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Micro-structure characteristics of unsaturated polyester resin modified concrete under fatigue loads and hygrothermal environment
Highlights The microstructure evolution of UPMC under hygrothermal effect and load was studied. Hygrothermal effect aggravated the microstructure deterioration of UPMC under load. UPR depressed the crack propagation and irregularities in concrete under interaction. UPR exerted a refinement and homogenization effect on the micro-pore inside concrete. UPR conduced to the densification and reduced the thickness range with regard to ITZ.
Abstract To explore the evolution characteristics about the microstructure of unsaturated polyester resin modified concrete (UPMC) for bridge deck pavement under two regimes: the single-load action and the interaction of hygrothermal effect and fatigue load, the four-stage experimental programs were arranged. The micromorphological characteristics of micro-crack and pore structure and the micromechanical properties of interfacial transition zone (ITZ) corresponding to the cementitious composites were quantitatively characterized and evaluated through micro-structure analysis approaches and digitized image manipulation. The experimental results demonstrated that the addition of hygrothermal effect would profoundly aggravate the deterioration of crack and pore structure and expedite the ITZ expansion concerning bridge paving concretes under the action of fatigue load. Furthermore, with regard to the concrete microstructure under external action, the incorporation of unsaturated polyester resin (UPR) might restrain crack propagation and depress cracks irregularities, exert a refinement and homogenization effect on the porous structure and reduce the expansion thickness of ITZ.
Micro-structure characteristics of unsaturated polyester resin modified concrete under fatigue loads and hygrothermal environment
Highlights The microstructure evolution of UPMC under hygrothermal effect and load was studied. Hygrothermal effect aggravated the microstructure deterioration of UPMC under load. UPR depressed the crack propagation and irregularities in concrete under interaction. UPR exerted a refinement and homogenization effect on the micro-pore inside concrete. UPR conduced to the densification and reduced the thickness range with regard to ITZ.
Abstract To explore the evolution characteristics about the microstructure of unsaturated polyester resin modified concrete (UPMC) for bridge deck pavement under two regimes: the single-load action and the interaction of hygrothermal effect and fatigue load, the four-stage experimental programs were arranged. The micromorphological characteristics of micro-crack and pore structure and the micromechanical properties of interfacial transition zone (ITZ) corresponding to the cementitious composites were quantitatively characterized and evaluated through micro-structure analysis approaches and digitized image manipulation. The experimental results demonstrated that the addition of hygrothermal effect would profoundly aggravate the deterioration of crack and pore structure and expedite the ITZ expansion concerning bridge paving concretes under the action of fatigue load. Furthermore, with regard to the concrete microstructure under external action, the incorporation of unsaturated polyester resin (UPR) might restrain crack propagation and depress cracks irregularities, exert a refinement and homogenization effect on the porous structure and reduce the expansion thickness of ITZ.
Micro-structure characteristics of unsaturated polyester resin modified concrete under fatigue loads and hygrothermal environment
Zhang, Zhen (author) / Zhang, Hongliang (author) / Lv, Wenjiang (author) / Zhang, Jinming (author) / Wang, Ning (author)
2021-05-24
Article (Journal)
Electronic Resource
English
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