{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T08:31:50Z","timestamp":1787646710873,"version":"build-2736575974"},"reference-count":38,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T00:00:00Z","timestamp":1787616000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Anhui Construction Engineering Group Sanjian Co., Ltd."}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/ma19173606","type":"journal-article","created":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T08:00:48Z","timestamp":1787644848000},"page":"3606","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Static and Dynamic Mechanical Responses and Synergistic Mechanisms of Concrete Modified with Nano-CaCO3 and PP Fibers"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7229-2258","authenticated-orcid":false,"given":"Shengquan","family":"Zhou","sequence":"first","affiliation":[{"name":"School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiqiang","family":"Lin","sequence":"additional","affiliation":[{"name":"School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaming","family":"Li","sequence":"additional","affiliation":[{"name":"School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhaibang","family":"Ke","sequence":"additional","affiliation":[{"name":"Anhui Construction Engineering Group Sanjian Co., Ltd., Hefei 231131, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6949-1379","authenticated-orcid":false,"given":"Yongfei","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"104232","DOI":"10.1016\/j.ijimpeng.2022.104232","article-title":"Progressive fracturing of concrete under biaxial confinement and repetitive dynamic loadings: From damage to catastrophic failure","volume":"165","author":"Wang","year":"2022","journal-title":"Int. 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