The relationship between substrate roughness parameters and bond strength of ultra high-performance fiber concrete

Ultra high performance fiber concrete (UHPFC) is an advanced formula concrete that is proven to be more superior than conventional concrete because it embrace the qualities of steel and concrete. Therefore UHPFC properties which include high durability and strength are fully exploited in the research of rehabilitation and strengthening in concrete and even non-concrete structures. This article presents the findings of an experimental study carried out to examine the bonding strength behaviour between normal concrete (NC) substrate and UHPFC as a repair material, under flexural strength test by using third-point loading beam test method. Three types of NC substrate surface preparation were used: as-cast (without surface preparation) as a reference, wire-brushed, and sand-blasted. The flexural test results clearly indicated that all failures occurred through the NC substrate and no de-bonding was observed in the interface between NC substrate and UHPFC. The results of the flexural strength confirmed that adhesion bond strength between NC substrate and UHPFC was stronger than the substrate regardless, the substrate roughness. This proves that UHPFC is able to link and bond strongly with the substrate.

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Evaluation of bond strength between normal concrete and high performance fiber reinforced concrete (HPFRC)

MATEC Web of Conferences ◽

10.1051/matecconf/201819501015 ◽

2018 ◽

Vol 195 ◽

pp. 01015

Author(s):

Nur Adibah Ayuni Abd Malek ◽

Khairunnisa Muhamad ◽

Mohd Zulham Affandi Mohd Zahid ◽

Nur Ain Hamiruddin ◽

Norrazman Zaiha Zainol ◽

...

Keyword(s):

Reinforced Concrete ◽

Bond Strength ◽

High Performance ◽

Surface Preparation ◽

Fiber Reinforced Concrete ◽

Repair Material ◽

Normal Concrete ◽

High Performance Fiber ◽

Water Curing ◽

Curing Method

High Performance Fiber Reinforced Concrete (HPFRC) has been proposed to be used as a repair material for the deterioration of concrete structure since its very low porosity that leads to a low permeability and high durability. This characteristic makes it suitable for rehabilitation and retrofitting reinforced concrete structures or for as a new repair material. The bond strength between HPFRC and old concrete should have a good bond strength, thus surface preparation method and curing method can help strengthen the bond strength between HPFRC and normal concrete. This paper was performed to study the effect of surface preparation and curing method on the bond strength between HPFRC and normal concrete. In this study, three surface preparations were prepared: sandblasting, grooved and drill hole. Then, the curing methods that were performed in this study are ambient curing and water curing. The tests that were conducted to evaluate the bond strength between HPFRC and normal concrete are slant shear test and splitting tensile test. The result from this study shows that sandblasting gave the highest bond strength result between normal concrete and HPFRC. For the curing method, water curing gives the highest bond strength between normal concrete and HPFRC.

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