Nanodispersed TiO2 hydrosol modified Portland cement paste: The underlying role of hydration on self-cleaning mechanisms

Nanodispersed TiO2 hydrosol modified Portland cement paste: The underlying role of hydration on self-cleaning mechanisms
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纳米分散二氧化钛水溶胶改性硅酸盐水泥浆体:水合作用对自清洁机制的潜在作用

DOI:
10.1016/j.cemconres.2020.106156
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发表时间:
2020-10
影响因子:
11.4
通讯作者:
Brouwers H. J. H.
Brouwers H. J. H.
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang Zixiao;Yu Qingliang;Gauvin Florent;Pan Feng;Ran Qianping;Brouwers H. J. H.

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光催化水泥浆体的自洁性能与纳米二氧化钛在硬化基质中的分散程度有关。研究了硅酸盐水泥水化对酸性锐钛矿型二氧化钛水溶胶改性硬化硅酸盐水泥浆体(HPCP)自洁性能的影响及其作用机理。二氧化钛水溶胶的存在延缓了HPCP的早期水化,改善了HPCP的自洁性能。HPCP中二氧化钛表面的附加缺陷是提高其自洁性能的主要原因。水化产物的形貌和孔径分布也有助于通过表面电子俘获效应提高自清洁性能,这在共聚焦拉曼显微镜和扫描电子显微镜的分析中得到支持。提出了一种新的机理,解释了光催化性能和水泥水化对不同浓度的二氧化钛水溶胶增强HPCP自洁性能的作用。
The self-cleaning performance of photocatalytic cement paste is related to the dispersion of nano-TiO2in the hardened matrix. This work aims to study the influences of Portland cement hydration on the self-cleaning behaviour of acidic anatase TiO2hydrosol modified hardened Portland cement paste (HPCP), and the working mechanisms. The presence of TiO2hydrosol results in the retardation of hydration at early age and better self-cleaning performance of HPCP. The additional surface defects of TiO2in 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 TiO2hydrosol.
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