摘要
利用三场耦合试验系统和SEM微观测试系统,以水泥砂浆为研究对象,设计4种试验工况,研究了不同水化学溶液、不同腐蚀龄期下砂浆试样物理力学特性的劣化规律,同时基于砂浆微细观结构损伤演化特征分析其在不同水化学溶液条件下的损伤破坏机理。研究结果表明:砂浆的化学腐蚀破坏是一个复杂的过程,不同水化学溶液对其影响程度不尽相同。在腐蚀后期,pH=1、浓度0.1mol/L的Na2SO4溶液对砂浆物理力学特性的腐蚀劣化程度大于pH=7、浓度0.1mol/L的Na2SO4溶液,pH=3、浓度0.1mol/L的Na2SO4溶液对砂浆物理力学特性的腐蚀劣化程度介于二者之间。同时,基于化学腐蚀后的力学特征参数定义了新的损伤参数,间接定量分析化学溶液对砂浆试样腐蚀劣化程度,研究发现,不同pH值Na2SO4溶液腐蚀下,砂浆损伤参数随时间呈多项式衰减。
Using three-field coupling test system and SEM micro-test system,four test conditions were designed to study the deterioration of physical and mechanical properties of mortar samples under different hydrochemical solutions and different corrosion ages.Meanwhile,the damage mechanism of mortar in different hydrochemical solutions was analyzed based on the damage evolution characteristics of its micro-structure.The results show that the chemical corrosion of mortar is a complex process,and different hydrochemical solutions have different effects on it.In the later stage of corrosion,the degradation degree of physical and mechanical properties of mortar by pH=1,0.1 mol/L Na2SO4 solution is greater than that by pH=7,0.1 mol/L Na2SO4 solution,and the degradation degree of physical and mechanical properties of mortar by pH=3,0.1 mol/L Na2SO4 solution is between the two.At the same time,a new damage parameter is defined based on the mechanical characteristic parameters after chemical corrosion,and the deterioration degree of chemical solution on mortar samples is quantitatively analyzed indirectly.It is found that the damage parameters of mortar decayed polynomially with time under different pH values of Na2SO4 solution.
作者
吴琼
强晟
徐力群
刘得潭
邓洋
WU Qiong;QIANG Sheng;XU Li-qun;LW De-tan;DENG Yang(College of Water Conservancy and Hydropower,Hohai University,Nanjing 210098,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第7期2033-2043,共11页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金/雅砻江联合基金(U1765205)
江苏高校优势学科建设工程资助(水利工程)(YS11001)
河海大学中央高校基本科研业务费2018(B55614)
关键词
水泥砂浆
物理力学效应
化学腐蚀
劣化
cement mortar
physical and mechanical effect
chemical corrosion
deterioration
