负温混凝土耐久性与结构损伤评价参数  

Durability and Evaluation Parameter of Structure Damage of Concrete at Subzero Temperature

作　　者：杨英姿[1] 高小建[1] 邓红卫[1] 巴恒静[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150001

出　　处：《武汉理工大学学报》2009年第10期39-43,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50078019)

摘　　要：研究了掺与未掺防冻剂混凝土在不同养护制度下混凝土抗压强度(R)、混凝土50次冻融循环强度损失率(Δf)及混凝土渗透系数(P)。参照防冻剂标准JC475,提出以(R、Δf、P)28/(R、Δf、P)028,(R、Δf、P)-7+28/(R、Δf、P)028和(R、Δf、P)-7+28/(R、Δf、P)作为负温混凝土结构损伤评价参数。结果表明,(R、Δf、P)-7+28/(R、Δf、P)28的提出弥补了防冻剂标准JC475的不足。上述评价参数全面、合理,能够评判防冻剂的种类对负温混凝土结构的损伤程度,提出了从混凝土长期耐久性出发时未来防冻剂的设计方向,指明适当延长正温养护时间是提高混凝土耐久性的重要措施。This paper investigated the compressive strength（R ）, loss of compressive strength after 50 freeze-thaw-cycles （A f） and permeability （P）of concrete with and without anti-freezing admixture undergoing different curing system . The （R、△f、P）P28/（ R、△f、P）028, （R、△f、P） 7＋28/（R、△f、P）028 and （R、△f、P） 7＋28/（R、△f、P）28 are chose to evaluate structure damage of concrete at subzero temperature. The results show that the（R、△f、P） 7＋28/（R、△f、P）28 make up for the lack of anti-freezing admixture standard of JCA75. These evaluation parameters are complete and are able to judge the effects of type of antifreeze on structure damage of concrete. If paying much more attention on durability of concrete, the future design direction of antifreeze was given. Appropriate extension of pre-curing time was an important measure to improve the durability of concrete.

关 键 词：负温混凝土 结构损伤 评价参数 防冻剂 

分 类 号：TU528.31[建筑科学—建筑技术科学]