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The effect of alkali-treated bamboo fibers (1.0% and 1.5% by weight of cement; 2% NaOH) on the fresh-mix properties, mechanical performance, compressive deformability, and flexural fracture energy of high-strength concrete was evaluated. The addition of fibers increased the air content and reduced the consistency of the mix. The compressive strength changed by +\u20094% and \u2212\u20096%, while the strain corresponding to peak stress increased by 11% and 7%. The splitting tensile strength decreased by 14%, whereas the flexural tensile strength increased significantly by 12%. A more pronounced effect was observed for fracture energy, which increased significantly: G\n                    <jats:sub>f,\u03b4<\/jats:sub>\n                    by 20% and 143%, and G\n                    <jats:sub>f, CMOD<\/jats:sub>\n                    by 20% and 33%. The increase in fracture energy may be associated with delayed microcrack initiation in the notch-tip zone, limited microcrack coalescence, and short-term load retention near the peak value, as confirmed by the flexural response curves and by the analysis of the evolution of the principal tensile strain \u03b5\u2081 concentration zone. Scanning electron microscopy revealed only minor qualitative changes in fiber surface morphology after alkali treatment.\n                  <\/jats:p>","DOI":"10.1038\/s41598-026-48624-x","type":"journal-article","created":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T05:14:45Z","timestamp":1777958085000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Compressive deformability and flexural fracture energy of high-strength concrete with bamboo fibers"],"prefix":"10.1038","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8977-4154","authenticated-orcid":false,"given":"Maciej","family":"Ka\u017amierowski","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maciej","family":"Siemiginowski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4193-9244","authenticated-orcid":false,"given":"Micha\u0142","family":"Kordasz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Micha\u0142","family":"Drzazga","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,5,5]]},"reference":[{"key":"48624_CR1","doi-asserted-by":"publisher","first-page":"844","DOI":"10.1016\/j.jmrt.2023.03.038","volume":"24","author":"J Ahmad","year":"2023","unstructured":"Ahmad, J., Zhou, Z. & Deifalla, A. 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