摘要
采用长期自然浸泡方法,对混凝土在MgSO_(4)及MgSO_(4)+NaCl溶液中的损伤进行研究,观察混凝土在侵蚀溶液的破坏形态,并测定了混凝土在不同侵蚀龄期的相对动弹性模量与质量变化,结果表明:混凝土在Mg^(2+)+SO_(4)^(2-)侵蚀下的破坏形态为粉化、腐蚀坑点等现象,Cl^(-)的存在减弱了混凝土表面的破坏现象;NaCl的存在不改变硫酸镁侵蚀混凝土的变化规律,但是氯盐的存在减缓了硫酸镁溶液对混凝土的腐蚀,并且随着氯盐浓度的增大减弱作用越明显;混凝土在Mg^(2+)+SO_(4)^(2-)+Cl^(-)复合溶液作用下其质量变化初期缓慢后期快速增加的趋势,并且在侵蚀初期Cl^(-)存在延长了混凝土表面破坏的时间,提高了混凝土抵抗盐溶液侵蚀的能力。
Using long-term natural immersion method to improve the damage of concrete in MgSO_(4)and MgSO_(4)+NaCl solutions.Conduct research to observe the failure mode of concrete in erosion solution,and measure the relative dynamic elastic modulus and quality changes of concrete at different erosion ages.The results show that the failure mode of concrete under Mg^(2+)+SO_(4)^(2-)erosion is powdering,corrosion pits,and other phenomena,and the presence of Cl^(-)weakens the failure phenomenon on the concrete surface;The presence of NaCl does not alter the variation pattern of magnesium sulfate corrosion on concrete,but the presence of chloride salts slows down the corrosion of magnesium sulfate solution on concrete,and the weakening effect becomes more pronounced with the increase of chloride salt concentration;Under the action of Mg^(2+)+SO_(4)^(2-)+Cl^(-)composite solution,the quality of concrete shows a slow initial change and a rapid increasing trend in the later stage.In addition,the presence of Cl^(-)in the early stage of erosion prolongs the time of concrete surface damage and improves the ability of concrete to resist salt solution erosion.
作者
王展飞
朱静
Wang Zhanfei;Zhu Jing
出处
《江苏建材》
2024年第1期23-25,共3页
Jiangsu Building Materials
关键词
混凝土
硫酸镁
氯盐
损伤
质量变化
相对动弹性模量
concrete
magnesium sulfate
chlorides
damage
quality changes
relative dynamic modulus of elasticity
