Improvements of nano-SiO2 on sludge/fly ash mortar

Lin, Deng-Fong; Lin, Kae‐Long; Chang, Wei-Che; Luo, Huan-Lin; Cai, Ming-Du

doi:10.1016/j.wasman.2007.03.023

Cited by 186 publications

(66 citation statements)

References 3 publications

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“…Indeed, nanoparticles can impart novel properties self-sensing, pollution abatement, and self-cleaning ability as well as modifying cement hydration behaviour. In this regard, the use of nanosilica particles have given place to an important increase in the compression strength of cement pastes [11], improvement of photocatalytical [12][13][14] and self-cleaning properties [15], at the same time that other types of nanoparticles (nanotubes, nanofibers, or nanoclay) are also responsible for a higher hydration degree of cementitious compounds as long as higher nanoparticle dispersion can be achieved [16].…”

Section: Introductionmentioning

confidence: 99%

TiO2 and TiO2–SiO2 coated cement: Comparison of mechanic and photocatalytic properties

Mendoza

Valle

Castellote

et al. 2015

Applied Catalysis B: Environmental

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a b s t r a c tAn increasingly known application of nanomaterials in the construction industry is related to the photoactivity ability of semiconductors, where nano-anatase TiO 2 is perhaps the most well-known photocatalytic semiconductor and one which possesses a strong oxidizing capability. To analyze the photo-efficiency of four TiO 2 coatings and the effect of SiO 2 interlayer on the mechanic and photocatalytic activity in Rhodamine B (RhB) and NO x photodegradation, two photocatalytic cement series have been prepared. First, cement mortar was coated with three commercial TiO 2 suspensions (GG1, GC7 and CG13) and a home-made titania sol-gel (TEA), and secondly an insertion of a SiO 2 layer was applied on cement surface before spraying the TiO 2 layer.All studied TiO 2 -cements exhibited a significant RhB and NO x photodegradation, arising almost total RhB molar conversions, and upper 53% for NO x photo-oxidation respectively. Nevertheless, although SiO 2 layer deposited in between mortar and TiO 2 -cement did not stabilize the commercial TiO 2 coatings, a good adhesion was observed when silica was applied joint to the home-made titania gel (TEA), probably as a consequence of the interactions encountered between SiO 2 and TiO 2 gels. CG7-Si-Cem exhibited high rate at shorter irradiation times, but TEA-Cem and TEA-Si-Cem can be considered as very interesting and potential photocatalytic mortars due to useful mechanical properties, with a very good coatings adhesion that provides promising outdoor use, and good photo-efficiencies in RhB and NO x photo-oxidation.

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Section: Introductionmentioning

confidence: 99%

TiO2 and TiO2–SiO2 coated cement: Comparison of mechanic and photocatalytic properties

Mendoza

Valle

Castellote

et al. 2015

Applied Catalysis B: Environmental

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“…Only, there are several reports on incorporation of nanoparticles in NVCs which most of them have focused on using SiO 2 nanoparticles [10][11][12][13][14][15][16][17][18][19] and TiO 2 nanoparticles 20,21 .…”

Section: Introductionmentioning

confidence: 99%

The effects of ZrO2 nanoparticles on physical and mechanical properties of high strength self compacting concrete

Nazari

Riahi

2010

Mat. Res.

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In this work, strength assessments and coefficient of water absorption of high performance self compacting concrete containing different amounts of ZrO 2 nanoparticles have been investigated. The results indicate that the strength and the resistance to water permeability of the specimens are improved by adding ZrO 2 nanoparticles in the cement paste up to 4.0 wt. (%). ZrO 2 nanoparticles, as a result of increased crystalline Ca(OH) 2 amount especially at the early age of hydration, could accelerate C-S-H gel formation and hence increase the strength of the concrete specimens. In addition, ZrO 2 nanoparticles are able to act as nanofillers and recover the pore structure of the specimens by decreasing harmful pores. Several empirical relationships have been presented to predict flexural and split tensile strength of the specimens by means of the corresponding compressive strength at a certain age of curing. Accelerated peak appearance in conduction calorimetry tests, more weight loss in thermogravimetric analysis and more rapid appearance of the peaks related to hydrated products in X-ray diffraction results, all indicate that ZrO 2 nanoparticles could improve mechanical and physical properties of the concrete specimens.

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“…Furthermore, the simultaneous use of nSO and ash presents a higher performance in the properties of mortars at early ages, resistance to corrosion and as a consequence an increased durability [14,15,16,17,18,19]. However, researches that combine the use of nSO and ash are scarce [12,13,14], in particular scientific papers related to reinforced mortars with replacements of OPC by nSO and RHA which address the issue of durability and corrosion of reinforcement [20].…”

Section: Introductionmentioning

confidence: 99%

Chloride Penetration in mortars with replacements of rice husk Ash and nano-SiO2

Almeraya‐Calderón¹,

Fajardo-San-Miguel²,

Martínez‐Villafañe³

2013

IOSRJEN

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-Ashes and nanoparticles (NP) have been incorporated individually in mortars to improve its macrostructure and microstructure. However, regarding the simultaneous use of ashes and NP there are few reports addressing the study of resistance to corrosion. It was evaluated in this work the mechanical, physical and electrochemical performance in mortars with plastic consistency according to ASTM C 1437-99, replacement of ordinary Portland cement (OPC) by rice husk ash (RHA) and nano Silica Oxide (nSO), conducting studies of mechanical resistance to simple compression, porosity, superficial absorption, rapid chloride penetration test (RCPT) and accelerated corrosion in mortars with replacements of OPC of 1.0% of nSO and 20.0% of RHA. According to results, the simultaneous use of nSO + RHA has a higher performance in the properties of mortars with decreases in porosity and total charge passed of 3.9% and 75.6%, and increase in compressive strength, and corrosion of 7.1% and 37.6 %, respectively. Mortars of plastic consistency with replacement of OPC by RHA and nSO in simultaneous use count with higher performance in their physical, mechanical and electrochemical properties than in individual use of RHA and nSO.

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Improvements of nano-SiO2 on sludge/fly ash mortar

Cited by 186 publications

References 3 publications

TiO2 and TiO2–SiO2 coated cement: Comparison of mechanic and photocatalytic properties

TiO2 and TiO2–SiO2 coated cement: Comparison of mechanic and photocatalytic properties

The effects of ZrO2 nanoparticles on physical and mechanical properties of high strength self compacting concrete

Chloride Penetration in mortars with replacements of rice husk Ash and nano-SiO2

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