Research on the anti-crack technology of mass concrete in Jiangyin Jingjiang Yangtze River Tunnel
Jiangyin Jingjiang Yangtze River Tunnel is the largest diameter shield tunnel under construction in China,the thickness of its open and cut main structure reaches 2.2 m,which facing a great risk of cracking and leakage.Based on the double regulated technology of hydration and expansion process,the influence of moisture regulation by super absorbent polymer(SAP)on the crack resistance of concrete was further studied.Laboratory experiment results showed that SAP significantly improved the autogenous expansion deformation,optimized deformation process,and rarely changed the hydration process.The engineering field experiment results showed that the temperature rise was reduced by 4.5℃,the average expansion deformation was increased by 206.7%in temperature rise stage,and the average shrinkage deformation was decreased by 27.5%in temperature drop stage by the multiple regulation on the moisture,hydration and expansion process,it provides a new approach to solve the shrinkage cracking of structures which facing a larger difficulty to inhibit cracking.
super absorbent polymerhumidityhydrationshrinkage compensationcrack control
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