Cement-Based Repair Materials and the Interface with Concrete Substrates: Characterization, Evaluation and Improvement

Song, Xuemin; Song, Xiongfei; Líu, Hao; Huang, Haoliang; Anvarovna, Kasimova Guzal; Ugli, Nurmirzayev Azizbek Davlatali; Huang, Yi; Hu, Jie; Wei, Jiangxiong; Yu, Qijun

doi:10.3390/polym14071485

Cited by 21 publications

(5 citation statements)

References 75 publications

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“…Ordinary silicate cement mortar is prone to brittle fracture and high shrinkage, which is not conducive to the compatibility between the repair mortar and the concrete pavement. In order to solve this problem, some scholars added various types of fibers or used early-strength or fast-hardening special cement for modification and optimization [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ], which greatly improved the toughness of the repair mortar and shortened the maintenance time. Another part of scholars choosed to use epoxy resin, polyurethane, methyl methacrylate and other polymers as repair materials to replace cement mortar [ 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Types of Fillers on the Performance of PMMA-Based Low-Temperature Rapid Repair Mortar

Zhu,

Xu,

Deng

et al. 2024

Materials

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In order to further optimize the performance of PMMA (Polymethyl Methacrylate) repair mortar. In this paper, fly ash, talcum powder and wollastonite powder are used as fillers to modify the PMMA repair mortar. The effects of these three fillers on the working performance, mechanical performance and durability of PMMA repair mortar were explored. The study shows that the three fillers have good effect on the bond strength of the repair mortar, in which the fly ash has the best effect on the mechanical performance. The mechanical properties of PMMA repair mortar were best when the amount of fly ash was 60 phr (parts per hundred, representing the amount of the material added per hundred parts of PMMA). At this time, the 28 d compressive strength was 71.26 MPa and the 28 d flexural strength was 28.09 MPa, which increased by 13.31% and 15.33%, respectively. Wollastonite powder had the least negative effect on the setting time of the PMMA repair mortar. When the dosage of wollastonite powder was increased to 100 phr, the setting time was only extended from 65 min to 94 min. When the talc dosage was 60 phr, the best improvement in salt freezing resistance was achieved. After 100 cycles of salt freezing, the mass loss rate and strength loss rate decreased to 0.159% and 4.97%, respectively, which were 75.1% and 37.7% higher than that of the control group. The addition of all three fillers reduced the porosity and the proportion of harmful pores in the mortar. This study contributes to a comprehensive understanding how different types of fillers affect PMMA repair mortars, and it also provides theoretical support for the further development of low-temperature rapid repair mortars.

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Section: Introductionmentioning

confidence: 99%

Influence of Different Types of Fillers on the Performance of PMMA-Based Low-Temperature Rapid Repair Mortar

Zhu,

Xu,

Deng

et al. 2024

Materials

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“…At present, repair materials commonly used in the world can be divided into three types [5]: inorganic repair material, which is the most widely used material to repair cracks in the world, mainly including sulphoaluminate cement, magnesium phosphate cement and expansive cement [6][7][8]; organic repair material, which usually refers to polymer resins such as polyurethane, epoxy and acrylate [9][10][11]; and organic-inorganic composite repair material, which combines the advantages of organic material and inorganic material in the form of polymer-modified mortar/concrete, polymer-impregnated mortar/concrete and polymer mortar/concrete [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of PVAc and Styrene on the Properties and Microstructure of MMA-Based Repair Material for Concrete

Guo

et al. 2023

Materials

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Methyl methacrylate (MMA) material is considered to be a suitable material for repairing concrete crack, provided that its large volume shrinkage during polymerization is resolved. This study was dedicated to investigating the effect of low shrinkage additives polyvinyl acetate and styrene (PVAc + styrene) on properties of the repair material and further proposes the shrinkage reduction mechanism based on the data of FTIR spectra, DSC testing and SEM micrographs. The results showed that PVAc + styrene delayed the gel point during the polymerization, and the formation of two-phase structure and micropores compensated for the volume shrinkage of the material. When the proportion of PVAc + styrene was 12%, the volume shrinkage could be as low as 4.78%, and the shrinkage stress was reduced by 87.4%. PVAc + styrene improved the bending strength and fracture toughness of most ratios investigated in this study. When 12% PVAc + styrene was added, the 28 d flexural strength and fracture toughness of MMA-based repair material were 28.04 MPa and 92.18%, respectively. After long-term curing, the repair material added with 12% PVAc + styrene showed a good adhesion to the substrate, with a bonding strength greater than 4.1 MPa and the fracture surface appearing at the substrate after the bonding experiment. This work contributes to the obtaining of a MMA-based repair material with low shrinkage, while its viscosity and other properties also can meet the requirements for repairing microcracks.

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“…Concrete will shrink and creep, incur aging deformation or corrosion, and other issues, leading to structure surface damage, load-bearing capacity decline, and unreliable safety performance [1,2]. Cement-based materials have problems with high shrinkage and low flexibility [3]. At the same time, they will cause environmental pollution during the production and construction process, which is not in line with the design concept of modern civil engineering structures [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Compared to cementitious materials, polyurethane cement composites, as a homogeneous body made of polymeric elastomer combined with inorganic cement particles, have good tensile and tear strengths, can withstand significant stresses without fracture damage, and have higher flexural strength than ordinary concrete materials [34]. (3) The density of polyurethane cement composites is about 1.45~1.62 g/cm 3 [13], while the density of cement concrete is about 2.4 g/cm 3 [35], which is 1.58~1.65 times the density of polyurethane cement composites.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Flexural Properties of Polyurethane–Cement Composites under Temperature Load

Liu

Jian

et al. 2022

Applied Sciences

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Polyurethane cement composite is a new organic–inorganic composite material with high strength, corrosion resistance, and fast curing. It is a complement and alternative to traditional cement materials. The flexural properties of polyurethane cement composites are the basic mechanical index of the material. In order to study the flexural properties under different temperature loads, a molecular model was established, the chemical reaction process of polyurethane cement and the temperature response mechanism was analyzed, and the preparation process of polyurethane cement was proposed. Then, bending tests were carried out in strain-controlled mode to obtain the specimens' bending strength and stiffness modulus under different temperature loads. The test results showed that the tensile strength of polyurethane cement decreased first, then increased, and finally decreased with the increase in temperature, while the bending stiffness modulus decreased with the increase in temperature. Combined with the theoretical derivation, the damage mode of the samples under different temperature loads was analyzed, and the “L-type” damage strain curve was obtained. The results showed that the proposed theory could effectively explain the mechanism of action and flexural properties of polyurethane cement composites under temperature loading, which is a significant improvement to the application of polyurethane cement composites in practical engineering.

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Cement-Based Repair Materials and the Interface with Concrete Substrates: Characterization, Evaluation and Improvement

Cited by 21 publications

References 75 publications

Influence of Different Types of Fillers on the Performance of PMMA-Based Low-Temperature Rapid Repair Mortar

Influence of Different Types of Fillers on the Performance of PMMA-Based Low-Temperature Rapid Repair Mortar

Study on the Effect of PVAc and Styrene on the Properties and Microstructure of MMA-Based Repair Material for Concrete

Experimental Study on Flexural Properties of Polyurethane–Cement Composites under Temperature Load

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