摘要
针对水泥混凝土结构在服役期间经历干旱、降雨等自然现象的交替作用所产生的体积变化,选择在温度、湿度交变[35℃,相对湿度(relative humidity)Rh=30%;20℃,Rh=100%]试验条件下评价减缩剂对水泥石体积稳定性的影响,并采用核磁共振和压汞仪分析其机理。结果表明:减缩剂通过提高水泥石在温度、湿度交变环境的水化程度、增大水化硅酸钙凝胶的聚合程度,同时降低水泥石的可逆、不可逆收缩及最大长度变化,减小在严酷干燥条件的干缩值及潮湿环境的湿胀值,提高在恶劣自然环境保持较高体积稳定性的能力。
Capability of cementitious materials to resist cracks was decided by its volume stability under different conditions.Different temperature and humidity parameters（35℃,relative humidity Rh=30%;20℃,Rh=100%） were selected to simulate different environment conditions,the influence of shrinkage reducing admixture on volume stability of cement paste containing was studied,and the mechanism of shrinkage reducing admixture action was researched by the nuclear magnetic resonance and mercury intrusion porosimetry.The results show that the volume stability of cement paste under alternating temperature and humidity is strengthened through improving the hydration process,that is,enhancing the hydration degrees for cement and polymerization degrees for calcium silicate hydrate,changing the structure of hydration products and the reversible/irreversible shrinkage ratio.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第3期478-485,共8页
Journal of The Chinese Ceramic Society
基金
国家"973"计划(2009CB623106)
"十一五"科技支撑(2006BAF02A25)资助项目
关键词
水泥石
减缩剂
体积稳定性
机理
cement paste
shrinkage reducing
admixture volume stability
mechanism
