1.Location : This project located in north mountain city of Canton province, across over the Qujiang river. Considering that the temperature variation in different seasons is quite obvious, the bridge designer try to strengthen the concrete to resist the aging effect caused by both water level variation and temperature changing. Cementaid Caltite system were used in the main Pile caps with the dosage of 20lt/m3. And the water absorption rate was controlled below 1.2% by the BS 1881 test method accordingly. 2.Features : Lower the water absorption of the pile cap,resist the aging by dry-wet cycle and freeze thaw cycle,Simple and fast construction, low maintenance and construction cost, fundamentally solve the long-term durability problem of reinforced concrete.