Static and Dynamic Mechanical Responses and Synergistic Mechanisms of Concrete Modified with Nano-CaCO3 and PP Fibers
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Le résumé fourni par la source
To investigate the synergistic effects and underlying mechanisms of nano-CaCO3 (NCC) and polypropylene fibers (PPF) on the static and dynamic mechanical properties of concrete, this study systematically examines hybrid-modified concrete with varying additive contents. Compressive strength, splitting tensile strength, and split Hopkinson pressure bar (SHPB) tests were conducted to evaluate the mechanical responses under quasi-static and high-strain-rate impact loadings. Additionally, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) were employed to elucidate the multi-scale synergistic enhancement mechanisms. The results indicate that hybrid modification significantly improves both static and dynamic performance. Specifically, the optimal hybrid proportion was identified as 1.5% NCC and 1.5 kg/m3 PPF. Under static conditions, this combined addition effectively increases compressive strength by 51.56% and enhances splitting tensile strength while also substantially improving material toughness. Under dynamic impact conditions, dynamic compressive strength is notably elevated by 62.47%, demonstrating a pronounced strain-rate strengthening effect. Microstructural analyses confirm the presence of a nano-densification and macro-crack bridging mechanism, wherein NCC chemically accelerates hydration and optimizes the cementitious matrix, thereby strengthening the fiber-matrix interfacial transition zone (ITZ). This robust ITZ maximizes the physical crack-bridging and energy dissipation capacities of the PPF network. Ultimately, this study provides critical experimental evidence and theoretical guidance for designing high-performance, impact-resistant concrete composites.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Static and Dynamic Mechanical Responses and Synergistic Mechanisms of Concrete Modified with Nano-CaCO3 and PP Fibers
- Date Crossref
- 25/08/2026
- Éditeur
- MDPI AG
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Anhui University of Science and Technology pays non établi dans la noticeUniversité ou école supérieure
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Anhui Sanlian University pays non établi dans la noticeUniversité ou école supérieure
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Xiamen Institute of Building Research Group pays non établi dans la noticeStructure de recherche
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Kunming University of Science and Technology pays non établi dans la noticeUniversité ou école supérieure
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School of Civil Engineering and Architecture pays non établi dans la noticeUniversité ou école supérieure
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Ltd. Anhui Construction Engineering Group Sanjian Co. pays non établi dans la noticeEntreprise
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Faculty of Civil Engineering and Mechanics Department of Civil Engineering pays non établi dans la noticeUniversité ou école supérieure
Anhui University of Science and Technology, Anhui Sanlian University et Xiamen Institute of Building Research Group, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.