Abstract The self-cleaning performance of photocatalytic cement paste is related to the dispersion of nano-TiO2 in the hardened matrix. This work aims to study the influences of Portland cement hydration on the self-cleaning behaviour of acidic anatase TiO2 hydrosol modified hardened Portland cement paste (HPCP), and the working mechanisms. The presence of TiO2 hydrosol results in the retardation of hydration at early age and better self-cleaning performance of HPCP. The additional surface defects of TiO2 in HPCP are the main reason of self-cleaning performance enhancement. The morphology and the pore size distribution of hydration products also contribute to the enhancement of self-cleaning performance by the surface electron capture effect, which are supported by the analyses of Confocal Raman Microscopy and Scanning Electron Microscope. A new mechanism is suggested to explain the role of photocatalytic property and cement hydration on the enhancement of self-cleaning performance of HPCP with different concentration of TiO2 hydrosol.

中文翻译：

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纳米分散二氧化钛水溶胶改性硅酸盐水泥浆：水化作用对自清洁机制的潜在作用

摘要 光催化水泥浆体的自洁性能与纳米TiO2在硬化基体中的分散性有关。【摘要】：目的研究硅酸盐水泥水化对酸性锐钛矿TiO2水溶胶改性硬化硅酸盐水泥浆(HPCP)自洁行为的影响及作用机理。TiO2 水溶胶的存在导致早期水化延迟和 HPCP 更好的自清洁性能。HPCP中TiO2的额外表面缺陷是自清洁性能增强的主要原因。水合产物的形态和孔径分布也有助于通过表面电子捕获效应增强自清洁性能，共聚焦拉曼显微镜和扫描电子显微镜的分析支持了这一点。