作　　者： ; ; ; (张建业）; (燕坤）;

机构地区： 中国土木工程集团有限公司北京100038

出　　处： 《混凝土》 2009年第12期32-36,共5页

摘　　要： 采用快冻法研究了普通混凝土(OPC)、高性能混凝土(HCMC)以及绿色高耐久性混凝土(GHDC),在盐溶液作用及其与弯曲应力的同时作用下,混凝土的抗冻性以及不同增强措施对混凝土抗冻性的影响。结果表明:弯曲应力加速了混凝土的冻融损伤,盐溶液减缓了混凝土的冻融损伤程度。水胶比减小和大掺量矿物掺合料(粉煤灰+矿渣+硅灰),难以抑制混凝土在(冻融+10%NaCl)、(冻融+5%MgSO4)和(冻融+35%弯曲应力+5%MgSO4)作用下的冻融损伤,但是对于混凝土在单一冻融、(冻融+5%MgCl2+5%Na2SO4)、(冻融+35%弯曲应力)、(冻融+35%弯曲应力+10%NaCl)和(冻融+35%弯曲应力+5%MgCl2+5%Na2SO)4作用下的冻融损伤却具有显著的抑制效果。同时掺加混杂纤维、膨胀剂和引气剂的GHDC,抑制冻融损伤的效果非常明显,在弯曲应力及盐溶液同时作用下具有超高的抗冻融破坏能力。 Using the method of accelerated freezing-thawing test studied the ordinary Portland cement concrete （OPC） ,the concrete with high content mineral admixture （HCMC） and the green high performance concrete （ GHPC ）, which subjected to salt solution and salt solution with bending stress coupling action, concrete＇s frost resisting durability and different reinforced measure work on concrete＇s frost resisting durability.Results indicated： the bending stress accelerates the concrete＇s freezing- thawing damage, the .salt solution recedes the concrete＇s freezing-thawing damage. Lower water cement ratio and high content mineral admixture （PVA＋slag＋silica ash ） are difficult to restrain concrete＇s freezing-thawing damage that are subjected to （freezing-thawing＋10% NaCI solution）, （freezing-thawing＋5% MgSO4 solution） and （freezing-thawing＋35% bendmg stress＋5% MgSO4 sohition ） combination,but are remarkable to restrain concrete＇s freezing-thawing damage that are subjected to freezing-thawing, （freezing-thawing＋5%MgCl2 solution＋5%Na2SO4 solution）, （freezing-thawing＋35% bending stress）, （frerzing-thawing＋35% bending stress＋ 10% NaCl solution ） and （freezing-thawing＋35% bending stress＋5%MgCl： solution＋5%Na2SO4 solution ） combination.GHDC which contains hybrid fibre,expansion agent and air-entrained agent are much more remarkable to restrain concrete＇s freezing-thawing corrosion,especially if it is subjected to bending stress and salt solution coupling effect, it has a superhigh durability to restrain concrete＇s freezingthawing damage.

关 键 词： 混凝土 抗冻性 腐蚀溶液 弯曲应力 冻融损伤

领　　域： [建筑科学]