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A platform for research: civil engineering, architecture and urbanism
Deterioration mechanism on Micro-structure of unsaturated polyester resin modified concrete for bridge deck pavement under salty Freeze-thaw cycles
Highlights The microstructure evolution of UPMC under freeze–thaw cycles (FT) in fresh or salty water was investigated. UPR-WEP effectively restrained propagation and irregularities concerning interior crack under FT in fresh or salty water. UPR exerted a refinement and homogenization effect on the internal pore structure under FT in fresh or salty water. UPR conduced to the densification and homogenization and reduced the thickness range regarding ITZ.
Abstract To investigate the dynamic evolution characteristics on the microstructural deterioration of unsaturated polyester resin modified concrete (UPMC) for bridge deck paving layer in the salt freeze–thaw environment, the four-stage experimental layout under two freeze–thaw (FT) cycles regimes (i.e., FT-fresh water and FT-salty water) were schemed. The dynamic deterioration rule and mechanism of the interior pore structure, microcrack and interfacial transition zone (ITZ) under different FT stages were analyzed through quantitatively characterizing the corresponding characteristics parameters utilizing mercury intrusion approach (MIP), SEM, digital image processing and energy dispersive spectrum (EDS) test. The test results demonstrated that FT cycles would exacerbate the damnification degree of the interior pores and microcracks and the ITZ expansion inside concrete, especially under FT-salt water, due to crystallization pressure and expansion stress and a pumping effect from FT cycles, as well as chloride-induced corrosion. Nevertheless, the introduction of unsaturated polyester resin (UPR) could restrain the germination, propagation and nucleation of interior microdefects, diminish the morphologic irregularities of crack structure, exert a replenishing and refinement effect on the internal micropores and retard the expansion in ITZ width range irrespective of FT types.
Deterioration mechanism on Micro-structure of unsaturated polyester resin modified concrete for bridge deck pavement under salty Freeze-thaw cycles
Highlights The microstructure evolution of UPMC under freeze–thaw cycles (FT) in fresh or salty water was investigated. UPR-WEP effectively restrained propagation and irregularities concerning interior crack under FT in fresh or salty water. UPR exerted a refinement and homogenization effect on the internal pore structure under FT in fresh or salty water. UPR conduced to the densification and homogenization and reduced the thickness range regarding ITZ.
Abstract To investigate the dynamic evolution characteristics on the microstructural deterioration of unsaturated polyester resin modified concrete (UPMC) for bridge deck paving layer in the salt freeze–thaw environment, the four-stage experimental layout under two freeze–thaw (FT) cycles regimes (i.e., FT-fresh water and FT-salty water) were schemed. The dynamic deterioration rule and mechanism of the interior pore structure, microcrack and interfacial transition zone (ITZ) under different FT stages were analyzed through quantitatively characterizing the corresponding characteristics parameters utilizing mercury intrusion approach (MIP), SEM, digital image processing and energy dispersive spectrum (EDS) test. The test results demonstrated that FT cycles would exacerbate the damnification degree of the interior pores and microcracks and the ITZ expansion inside concrete, especially under FT-salt water, due to crystallization pressure and expansion stress and a pumping effect from FT cycles, as well as chloride-induced corrosion. Nevertheless, the introduction of unsaturated polyester resin (UPR) could restrain the germination, propagation and nucleation of interior microdefects, diminish the morphologic irregularities of crack structure, exert a replenishing and refinement effect on the internal micropores and retard the expansion in ITZ width range irrespective of FT types.
Deterioration mechanism on Micro-structure of unsaturated polyester resin modified concrete for bridge deck pavement under salty Freeze-thaw cycles
Zhang, Zhen (author) / Zhang, Hongliang (author) / Zhu, Kongfa (author) / Tang, Zujie (author) / Zhang, Hao (author)
2023-01-09
Article (Journal)
Electronic Resource
English
Time-dependent deterioration of FRP bridge deck under freeze/thaw conditions
| British Library Online Contents | 2011
| Taylor & Francis Verlag | 2014