Mechanical and interface bonding properties of epoxy resin reinforced Portland cement repairing mortar

Guo, Siyao; Zhang, Xu; Chen, Jizhou; Mou, Ben; Shang, Hongjing; Wang, Pan; Zhang, Lihai; Ren, Jie

doi:10.1016/j.conbuildmat.2020.120715

Cited by 115 publications

(27 citation statements)

References 32 publications

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“…VPV, volume of permeable voids days) to 0.18 (56 days) and almost leveled off after 56 days. According to the experimental work conducted by Guo et al, 55 the flexural-to-compressive strength ratio for the normal OPC mortar after 28 days was 0.17, larger than the value of 0.13 in this study. As the flexural-to-compressive strength ratio is often used as an indicator of toughness for various cementitious binders with a higher value implying a greater toughness, 27,56 the larger value of OPC-based mortar compared to that of the AASF counterpart shows that pure OPC-based binder has a higher toughness than that of the latter.…”

Section: Mechanical Propertiescontrasting

confidence: 75%

A comparison between alkali‐activated slag/fly ash binders prepared with natural seawater and deionized water

Ren

Sun

et al. 2022

J Am Ceram Soc.

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In this research, the effects of natural seawater (SW) on the properties of alkali‐activated slag/fly ash (AASF) are studied. AASF prepared with deionized water is set as the reference mixture. The results showed that the use of natural SW resulted in a prolonged setting time and lower heat release, but no obvious impact on the flowability of AASF specimens. The long‐term compressive strength became higher when SW was used, whereas the corresponding flexural strength and fractural toughness turned lower. The use of SW induced the formation of new products that were not identified in the reference mixture, such as Cl–hydrocalumite and gypsum. In addition, it is evidenced that the dissolution of fly ash (FA) particles was significantly delayed with the incorporation of SW. All these results were related to the various ions introduced by the natural SW and their interactions with the alkaline activator as well as the precipitation of salts on slag and FA surfaces or in the matrix.

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Section: Mechanical Propertiescontrasting

confidence: 75%

A comparison between alkali‐activated slag/fly ash binders prepared with natural seawater and deionized water

Ren

Sun

et al. 2022

J Am Ceram Soc.

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“…Due to heavy traffic loads and various environmental conditions, the concrete structure is damaged by increasing service life [1,2]. It is very important to use repair materials to restore concrete structures' performance [3,4]. At present, due to its fast setting time, high early strength, and bond strength with the old concrete, magnesium phosphate cement (MPC) is often used for the fast repairing of the concrete structure [5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Various Curing Conditions on Volume Stability of Magnesium Phosphate Cement

Lai

Deng

et al. 2021

Advances in Materials Science and Engineering

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Magnesium phosphate cement (MPC) is an excellent repair material for civil and road engineering, but its volume stability under various environmental conditions significantly influences these applications. In this study, the volume stability of MPC under different curing conditions (e.g., air, standard, and water curing) is investigated. Moreover, the phases, weight loss, microstructure, and pore structure of the samples have been determined by X-ray diffraction, thermogravimetry, scanning electron microscopy, and Brunnauer–Emmet–Teller method. The results show that MPC will shrink by 8 × 10−4 under air-curing conditions. At the same time, MPC will expand by 9 × 10−4 under water-curing and standard curing conditions, which means that curing conditions influence the volume stability of MPC. Not only that, compared with air-curing conditions, the compressive strength of MPC under standard curing and water-curing conditions will decrease by 30% and 60%, respectively, which implies that greater humidity will reduce the mechanical properties of the repair material. Therefore, air curing is the best curing condition for MPC. To get a better repair effect, the environment should be avoided as much as possible in a humid state. The microscopic analysis results show that the volume expansion of MPC is related to hydration products, and the volume shrinkage occurs owing to drying shrinkage caused by internal moisture evaporation.

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“…It has been reported that in general the greater the flexural-to-compressive strength ratio, the higher the fractural toughness of cementitious binders. 21,36,37,65 The effect of different amounts of TiO 2 − RGO or RGO on the flexural-to-compressive strength ratio of the OPC mortars at 28 days is described in Figure 8. Obviously, there was an optimal amount of TiO 2 −RGO or RGO, which was 0.03 wt %, leading to the highest flexural-tocompressive strength ratio (0.159) in this study.…”

Section: Resultsmentioning

confidence: 99%

Effects of TiO₂-Modified RGO Composites on the Mechanical and Durability Properties of Ordinary Portland Cement Mortars

Guo

Zhang

et al. 2022

ACS Appl. Nano Mater.

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Various applications of graphene-based materials in construction are an alternative to improve the properties of ordinary Portland cement (OPC)-based binders. This paper used a titanium dioxide in situ intercalation method to enhance the dispersibility of reduced graphene oxide (RGO) and then explored the effects of the incorporation of the obtained TiO 2 −RGO composite and RGO on the mechanical and durability-related properties of the OPC-based binders. Experimental results showed that TiO 2 was successfully intercalated into the RGO layers and could improve the dispersion of RGO in water or synthesized OPC pore solution significantly, probably due to the greater spacing between each RGO layer. Besides, a proper amount of TiO 2modified RGO composite (0.03 wt % in this study) could elevate the mechanical strengths of OPC mortars, evidenced by a large increment of 24.78% and up to 34.94% in the compressive strength and flexural strength, respectively. The TiO 2 −RGO composite led to higher flexural-to-compressive strength ratios with the given dosages (0.01−0.05 wt %), implying a higher fractural toughness. Moreover, the resistance of the enhanced OPC-based mortars toward chloride attacks and freeze−thaw cycles was significantly improved. Based on the microstructural analyses including scanning electron microscopy and X-ray diffraction results, it is found that the modified RGO could to some extent promote the hydration of OPC and densify the overall microstructure of bulk specimens, leading to enhanced mechanical and durability properties. Compared to normal RGO, the TiO 2 −RGO composite was more effective in enhancing the properties of OPC mortars, due in large part to its better dispersion state.

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Mechanical and interface bonding properties of epoxy resin reinforced Portland cement repairing mortar

Cited by 115 publications

References 32 publications

A comparison between alkali‐activated slag/fly ash binders prepared with natural seawater and deionized water

A comparison between alkali‐activated slag/fly ash binders prepared with natural seawater and deionized water

Effects of Various Curing Conditions on Volume Stability of Magnesium Phosphate Cement

Effects of TiO₂-Modified RGO Composites on the Mechanical and Durability Properties of Ordinary Portland Cement Mortars

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Mechanical and interface bonding properties of epoxy resin reinforced Portland cement repairing mortar

Cited by 115 publications

References 32 publications

A comparison between alkali‐activated slag/fly ash binders prepared with natural seawater and deionized water

A comparison between alkali‐activated slag/fly ash binders prepared with natural seawater and deionized water

Effects of Various Curing Conditions on Volume Stability of Magnesium Phosphate Cement

Effects of TiO2-Modified RGO Composites on the Mechanical and Durability Properties of Ordinary Portland Cement Mortars

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Product

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Effects of TiO₂-Modified RGO Composites on the Mechanical and Durability Properties of Ordinary Portland Cement Mortars