氯盐浸泡下再生混凝土力学性能试验研究  

Experimental Research on Mechanical Properties of Recycled Concrete Immersed in Chloride Solution

作　　者：周金枝 付甜甜 双子洋 周陈旭 周亚栋 ZHOU Jinzhi;FU Tiantian;SHUANG Ziyang;ZHOU Chenxu;ZHOU Yadong(College of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;The First Company of China Eighth Engineering Bureau Ltd.,Guangzhou 510700,China;State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430034,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068 [2]中建八局第一建设有限公司,广州510700 [3]桥梁结构健康与安全国家重点实验室,武汉430034

出　　处：《工业建筑》2023年第6期187-193,共7页Industrial Construction

基　　金：桥梁结构健康与安全国家重点实验室资助项目(BHSKL19-04-KF);湖北省教研项目(省2017314)。

摘　　要：对不同浸泡龄期下的混凝土(C)、再生混凝土(RC)、钢纤维再生混凝土(SFRC)、金刚砂再生混凝土(SiCRC)等试件分别进行了立方体抗压、劈裂抗拉试验研究。将4类混凝土制成的标准立方体试块浸泡在质量分数为5%的NaCl溶液中,浸泡时间分别均为0,30,60,90 d;之后完成试验,并将得到的RC、SFRC、SiCRC等再生混凝土的力学性能与普通混凝土进行比较,通过对试验数据进行拟合,分别得到了不同类型混凝土的抗压、劈裂抗拉强度随龄期变化的关系式,并分析了不同龄期氯盐浸泡对各类再生混凝土的影响机理。结果表明:C、RC、SiCRC等混凝土的抗压、劈裂抗拉强度均随着氯盐浸泡龄期的增长而增长,而SFRC混凝土的强度性能则相反;氯盐浸泡后的SFRC试件颜色加深,且表面出现锈蚀现象,其他类型混凝土试件均无明显变化,表明SiCRC、RC和C较SFRC更适用于氯盐环境。The specimens of concrete(C),recycled concrete(RC),steel fiber reinforced recycled concrete(SFRC) and silicon carbide recycled concrete(SiCRC) at different soaking ages were studied by compression test and splitting tensile test.Four types of standard concrete cube test blocks were immersed in a NaCl solution with a mass fraction of 5%.Soaking time was 0 d,30 d,60 d and 90 d,then finished the test.The mechanical properties of recycled concrete such as RC、SFRC、SiCRC were compared with ordinary concrete,the relations between the compressive strength and splitting tensile strength of different types of concrete with age were obtained by fitting the test data,and the influence mechanism of chloride salt immersion at different ages on recycled concrete was analyzed.The results showed that the compressive strength and splitting tensile strength of C,RC,SiCRC and other concrete increased with the increase of chlorine salt immersion age,while the strength performance of SFRC concrete was opposite.The color of SFRC specimens after being subjected to chlorine salt immersion was deepened and the surface was corroded.There was no obvious change in other types of concrete specimens,which indicated that SiCRC、RC and C were more suitable for chlorine salt environment than SFRC.

关 键 词：再生混凝土 钢纤维 金刚砂 不同浸泡龄期 试验研究 非线性拟合 

分 类 号：TU528[建筑科学—建筑技术科学]