Publication: Efficient curing technique and optimum thickness of UHPFRC overlay for concrete repair
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Date
2022-04-01
Authors
Haroon, Aysha
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Abstract
UHPFRC is a new material which is superior in performance and is gaining research interest, particularly in the field of repair and restoration due to its good bonding behaviour with that of the repaired concrete. The performance of the UHPFRC is greatly enhanced by the application of elevated curing temperature and researchstudies have presented strong evidence towards this fact. The application of elevated curing techniques to UHPFRC, when it is being used as a repair overlay is not addressed yet. There is a need to understand this, since the performance of the UHPFRC repaired composite is greatly dependent on the property of UHPFRC repair overlay. Hence, this study was intended to evaluate the efficient curing technique of the composite with UHPFCR overlay. The hot water curing and steam curing were applied along with normal moist curing so as to relate their performance. The hot water curing presented better performances in compression, flexure and shear, and can be recommended for curing of UHPFRC overlays composites. Also, the thickness of the repair UHPFRC overlay is a matter of prime concern with the purpose of bringing down the additional weight and total cost implication of the repair material. Therefore, this study also included the optimisation of the UHPFRC overlay thickness required for restoration of the normal concrete. It was found that 20 mm of UHPFRC overlay was sufficient to repair and restore the original strength of the normal concrete. Also, the gain in strength of UHPFRC and the composite with the application of accelerated/ elevated temperature curing has been discussed with regard to its microstructural enhancement.