Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/29557
Title: Portland cement paste modified by TiO2 nanoparticles : a microstructure perspective
Authors: Feng, D
Xie, N
Gong, C
Leng, Z 
Xiao, H
Li, H
Shi, X
Issue Date: 2013
Publisher: American Chemical Society
Source: Industrial and engineering chemistry research, 2013, v. 52, no. 33, p. 11575-11582 How to cite?
Journal: Industrial and engineering chemistry research 
Abstract: Nanomodified Portland cement paste with a water/cement ratio of 0.4 was prepared with the addition of TiO2 nanoparticles at 0.1, 0.5, 1.0, and 1.5% by mass of cement. The flexural strengths of the prepared cement-based composites were tested, and the fracture surfaces were observed by scanning electron microscopy (SEM). The flexural strength of the nanomodified TiO 2 Portland cement paste reached the highest value with a dosage of 1.0 mass %. The SEM observation shows that admixing of the TiO2 nanoparticles largely decreased the quantity of internal microcracks in the cement paste. A new type of needle-shaped hydration product was observed, and its potential growth mechanism was proposed. Atomic force microscopy was introduced to observe the microstructure of nanomodified Portland cement paste, and the results show that the nanoroughness of the hardened cement pastes with admixed TiO2 nanoparticles was much lower than that without the TiO2 nanoparticle addition. Coupled with X-ray diffraction data, the morphological information obtained at the micrometer and nanometer scales shed light on the role of TiO2 nanoparticles in the cement-based composite.
URI: http://hdl.handle.net/10397/29557
ISSN: 0888-5885
EISSN: 1520-5045
DOI: 10.1021/ie4011595
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