聚乙烯醇纤维再生混凝土劈裂抗拉强度尺寸效应研究  

Study on splitting tensile strength of polyvinyl alcohol fiber recycled concrete size effect

作　　者：杜嘉宾 陈英杰[1] 公茂成 李杰 罗成 DU Jiabin;CHEN Yingjie;GONG Maocheng;LI Jie;LUO Cheng(College of Water Resources and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Shandong Tianyuan Green Building Technology Co.,Ltd.,Linyi 276000,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]山东天元绿色建筑科技有限责任公司,山东临沂276000

出　　处：《混凝土》2024年第2期68-72,82,共6页Concrete

基　　金：国家自然科学基金(51668063);水利重点科学基金(SLXK2019-09)。

摘　　要：为研究聚乙烯醇(PVA)纤维再生混凝土劈裂抗拉强度的尺寸效应,以5种再生骨料取代率、5种PVA纤维掺量、3种试件尺寸为变量,对81个立方体试件进行劈裂抗拉试验。结果表明:随着骨料取代率的提高,再生混凝土劈裂抗拉强度先增加后降低,25%再生骨料取代率下再生混凝土劈裂抗拉强度及尺寸效应度表现最佳;PVA纤维可降低再生混凝土劈裂抗拉强度尺寸效应,随着PVA纤维掺量的提高,其尺寸效应先减小后增大,0.1%PVA纤维掺量最优;基于试验数据,给出了试件劈裂抗拉强度的效应律计算式,可进行各种尺寸规格试块的劈裂抗拉强度计算。In order to。clear PVA fiber reclaimed concrete splitting tensile strength of the size effect,the replacement rate of regenerated coarse aggregate,PVA fiber content and size were considered,the mechanical properties of 81 cubes were tested.In short,the replacement rate of regenerated coarse aggregate rises,after the RAC splitting tensile strength reduce after raise first.which is the most strongest when the replacement rate of RA was 25%,it is useful for PVA fiber to reduce the size effect of splitting tensile strength of RAC.With the development of PVA fiber content,their size effect raises first and then abates,0.1%PVA fiber makes it performance best.

关 键 词：聚乙烯醇纤维 再生混凝土 劈裂抗拉强度 尺寸效应 

分 类 号：TU528.572[建筑科学—建筑技术科学]