhaotong Yizhao Expressway Investment and Development Co.,Ltd.,Zhaotong,Yunnan 657602,China)

机构地区：[1]昭通市宜昭高速公路项目指挥部,云南昭通657099 [2]中水东北勘测设计研究有限责任公司,吉林长春130061 [3]水利部交通运输部国家能源局南京水利科学研究院,江苏南京210029 [4]云南公路局大理公路局,云南大理671013 [5]昭通市宜昭高速公路投资开发有限公司,云南昭通657602

出　　处：《施工技术(中英文)》2024年第23期63-69,共7页Construction Technology

基　　金：云南省交通运输厅科技创新及示范项目(云交科教便〔2021〕14号)。

摘　　要：考察粉煤灰、普通矿粉、超细矿粉、硅灰、纳米SiO2等微-纳米尺度活性掺合料对混凝土密实度的改善效果,总结膨胀剂挤压致密效应的阈值特征,量化高掺量硅灰的致密性能,提出微-纳米尺度掺合料的“粗略填充”和“精细填充”两阶段填充特征,阐明了两阶段的主要影响因素和发生条件。以云南宜昭高速公路柳溪隧道为依托工程,采用现场原材料制备了C50高致密补偿收缩湿喷混凝土,56d电通量549C,渗透孔隙率103%,达到了常规浇筑高性能混凝土的密实度水平。在该高速公路隧道主体洞段实施50延米湿喷混凝土永久性支护,取代了复合衬砌。The compactness improvement of which by micro-nano scale admixtures such as fly ash,ordinary mineral powder,ultrafine mineral powder,silica fume,and nano SiO2 was investigated based on properties of crack resistance.The characteristics of threshold to compacting of expansion agents were discovered.The densification performance of high volume silica fume was quantified.The two-stage filling characteristics of‘rough filling’and‘fine filling’for micro-nano scale admixtures were proposed,whose main influencing factors and occurrence conditions were clarified.Relying on Liuxi Tunnel of Yizhao Expressway in Yunnan Province,C50high density shrinkage-compensating wet-mix shotcrete was made with in-site raw materials.Its 56-days electric flux was 549C,and the permeable porosity was 10.3%,basically equaling to the compactness level of normal high-performance concrete.A 50-meters long tunnel was constructed using wet-mix shotcrete for permanent support,replacing composite lining.It was located the main line of the tunnel.

关 键 词：高速公路 湿喷混凝土 掺合料 密实性 电通量 

分 类 号：U454[建筑科学—桥梁与隧道工程]