TY - JOUR
T1 - Nano dispersed TiO2 hydrosol modified Portland cement paste: the underlying role of hydration on self-cleaning mechanisms
AU - Wang, Zixiao
AU - Yu, Q.L. (Qingliang)
AU - Gauvin, Florent
AU - Feng, Pan
AU - Ran, Qianping
AU - Brouwers, H.J.H. (Jos)
PY - 2020/10
Y1 - 2020/10
N2 - 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 behavior 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.
AB - 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 behavior 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.
KW - Hydration
KW - Nanodispersed TiO hydrosol
KW - Optical parameters
KW - Portland cement
KW - Self-cleaning performance
UR - http://www.scopus.com/inward/record.url?scp=85086590535&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2020.106156
DO - 10.1016/j.cemconres.2020.106156
M3 - Article
VL - 136
JO - Cement and Concrete Research
JF - Cement and Concrete Research
SN - 0008-8846
M1 - 106156
ER -