Evaluation of polyurethane resin injection for concrete leak repair

Safan, Mohamed A.; Etman, Zeinab A.; Konswa, Alaa

doi:10.1016/j.cscm.2019.e00307

Cited by 17 publications

(5 citation statements)

References 1 publication

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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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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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“…Moreover, the higher the viscosity, the poorer the wettability of repair materials, most of which remain on the concrete surface to form thick polymers [ 18 , 19 , 20 , 21 ]. At present, the viscosity of organic repair materials is high, and it is difficult to penetrate a certain depth of concrete surface, and it is unable to complete the effective plugging of pores [ 22 ]. In addition, the surface cures to form a thick polymer film, which is easily removed, resulting in a poor repair effect.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of Repair Materials for Surface Defects in Pavement Concrete

Mao

Huang

et al. 2023

Materials

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Concrete surface defects are very complex and diverse, which is a great test for repair materials. The efficiency and durability of the repair system depend on the bonding effect between the concrete and the repair material. However, the rapid increase in system viscosity during the reaction of repair materials is an important factor affecting the infiltration effect. In the present work, the infiltration consolidation repair material was prepared, and its basic properties (viscosity, surface drying time and actual drying time, infiltration property) and mechanical properties were evaluated. Finally, the infiltration depth, film-forming thickness, and anti-spalling ability of concrete under a single-side freeze–thaw cycle are revealed. The results showed that using ethyl acetate could rapidly reduce the viscosity of the repair material, and the repair material could penetrate 20–30 mm into the concrete within 10 min. It was found by laser confocal microscopy that the thickness of the film formation after 3 days was only 29 µm. In the mortar fracture repair test to evaluate the bond strength, the bond strength of the repaired material reached 9.18 MPa in 28 days, and the new fracture surface was in the mortar itself. In addition, the freeze–thaw cycle test was carried out on the composite specimens under salt solution to verify the compatibility of the designed repair material with the concrete substrate. The data showed that the average amount of spalling was only 1704.4 g/m2 when 10% ethyl acetate was added. The penetrating repair material in this study has good infiltration performance, which can penetrate a certain depth in the surface pores and form a high-performance consolidation body, forming a “rooted type” filling.

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“…The penetration of water into concrete layers, which are in the form of liquid and moisture can affect the durability of the building such as floor and wall structures. There are many factors that cause the problem of concrete leakages such as a piping bursting, deterioration of waterproof membrane, a presence of a concrete crack, and the quality of materials used in construction [1]. [2] stated that piping burst is an example of some problem that can be immediately identifying, and some problem only can be observed after a certain period of time such as concrete crack and damage of the waterproofing layer.…”

Section: Introductionmentioning

confidence: 99%

Surface Temperature Profile of Cement Mortar with Infiltrated Water

Dina

Anting

Siang

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Leakage detection in concrete is one of interesting field materials engineering. The conventional approach such as using ultrasonic device, are only effective to identify the source due to piping burst. However, leakage due to crack and microcrack that presence in the concrete slab is hard to detect, and its effect only can be observed after long period of time. The objective of this paper is to investigate the temperature profile of mortar with infiltrated water. This experimental work is conducted by using a mortar with the size of 200 mm x 200 mm with the thickness of 50mm. The surface temperature was measured at the bottom part of the mortar, at five designated locations. The temperature measurement was recorded using data logger Graphtec GL200, for every 5 minutes, continuously for 6 hours. The results obtained that p-value of the surface temperature of the mortar surface was 0.3 greater than α = 0.05. Therefore, with 95% number of confident, the null hypothesis of the surface temperature was cannot be rejected. So, we confidently believe that there was enough evidence to accept the null hypothesis. Other than that, the correlation coefficient also found all of the correlation, R2 of the samples was positively strong in between ±0.05 to ±1. As a conclusion, the hypothesis of the experiment was accepted because there was no significantly difference between the surface temperature of the mortar.

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Evaluation of polyurethane resin injection for concrete leak repair

Cited by 17 publications

References 1 publication

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

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

Preparation and Performance of Repair Materials for Surface Defects in Pavement Concrete

Surface Temperature Profile of Cement Mortar with Infiltrated Water

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