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Corresponding Author

El Ahwal, Rana

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

This investigation aimed to study two phases. (Phase I) was to study the properties of reactive powder concrete (RPC) produced by two different curing regimes, namely, water curing at 20 oC and hot water curing at 60 oC. Moreover, the effect of using the RPC as a repair and strengthening materials (combined system) was also evaluated (Phase II). Different parameters include water to binder ratio and fiber types were considered. Based on the test results of the primary study (Phase I) of the RPC mixes, mixes of adequate flow and high compressive strength (with water curing 20 oC) were selected and used for both strengthening and repairing processes. The RPC as repair materials were evaluated by the compressive, flexural and bond (splitting and slant shear) strengths. The test results of Phase I showed that the RPC with compressive strength up to 110 and 140 MPa can be obtained in water curing at 20 oC and hot water curing at 60 oC, respectively. The test results of Phase II showed that the RPC displays excellent repair and retrofit potential on compression, flexure strengthening and possesses high bond strength as compared to substrate normal concrete (NC). The ratio of the increase of compressive strength of cylindrical specimens with 10 and 25 mm of wrapping with RPC are in the range of 25% to 114% and 42% to 142%, respectively as compared to substrate NC.

Keywords

Reactive Powder Concrete; concrete properties; repair materials; Wrapping; slant shear strength

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