Cement-based materials are strong yet brittle, organic modifications enhance their flexibility and durability, reducing cracks. The study investigates cementitious composites inspired by the “inorganic brick-and-organic mud” structure of nacre, focusing on organic modifications with Polyvinyl Alcohol (PVA) to enhance binding capacity and mechanical properties. Calculated Free energy and separation force indicate that lower organic concentrations effectively envelop inorganic surfaces, preventing organic aggregation. These organic-inorganic interactions vary with organic concentration and aqueous conditions, demonstrating notable kinetic peaks. Particularly in aqueous settings, PVA efficiently binds two otherwise separate calcium silicate hydrate (CSH) sheets, showcasing its effectiveness as a binder. The study identified a 5 % concentration of organics as optimal for effectively binding CSH sheets. The level not only enhances the mechanical properties of the composites but also significantly improves the CSH binding capacity. The free energy, separation force and mechanical properties provide vital insights into the development of advanced bio-inspired cementitious composites.

中文翻译：

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水性条件下使用类胶剂连接的多个 CSH 片材的形态稳定性


水泥基材料坚固但易碎，有机改性增强了其灵活性和耐用性，减少了裂缝。该研究研究了受珍珠质“无机砖和有机泥”结构启发的水泥基复合材料，重点是使用聚乙烯醇（PVA）进行有机改性，以增强粘合能力和机械性能。计算出的自由能和分离力表明，较低的有机物浓度可有效包封无机表面，防止有机物聚集。这些有机-无机相互作用随着有机浓度和水条件的变化而变化，表现出显着的动力学峰。特别是在水性环境中，PVA 可以有效地粘合两个原本分离的水合硅酸钙 (CSH) 片材，显示出其作为粘合剂的有效性。该研究确定 5% 的有机物浓度是有效结合 CSH 片的最佳浓度。该水平不仅增强了复合材料的机械性能，而且显着提高了CSH结合能力。自由能、分离力和机械性能为先进仿生水泥复合材料的开发提供了重要的见解。