MATERIAL PROPERTIES OF SHOTCRETE MIXED WITH PVA SHORT-FIBRE AND MICRO HOLLOW GRANULAR FOR REPAIRING AND REINFORCING OF EXISTING CONCRETE STRUCTURES

Abstract

In this study, in order to develop a rational and economical shotcrete method for repairing and reinforcing of existing concrete structures, a new mixing method with polyvinyl alcohol (PVA) short-fibre and micro hollow granular into shotcrete used for slope protection works was proposed and its applicability for practical use was investigated by conducting freeze thaw test and material strength test. From this study, it is confirmed that: (1) mixing PVA short-fiber and micro hollow granular into normal shotcrete, freeze thaw stability and tensile ductility of the shotcrete can be better improved; and (2) the proposed method can be applied for practical use for reinforcing the existing concrete structures.