A study on the effect of nano silica on compressive strength of high volume fly ash mortars and concretes

Shaikh, Faiz Uddin Ahmed; Supit, Steve W.M.; Sarker, Prabir Kumar

doi:10.1016/j.matdes.2014.04.025

Cited by 288 publications

(115 citation statements)

References 18 publications

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“…Owing to its very small size (in the range of nanometers) and the pozzolanic reaction, nanosilica particles are very e ective in enhancing the performance of concrete [23]. Nanomaterial, particularly nano-SiO 2 , has the ability to improve the strength [23,24] and the durability of concrete [17,25] through accelerating the hydration reaction and lling the micropores in the cement paste structure, thus decreasing the porosity of concrete which in turn results in strength enhancement. Nanosilica can not only reduce the porosity of the cement paste, but also helps to densify the ITZ between the aggregate particle and the cement paste [23].…”

Section: Introductionmentioning

confidence: 99%

“…Nanosilica can not only reduce the porosity of the cement paste, but also helps to densify the ITZ between the aggregate particle and the cement paste [23]. Studies [18,24,25] have shown that the addition of nanosilica results in increased compressive, tensile, and exural strength of conventional concrete. Studies on the use of nanosilica to upgrade the performance of RAC are very limited [26].…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Younis

Mustafa

2018

Advances in Materials Science and Engineering

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e aim of this paper was to examine the feasibility of using nanoparticles of SiO 2 (nanosilica) to improve the performance of recycled aggregate concrete (RAC) containing recycled aggregate (RA) derived from processing construction and demolition waste of concrete buildings. e examined properties include compressive strength, splitting tensile strength, and water absorption. e study also includes examining the microstructure of RA and RAC with and without nanoparticles of SiO 2 . In total, nine mixes were investigated. Two mixes with RA contents of 50% and 100% were investigated and for each RA content; three mixes were prepared with three different nanoparticles dosages 0.4%, 0.8%, and 1.2% (by mass of cement). A control mix with natural aggregate (NA) was also prepared for comparison reasons. e results show that nanoparticles of silica can improve the compressive strength, tensile strength, reduce the water absorption, and modify the microstructure of RAC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Younis

Mustafa

2018

Advances in Materials Science and Engineering

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“…In addition, a significant variation in the effect of nano silica on the percentage of strength improvement of high volume fly ash cement composites has been observed (Zhang and Islam 2012;Hou et al 2012;Shaikh et al 2014). Very few studies are available that report the properties of class F high volume fly ash cement composite replacing 80 % of cement (Liu 2010;Huang et al 2013).…”

Section: Introductionmentioning

confidence: 95%

“…The maximum increase in strength that they observed with 5 % CNS compared to 0 % CNS at 7 and 28 days was approximately 60 and 33 % respectively. Shaikh et al (Shaikh et al 2014) studied the effect of 2 % nano silica on 68 % FA blended cement composite and found that there was no difference in strength at 7 days but at 28 days there was 56 % increase in strength as compared to the mix not containing nano silica.…”

Section: Introductionmentioning

confidence: 99%

Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

Roychand

Silva

Law

et al. 2016

Int J Concr Struct Mater

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This paper presents the effect of silica fume and nano silica, used individually and in combination with the set accelerator and/or hydrated lime, on the properties of class F high volume ultra fine fly ash (HV-UFFA) cement composites, replacing 80 % of cement (OPC). Compressive strength test along with thermogravimetric analysis, X-ray diffraction and scanning electron microscopy were undertaken to study the effect of various elements on the physico-chemical behaviour of the blended composites. The results show that silica fume when used in combination with the set accelerator and hydrated lime in HV-UFFA cement mortar, improves its 7 and 28 day strength by 273 and 413 %, respectively, compared to the binary blended cement fly ash mortar. On the contrary, when nano silica is used in combination with set accelerator and hydrated lime in HV-UFFA cement mortar, the disjoining pressure in conjunction with the self-desiccation effect induces high early age micro cracking, resulting in hindering the development of compressive strength. However, when nano silica is used without the additives, it improves the 7 and 28 day strengths of HV-UFFA cement mortar by 918 and 567 %, respectively and the compressive strengths are comparable to that of OPC.

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“…By the addition of NS with HVFA or GGBS, reduction in setting time and increase in early gain of strength of concrete was achieved [8]. The alteration in compressive strength value of HVFA mortars and concrete due to the addition of NS was studied [9].…”

Section: Introductionmentioning

confidence: 99%

Impact of Micro Silca on the mechanical properties of high volume Fly Ash Concrete

Sripragadeesh¹,

Ramakrishnan

Pugazhmani³

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. In the current situation, to overcome the difficulties of feasible construction, concrete made with various mixtures of Ordinary Portland Cement (OPC) and diverse mineral admixtures, is the wise choice for engineering construction. Mineral admixtures viz. Ground Granulated Blast Furnace Slag (GGBS), Meta kaolin (MK), Fly Ash (FA) and Silica Fume (SF) etc. are used as Supplementary Cementitious Materials (SCM) in binary and ternary blend cement system to enhance the mechanical and durability properties. Investigation on the effect of different replacement levels of OPC in M25 grade with FA + SF in ternary cement blend on the strength characteristics and beam behavior was studied. The OPC was partially replaced (by weight) with different combinations of SF (5%, 10%, 15%, 20% and 25%) and FA as 50% (High Volume Fly Ash -HVFA). The amount of FA addition is kept constant at 50% for all combinations. The compressive strength and tensile strength tests on cube and cylinder specimens, at 7 and 28 days were carried out. Based on the compressive strength results, optimum mix proportion was found out and flexural behaviour was studied for the optimum mix. It was found that all the mixes (FA + SF) showed improvement in compressive strength over that of the control mix and the mix with 50% FA + 10% SF has 20% increase over the control mix. The tensile strength was also increased over the control mix. Flexural behaviour also showed a significant improvement in the mix with FA and SF over the control mix.

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A study on the effect of nano silica on compressive strength of high volume fly ash mortars and concretes

Cited by 288 publications

References 18 publications

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

Impact of Micro Silca on the mechanical properties of high volume Fly Ash Concrete

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A study on the effect of nano silica on compressive strength of high volume fly ash mortars and concretes

Cited by 288 publications

References 18 publications

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

Impact of Micro Silca on the mechanical properties of high volume Fly Ash Concrete

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Product

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Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete