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Tailoring compatibility and mechanical properties of cold-mixed epoxy asphalt via external epoxy group content manipulation
Abstract The compatibility of cold-mixed epoxy asphalt (CEA) significantly influences its mechanical properties, primarily mediated by the epoxy group content within CEA. However, the feasibility and mechanisms for regulating the external epoxy group content to achieve optimal performance have yet to be explored thoroughly. Herein, soybean oil, epoxidized soybean oil, and epoxy-terminated hyperbranched epoxy resin (EHER) were used to construct CEA with different external epoxy group contents, and their effects and mechanisms on the compatibility and mechanical properties of CEA were investigated based on experiments and molecular dynamics simulation. Our findings suggest that maintaining an external epoxy group content between 8.4%∼11.4% in the CEA blend and below 12.17% in the cured CEA is crucial. These criteria can be met by adding no more than 5 wt% EHER. CEA with 3 wt% EHER exhibited the most balanced compatibility and mechanical properties, characterized by a pot life of 91 min, a tensile strength of 5.02 MPa, an elongation at break of 61.3%, and a tensile toughness of 1.58 MJ/m3. The presence of external epoxy groups increased the cohesive energy density and the solubility parameter difference between epoxy resin and asphalt prior to curing, forming a "sea-island" structure with varying particle sizes, primarily comprising small-sized particles. This structure was preserved post-curing, establishing a stable system with minor energy alterations. Simultaneously, EHER enhanced the molecular rigidity and uniformity of CEA, thereby improving its mechanical properties. It is recommended to relate epoxy group content in CEA blends with indicators of compatibility and mechanical properties, enabling better prediction.
Highlights Desirable performance is exhibited by CEA with no more than 5 wt% EHER. ER provides strength and asphalt acts as a toughener in CEA. The "sea-island" structure is preserved post-curing with minor energy variations. Epoxy group content in blends has a high grey correlation with performance.
Tailoring compatibility and mechanical properties of cold-mixed epoxy asphalt via external epoxy group content manipulation
Abstract The compatibility of cold-mixed epoxy asphalt (CEA) significantly influences its mechanical properties, primarily mediated by the epoxy group content within CEA. However, the feasibility and mechanisms for regulating the external epoxy group content to achieve optimal performance have yet to be explored thoroughly. Herein, soybean oil, epoxidized soybean oil, and epoxy-terminated hyperbranched epoxy resin (EHER) were used to construct CEA with different external epoxy group contents, and their effects and mechanisms on the compatibility and mechanical properties of CEA were investigated based on experiments and molecular dynamics simulation. Our findings suggest that maintaining an external epoxy group content between 8.4%∼11.4% in the CEA blend and below 12.17% in the cured CEA is crucial. These criteria can be met by adding no more than 5 wt% EHER. CEA with 3 wt% EHER exhibited the most balanced compatibility and mechanical properties, characterized by a pot life of 91 min, a tensile strength of 5.02 MPa, an elongation at break of 61.3%, and a tensile toughness of 1.58 MJ/m3. The presence of external epoxy groups increased the cohesive energy density and the solubility parameter difference between epoxy resin and asphalt prior to curing, forming a "sea-island" structure with varying particle sizes, primarily comprising small-sized particles. This structure was preserved post-curing, establishing a stable system with minor energy alterations. Simultaneously, EHER enhanced the molecular rigidity and uniformity of CEA, thereby improving its mechanical properties. It is recommended to relate epoxy group content in CEA blends with indicators of compatibility and mechanical properties, enabling better prediction.
Highlights Desirable performance is exhibited by CEA with no more than 5 wt% EHER. ER provides strength and asphalt acts as a toughener in CEA. The "sea-island" structure is preserved post-curing with minor energy variations. Epoxy group content in blends has a high grey correlation with performance.
Tailoring compatibility and mechanical properties of cold-mixed epoxy asphalt via external epoxy group content manipulation
Wang, Junyan (author) / Yu, Xin (author) / Si, Jingjing (author) / Shao, Xiaoyang (author) / Zhao, Shuang (author) / Ding, Gongying (author)
2024-01-05
Article (Journal)
Electronic Resource
English
ATR , Attenuated total reflection , CEA , Cold-mixed epoxy asphalt , CED , Cohesive energy density , COMPASS II , Condensed-Phase Optimized Molecular Potentials for Atomistic Simulation Studies II , <italic>D</italic> , Average diameter , DGEBA , Diglycidyl ether of bisphenol A , DMA , Dynamic mechanical analysis , EA , Epoxy asphalt , EHER , Epoxy-terminated hyperbranched epoxy resin , EHER3-CEA , CEA with 3 wt% EHER , EHER5-CEA , CEA with 5 wt% EHER , EHER-CEA , A concise expression for EHER3-CEA and EHER5-CEA. , ER , Epoxy resin , ESO , Epoxidized soybean oil , ESO-CEA , CEA prepared using only ESO as a compatibilizer , FM , Fluorescence microscopy , FTIR , Fourier transform infrared spectroscopy , GRA , Grey relational analysis , HBP , Hyperbranched polyester , HEA , Hot-mixed epoxy asphalt , KH560 , <italic>γ</italic>-(2,3-epoxypropoxy) propyl trimethoxysilane , MD , Molecular dynamics , MSD , Mean square displacement , NMR , Nuclear magnetic resonance , NPT ensemble , Isothermal-isobaric ensemble , NVT ensemble , Canonical ensemble , PDI , Polydispersity index , PMA , Polymer modified asphalt , RD , Reaction degree , RDF , Radial distribution function , <italic>R</italic> <inf>g</inf> , Radius of gyration , SBS , Styrene-butadiene-styrene , SEM , Scanning electron microscopy , SO , Soybean oil , SO-CEA , CEA prepared using only SO as a compatibilizer , <italic>T</italic> <inf>g</inf> , Glass transition temperature , tan <italic>δ</italic> <inf>max</inf> , Peak value of the loss tangent , XPS , X-ray photoelectron spectroscopy , <italic>δ</italic> , Solubility parameters , Δ<italic>δ</italic> , Difference in solubility parameters , Compatibility , External epoxy group , Mechanical properties , Molecular dynamics simulations
Influence of epoxy soybean oil modified nano-silica on the compatibility of cold-mixed epoxy asphalt
| Springer Verlag | 2021
Influence of epoxy soybean oil modified nano-silica on the compatibility of cold-mixed epoxy asphalt
| Online Contents | 2021