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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231663
Mechanical activation of halloysite as a sustainable precursor for cementitious materials
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This work presents a comprehensive investigation of the mechanical activation (MA) of halloysite (Hal) as a sustainable method to enhance its reactivity for the development of cementitious materials in construction applications. Hal, a 1:1 aluminosilicate clay with tubular morphology, is particularly valuable in regions where kaolinite (Kaol) is either scarce or entirely absent. High-energy planetary ball milling was applied to induce structural, morphological, and chemical modifications in a commercial Hal. The study systematically compares the effects of mechanical and thermal activation, employing a suite of advanced characterization techniques to monitor amorphization and microstructural changes. The most intensively milled sample (at 350 rpm for 120 min, H-350-120) reached 86% amorphous content, slightly higher than metahalloysite (MH, 84%). Reactivity was quantified using the modified Chapelle test, the R3 test, and alkaline solubility in 8 M NaOH. The H-350-120 sample achieved 1659 mg⋅g 1 of Ca(OH)2 fixation, 570 J⋅g 1 of cumulative heat release, and 10.98% bound water content, values closely comparable to those of MH. These findings enable the use of Hal-rich clays in regions with limited Kaol availability, and contributing to the development of supplementary or alternative cementitious materials.
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MARCO-GIBERT, Josep, et al. Mechanical activation of halloysite as a sustainable precursor for cementitious materials. Applied Clay Science. 2026. Vol. 290. ISSN 0169-1317. [consulted: 3 of October of 2026]. Available at: https://hdl.handle.net/2445/231663