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Effect of MgO and hybrid fiber on bond strength between reactive powder concrete and old concrete

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Document pages: 13 pages

Abstract: In this paper, reactive powder concrete (RPC) is used as concrete repair material. The effects of steel fiber, steel fiber + MgO and steel fiber + MgO + polypropylene fiber (PPF) on the mechanical properties of RPC repair materials and the splitting tensile strength between RPC and old concrete were studied. The effects of steel fiber, magnesium oxide and PPF on splitting tensile strength were further studied by scanning electron microscope (SEM) and dry shrinkage test. The results show that the compressive strength and flexural strength of the composites increase with the increase of steel fiber volume fraction. However, with the increase of steel fiber volume fraction, the bond strength shows a trend from high to low. Although MgO leads to the decrease of mechanical properties of RPC, it improves the mechanical properties of RPCed bonding strength between RPC and existing concrete. The influence of PPF on the mechanical properties of RPC was not obvious, whereas it further improved bonding strength by significantly reducing the early age shrinkage of RPC. Finally, the relationship of drying shrinkage and splitting tensile strength was studied, and the equation between the splitting tensile strength relative index and logarithm of drying shrinkage was obtained by function fitting.

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