Chloride induced corrosion durability of high volume fly ash concretes containing nano particles

Shaikh, Faiz Uddin Ahmed; Supit, Steve W.M.

doi:10.1016/j.conbuildmat.2015.09.030

Cited by 164 publications

(52 citation statements)

References 21 publications

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“…erefore, nanoparticles could be considered as an alternative choice to serve as accelerators for cementitious materials under low temperatures. Numerous studies have been conducted on the utilization of nanoparticles, including nano-SiO 2 [12][13][14][15][16][17][18][19][20][21][22], nano-CaCO 3 [17,23,24], nano-Al 2 O 3 [16,20,25], nano-TiO 2 [14,16,[26][27][28][29][30][31][32][33][34][35][36][37][38], nano-Fe 2 O 3 [10,13], and nano-CuO [13,39], in cementitious materials to improve their durability and mechanical properties. Nano-SiO 2 is the most commonly used nanoparticle, while nano-TiO 2 is comparatively favorable for pavement structures in terms of aircleaning property.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Wang

Zhang

Gao

2018

Advances in Materials Science and Engineering

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Low temperature negatively affects the engineering performance of cementitious materials and hinders the construction productivity. Previous studies have already demonstrated that TiO 2 nanoparticles can accelerate cement hydration and enhance the strength development of cementitious materials at room temperature. However, the performance of cementitious materials containing TiO 2 nanoparticles at low temperatures is still unknown. In this study, specimens were prepared through the replacement of cement with 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, and 5 wt.% TiO 2 nanoparticles and cured under temperatures of 0°C, 5°C, 10°C, and 20°C for specific ages. Physical and mechanical properties of the specimens were evaluated through the setting time test, compressive strength test, flexural strength test, hydration degree test, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) analysis, thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM) in order to examine the performance of cementitious materials with and without TiO 2 nanoparticles at various curing temperatures. It was found that low temperature delayed the process of cement hydration while TiO 2 nanoparticles had a positive effect on accelerating the cement hydration and reducing the setting time in terms of the results of the setting time test, hydration degree test, and strength test, and the specimen with the addition of 2 wt.% TiO 2 nanoparticles showed the superior performance. Refined pore structure in the MIP tests, more mass loss of CH in TGA, intense peak appearance associated with the hydration products in XRD analysis, and denser microstructure in SEM demonstrated that the specimen with 2 wt.% TiO 2 nanoparticles exhibited preferable physical and mechanical properties compared with that without TiO 2 nanoparticles under various curing temperatures.

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Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Wang

Zhang

Gao

2018

Advances in Materials Science and Engineering

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“…In addition, it also reacts with tricalcium silicate and leads to calcium carbosilicate hydrate 22 . As a consequence, the presence of NC has a significant effect on the hydration of cement, which may accelerate early-age strength development, thus offset the negative effects of FA on early-age performances of FA concrete 23,24 . It is found that the short-term strength of FA concrete is improved by the addition of NC 25 .…”

Section: Introductionmentioning

confidence: 99%

High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

Yang

Che

Leng

2018

Sci Rep

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The mechanisms underlying the effects of nano-calcium carbonate (NC) on the strength of high volume fly ash (FA) mortar are discussed. Two NCs are used as 2%, 4%, 6%, and 8% by weight of cementitious materials. Hydrated products of fly ash mortar containing NC was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TG) and differential thermal gravity (DTG) analysis. Results indicate that NC could improve strength of FA mortar due to the more rapid growth of hydrated products induced by NC through additional nucleation sites. Corresponding to the highest measured strength of FA mortar, the optimal contents of NC are around 2%. In addition, the presence of 2% NC improved the microstructure of FA mortar after 180 days due to the formation of calcium carbonaluminate hydrate.

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“…Incorporation of NS has been proposed as a means to improve the strength [1][2][3] and the durability properties of cement composites [4][5][6]. It is broadly known that NS accelerates the early cement hydration rate.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nanosilica on Early Age Stages of Cement Hydration

Isfahani

Redaelli

et al. 2017

Journal of Nanomaterials

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Effects of nanosilica on cement hydration have been broadly investigated in the literature and early age cement hydration, as a whole, has been mainly considered, disregarding the substages of the hydration. The hydration of cement is characterized by different substages and nanosilica effect on the hydration could be a result of diverse, even contradictory, behavior of nanosilica in individual stages of the hydration. In this study, effects of nanosilica on different substages of cement hydration are investigated. Isothermal calorimetry results show that at early ages (initial 72 hours) the effects of nanosilica depend on the phenomenon by which the hydration is governed: when the hydration is chemically controlled, that is, during initial reaction, dormant period, and acceleratory period, the hydration rate is accelerated by adding nanosilica; when the hydration is governed by diffusion process, that is, during postacceleratory period, the hydration rate is decelerated by adding nanosilica. The Thermal Gravimetric Analysis on the samples at the hardened state (after 28 days of curing) reveals that, after adding nanosilica, the hydration degree slightly increased compared to the plain paste.

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Chloride induced corrosion durability of high volume fly ash concretes containing nano particles

Cited by 164 publications

References 21 publications

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

Effects of Nanosilica on Early Age Stages of Cement Hydration

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Chloride induced corrosion durability of high volume fly ash concretes containing nano particles

Cited by 164 publications

References 21 publications

Effect of TiO2 Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Effect of TiO2 Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

Effects of Nanosilica on Early Age Stages of Cement Hydration

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Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures