Influence of cationic epoxy resin type on electrophoretic deposition effect on repair of rust-cracked reinforced concrete

Wang, Yueming; Wang, Changdan; Zhou, Shunhua; Liu, Kaiwei

doi:10.1016/j.conbuildmat.2022.126714

Cited by 16 publications

(6 citation statements)

References 33 publications

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“…Te chemical grouting materials mainly include polyurethane and epoxy resin. When chemical grouting is used, it can both bond the crack part and play a water-stopping role, and it is suitable for cracks with a fne width [26]. Te current study on grout mainly focuses on penetrability [27][28][29]; however, the strength of stone is also signifcant.…”

Section: Introductionmentioning

confidence: 99%

“…Although cement is widely used in buildings, it has the disadvantages of low compressive strength, poor tensile strength, and high porosity [33]. Epoxy resin is a thermosetting material often used as a binder and for other functional materials, is often used in the military and packaging engineering industries, and is involved in civil engineering and other felds [26]. When the external stress is too large, the cement material easily breaks up, and the strength is greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

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Strength Recovery Effect of Bisphenol A Epoxy Resin E44 on Rock Masses with Various Crack Widths

Zhou

Zhang

et al. 2023

Advances in Civil Engineering

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As a desirable bonding and repair material, epoxy resin combined with other materials is widely used in civil engineering, but its application in underground rock engineering is still limited compared with the wide use of cement grout. To explore and optimize the effect of room temperature-cured bisphenol A epoxy resin E44 on the strength recovery of rock samples with cracks of various widths, the uniaxial compressive strength (UCS) of epoxy resin was studied and the mass ratio of the curing agent to epoxy resin ( k C E ) was adjusted and optimized. On this basis, the UCS of the selected epoxy resin was investigated by adding diverse amounts of ethanol so that the ratio corresponding to the repair material with better mechanical properties could be selected. Artificial cracks of various widths were filled with the optimized materials, and then, a UCS test was conducted on the repaired rock samples to evaluate the effect on strength recovery and compare it with that of ultrafine Portland cement (UPC). The results show that the UCS of epoxy resin stones increases when k C E ≤ 0.25 and decreases when k C E > 0.25, reaching a peak of 92.41 MPa. Furthermore, as the mass ratio of ethanol to curing agent and epoxy resin ( k A ) increases, the UCS increases to 94.65 MPa for k C E = 0.25 and k A = 0.01. The crack width influences the UCS of the repaired rock mass. With increasing crack width, the effect of epoxy resin on recovery continuously improves, whereas that of UPC shows the opposite trend. Compared with UPC, epoxy resin has an overwhelmingly greater effect on strength recovery. For instance, for a 3 mm-wide crack, the recovered UCS for 28 d epoxy resin is 83.48 MPa, with much larger peak strains, and the strength recovery rate ( k r ) is 77.55%; however, the k r of UPC is only 15.12%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strength Recovery Effect of Bisphenol A Epoxy Resin E44 on Rock Masses with Various Crack Widths

Zhou

Zhang

et al. 2023

Advances in Civil Engineering

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“…So far, there are two main types of materials used for crack repair. One is polymer-based repair agents [1][2][3], such as epoxy, polyurethane, polyacrylate, etc. The components of the polymer are transferred into cracks by means of injection or grouting, and in-situ polymerization then occurs inside the crack and the formed polymer filled/repaired the crack.…”

Section: Introductionmentioning

confidence: 99%

Repair of concrete existing micro-cracks by use of microbially induced carbonate precipitation

Wang

Gao

2023

MATEC Web Conf.

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Micro-crack is the start of concrete deterioration and failure, though it does not decrease the bearing capacity in the beginning. In order to prolong the service life of existing concrete structures, it is important to repair the existing micro-cracks before they develop into large cracks, which are much more harmful. Bio-genic CaCO3 from microbially induced carbonate precipitation (MICP) process is proved to be a promising crack repair material due to its environmental friendliness and super compatibility with cementitious matrix. In this study, MICP based repair technology was applied to repair micro-cracks. The influence of crack environment and repair technique on the precipitation of bio-CaCO3 was investigated. Results shown that moderate alkali pH had limited effect on the properties of bio-CaCO3. Bacteria could still induce the CaCO3 precipitation in crack if it was saturated with Ca2+ containing deposition medium. Crack of a width 0.5mm can be fully sealed within 3 days by use of a controlled injection technique.

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“…In recent decades, a growing development in the concrete repair industry has been to generate various repair systems, including cement repair systems [6,7], polymer repair systems [8,9], cement-polymer composite repair systems [10,11], steel plate bonding repair systems [12], and fiber-reinforced repair systems [13]. Among these, epoxy concrete has gained widespread popularity due to its superior mechanical properties, chemical stability, construction operability, and higher bond strength, as compared to other repair systems [14,15]. However, a solvent-based epoxy resin is commonly employed as polymer in epoxy concrete.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance and Strengthening Mechanism of Polymer Concretes Reinforced with Carbon Nanofiber and Epoxy Resin

Li,

Liu,

Gao

et al. 2023

Coatings

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To address the issues of the brittleness, low tensile strength, insufficient bond strength, and reduced service life associated with ordinary cement concrete being used as a repair material, a water-based epoxy (WBE) and carbon-nanofiber-reinforced concrete composite repair material was designed, and the mechanical properties, bonding performance, and durability of the concrete modified using WBE and carbon fiber under various WBE contents were investigated and evaluated. In this paper, a self-emulsifying water-based epoxy curing agent with reactive, rigid, flexible, and water-soluble chains was obtained via chemical grafting, involving the incorporation of polyethylene glycol chain segments into epoxy resin molecules. The results demonstrated that a WBE has a contributing effect on improving the weak interfacial bond between the carbon fiber and concrete; moreover, the composite admixture of carbon fiber and WBE improves the mechanical properties and durability of concrete, in which the composite admixture of 1% carbon fiber and 10% WBE has the best performance. The flexural strength and chlorine ion permeability resistance of concrete were slightly reduced after more than 10% admixture, but bond strength, tensile strength, compressive strength, dry shrinkage resistance, and frost resistance were promoted. The addition of WBE significantly retards the cement hydration process while greatly improving the compactness and impermeability of the concrete. Furthermore, the combined effects of WBE and carbon fiber effectively prevented the generation and expansion of cracks. The interaction mechanism and microstructure evolution between the WBE, carbon fiber, and cement hydration were described by clarifying the mineral composition, organic–inorganic interactions, the evolution of the hydration products, and composite morphology at different scales. Carbon fiber and WBE exhibited synergistic effects on the tensile strength, ductility, and crack resistance of concrete. In the formed three-dimensional network structural system of concrete, the WBE formed an organic coating layer on the fiber surface and provided fiber protection as well as interfacial bonding reinforcement for the embedded cement particles.

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Influence of cationic epoxy resin type on electrophoretic deposition effect on repair of rust-cracked reinforced concrete

Cited by 16 publications

References 33 publications

Strength Recovery Effect of Bisphenol A Epoxy Resin E44 on Rock Masses with Various Crack Widths

Strength Recovery Effect of Bisphenol A Epoxy Resin E44 on Rock Masses with Various Crack Widths

Repair of concrete existing micro-cracks by use of microbially induced carbonate precipitation

Mechanical Performance and Strengthening Mechanism of Polymer Concretes Reinforced with Carbon Nanofiber and Epoxy Resin

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