纳米结构二氧化钛改性白水泥的自清洁及力学性能

Self-cleaning and mechanical properties of modified white cement with nanostructured TiO2.

作者信息

Khataee R, Heydari V, Moradkhannejhad L, Safarpour M, Joo S W

机构信息

Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 5166614766 Tabriz, Iran.

出版信息

J Nanosci Nanotechnol. 2013 Jul;13(7):5109-14. doi: 10.1166/jnn.2013.7586.

DOI:10.1166/jnn.2013.7586

PMID:23901537

Abstract

In the present study, self-cleaning and mechanical properties of white Portland cement by addition of commercial available TiO2 nanoparticles with the average particle size of 80 nm were investigated. X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET were used to characterize TiO2 nanoparticles. For determination of self-cleaning properties of TiO2-modified white cement, colorimetric tests in decolorization of C.I. Basic Red 46 (BR46) in comparison to unmodified cement samples was applied. The results indicated that with increasing the amount of TiO2 nanoparticles in modified cement, self-cleaning property of the samples increased. The mechanical properties of TiO2-modified and unmodified cement samples, such as time of setting of hydraulic cement, compressive strength of hydraulic cement mortar and flexural strength of hydraulic cement mortar were examined. The results indicated that addition of TiO2 nanoparticles up to maximum replacement level of 1.0% improved compressive and flexural strength and decreased its setting time.

摘要

在本研究中，研究了添加平均粒径为80 nm的市售二氧化钛纳米颗粒对白色波特兰水泥自清洁性能和力学性能的影响。采用X射线衍射（XRD）、透射电子显微镜（TEM）和BET对二氧化钛纳米颗粒进行表征。为了测定二氧化钛改性白水泥的自清洁性能，采用比色法测试了与未改性水泥样品相比，C.I.碱性红46（BR46）的脱色情况。结果表明，随着改性水泥中二氧化钛纳米颗粒含量的增加，样品的自清洁性能增强。对二氧化钛改性和未改性水泥样品的力学性能进行了研究，如水硬性水泥的凝结时间、水硬性水泥砂浆的抗压强度和水硬性水泥砂浆的抗折强度。结果表明，添加二氧化钛纳米颗粒至最大替代量1.0%时，抗压强度和抗折强度提高，凝结时间缩短。