Evaluation of Bond Strength between Normal Concrete Substrate and Ultra High Performance Fiber Concrete as a Repair Material

Tayeh, Bassam A.; Bakar, B.H. Abu; Johari, Megat Azmi Megat; Voo, Yen Lei

doi:10.1016/j.proeng.2013.03.050

Cited by 155 publications

(71 citation statements)

References 6 publications

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“…Other surface preparation such as grinding, wire-brushing, drill holes, and etc is done by some researchers. Bassam et al [18] indicate that low bond strengths were obtained with substrate surfaces treated by this method except for sand blasting. Chemical products are also used to increase the substrate surface roughness.…”

Section: Surface Preparationmentioning

confidence: 99%

Review on Potential of Geopolymer for Concrete Repair and Rehabilitation

et al. 2016

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Abstract. Cracking, spalling, surface deterioration, seepage and other concrete damage of the existing infrastructure have raised concern among residents, local authorities and developers. Dealing with concrete infrastructure rehabilitation is an important issue due to most of infrastructures today are concrete based. To simply patch up the spalling concrete as temporary solution and sooner or later, the cracks will return to haunt. This paper reviewed the current research and studies on concrete repair materials, highlighting the properties of geopolymer. It covers geopolymer repair materials which addressed in the field of concrete infrastructure rehabilitation. Geopolymer had good repair characteristics and displays the potential as an excellent repair material.

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Section: Surface Preparationmentioning

confidence: 99%

Review on Potential of Geopolymer for Concrete Repair and Rehabilitation

et al. 2016

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“…Regarding the former, several tests indicate perfect monolithic behaviour for R-UHPFRC-RC, obtained by means of concrete surface preparation (high pressure water jet or sand blasting), exhibiting no debonding between layers [6], [19]. Although it is recommended that new materials feature similar characteristics when combined with original concrete elements in order to achieve composite performance, a number of reasons support the functionality of the mechanism composed by a layer of UHPFRC on top of concrete.. Firstly, in the elastic domain, the difference in the E modulus (55 GPa for UHPFRC versus 35 GPa for normal concrete) is compensated by the aforementioned improved tensile strength.…”

Section: General Propertiesmentioning

confidence: 99%

The use of Ultra High Performance Fibre Reinforced cement-based Composites in rehabilitation projects: a review

Martín-Sanz¹,

Chatzi²,

Brühwiler³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Ultra High Performance Fibre Reinforced cement-based Composites (UHPFRC) form a novel material developed over the last two decades. A set of special traits, such as durability, outstanding material properties, and ease of application, render UHPFRC particularly attractive for the improvement (rehabilitation, strengthening) of concrete structures. Laboratory tests indicate a compressive strength, which ranges from 150 to 200 MPa, while tensile strength lies in the range of 7-15 MPa. The fibres play an important role in defining the range of these properties depending on the content (3-6%), orientation, length and composition. As a consequence, UHPFRC delivers a workable material whose mechanical properties may be properly adjusted according to the desired application scheme. As indicated via laboratory testing and in-situ experience, the durability of the structure may be extended not only due to the properties of UHPFRC but also due to the additional protection it offers to the reinforcement. This paper provides an overview on existing findings of UHPFRC implementations, focusing in the domain of improvement of structures. Within this context, UHPFRC may be applied on top of existing bridge decks [1],with or without steel rebars, ensuring full bond conditions via mere surface preparation prior to casting. In exploiting the attributes of UHPFRC within a rehabilitation context, further applications are being explored, such as strengthening of orthotropic steel decks in order to prevent fatigue issues [2]. Nonetheless, it should also be acknowledged that certain aspects need to be improved such as the development of a multi scale analysis framework, able to provide a detailed computational method without detriment to time efficiency. The introduction of monitoring technologies in structures with UHPFRC would unquestionably provide valuable insight into its long-term performance and help validate this scheme for the next generation of rehabilitation interventions.

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“…The mechanical properties of the repair material, the properties of the bonding agent, the type of surface treatment chosen between the old structures and the repair material are key factors in the rehabilitation process . Many researchers have thoroughly investigated various types of surface treatments and layering techniques for the purpose of rehabilitation . They indicated that 50% of the rehabilitated works usually fail due to the separation between the old concrete and the repair material.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, concrete should be dense and impermeable to prevent the attack of these destroying agents . One of the advantages of using ultra‐high performance fiber concrete (UHPFC) as a repair material is that it possesses extremely low fluid transport properties enabling it to withstand harsh environmental conditions . The investigation of UHPFC as a repair material was pioneered by Tayeh .…”

Section: Introductionmentioning

confidence: 99%

Fluid transport properties of normal concrete substrate and a new green fiber reinforced concrete overlay composite

Hassan

Sabah

Bunnori

et al. 2019

Structural Concrete

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The fluid transport properties of normal concrete (NC) substrate as old concrete and ultra-high performance fiber reinforced concrete called Green Universiti Sains Malaysia Reinforced Concrete (GUSMRC) as a repair material were investigated.GUSMRC is a new green concrete in which 50% of its volume contains ultra-fine palm oil fuel ash. The NC substrate surfaces were first subjected to different surface treatments (grinding and sand-blasting) prior to casting the GUSMRC repair material to form the NC/GUSMRC composite. The GUSMRC was bonded to the old concrete using the overlay and half-half layering conditions. The fluid transport properties of the monolithic GUSMRC (repair material) were also assessed. Results showed that GUSMRC has a high resistance against fluid and gas penetration and can be employed as a repair material to enhance the old concrete impermeability. The overlay layering condition improved the NC/GUSMRC composite impermeability by 2-2.8 times more than the half-half layering, and the surface treatment method had a negligible impact on the composite impermeability. K E Y W O R D S fluid transport properties, layering condition, palm oil fuel, repair material, surface treatment

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Evaluation of Bond Strength between Normal Concrete Substrate and Ultra High Performance Fiber Concrete as a Repair Material

Cited by 155 publications

References 6 publications

Review on Potential of Geopolymer for Concrete Repair and Rehabilitation

Review on Potential of Geopolymer for Concrete Repair and Rehabilitation

The use of Ultra High Performance Fibre Reinforced cement-based Composites in rehabilitation projects: a review

Fluid transport properties of normal concrete substrate and a new green fiber reinforced concrete overlay composite

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