Interfacial bond properties between normal strength concrete substrate and ultra-high performance concrete as a repair material

Zhang, Yang; Zhu, Ping; Liao, Zhaoqian; Wang, Lianhua

doi:10.1016/j.conbuildmat.2019.117431

Cited by 169 publications

(93 citation statements)

References 20 publications

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“…The construction industry in many countries has entered the period of maintenance and renovation [ 4 ]. The existing concrete structure is in urgent need of effectively repair for strengthening [ 5 , 6 ]. A bonding interface is thus formed between the repair material and the concrete substrate.…”

Section: Introductionmentioning

confidence: 99%

Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure

Fan

Zhang

2021

Materials

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The bonding surface structure generated by the repair of concrete structures has been paid more attention as a weak point. The effects of old concrete age, interface roughness, and freeze-thawing (F-T) attack on adhesive interface are comprehensively investigated. In this study, six kinds of interface roughness and five different old concrete age are designed. The interfacial bonding property is mainly evaluated by splitting tensile strength (fts). Fractal analysis was used to characterize the interface roughness using laser scanning data. In general, the fts increased with the increasing value of interface fractal dimension. The relationship between fts and fractal dimension value was further analyzed, considering the old concrete ages and the F-T cycles. The results show that the effect of roughness on the bonding property of new-to-old concrete is more significant than the age of old concrete, and the influence of the F-T cycles on the bonding surface is mainly reflected in the initial stage of the F-T deterioration process. The relative dynamic elasticity modulus decreased obviously under F-T cycles, especially for the specimens with low interface roughness. In combination with the results of two non-destructive methods (ultrasonic non-destructive test and relative dynamic elastic modulus test), the larger roughness and the smaller age of old concrete can improve the bond performance.

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Section: Introductionmentioning

confidence: 99%

Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure

Fan

Zhang

2021

Materials

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“…The result can be related to the high bond strength [ 15 , 53 , 54 , 55 , 56 , 57 ]. It can be assumed also that the ITZ could possibly undergo further densification due to a low hydration degree and ongoing pozzolanic reactions of silica fume leading to an improved bond strength [ 7 , 58 , 59 , 60 , 61 ]. In addition, the used limestone powder could promote formation of carboaluminate and C-S-H, [ 62 ].…”

Section: Resultsmentioning

confidence: 99%

“…The pull-off test was performed to measure the interfacial bond strength between the substrate concrete and the repair UHPC overlay. This test is a conventional way to analyze the bond strength, as it neglects the friction between interfacial surfaces or any other form of stresses [ 7 , 42 ]. The bond strengths of the two composite column specimens cast against different formworks were analyzed according to the standard ASTM C1583 [ 43 ].…”

Section: Methodsmentioning

confidence: 99%

“…Ultra-High Performance Concrete (UHPC) is one of the most promising materials for such applications [ 1 ]. Its high compressive strength (>150 MPa), tensile strength (>8 MPa) combined with enhanced flowability, and very dense microstructure are the key characteristics [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. However, an application of UHPC as an overlay on an old deteriorated concrete raises the question about the strength and long-term effects of the interfacial transition zone between new and old concrete (ITZ).…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al evaluated the interfacial bond properties between UHPC and normal strength concrete (NSC) having various moisture degrees and substrate roughnesses using slant shear, split tensile, and direct tensile test. Results showed that rough and adequately wetted surfaces of the substrate concrete lead to a much higher bond strength when compared to a smooth substrate [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

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Eco-UHPC as Repair Material—Bond Strength, Interfacial Transition Zone and Effects of Formwork Type

et al. 2020

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A reduced carbon footprint and longer service life of structures are major aspects of circular economy with respect to civil engineering. The aim of the research was to evaluate the interfacial bond properties between a deteriorated normal strength concrete structure and a thin overlay made of Eco-UHPC containing 50 wt% of limestone filler. Two types of formwork were used: untreated rough plywood and surface treated shuttering plywood. The normal strength concrete elements were surface scaled using water jets to obtain some degradation prior to casting of the UHPC overlay. Ultrasonic pulse velocity (UPV), bond test (pull-off test), and Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectrometry (EDS) were used for analysis. Elements repaired with the Eco-UHPC showed significantly improved mechanical properties compared to the non-deteriorated NSC sample which was used as a reference. The bond strength varied between 2 and 2.7 MPa regardless of the used formwork. The interfacial transition zone was very narrow with only slightly increased porosity. The untreated plywood, having a rough and water-absorbing surface, created a surface friction-based restraint which limited microcracking due to autogenous shrinkage. Shuttering plywood with a smooth surface enabled the development of higher tensile stress on the UHPC surface, which led to a more intensive autogenous shrinkage cracking. None of the formed microcracks penetrated through the entire thickness of the overlay and some were partly self-healed when a simple water treatment was applied. The project results showed that application of UHPC as repair material for concrete structures could elongate the lifespan and thus enhance the sustainability.

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Interfacial cohesion model of ultra‐high performance concrete wet joints under the influence of multiple factors

Wang,

Xu,

et al. 2024

Structural Concrete

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The interfacial cohesion between precast normal concrete (NC) and cast‐in‐place ultra‐high performance concrete (UHPC) is an important index to evaluate their interfacial bond strength, which is of great importance for the application of UHPC as a connection material for precast structural bridges. Interfacial cohesion is related to several influencing factors. However, there needs to be more research on the interrelationship model between multiple influencing factors and interfacial cohesion. This study took the UHPC wet joint in a precast concrete structure as the object. First, the relationship between the interface cohesion of UHPC wet joint and substrate strength, UHPC age, interfacial roughness, interfacial moisture content, and curing method was studied; The result shows that the key factors affecting interfacial cohesion include UHPC age, interface roughness, and substrate strength, with interfacial moisture content potentially playing a secondary role. Second, the failure types of the interface zone surface by using digital image correlation (DIC) are divided into three categories. Finally, the quantitative mathematical model of interfacial cohesion under the coupling effect of multiple factors was established based on the above four factors. The model is in good agreement with the experimental data.

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Interfacial bond properties between normal strength concrete substrate and ultra-high performance concrete as a repair material

Cited by 169 publications

References 20 publications

Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure

Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure

Eco-UHPC as Repair Material—Bond Strength, Interfacial Transition Zone and Effects of Formwork Type

Interfacial cohesion model of ultra‐high performance concrete wet joints under the influence of multiple factors

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