Abstract
Ultra high performance fiber reinforced concrete (UHPFRC) is a promising new concrete, especially in repair and restoration. It has been identified to exhibit good bonding and strengthening properties with the old concrete as an overlay repair material. But its usage has not been much pronounced due to its high-cost factor which overshadows its efficacy, because certain constituents of UHPFRC are not readily and easily available. Hence, optimal usage of this concrete for repair and rehabilitation can greatly be beneficial to the construction industry. Therefore, this study is involved in identifying the optimum thickness of UHPFRC as a repair overlay material for normal concrete elements, so that the self-weight of the material can be reduced to its minimum, and indirectly the impact of its price can be greatly reduced. With this intention, normal concrete elements were repaired with different thicknesses of UHPFRC overlay starting from 15 mm to 50 mm. The repaired composite composed of normal concrete substrate and varying thickness of UHPFRC overlay were subjected to different property evaluations to identify the optimum thickness of UHPFRC overlay in compression, tension, and shear. The ideal thickness of the UHPFRC repair overlay was concluded based on its ability to restore the original strength of the old normal concrete. It was upshot that an overlay thickness of 20 mm is more than sufficient to repair and restore the normal concrete.
Highlights
Ultra High Performance Concrete (UHPC) is a group or family of materials exhibiting incredibly high compressive strength and durability
All the substrate specimens of normal concrete planned for overlaying in that particular slot had to be kept ready in the moulds with the surface preparation works very well before the mixing of the Ultra high performance fiber reinforced concrete (UHPFRC)
The best method of vibration of the composite specimen composed of old normal concrete substrate and fresh UHPFRC overlay was
Summary
Ultra High Performance Concrete (UHPC) is a group or family of materials exhibiting incredibly high compressive strength and durability. The composite is made up of cement, silica fume, fine sand, fibers, superplasticizer (SP), and water which is known as ultra-high performance fiber reinforced cementitious composite (UHPFRCC) [5]. UHPFRC is comprised of materials such as cement, silica fume, steel fiber, a replacement of coarse aggregate with finer material, and a low water binder ratio [7]. All these high performance concretes developed required costly materials and sophisticated technologies
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