Nanosilica and its Future Prospects in Concrete

Fares, Galal; Khan, M. Iqbal

doi:10.4028/www.scientific.net/amr.658.50

Cited by 4 publications

(7 citation statements)

References 25 publications

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“…There are two major nS production methods used, encompassing thermal treatment or not: pyrogenic or non-pyrogenic, accordingly. 66,70 Amorphous nS particles are produced by polymerisation of monomers and can be classified in six major categories, depending on the method of production. These are the following:…”

Section: Addition Of Ns Particles To Cement Pastes On Production Of N...mentioning

confidence: 99%

“…According to Fares and Khan, 66 the foreseen global need for silica (natural, biogenic or synthesised) for concrete will reach 2.7 million tonnes with a total cost estimation approaching 3.9 billion British pounds by 2014. Nanosilica is essentially nanosized silica, produced by reducing the particle size of silica powder to the nanometric level through a number of different processes.…”

Section: Addition Of Ns Particles To Cement Pastesmentioning

confidence: 99%

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Effect of nanosilica and montmorillonite nanoclay particles on cement hydration and microstructure

Papatzani

2016

Materials Science and Technology

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The need to produce sustainable cements has driven research towards nanotechnology. The main cement hydration product, calcium silicate hydrate, is nanosized; hence, the addition of nanoparticles to blended Portland cement formulations can remarkably modify mechanical strength, porosity and durability. The present paper discusses the material aspects of two different nanoparticles, nanosilica and montmorillonite nanoclay, the complications that arise from their addition to cement pastes and ways to mitigate these limitations. It is deduced that nanosilica solids in blended cement pastes should be limited to 0.5, whereas nanoclay solids to almost 1 mass- binder. Competitive reactivity of nanoparticles with other constituents is expected, and the possible pozzolanic activity is critically addressed. Notwithstanding progress made, there are significant potentials related to inorganic nanoclays.

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Section: Addition Of Ns Particles To Cement Pastes On Production Of N...mentioning

confidence: 99%

Section: Addition Of Ns Particles To Cement Pastesmentioning

confidence: 99%

Effect of nanosilica and montmorillonite nanoclay particles on cement hydration and microstructure

Papatzani

2016

Materials Science and Technology

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“…Complex studies regarding NS in concrete have to be carried out in the future partly due to the several types of NS, among which colloidal nanosilica (CNS) and fumed nanosilica (FNS) are probably the most common types. At the same time, there are no available data on the ballistic performance of UHPC with NS at all [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Fumed Nanosilica on Ballistic Performance of UHPCs

et al. 2023

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This research delves into the potential use of fumed nanosilica in ultra-high performance concrete for ballistic protection. First, the mechanical properties, slump flow, and specific gravity of UHPC with different contents of Aerosil 200 were determined. Then, calorimetric studies were conducted on these cement composites. Lastly, the differential efficiency factor and spalling area of UHPC with fumed nanosilica were determined. It was found out that the slump flow, the mechanical properties, and differential efficiency factor are slightly decreased by the addition of fumed nanosilica. However, the addition of the fumed nanosilica is beneficial in terms of the spalling area decrease and it is highly reactive during the induction period. Some of the results are supported by BSEM imaging.

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“…It is noted that RHA is one of the most SiO 2 -rich materials, with concentrations ranging from 90% to 98% in terms of volume and containing a considerable quantity of amorphous silica (85-95%) [4], making it an attractive source of raw materials for SiO 2 production [5,6]. Various methods of NS production are available and vary from expensive to cost-effective routes [7], such as sol-gel, chemical precipitation, microemulsion, and hydrothermal techniques [8].…”

Section: Introductionmentioning

confidence: 99%

“…1 C-Cement, 2 S-Sand,3 CA-Coarse Aggregate, 4 NS-nano SiO 2 , 5 SF-Silica Fume,6 SP-Superplasticizer,7 W/B-Water/Binder (cement + SF + NS).…”

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confidence: 99%

Mechanical Properties of High Strength Concrete Containing Nano SiO2 Made from Rice Husk Ash in Southern Vietnam

Tran

Phan

2021

Crystals

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This paper presents the experimental results of the production of Nano-SiO2 (NS) from rice husk ash (RHA) and the engineering properties of High Strength Concrete (HSC) containing various NS contents. Firstly, the mesoporous silica nanoparticles were effectively modulated from RHA using NaOH solution, and subsequently precipitated with HCl solution until the pH value reached 3. The optimum synthesis for the manufacture of SiO2 nanoparticles in the weight ratio of RHA/NaOH was 1:2.4, and the product was calcined at 550 °C for 2 h. The EDX, XRD, SEM, TEM, FT-IR, and BET techniques were used to characterize the NS products. Results revealed that the characteristics of the obtained NS were satisfactory for civil engineering materials. Secondly, the HSC was manufactured with the aforementioned NS contents. NS particles were added to HSC at various replacements of 0, 0.5, 1.0, 1.5, 2.0, and 2.5% by the mass of the binder. The water-to-binder ratio was remained at 0.3 for all mixes. The specimens were cured for 3, 7, 28, 25 days under 25 ± 2 °C and a relative humidity of 95% before testing compressive and flexural strengths. Chloride ion permeability was investigated at 28 and 56 days. Results indicated that the addition of NS dramatically enhanced compressive strength, flexural strength, chloride ion resistance, and reduced chloride ion permeability compared to control concrete. The optimal NS content was found at 1.5%, which yielded the highest strength and lowest chloride ion permeability. Next, the development of flexural and compressive strengths with an age curing of 3–28 days can be analytically described by a logarithmic equation with R2 ≥ 0.74. The ACI code was used, and the compressive strength at t-day was determined based on 28 days with R2 ≥ 0.95. The study is expected to solve the redundancy of waste RHA in southern Vietnam by making RHA a helpful additive when producing high-strength concrete and contributing meaningfully to a sustainable environment.

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Nanosilica and its Future Prospects in Concrete

Cited by 4 publications

References 25 publications

Effect of nanosilica and montmorillonite nanoclay particles on cement hydration and microstructure

Effect of nanosilica and montmorillonite nanoclay particles on cement hydration and microstructure

Influence of Fumed Nanosilica on Ballistic Performance of UHPCs

Mechanical Properties of High Strength Concrete Containing Nano SiO2 Made from Rice Husk Ash in Southern Vietnam

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