硅酸盐通报2018，Vol.37Issue(6)：1818-1824,7.
弯曲荷载下喷射混凝土衬砌碳化耐久性研究
Experiment Research of Carbonation Durability of Shotcrete Lining under Bending Loading
摘要
Abstract
In order to investigate carbonation durability of tunnel lining shotcrete, using spring-four points bending loading method, considering the influence of forming mode and steel fiber mixing, carbonation durability of shotcrete under bending loading ratio of 0.25, 0.50 and 0.75 was carried out.Meantime, compressive, splitting tensile and flexural strengths of carbonation concrete specimens were measured. Based on Zhang's carbonization model, instructing the effective coefficient of bending loading, steel fiber and forming mode, the carbonation depth predictive model of bending loading shotcrete was established. The result shows that carbonation depth of concrete with bending stress obeys Fick's first law. Carbonation coefficient has relationship with force mode, bending ratio, steel fiber mixing and forming mode.Shotcrete has better carbonation durability than ordinary concrete.Furthermore, steel fiber mixing can improve shotcrete carbonation resistance.With carbonation depth increasing, compressive and splitting tensile strengths of carbonation concrete increase.However, flexural strength of those is first decreased quickly and then stable.Comparison with predictive values and experiment data, the mean deviation is less than 10% and the standard deviation is 0.07.It has good applicability for predicting carbonation depth of bending loading shotcrete.关键词
隧道工程/衬砌结构/喷射混凝土/弯曲荷载/快速碳化Key words
tunneling engineering/lining structure/shotcrete/bend loading/accelerated carbonation分类
建筑与水利引用本文复制引用
王家滨,牛荻涛..弯曲荷载下喷射混凝土衬砌碳化耐久性研究[J].硅酸盐通报,2018,37(6):1818-1824,7.基金项目
国家自然科学基金重大项目支课题 (51590914) （51590914）
教育部创新团队发展计划 (IRT17R084) （IRT17R084）
西安工业大学校长基金(XAGDXJJ17019) （XAGDXJJ17019）
