长沙理工大学学报（自然科学版）2024，Vol.21Issue(4)：176-187,12.DOI:10.19951/j.cnki.1672-9331.20230305002
超疏水改性水泥基材料设计及性能研究
Study on design and performance of superhydrophobic modified cement-based materials
摘要
Abstract
[Purposes]This paper aims to study the effects of nano-silica(NS)and siloxane on the superhydrophobic modifications and properties of cement-based materials.[Methods]The best ratios of modified materials,including dodecyltrimethoxysilane(DTES),NS,and polycarboxylate superplasticizer(PCE)for cement-based materials,were selected by the orthogonal test method.The strength tests,the heat of hydration tests,the contact angle measurements,and the capillary water absorption tests were conducted to evaluate the effects of the modified materials on the mechanical and hydrophobic properties of the cement.[Findings]The best mass mixing ratios of DTES,NS,and PCE are 3.00％,1.80％,and 0.25％,respectively.The water contact angle on the surface of the modified cement specimen is up to 152.50°.The capillary water absorption coefficient is reduced by more than 91％,and the flexural strength after 3 d and the compressive strength after 28 d are reduced by 19％and 12％,respectively.[Conclusions]The combined effect of the modified materials results on the surface of cement-based materials is superhydrophobic and of excellent resistance to water penetrations.The strength of cement is affected by DTES,while the compressive strength and the later flexural strength are enhanced by NS.关键词
超疏水/纳米二氧化硅/水泥基材料/正交试验/力学性能Key words
super-hydrophobic/nano-silica/cement-based materials/orthogonal test/mechanical property分类
建筑与水利引用本文复制引用
周剑波,叶群山,郭厚青..超疏水改性水泥基材料设计及性能研究[J].长沙理工大学学报（自然科学版）,2024,21(4):176-187,12.基金项目
湖南省教育厅科学研究重点项目(20A012),长沙市科技计划项目(kq2014107),长沙理工大学研究生科研创新项目(CX2021SS10) Project(20A012)supported by Scientific Research of Hunan Education Department （20A012）
Project(kq2014107)supported by Science and Technology Plan Program of Changsha （kq2014107）
Project(CX2021SS10)supported by Postgraduate Research Innovation Program of Changsha University of Science & Technology （CX2021SS10）
