Effects of colloidal nanosilica/polycarboxylate ether superplasticizer nanocomposite and graphene oxide on properties of fly ash blended cement

Xie, Zhiyi; Zhou, Han; Li, Qingchao; he, Cheng; zhang, Shupeng; Li, Dongxu

doi:10.1016/j.conbuildmat.2020.120767

Cited by 8 publications

(3 citation statements)

References 47 publications

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“…Blending fly ash increases C–S–H formed at lower Ca/Si ratio along with amount of AF m phases. Fly ash, being pozzolanic material, remains non-reactive until the development of calcium hydroxide from the cement reaction in the system [ 57 ]. For fly ash containing CaO more than 20%, Papadakis [ 56 ] suggests that due to the synchronous pozzolanic and cementitious reactions of FA with cement, the hydration is much more complicated as compared to other blended cements.…”

Section: Hydration Mechanismmentioning

confidence: 99%

“…Apart from this, PCE-based superplasticizer also activated the pozzolanic reactions of the MK and GGBFS, resulting in the formation of secondary C–S–H in the hardened cement [ 90 , 91 ]. Xie et al [ 57 ] investigated the effect of FA on the heat released from cement paste. It was observed that PCE-based superplasticizer accelerated the hydration rate of cement paste.…”

Section: Fresh Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

A systematic study on sustainable low carbon cement – Superplasticizer interaction: Fresh, mechanical, microstructural and durability characteristics

Bhandari,

Kumar,

Sofi

et al. 2023

Heliyon

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Section: Hydration Mechanismmentioning

confidence: 99%

Section: Fresh Propertiesmentioning

confidence: 99%

A systematic study on sustainable low carbon cement – Superplasticizer interaction: Fresh, mechanical, microstructural and durability characteristics

Bhandari,

Kumar,

Sofi

et al. 2023

Heliyon

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“…The effects of NS powder and SS on the hydration of cement were compared. It was found that compared with NS powder, SS could significantly accelerate the process of hydration and further improve the mechanical properties of cement [27][28][29][30]. GO also has similar problems, due to the strong Van der Waals self-attraction and ionization interference, GO is prone to agglomeration in the alkaline environment of cement paste, limiting its strengthening effect on cement.…”

Section: Introductionmentioning

confidence: 99%

Effects of Graphene Oxide Encapsulated Silica Fume and Its Mixing with Nano-Silica Sol on Properties of Fly Ash-Mixed Cement Composites

et al. 2022

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In the present research work, the ternary effects of varying dosages of graphene oxide encapsulated silica fume (GOSF), nano-silica sol (SS), and fly ash (FA) on the rheological properties, compressive strength, the content and crystal size of calcium hydroxide (CH), porosity, water absorption, and microstructure of cement were studied. The results showed that the incorporation of SF improved the dispersion of GO in the cement matrix. GOSF was prepared through electrostatic attraction between the positively charged SF and negatively charged GO. The ternary mixture of GOSF, SS, and FA had a synergistic effect that improved the performance of cement. When the curing age of cement reached 28 days, the compressive strength reached a peak of 86.5 MPa, the minimum values of content and crystal size of CH were 11.55% and 45.69 nm, respectively, and the minimum values of water absorption and porosity were 0.0011 cm/s0.5 and 13.56%, respectively. In terms of microstructure, the denser structure of C-S-H gel and the regular arrangement of CH were noticed.

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Evaluation of the acid degradation properties of colloidal nanosilica‐based cement pastes

Muthu,

Sadowski

2024

Structural Concrete

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The present study examined the effects of colloidal nanosilica on the performance of cement paste samples exposed to nitric acid for a continuous period of 28 days. Compressive strength and weight losses in paste samples as a result of this attack were determined to be 66% and 27%. The inclusion of nanosilica up to 6% by weight reduced these sample losses by densifying the microstructure with its pore filling and pozzolanic effects. The addition of nanosilica decreased the flow of cement paste by 30%, but improved compressive and flexural strengths at the end of 28 days by up to 45% and 118%. The acid attack on the cement sample resulted in the formation of a degraded layer surrounding the unaltered core material. X‐ray tomography images showed this zone formation, and the scanning electron microscopy images revealed the degraded microstructure. The results of the x‐ray diffraction and nanoindentation tests confirmed the complete decalcification of the main cement hydrates, including calcium silicate hydrate and portlandite, as a result of acid attack. The results obtained suggest that the incorporation of nanosilica strengthens the microstructure of the cement matrix, thus improving the service life of structural concrete operating in chemical environments.

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Effects of colloidal nanosilica/polycarboxylate ether superplasticizer nanocomposite and graphene oxide on properties of fly ash blended cement

Cited by 8 publications

References 47 publications

A systematic study on sustainable low carbon cement – Superplasticizer interaction: Fresh, mechanical, microstructural and durability characteristics

A systematic study on sustainable low carbon cement – Superplasticizer interaction: Fresh, mechanical, microstructural and durability characteristics

Effects of Graphene Oxide Encapsulated Silica Fume and Its Mixing with Nano-Silica Sol on Properties of Fly Ash-Mixed Cement Composites

Evaluation of the acid degradation properties of colloidal nanosilica‐based cement pastes

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