摘要
通过混凝土在冻融和腐蚀等单一和多重因素作用下大量、系统的耐久性试验,得到混凝土损伤初速度(IDV)和损伤加速度(DA)等损伤劣化参数的基本数据库;采用SPSS10.0软件对该数据库数据进行回归和相关分析。结果表明:混凝土的IDV和DA取决于结构所处的环境、气候和受力状态,并与其原材料、配合比和养护条件密切相关;无论在单一因素还是在双重因素作用下,降低水胶比和加强潮湿养护均能够减小混凝土的IDV和DA;采用钢纤维增强技术可以降低混凝土的单因素IDV和DA,掺加矿物掺合料以及采用高强高模聚乙烯纤维增强技术能够降低混凝土的双因素IDV和DA;IDV和DA越大,混凝土的冻融寿命就越短。
Initial damage velocity（IDV） and damage acceleration（DA） of concrete subjected to single or combined factors, such as freezing-thawing and chemical attacks, were obtained through a mass of durability experiments, and the database was also established. Regression and correlative analysis of the database were carried out by using SPSS10.0 software. Results show that IDV and DA of concrete are determined by the environment, climate and load state and at the same time are closely influenced by the raw materials, mixture ratio and curing condition. Lower water cement ratio and higher relative humidity can reduce IDA and DA of concrete subjected to either signal or double factors. For concrete subjected to single factor, IDV and DA can be decreased by adding steel fibers, while for concrete subjected to double factors, IDV and DA can be decreased by adding higher elasticity module polyethylene fibers or mineral admixture. It is evident that the larger the IDV and DA are, the shorter the freezing-thawing life is.
出处
《建筑科学与工程学报》
CAS
2011年第4期1-8,共8页
Journal of Architecture and Civil Engineering
基金
国家重点基础研究发展计划("九七三"计划)项目(2009CB623203)
国家自然科学基金项目(51178221)
中央高校基本科研业务费专项资金项目(NS2010015)
关键词
混凝土
单一因素
双重因素
损伤初速度
二次损伤初速度
损伤加速度
冻融寿命
concrete
single factor
double factor
initial damage velocity
second initial damage velocity
damage acceleration
freezing-thawing life
