Role of Nano-Silica on the Early-Age Performance of Natural Pozzolan-Based Blended Cement

Yıldırım, Gürkan; Dundar, Burak; Alam, Burhan; Yaman, İsmail Özgür; Şahmaran, Mustafa

doi:10.14359/51706848

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…Nano silica (NS) ordered from Norway was used as a partial replacement to improve the chemical resistance of the GPC (Lloyd and Rangan, 2010). Previous studies reported the use of NS in NC specimens due to its beneficial effect on the durability and mechanical performance (Al-Najjar et al, 2016; Yeşilmen et al, 2015; Yıldırım et al, 2018). It was also reported by Adak et al (2014) that addition of 6% NS increased the compressive strength of GPC.…”

Section: Experimental Studiesmentioning

confidence: 99%

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

Alzeebaree

Çevik

Mohammedameen

et al. 2019

Advances in Structural Engineering

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In the study, mechanical properties and durability performance of confined/unconfined geopolymer concrete and ordinary concrete specimens were investigated under ambient and seawater environments. Some of the specimens were confined by carbon fiber and basalt fiber–reinforced polymer fabric materials with one layer and three layers under chloride and ambient environments to observe mechanical strength contribution and durability performances of these hybrid types of materials. These fiber-reinforced polymer fabric materials were also evaluated in terms of retrofit purposes especially in the marine structures. In addition, microstructural evaluation is also conducted using scanning electron microscope on geopolymer concrete and ordinary concrete specimens to observe the amount of deterioration in microscale due to the chloride attacks. Results indicated that confined specimens exhibited enhanced strength, ductility, and durability properties than unconfined specimens, and the degree of the enhancement depended on the fiber-reinforced polymer confinement type and the number of fiber-reinforced polymer layer. Specimens confined by carbon fabrics with three layers showed superior mechanical properties and durability performance against chloride attack, while specimens confined by basalt fabrics with one layer exhibited low performance, and unconfined specimens showed the worst performance. Both fiber-reinforced polymer fabric materials can be utilized as retrofit materials in structural elements against chloride attacks. The results also pointed out that seawater attack reduced the ductility performance of the geopolymer concrete and ordinary concrete specimens. Furthermore, geopolymer concrete specimens were found more durable than the ordinary concrete specimens, and both types of concretes exhibited similar fracture properties, indicating that geopolymer concrete can be utilized for structural elements instead of ordinary concretes.

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Section: Experimental Studiesmentioning

confidence: 99%

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

Alzeebaree

Çevik

Mohammedameen

et al. 2019

Advances in Structural Engineering

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“…To overcome this obstacle, various accelerating methods have been proposed, including the incorporation of nanomaterials such as nanosilica-SiO 2 -which contributes to a significant acceleration of the cement hydration process. Various studies have confirmed the accelerating effects of nanosilica in OPC and blended cementitious systems (Singh et al 2011;Ragab 2014, 2015;Heikal et al 2016;Abdel Gawwad et al 2017;Skoczylas and Rucińska 2018a, b;Yıldırım et al 2018;Krivenko et al 2019;Sikora et al 2019a;Sanytsky et al 2020).…”

Section: Introductionmentioning

confidence: 92%

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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This study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Recently, new nanomaterials with superior physical properties have brought novelty for significantly improving the mechanical properties and durability of cementitious composites for numerous chemical/engineering applications [6,7]. For example, nano-SiO 2 material has been successfully used to inhibit the generation and propagation of micro cracks by filling the micro-voids of concrete, which accordingly improved the bearing capacity and fracture toughness of concrete [8,9]; On the other hand, nano-sized CaCO 3 has shown potential to accelerate the hydration reactions of C 3 A and C 3 S through seeding effects, which inherently promotes the formation of C-S-H and accordingly enhanced the mechanical properties of concrete [10].…”

Section: Introductionmentioning

confidence: 99%

Modification of cementitious composites with graphene oxide and carbon nanotubes

2020

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Both graphene oxide (GO) and carbon nanotubes (CNTs) are carbon-based nanomaterials. Due to their favorable dispersibility in water and excellent mechanical properties, they are potential additives for use as reinforcements in cementitious composites. In this laboratory study, GO and CNTs were simultaneously used as additives to improve the mechanical properties (e.g., compressive strength) and durability (e.g., frost resistance, water impermeability) of cementitious composites. To maintain and optimize the mortar fluidity, fly ash (20% by the mass of the cementitious materials) was also added into the cementitious composite. Based on the laboratory test results, the compressive strength of the cementitious composite was maximized to 43.50 MPa with an optimal dosage of 0.08% GO, by weight of the total mixture. Addition of 0.04% GO (by total mixture weight) and higher dosages of up to 0.08% exhibited a strengthening effect on the cement composites due to the simultaneous bridging effect of 0.15% CNTs and the nucleation effect of GO. Furthermore, the addition of GO and CNTs contributed to improving the freeze-thawing resistance and impermeability of the cementitious composites. Overall, the study results indicated that the addition of GO and CNTs could potentially improve the mechanical properties and durability of cementitious composites, which could be very beneficial for various industrial applications such as concrete roads or building constructions.

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Role of Nano-Silica on the Early-Age Performance of Natural Pozzolan-Based Blended Cement

Cited by 10 publications

References 27 publications

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

The effects of seawater and nanosilica on the performance of blended cements and composites

Modification of cementitious composites with graphene oxide and carbon nanotubes

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