硅酸盐通报2026，Vol.45Issue(6)：1903-1913,11.DOI:10.16552/j.cnki.issn1001-1625.2025.1160
TEOS-IBT协同改性水泥净浆的疏水性能及机理研究
Hydrophobic Properties and Mechanism of TEOS-IBT Synergistically Modified Cement Paste
摘要
Abstract
To improve the hydrophobic properties of cement-based materials,isobutyl triethoxysilane(IBT)and tetraethyl orthosilicate(TEOS)were used to singly and jointly modify P·I 52.5 Portland cement paste(water-cement ratio of 0.35).The content of IBT or TEOS was set to 1%～6%(mass fraction),and 1%～3%TEOS was compounded on the basis of fixing the IBT content at 3%(mass fraction).The cement paste was characterized by tests of fluidity,setting time,compressive strength,contact angle,capillary water absorption coefficient(S),heat of hydration,combined with characterization techniques such as SEM、FTIR and XRD.The results show that the co-admixture markedly amplifies surface hydrophobicity,the compound addition of IBT-3%+TEOS-3% increases the contact angle up to 140.0°,compared with the single addition of 3%IBT,the contact angle is increased by 58.37%.In terms of moisture transport performance,IBT-4%reduces capillary water absorption coefficient(S)from the control value of 0.004 19 mm·s-1/2 to 0.000 99 mm·s-1/2;When TEOS of 1%～3%is compounded on the basis of fixing the IBT content at 3%,S is 0.002 93～0.003 63 mm·s-1/2,higher than IBT-3%alone group but still 13%～30%lower than the control.Based on the above results,this study reveals the synergistic mechanism of TEOS and internally mixed IBT in modified cement paste,and provides an operable basis for the design of hydrophobic cement-based materials.关键词
水泥基材料/异丁基三乙氧基硅烷/正硅酸四乙酯/疏水性/改性Key words
cement-based material/isobutyl triethoxysilane/tetraethyl orthosilicate/hydrophobicity/modification分类
建筑与水利引用本文复制引用
成子高,丛贇,张琰,李根,郅天一,谭洪波..TEOS-IBT协同改性水泥净浆的疏水性能及机理研究[J].硅酸盐通报,2026,45(6):1903-1913,11.基金项目
国网浙江省电力有限公司科技项目(5211ZS250005) （5211ZS250005）
