Abstract
Microcapsule-based self-healing concrete chronically suffers from rheology deterioration and hydration stagnation due to the hydrophilic and hygroscopic nature of microcapsules, limiting its efficacy and broader application. To address these issues, a novel hydrophobic nano-SiO2-modified epoxy resin (ER)@ethyl cellulose (EC) microcapsule was developed and characterized. Examinations revealed that both 5 % and 7 % SiO2-modified ER@EC microcapsules displayed favorable fundamental properties for cement-based materials, featuring high core contents (53.08 % and 48.04 %) and water contact angles over 90°. Compared to the unmodified capsules, the incorporation of 7 % SiO2-modified capsules prominently enhanced the rheology and hydration exotherm of fresh cement pastes, attributed to floc disassembly caused by electrostatic repulsion and increased water volume induced by replacement and ball-bearing effects. Moreover, incorporating a 4 % dosage of 5 % SiO2-modified capsules exhibited prominent healing efficiencies of 6.14 % for compressive strength and 35.11 % for chloride diffusion resistance. The hydrophobic nano-SiO2-modified ER@EC microcapsules actively improved rheology and hydration exotherm while preserving the ability to self-heal cracks in cement-based materials.
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