Development Of Mix Proportion Design System For High Performance Expansive Concrete

The past several years had witnessed the rapid development of CFST arch bridge for its superior in structure which had solved both the problems of hoisting in construction and span successfully. But its mechanical characteristics and load capacity are deadly decreased by the separation of concrete and steel due to concrete shrinkage and etc. Nowadays, separation of CFST arch bridge has become a problem demanding prompt solution. Many researchers believe that filling High Performance Expansive Concrete (HPEC) into the tube is one of the solutions, but it is difficult to gain concrete that match the need of construction for its time consume and uneconomic because much experiments are needed. Hence, it is necessary to develop a method in need and indeed for the mix proportion design.Based on the Science and Technology Project of West Communication Construction (contract No: 200631881422)——Experimental Study on Application of Self-stressed CFST, a mix proportion design system for HPEC of CFST arch bridge has developed by the using of"All Calculated"method via Microsoft Excel VBA. The system provides correctly mix proportion after the design strength; cement strength and some anther parameters are inputted, as long as percentages map of compositions'weights. It also provides mix proportion data of real bridges for users to consult. The correction of this system has been confirmed by the well agree with the mix proportion used in the 50 real bridges that collected by the author. Also, same reasonable parameters of the HPEC mix proportion for CFST arch bridge have presented after the attentively analysis of all the 50 real bridges. At the last of the paper, assumptions on mix proportion have provided based on the shortages of the paper.