硅酸盐通报2026，Vol.45Issue(4)：1122-1131,10.DOI:10.16552/j.cnki.issn1001-1625.2025.0911
疏水改性煅烧硅藻土砂浆的制备及性能
Preparation and Performance of Hydrophobic-Modified Calcined Diatomite Mortar
摘要
Abstract
To enhance the waterproofing and impermeability of cement-based materials,this paper proposed a method for preparing green superhydrophobic powder.Using stearic acid as modifier,calcined diatomite(CD)underwent hydrophobic modification via mechanical ball milling.Process parameters were optimized with contact angle as the primary evaluation metric,successfully yielding modified calcined diatomite(SA-CD)with outstanding hydrophobic properties.The SA-CD was characterized using X-ray diffractometer(XRD),Fourier transform infrared spectrophotometer(FTIR),and scanning electron microscopy(SEM).The effects of substituting cement with SA-CD at different dosages on mortar properties were systematically investigated.Results indicate that under process conditions of 3％(mass fraction)stearic acid dosage,30 min ball milling time,and 500 r/min rotation speed,the prepared SA-CD shows a contact angle of 152°.As the SA-CD dosage increases,the mortar contact angle continuously rises while the capillary water absorption coefficient significantly decreases,simultaneously exhibiting a flow trend that initially increases before decreasing.At a 6％(mass fraction)SA-CD,the mortar's 28 d flexural strength and compressive strength improve by 8.81％and 10.44％,respectively.Microscopic analysis indicates that moderate SA-CD dosage improves pore structure and enhances density,thereby strengthening the mortar's overall performance.关键词
硬脂酸/煅烧硅藻土/接触角/毛细吸水/力学性能/微观结构Key words
stearic acid/calcined diatomite/contact angle/capillary water absorption/mechanical property/microstructure分类
建筑与水利引用本文复制引用
王海皓,甘元初,侯庆振,陈振富,金丹,付新博..疏水改性煅烧硅藻土砂浆的制备及性能[J].硅酸盐通报,2026,45(4):1122-1131,10.基金项目
国家自然科学基金面上项目(51678286) （51678286）
