硅酸盐通报2026，Vol.45Issue(6)：1876-1891,16.DOI:10.16552/j.cnki.issn1001-1625.2025.1154
冻融循环对硅烷改性ECC力学与吸水性能的影响
Influence of Freeze-Thaw Cycles on Mechanical and Water Absorption Properties of Silane-Modified ECC
摘要
Abstract
This study comprehensively investigated the influence patterns and mechanisms of internally incorporated silane types on the mechanical properties and water absorption properties of engineered cementitious composites(ECC)using multiple material testing techniques.It analyzed the evolution patterns and microscopic mechanisms of mechanical and water absorption properties for both unmodified ECC and isooctyl triethoxy silane IOTS modified ECC after freeze-thaw cycles.The results show that:except for γ-methacryloxy propyl trimethoxy silane(KH570),neither IOTS nor N-(β-aminoethyl)-γ-aminopropyl trimethoxy silane(KH792)causes a significant negative impact on the mechanical properties of ECC.Both KH570 and KH792 markedly delay the hydration heat release of the cementitious materials.The IOTS modified ECC exhibited the best hydrophobicity,maintaining its hydrophobic characteristics even after severe freeze-thaw damage.After freeze-thaw cycles,the compressive strength deterioration rate of IOTS-modified specimens is higher than that of unmodified specimens,but their flexural strength remains higher.As the number of freeze-thaw cycles increases,the relationship between the water absorption mass per unit area and the square root of time shifts from linear to bilinear for both types of specimens,and the duration of the initial linear stage shortens as the number of freeze-thaw cycles increases.The research findings provide a theoretical basis for the hydrophobic design of ECC and its application and durability evaluation in freeze-thaw environments.关键词
工程水泥基复合材料/硅烷改性/冻融循环/力学性能/吸水性能/低场核磁共振Key words
engineered cementitious composite/silane modification/freeze-thaw cycle/mechanical property/water absorption property/low-field nuclear magnetic resonance分类
建筑与水利引用本文复制引用
刘亚君,薛善彬,郑子昊,史志浩,王文焕..冻融循环对硅烷改性ECC力学与吸水性能的影响[J].硅酸盐通报,2026,45(6):1876-1891,16.基金项目
国家自然科学基金(U2106220,U24A20162,52008222) （U2106220,U24A20162,52008222）
青岛市科技惠民示范专项(24-1-8-cspz-9-nsh) （24-1-8-cspz-9-nsh）
