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

Fan, Jun; Wu, Lili; Zhang, Bo

doi:10.3390/ma14051057

Cited by 31 publications

(9 citation statements)

References 36 publications

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“…It first increased and then decreased with the decrease of WUHPC strength. Taking the interval time of 0 h as an example, the splitting tensile strengths of U1, U2, and U3 were 1.66 MPa, 1.98 MPa, and 1.82 MPa, respectively, which were close to the results by Fan [ 44 ]. Therefore, when the interval time was 0 h, the bond performance between WUHPC and NC was the best.…”

Section: Resultssupporting

confidence: 85%

Finite Element Analysis of Bonding Property and Flexural Strength of WUHPC-NC Gradient Concrete

Tian,

Ma,

Sun

et al. 2023

Materials

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Ultra-high-performance concrete (UHPC) has greater mechanical and durability performance than normal concrete (NC). Using a limited dosage of UHPC on the external surface of NC to form a gradient structure could significantly improve the strength and corrosion resistance of the concrete structure and avoid the problems caused by bulk UHPC. In this work, white ultra-high-performance concrete (WUHPC) was selected as an external protection layer for normal concrete to construct the gradient structure. WUHPC of different strengths were prepared, and 27 gradient WUHPC-NC specimens with different WUHPC strengths and interval times of 0, 10, and 20 h were tested using splitting tensile strength to reveal the bonding properties. Fifteen prism gradient specimens with the size of 100 × 100 × 400 mm and a WUHPC ratio of 1:1, 1:3, and 1:4 were tested using the four-pointed bending method to study the bending performance of the gradient concrete with different WUHPC thicknesses. Finite element models with different WUHPC thicknesses were also built to simulate the cracking behaviors. The results showed that the bonding properties of WUHPC-NC were stronger with less interval time and reached the maximum of 1.5 MPa when the interval was 0 h. Moreover, the bond strength first increased and then decreased with the decline in the strength gap between WUHPC and NC. When the thickness ratios of WUHPC to NC were 1:4, 1:3, and 1:1, the flexural strength of the gradient concrete improved by 89.82%, 78.80%, and 83.31%, respectively. The major cracks rapidly propagated from the 2 cm position to the bottom of the mid-span, and the thickness of 1:4 was the most efficient design. The results simulated by finite element analysis also proved that the elastic strain at the crack propagating point was the minimum and was easier to crack. The simulated results were in good accordance with the experimental phenomenon.

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Section: Resultssupporting

confidence: 85%

Finite Element Analysis of Bonding Property and Flexural Strength of WUHPC-NC Gradient Concrete

Tian,

Ma,

Sun

et al. 2023

Materials

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“…To support this, the VL values proposed in Table 13 can be considered. With this test, it is possible to obtain important information on the macro and micro roughness of the aggregates [ 77 ]. It depends on the internal texture of the type of rock, and this can certainly be reflected in the observed resistance values [ 78 ].…”

Section: Discussionmentioning

confidence: 99%

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

2021

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The availability of different lithology with which concrete can be packaged could create substantial questions on the differences that they can provide to the same mixture. Different kinds of aggregates were analyzed individually to investigate their main characteristics, which allowed us to package five types of concrete mixtures. These five mixtures were compared to each other through compressive strength values. Furthermore, it was considered microscopically what possible differences could exist between these different mixtures, for example, differences in the cement/aggregate reaction. The chemical characterization of the aggregates, used as the skeleton of the cement mixes, was proposed as an important investigative phase in order to better understand the differences in the geotechnical and physical-mechanical characteristics and to verify the presence of any harmful phases for the durability of the concrete.

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“…Tayeh [35], Mansour [36], and Fan [37] proposed the split test to examine the UHPC-NC interface bonding strength. As an indirect test method, the split test can overcome the shortcomings of the pull-off test.…”

Section: Split Testmentioning

confidence: 99%

Review of the Interfacial Bonding Properties between Ultrahigh-Performance Concrete and Normal Concrete

Yao

et al. 2023

Applied Sciences

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As a high-quality building material exhibiting excellent toughness and durability, ultrahigh-performance concrete (UHPC) is increasingly being used in the construction industry and as building reinforcement. During the reinforcement of existing concrete structures with UHPC, their interface is the weakest part of a structure. Interface bonding ensures the operation of two types of materials together. However, existing studies rarely report the bonding of the UHPC–normal concrete (NC) interface. Herein, the existing test methods and interface bonding mechanisms are summarized. Subsequently, the differences among relevant design codes are investigated by comparing different theoretical formulas. Important influencing factors of the reinforcement method, namely, interface roughness, fiber type and content, interface agent type and content, moisture content, existing concrete strength, cementitious material content, curing conditions, freeze–thaw cycles, and chloride ions, are also considered. Further, the enhancement mechanism of the characteristics of the UHPC–NC interface is clearly described. Finally, the shortcomings and application prospects of the interfacial bonding properties are highlighted.

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

Cited by 31 publications

References 36 publications

Finite Element Analysis of Bonding Property and Flexural Strength of WUHPC-NC Gradient Concrete

Finite Element Analysis of Bonding Property and Flexural Strength of WUHPC-NC Gradient Concrete

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

Review of the Interfacial Bonding Properties between Ultrahigh-Performance Concrete and Normal Concrete

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