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以工程实测温升曲线分别建立绝湿温升、100%RH温升模拟水化环境,将硫铝酸钙-氧化钙类膨胀剂(HCSA)、硫铝酸钙类膨胀剂(CSA、AEA)配制的补偿收缩混凝土,置于标准养护及上述模拟水化环境中,研究水化环境和膨胀剂类别对补偿收缩混凝土膨胀性能的影响。结果表明,标准养护、100%RH温升模拟水化环境下,三种补偿收缩混凝土均有膨胀性,且HCSA补偿收缩混凝土的膨胀性能优于CSA和AEA。绝湿温升水化环境中,只有HCSA补偿收缩混凝土发生膨胀,CSA和AEA膨胀率几乎为零。因此,无法进行湿养护的工程部位,补偿收缩混凝土应以硫铝酸钙-氧化钙类混凝土膨胀剂为主。
Based on the measured temperature rise curve, the desiccant temperature rise and the 100% RH temperature rise simulated hydration environment were respectively established. Calcium sulphoaluminate-calcium oxide expansive agent (HCSA), calcium sulphoaluminate expansion agent (CSA, AEA) The compensated shrinkage concrete is placed in the standard curing and the above simulated hydration environment to study the influence of hydration environment and expander type on the swelling performance of compensated shrinkage concrete. The results show that the three kinds of shrinkage-compensated concrete have expansibility under the condition of standard curing and 100% RH temperature-rising simulated hydration, and the expansion performance of HCSA compensating shrinkage concrete is better than that of CSA and AEA. In the environment of absolute temperature and humidity reduction, only HCSA compensated shrinkage concrete expands, and the expansion rate of CSA and AEA is almost zero. Therefore, the wet curing project can not be compensated for shrinkage of concrete should be calcium sulfoaluminate - calcium oxide concrete expansion agent based.