Effects of nano-SiO2 particles on the mechanical and microstructural properties of ultra-high performance cementitious composites

Rong, Zhidan; Sun, Wei; Xiao, H.J.; Jiang, Guang

doi:10.1016/j.cemconcomp.2014.11.001

Cited by 242 publications

(125 citation statements)

References 24 publications

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“…A porosity reduction and a pore refinement for mixture containing nanosilica, both determined by mercury intrusion porosimetry (MIP), have been reported in [7,12,15]. These results are similar to those reported in [11] for material's water penetration depth.…”

Section: Introductionsupporting

confidence: 81%

“…The flexural strength and elastic modulus present the same tendency for optimum nano-silica contents obtained for compressive strength, as reported in [7][8][9]12].…”

supporting

confidence: 54%

“…The results published in [9] show a maximum gain on compressive strength for mixtures containing 2.82 wt% of nano-silica. In [10][11][12], the optimum content for mixtures containing 3 wt% of nano-silica was observed. In [13] the maximum compressive strength occurred for mixtures formulated with 4 wt% of nano-silica.…”

mentioning

confidence: 99%

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Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Mendes

Repette

Reis³

2017

Cerâmica

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INTRODUCTIONNowadays, nanoparticles such as silicon dioxide [1][2][3], Portland cement [4], and carbon nanotubes (CNT) [5,6] have been tested in ultra-high strength concretes in order to improve their performance. The results published in [7] show an optimum nano-silica content, i.e. the smallest quantity of nano-particles that leaded to the maximum compressive strength gain, for mixtures containing 0.5 wt% of silica nanoparticles. In [8], the maximum gain on compressive strength was observed for mixtures containing 2 wt% of nano-silica. The results published in [9] show a maximum gain on compressive strength for mixtures containing 2.82 wt% of nano-silica. In [10][11][12], the optimum content for mixtures containing 3 wt% of nano-silica was observed. In [13] the maximum compressive strength occurred for mixtures formulated with 4 wt% of nano-silica. Results published in [14] exhibit a tendency of linear increase on compressive strength, reaching the maximum strength for concretes formulated with 5 wt% of nanoparticles. In [15] the optimum nano-silica content was reached for mixtures containing 6% of nanoparticles. For large amounts of nanoCerâmica 63 (2017) [387][388][389][390][391][392][393][394] http://dx.doi.org/10.1590/0366-69132017633672037Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete (Efeitos da nanossílica no desempenho mecânico e microestrutura de concretos de ultra-alta resistência) UEL, Londrina, PR thiagomendes@utfpr.edu.br, wellington.repette@gmail.br, pjlondrina@yahoo.com.br AbstractThe use of nanoparticles in ultra-high strength concretes can result in a positive effect on mechanical performance of these cementitious materials. This study evaluated mixtures containing 10 and 20 wt% of silica fume, for which the optimum nano-silica content was determined, i.e. the quantity of nano-silica that resulted on the higher gain of strength. The physical characterization of raw materials was done in terms of particle size distribution, density and specific surface area. Chemical and mineralogical compositions of materials were obtained through fluorescence and X-ray diffraction. The mechanical performance was evaluated by compressive strength, flexural strength and dynamic elastic modulus measurements. The microstructural analysis of mixtures containing nano-silica was performed by X-ray diffraction, thermogravimetry, mercury intrusion porosimetry and scanning electron microscopy. Obtained results indicate an optimum content of nano-silica of 0.62 wt%, considering compressive and flexural strengths. This performance improvement was directly related to two important microstructural aspects: the packing effect and pozzolanic reaction of nano-silica. Keywords: ultra-high strength, nano-silica, mechanical performance, microstructure. silica, the maximum gain on mechanical properties for mixtures formulated with 10 wt% of silica nanoparticles was reported [16]. The flexural strength and elastic modulus present the same tendency for optimum nano-si...

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Section: Introductionsupporting

confidence: 81%

“…The flexural strength and elastic modulus present the same tendency for optimum nano-silica contents obtained for compressive strength, as reported in [7][8][9]12].…”

supporting

confidence: 54%

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Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Mendes

Repette

Reis³

2017

Cerâmica

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“…Ghafari et al (2014) reported an increase in compressive strength of UHPC with higher dosage of nano-silica (nS). An optimum amount of nS was reported to be 3.74 % by binder mass (Rong et al 2015;Yu et al 2014). Moreover, it was observed that the addition of nS in UHPC mixtures decreased the corrosion rate of steel rebar (Ghafari et al 2015).…”

Section: Nano-materialsmentioning

confidence: 99%

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Abbas

Nehdi

Saleem

2016

Int J Concr Struct Mater

321

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In this study, an extensive literature review has been conducted on the material characterization of UHPC and its potential for large-scale field applicability. The successful production of ultra-high performance concrete (UHPC) depends on its material ingredients and mixture proportioning, which leads to denser and relatively more homogenous particle packing. A database was compiled from various research and field studies around the world on the mechanical and durability performance of UHPC. It is shown that UHPC provides a viable and long-term solution for improved sustainable construction owing to its ultrahigh strength properties, improved fatigue behavior and very low porosity, leading to excellent resistance against aggressive environments. The literature review revealed that the curing regimes and fiber dosage are the main factors that control the mechanical and durability properties of UHPC. Currently, the applications of UHPC in construction are very limited due to its higher initial cost, lack of contractor experience and the absence of widely accepted design provisions. However, sustained research progress in producing UHPC using locally available materials under normal curing conditions should reduce its material cost. Current challenges regarding the implementation of UHPC in full-scale structures are highlighted. This study strives to assist engineers, consultants, contractors and other construction industry stakeholders to better understand the unique characteristics and capabilities of UHPC, which should demystify this resilient and sustainable construction material.

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“…To respond to constant curiosity around nanotechnology in cement and concrete research area, various nanoparticles, such as nanoSiO 2 [6], nano-Al 2 O 3 [7], nano-TiO 2 [8,9], nanoclay [10], and graphene [11], have been added to enhance the early age properties of cementitious materials. Among all the nanoparticles, the incorporation of nano-SiO 2 (NS) into cementitious materials has been most extensively studied and shows the high potential of commercial application, which may be attributed to two main reasons: (1) the affinity 2 Advances in Materials Science and Engineering with cement hydration products at molecular scale and (2) a reasonable price resulting from industrial-scale production.…”

Section: Introductionmentioning

confidence: 99%

Modifying Cement Hydration with NS@PCE Core-Shell Nanoparticles

Ran²,

She

et al. 2017

Advances in Materials Science and Engineering

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It is generally accepted that fine particles could accelerate cement hydration process, or, more specifically, this accelerating effect can be attributed to additional surface area introduced by fine particles. In addition to this view, the surface state of fine particles is also an important factor, especially for nanoparticles. In the previous study, a series of nano-SiO 2 -polycarboxylate superplasticizer core-shell nanoparticles (NS@PCE) were synthesized, which have a similar particle size distribution but different surface properties. In this study, the impact of NS@PCE on cement hydration was investigated by heat flow calorimetry, mechanical property measurement, XRD, and SEM. Results show that, among a series of NS@PCE, NS@PCE-2 with a moderate shell-core ratio appeared to be more effective in accelerating cement hydration. As dosage increases, the efficiency of NS@PCE-2 would reach a plateau which is quantified by various characteristic values. Compressive strength results indicate that strength has a linear correlation with cumulative heat release. A hypothesis was proposed to explain the modification effect of NS@PCE, which highlights a balance between initial dispersion and pozzolanic reactivity. This paper provides a new understanding for the surface modification of supplementary cementitious materials and their application and also sheds a new light on nano-SiO 2 for optimizing cement-based materials.

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Effects of nano-SiO2 particles on the mechanical and microstructural properties of ultra-high performance cementitious composites

Cited by 242 publications

References 24 publications

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Modifying Cement Hydration with NS@PCE Core-Shell Nanoparticles

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