Research On Experimence Of Bond Performance Between Steel Bar And Fly Ash Concrete

Presently, the application of fly ash concretes is increasingly prevalent. But the research on bonding properties of fly ash concretes is eventually few. The bonding conclusion of ordinary concrete and reinforce is imposed on the fly ash reinforced concrete inappropriately. Thus, there is a significant importance in studying on fly ash concretes.Based on the direct pull-out empirical method, the paper research on bonding performance of fly ash concretes. By analyzing test data , the curves of freeslip and loadslip, the curves of bond stress-freeslip, the curves of reinforced strain-anchorage location and the curves of bond stress-anchorage location, a formulation of the largest bond stress was got. Coinstantaneously,the impacts of the percentage of fly ash, concrete strength and steel diameter on bonding stress were worked out. The experiment illuminated that appropriate percentage of fly ash can improve the bond stress between steel bar and concrete. While the percentage is 20, the ultimate bond stress and the largest slip are both considerable. As the concrete strength increasing , the bond stress between steel bar and concrete was elevated . With great diameter of steel bar, the simples were destroyed under low load.