Effects of the pozzolanic reactivity of nanoSiO 2 on cement-based materials

Hou, Pengkun; Qian, Jueshi; Cheng, Xin; Shah, Surendra P.

doi:10.1016/j.cemconcomp.2014.09.014

Cited by 177 publications

(59 citation statements)

References 27 publications

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“…However, these organic treatment agents have relatively low weather resistivity and deteriorate and lose their functionality within a couple of years. [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 98%

Effect of SiO2 oligomers on water absorption of cementitious materials

Wang

Yang

Hou

et al. 2016

Cement and Concrete Research

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“…However, these organic treatment agents have relatively low weather resistivity and deteriorate and lose their functionality within a couple of years. [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 98%

Effect of SiO2 oligomers on water absorption of cementitious materials

Wang

Yang

Hou

et al. 2016

Cement and Concrete Research

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“…The pozzolanic activity of SiO 2 coupled with nano-lling effect is in favor of the mechanical enhancement of cement composites. 16,17 The effects of SiO 2 NPs/PC@GO hybrid on the compressive strength of cement composites have been explored with GO concentration xed at 0.02 wt% and various SiO 2 NPs dosages.…”

Section: -8mentioning

confidence: 99%

Synergistic effects of silica nanoparticles/polycarboxylate superplasticizer modified graphene oxide on mechanical behavior and hydration process of cement composites

et al. 2017

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In this paper, the graphene oxide (GO) modified by polycarboxylate superplasticizer (PC) (PC@GO) was decorated by silica nanoparticles (SiO 2 NPs) to form a hybrid structure of SiO 2 NPs/PC@GO. The asprepared SiO 2 NPs/PC@GO hybrid was incorporated in cement matrix for further reinforcement. The results show that SiO 2 NPs are uniformly distributed on the surface of GO nanosheets. The addition of SiO 2 NPs/PC@GO hybrid (1.5% SiO 2 and 0.02% GO by weight of cement) can increase the compressive strength by factors of 38.31%, 44.47% and 38.89% at 3, 7, 28 days, respectively, which are much higher than those of cement composites reinforced by a single-promoter (either PC@GO or SiO 2 NPs).Moreover, our results demonstrate that SiO 2 NPs/PC@GO hybrid can accelerate the cement hydration, improve the degree of pozzolanic reaction and refine the microstructure of hydration products. The excellent reinforcement is attributed to the synergistic effects of SiO 2 NPs/PC@GO hybrid including better dispersion property, higher degree of pozzolanic reaction and cross-linking structure of [SiO 2 -GO-CSH]. This work provides a very effective way to reinforce cement composites by SiO 2 NPs/PC@GO hybrid.

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“…Nucleation only occurs in the C-S-H gel and only nanoparticle can perform the densifying effect in the C-S-H system. With the occurrence of nanoparticles, microstructure of C-S-H gel is improved due to the densifying process in the void between C-S-H matrix components [17,18]. Although highest strength is performed by NMCA1, other nano metaclay UHPC mix also recorded higher compressive strength better than those OPC and metakaolin UHPC mix.…”

Section: Characteristics Of Nanoclay and Nano Metaclaymentioning

confidence: 80%

Characteristic and Strength Properties of Nano Metaclayed UHPC

Sidek¹,

Hamidah²,

Fadzil³

et al. 2016

InCIEC 2015

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Nanometal clay formerly known as nanoclay was a product from kaolin. Nanoclay considered as layered silicate mineral and potentially can be used as supplementary material in concrete study due to kaolinite compound in its chemical composition which is similar to metakaolin. In this study, formulation of nano metaclay where used as additives from 0, 1, 3, 5, 7, and 9 % in ultra-high performance concrete mix. This paper aims to study the effect of nano metaclay in morphology which includes XRF, SEM, and XRD analysis, characteristics of nano metaclay UHPC mix in workability, and also to see the hardened properties by means of compressive strength behavior and micrograph image of UHPC. All nano metaclayed UHPC mix will be compared to normal UHPC mix. As a conclusion, nano metaclay ball-forming structure provides a new knowledge on nano materials in concrete. Due to its clay properties, water demand is higher and decrease in fresh state occurred. Finally, addition of nano metaclay UHPC improves compressive strength of UHPC mix by acting as nano filler and promoting nucleation process in cement grain.

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Effects of the pozzolanic reactivity of nanoSiO 2 on cement-based materials

Cited by 177 publications

References 27 publications

Effect of SiO2 oligomers on water absorption of cementitious materials

Effect of SiO2 oligomers on water absorption of cementitious materials

Synergistic effects of silica nanoparticles/polycarboxylate superplasticizer modified graphene oxide on mechanical behavior and hydration process of cement composites

Characteristic and Strength Properties of Nano Metaclayed UHPC

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