Abstract
The repair and strengthening of reinforced concrete members are very important due to several factors, including unexpected increases in load levels and/or the damaging impact of aggressive environmental conditions on structural concrete members. Many researchers have turned to using materials for the repair and strengthening of damaged structures or the construction of new concrete structural members. Ultrahigh-performance fibre-reinforced concrete (UHPFRC), characterized by superior structural and durability performance in aggressive environmental conditions, is one of the materials that have been considered for the repair and strengthening of concrete structural members. The repair or strengthening of concrete structures using UHPFRC needs a thorough knowledge of the behaviour of both the strengthening material and the strengthened concrete structure at service load conditions, in addition to an understanding of the design guidelines governing the use of such materials for effective repair and strengthening. In this study, the recent issues and findings regarding the use of UHPFRC as a repair or strengthening material for concrete structural members are reviewed, analysed, and discussed. In addition, recommendations were made concerning areas where future attention and research on the use of UHPFRC as a strengthening material needs to be focused if the material is to be applied in practice.
Highlights
Reinforced concrete (RC) structural members are made to efficiently support loads over the expected service life of the structural members
El-Enein et al [1] investigated the flexural behaviour of an RC slab column joint strengthened with carbon fibre-reinforced polymer (CFRP) at the tension side. e results indicated that there is an increment in the flexural capacity and stiffness of the RC slab column joint
0.13 durability [3]. erefore, a newer material was created and utilized for both the repair and strengthening of damaged or new RC structural members, which is known as ultrahighperformance fibre-reinforced concrete (UHPFRC)
Summary
Reinforced concrete (RC) structural members are made to efficiently support loads over the expected service life of the structural members. Repair of RC elements is imperative, for weakened elements and for strengthening new structural concrete elements; thereby, strengthened structural elements could safely support the design load under different aggressive environmental conditions without excessive damage. Over the last two decades, researchers have created different materials and methods for the repair of deteriorated RC members besides strengthening new concrete structural members. Investigations were directed into strengthening structural members with CFRP and came up with many helpful outcomes. El-Enein et al [1] investigated the flexural behaviour of an RC slab column joint strengthened with CFRP at the tension side. Erefore, a newer material was created and utilized for both the repair and strengthening of damaged or new RC structural members, which is known as ultrahighperformance fibre-reinforced concrete (UHPFRC). Lubbers [10] investigated the behaviour of UHPFRC under compression and flexure, and it was found that the compressive and flexural strengths of UHPFRC could be 2–3 or even 6 times more than highperformance concrete (HPC), respectively
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