Luo Jie, Xu Yi, Chu Hongqiang, Yang Lu, Song Zijian, Jin Weizhun, Wang Xiaowen, Xue Yuan
College of Mechanics and Materials, Hohai University, Nanjing 211100, China.
Materials (Basel). 2023 Oct 7;16(19):6592. doi: 10.3390/ma16196592.
The utilization of a novel monolithic superhydrophobic cement material effectively prevents water infiltration and enhances the longevity of the material. A method for improving superhydrophobic concrete was investigated with the aim of increasing its strength and reducing its cost by compounding superhydrophobic substances with water repellents. The experimental tests encompassed the assessment of the compressive strength, contact angle, and water absorption of the superhydrophobic cementitious materials. The findings demonstrate that an increase in the dosage of isobutyltriethoxysilane (IBTES) progressively enhances the contact angle of the specimen, but significantly diminishes its compressive strength. The contact angle of SIKS mirrors that of SIS3, with a superior compressive strength that is 68% higher. Moreover, superhydrophobicity directly influences the water absorption of cementitious materials, with a more pronounced superhydrophobic effect leading to a lower water absorption rate. The water absorption of cementitious materials is influenced by the combined effect of porosity and superhydrophobicity. Furthermore, FT-IR tests unveil functional mappings, such as -CH which can reduce the surface energy of materials, signifying successful modification with hydrophobic substances.
一种新型整体超疏水水泥材料的应用有效防止了水的渗透并提高了材料的使用寿命。研究了一种改进超疏水混凝土的方法，旨在通过将超疏水物质与防水剂复合来提高其强度并降低成本。实验测试包括对超疏水胶凝材料的抗压强度、接触角和吸水率的评估。研究结果表明，异丁基三乙氧基硅烷（IBTES）用量的增加会逐渐提高试样的接触角，但会显著降低其抗压强度。SIKS的接触角与SIS3的接触角相似，但其抗压强度更高，高出68%。此外，超疏水性直接影响胶凝材料的吸水率，超疏水效果越显著，吸水率越低。胶凝材料的吸水率受孔隙率和超疏水性的综合影响。此外，傅里叶变换红外光谱（FT-IR）测试揭示了诸如-CH等官能团，其可以降低材料的表面能，表明用疏水性物质改性成功。
