多因素影响下再生自密实混凝土劈裂抗拉强度的试验研究  

Experimental Study on Splitting Tension Strength of Fire-damaged Self-Compacting Recycled Concrete with Different Influencing Factors

作　　者：李韧[1] 贾龙杰 毕重[1] 王学志[1] 孔祥清[1] LI Ren JIA Long-jie BI Zhong WANG Xue-zhi KONG Xiang-qing(School of Civil and Architectural Engineering, Liaoning University ofTechoology, Jinzhou 121001, China)

机构地区：[1]辽宁工业大学土木建筑工程学院,辽宁锦州121001

出　　处：《辽宁工业大学学报（自然科学版）》2017年第4期239-243,共5页Journal of Liaoning University of Technology(Natural Science Edition)

基　　金：辽宁省科学技术计划项目(2015020214)

摘　　要：对21组C30再生自密实混凝土试件进行劈裂抗拉试验,分析了高温处理、喷淋冷却或自然冷却和低温处理等模拟火灾过程对再生自密实混凝土劈裂抗拉强度的影响。研究表明,试件劈裂抗拉强度随着温度升高而逐渐降低,温度升高到600℃时,强度降低约70%。高温后经自然冷却的自密实再生混凝土抗拉强度比仅采用喷淋冷却的高。采用自然冷却并进行低温处理后的自密实再生混凝土劈裂抗拉强度均低于常温状态不做处理的劈裂抗拉强度,强度降低约16%;采用喷淋冷却并进行低温处理对自密实再生混凝土劈裂抗拉强度影响不明显。This paper conducted splitting tension strength of 21 groups fire-damaged C30 SCRC, and analyzed the influence of high-temperature processing, cooling methods and low-temperature processing on the splitting tension strength of SCRC. The experimental results showed that the splitting tension strength reduced with temperature rise, and when the maximum temperature was up to 600℃, the splitting tension strength reduced about 70%. The splitting tension strength of SCRC after natural cooling is higher than the one after spray cooling in high-temperature processing. After natural cooling and low-temperature processing, the splitting tension strength of SCRC was lower than the one in normal temperature, the splitting tension strength reducing about 16%. Under the condition of spray cooling, the influence of the splitting tension strength after the low-temperature processing was not obvious.

关 键 词：再生自密实混凝土 劈裂抗拉强度 高温处理 冷却方法 低温处理 

分 类 号：TU528[建筑科学—建筑技术科学]