摘要
采用快速冻融法,以剥落量和相对动弹性模量作为混凝土抗盐冻性能的评定指标,研究了混凝土在3．5%NaCl溶液、5%、7%和10%Na_2SO_4溶液以及海水中的抗盐冻性能。试验结果表明,引气对混凝土在NaCl溶液、Na_2SO_4溶液和海水中的抗盐冻性能均有显著改善作用;混凝土在各种盐溶液中冻融循环后的破坏现象和破坏机理不同;Na_2SO_4溶液的浓度对混凝土的抗盐冻性能没有明显影响。
The frost resistance of concrete subjected to the action of 3.5% sodium chloride （NaCl） solution, 5%, 7% and 10% sodium sulfate （Na2S04） solution and seawater were investigated by quick freeze-thaw tests. There are two criteria, the change of relative dynamic elastic modulus （RDM） and the mass of scaling, for evaluating the resistance of concrete. The results show that entraining air into concrete is an effective method to improve the durability of concrete when subject to freeze - thaw cycles in all solutions. The deterioration form and mechanics of concrete in every soltition is different. Increasing the density of sodium sul- fate solution has little effect to the performance of concrete subjected to freeze- thaw cycles.
出处
《低温建筑技术》
2007年第1期1-4,共4页
Low Temperature Architecture Technology
基金
交通部西部交通建设科技资助项目(NO.200331882008)
关键词
混凝土
抗冻性
盐溶液
表面剥蚀
相对动弹性模量
concrete
frost resistance
salt solution
scaling
relative dynamic elastic modulus
