硫酸盐侵蚀对早龄期混凝土力学性能和孔隙结构研究  

Study on mechanical properties and pore structure of concrete under early age sulfate attack

作　　者：陈子瑜 王起才[1,2] 代金鹏[1,2] 杜文涛 楚昊 武学龙 CHEN Ziyu;WANG Qicai;DAI Jinpeng;DU Wentao;CHU Haoa;WU Xuelong(Bridge Engineering National Local Joint Engineering Laboratory of Disaster Prevention and Control Technology,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;Jiugang(Hongda)Building Materials Co.,Ltd.,Jiayuguan 735100,China)

机构地区：[1]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃兰州730070 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070 [3]酒钢(宏达)建材有限责任公司,甘肃嘉峪关735100

出　　处：《混凝土》2024年第11期74-78,共5页Concrete

基　　金：国家自然科学基金(51768033,51808272);甘肃省青年科技基金(21JR7RA330);甘肃省青年科技人才托举工程项目(GXH20210611-10);兰州交通大学“天佑青年托举人才计划”基金;长江学者和创新团队发展计划滚动项目(IRT_15R29);嘉峪关市科技计划项目(21-09);甘肃省引导科技创新发展专项-重点研发能力提升项目(2019ZX-09)。

摘　　要：以0.38水胶比混凝土为试验对象,分别进行了抗压强度、质量损失、动弹性模量、核磁共振试验,研究了不同初始侵蚀龄期对混凝土力学性能和孔隙结构的变化规律,并建立弹性模量预测模型。研究表明:硫酸盐侵蚀下混凝土抗压强度、质量和动弹性模量呈先上升后下降的变化趋势,且初始侵蚀龄期越晚,抗压强度和动弹性模量越大,强度和动弹性模量损失越多,并建立弹性模量预测模型。对混凝土孔隙率和孔径分布变化规律进行了研究。Taking 0.38 water-binder ratio concrete as the test object,the compressive strength,mass loss,dynamic modulus of elasticity and nuclear magnetic resonance tests were carried out respectively,and the changes of mechanical properties and pore structure of concrete at different initial erosion ages were studied,and the prediction model of elastic modulus was established.The research shows that the compressive strength,quality and dynamic modulus of elasticity of concrete under sulfate attack show a trend of increasing first and then decreasing,and the later the initial erosion age is,the greater the compressive strength and dynamic modulus of elasticity are,the more the loss of strength and dynamic modulus of elasticity is,and the prediction model of elastic modulus is established.The change law of concrete porosity and pore size distribution was studied.

关 键 词：硫酸盐侵蚀 初始侵蚀龄期 孔隙结构 弹性模量预测 

分 类 号：TU528.01[建筑科学—建筑技术科学]