The shrinkage-compensating concrete prepared by calcium and magnesium oxides based expansive agent can make up for the defects of excessive shrinkage deformation of concrete in the alternative bay constructon method.The combination technology of alternative bay method and shrinkage-compensating concrete has a good crack control effect in the application of engineering solid structure.The monitoring data of the solid structure show that the early maximum micro-strain with temperature correction of the concrete was about 31 µε～104 µε,and the micro-strain value was slowly reduced to about-153 με～-48 µε in the 60 d age.The shrinkage-compensating concrete prepared with calcium and magnesium oxides based expansive agent had smaller shrinkage and lower cracking risk in a longer age.The amount of shrinkage deformation of different plates was related to the number of adjacent plates and the size of block structure.The early cooling rate and temperature drop shrinkage could be controlled by increasing the number or thickness of insulation materials.
关键词
跳仓法/补偿收缩混凝土/钙镁复合膨胀剂/大体积混凝土/裂缝控制
Key words
alternative bay method/shrinkage-compensating concrete/calcium and magnesium oxides based expansive agent/mass concrete/crack control
维普
万方数据