Evaluation of Bond Properties in Concrete Repair Materials

Kunieda, Minoru; Kamada, Takenobu; Uchida, Yoshiyuki; Rokugo, Keitetsu

doi:10.1061/(asce)0899-1561(2001)13:2(98)

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…For patch repair, 30% of the failures are due to cracking, 25% due to debonding, 25% due to corrosion issues and 20% due to other failure mechanisms [4]. Debonding thus is a major factor in the overall failure of repair works [5].…”

Section: Introductionmentioning

confidence: 99%

Applying a biodeposition layer to increase the bond of a repair mortar on a mortar substrate

Snoeck

Wang

Bentz

et al. 2018

Cement and Concrete Composites

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One of the major concerns in infrastructure repair is a sufficient bond between the substrate and the repair material, especially for the long-term performance and durability of the repaired structure. In this study, the bond of the repair material on the mortar substrate is promoted via the biodeposition of a calcium carbonate layer by a ureolytic bacterium. X-ray diffraction and scanning electron microscopy were used to examine the interfaces between the repair material and the substrate, as well as the polymorph of the deposited calcium carbonate. The approximately 50 μm thick biodeposition film on the mortar surface mostly consisted of calcite and vaterite. Both the repair material and the substrate tended to show a good adherence to that layer. The bond, as assessed by slant shear specimen testing, was improved by the presence of the biodeposition layer. A further increase was found when engineering the substrate surface using a structured pattern layer of biodeposition.

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Section: Introductionmentioning

confidence: 99%

Applying a biodeposition layer to increase the bond of a repair mortar on a mortar substrate

Snoeck

Wang

Bentz

et al. 2018

Cement and Concrete Composites

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“…The presence of air bubbles and pollutants lowers the adhesion in the contact zone, in line with the weak boundary layer model and Bikerman’s classification. Bikerman’s model, although criticized, accounts for the poor adhesion in the indicated areas as weak interfacial bonding [ 62 ].…”

Section: Discussionmentioning

confidence: 99%

Wettability of Asphalt Concrete with Natural and Recycled Aggregates from Sanitary Ceramics

et al. 2020

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In line with the current trend of seeking alternative methods for modification of the existing building composites, such as mineral–asphalt mixtures (MAMs), the materials from concrete and ceramics recycling are being used in increasingly wider applications. When added to MAMs as an aggregate, ceramic building material, which has different properties than the raw material (clay), may significantly influence the aggregate properties, including the wettability, porosity, asphalt adhesion, and consequently the mixture durability. The material’s microstructure was found using SEM. The wetting properties of mineral–asphalt mixtures were determined by measuring the contact angles (CA) of their surfaces, using water as the measuring liquid. The total surface free energy (SFE) values were determined using the Neumann method. When analyzing the research results, it can be noticed that the chemical composition of the ceramic aggregate has a significant influence on the adhesion of asphalt to its surface due to the chemical affinity. Waste ceramic aggregate, despite its acidic pH value being connected with its elevated silica content, exhibits good adhesive properties.

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“…This study found that broken slabs had 25% of the rigidity of uncracked slabs, whereas repairs restored half. Minoru et al [5] Explain that a good concrete-injection material connection restores stiffness and prevents chloride ions and water from entering. Dry and clean the crack before injecting.…”

Section: Introductionmentioning

confidence: 99%

Torsion Improvement of Reinforced Self-Compacting Concrete Beams Using Epoxy Injection and CFRP

Elsheikh,

Albo-Hassan,

Al-Zayadi

2023

Civ Eng J

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Few researchers have investigated the internal torsional reinforcement of box timbers, so little research has been conducted on this particular fortification method. The primary objective is to find out the possibility of adding a certain percentage of RCA to the NC mixtures, as well as verifying the success achieved in repairing the cracks that occurred as a result of torsion with CFRP or injecting with epoxy, which has not been addressed in previous research and literature reviews. This study reinforces reinforced SCC box columns subjected to complete torsion with CFRP sheets and epoxy resin injections. Four reinforced SCC specimens (the first beam with 0%, the second beam with 33.3%, the third beam with 67.7%, and the fourth beam with 100% RCA by weight) were subjected to pure torsion until failure. The dimensions and reinforcement of every specimen are identical. In addition, the applied torque-twist angle relationship at the midspan and end span was investigated. Bending experiments were performed to establish load-deflection curves and assess failure modes. After structural rehabilitation, all beams exhibited increased rigidity values, according to the results. Epoxy resin and CFRP sheet contributed to the specimens' increased ultimate load. The ultimate strength of RCA beams strengthened with CFRP and injected with epoxy increased. The specimens' flexural strength was considerably enhanced by the combination of surface roughness and fracture injection, and the effectiveness of using RCA was very good; it could be replaced with NCA in concrete mixtures, according to the ratio and need. Doi: 10.28991/CEJ-2023-09-11-05 Full Text: PDF

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Evaluation of Bond Properties in Concrete Repair Materials

Cited by 10 publications

References 7 publications

Applying a biodeposition layer to increase the bond of a repair mortar on a mortar substrate

Applying a biodeposition layer to increase the bond of a repair mortar on a mortar substrate

Wettability of Asphalt Concrete with Natural and Recycled Aggregates from Sanitary Ceramics

Torsion Improvement of Reinforced Self-Compacting Concrete Beams Using Epoxy Injection and CFRP

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