Journal ArticleDOI
Hydration and properties of nano-TiO2 blended cement composites
TLDR
In this paper, two types of nano-TiO2 particles were blended into cement pastes and mortars and their effects on the hydration and properties of the hydrated Cement pastes were investigated.Abstract:
Two types of nano-TiO2 particles were blended into cement pastes and mortars. Their effects on the hydration and properties of the hydrated cement pastes were investigated. The addition of nano-TiO2 powders significantly accelerated the hydration rate and promoted the hydration degree of the cementitious materials at early ages. It was demonstrated that TiO2 was inert and stable during the cement hydration process. The total porosity of the cement pastes decreased and the pore size distribution were also altered. The acceleration of hydration rate and the change of microstructure also affected the physical and mechanical properties of the cement-based materials. The initial and final setting time was shortened and more water was required to maintain a standard consistence due to the addition of the nano-TiO2. The compressive strength of the mortar was enhanced, practically at early ages. It is concluded that the nano-TiO2 acted as a catalyst in the cement hydration reactions.read more
Citations
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Durability performances of concrete with nano-silica
Hongjian Du,Suhuan Du,Xuemei Liu +2 more
TL;DR: In this article, the durability properties of concrete containing nano-silica at dosages of 0.3% and 0.9% were investigated, and the pore size distribution indicated that the large capillary pores were refined by the nano silica, due to the combined contribution of the nano-filler effect and the pozzolanic reaction.
Journal Article
Durability performances of concrete with nano-silica
Hongjian Du,Suhuan Du,Xuemei Liu +2 more
TL;DR: In this article, the durability properties of concrete containing nano-silica at dosages of 0.3% and 0.9% were investigated, and the pore size distribution indicated that the large capillary pores were refined by the nano silica, due to the combined contribution of the nano-filler effect and the pozzolanic reaction.
Journal ArticleDOI
Influences of nano-TiO2 on the properties of cement-based materials: Hydration and drying shrinkage
TL;DR: In this paper, the influence of nano-TiO 2 on the properties of cement-based materials, the hydration process, the compressive strength development, and the drying shrinkage of concrete-like materials with nano-SiO 2 of 25-nm size was investigated.
Journal ArticleDOI
Enhancement of barrier properties of cement mortar with graphene nanoplatelet
Hongjian Du,Sze Dai Pang +1 more
TL;DR: In this article, the transport properties of cement mortar with graphene nanoplatelet (GNP) were investigated experimentally in the presence of a low cost carbon-based nano-sheet, which was added to mortar at contents of 0, 2.5, 5.0 and 7.5%.
Journal ArticleDOI
Photocatalytic systems as an advanced environmental remediation: Recent developments, limitations and new avenues for applications
Rizwan Ahmad,Rizwan Ahmad,Zaki Ahmad,Zaki Ahmad,Asad U. Khan,Naila Riaz Mastoi,Muhammad Aslam,Muhammad Aslam,Jeonghwan Kim +8 more
TL;DR: In this paper, fundamental and comprehensive assessments of the photocatalytic concepts and their applications for environmental remediation are reviewed, and the existing challenges and strategies to improve the photocATalytic efficiency are discussed.
References
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Journal ArticleDOI
TiO2 photocatalysis and related surface phenomena
TL;DR: The field of photocatalysis can be traced back more than 80 years to early observations of the chalking of titania-based paints and to studies of the darkening of metal oxides in contact with organic compounds in sunlight as discussed by the authors.
Book
Photocatalysis: Fundamentals and Applications
Ezio Pelizzetti,Nick Serpone +1 more
TL;DR: In this paper, the reader is first introduced to the meaning of photocatalysis and subsequently taken through the essentials of photochemistry towards bridging it to semiconductor materials, followed by thermodynamic and kinetic aspects.
Journal ArticleDOI
Influence of nano-SiO2 addition on properties of hardened cement paste as compared with silica fume
TL;DR: In this paper, the influence of nano-SiO 2 (NS) addition on properties of hardened cement paste (hcp) as compared with silica fume (SF) has been studied through measurement of compressive and bond strengths of hcp, and by XRD and SEM analysis.
Journal ArticleDOI
Characteristics of cement mortar with nano-SiO2 particles
TL;DR: In this paper, the properties of cement mortars with nano-SiO 2 were experimentally studied, and the results showed that the compressive strength of mortars containing nano SiO 2 particles was significantly higher than those of those containing silica fume at 7 and 28 days.
Journal ArticleDOI
Photogeneration of Highly Amphiphilic TiO2 Surfaces
Rong Wang,Kazuhito Hashimoto,Akira Fujishima,Makoto Chikuni,Eiichi Kojima,Atsushi Kitamura,Mitsuhide Shimohigoshi,Toshiya Watanabe +7 more
TL;DR: In this article, the authors reported the details of the photoconvertible surface wettability of TiO2 surfaces and showed that the formation of a microstructured composite between hydrophilic and oleophilic phases, which results from the photogenerated Ti defects at definite sites, is considered to explain the unique feature.