Functional and adhesive properties of cement-based overlays modified with amorphous silica nanospheres

Szymanowski, J.; Sadowski, Łukasz

doi:10.1080/00218464.2019.1663412

Cited by 29 publications

(16 citation statements)

References 34 publications

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“…Similar behavior, regarding the stronger influence of seawater on decreases in slag-blended cement setting times, as compared with OPC, has been reported by Etxeberria et al (2016b). The addition of NS has been shown to have a significant effect on decreasing the setting time of cement-based composites (Ye et al 2007;Chen et al 2016;Szymanowski and Sadowski 2019) and thus a combination of seawater and NS leads to further decreases in the setting time of pastes. In the case of pozzolan-blended cement, a combination of seawater and NS (SW3-P) leads to a reduction of initial and final setting times by 28% and 32%.…”

Section: Initial and Final Setting Timesupporting

confidence: 73%

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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Section: Initial and Final Setting Timesupporting

confidence: 73%

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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“…The addition of nanoparticles to cement-based composites is a new trend due to their increasing availability on the market and knowledge concerning their manufacturing [11][12][13]. The authors in [14] performed studies on overlays with the addition of amorphous silica nanospheres. Some properties such as subsurface tensile strength were improved, but abrasion resistance was worse when compared to the reference sample.…”

Section: Fig 2 Scheme Of Pores Formation After Mortar Bleeding Witmentioning

confidence: 99%

Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

et al. 2020

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This article presents studies that were performed in order to improve the subsurface properties of horizontally-formed cementitious composites using tin(II) fluoride nanoparticles. The main aim of the study was to solve the problem of the decrease in subsurface properties caused by mortar bleeding and the segregation of the aggregate along the height of the overlay. The article also aims to highlight the patch grabbing difficulties that occur during the process of forming horizontally-formed cementitious composites. Four specimens were analyzed: one reference sample and three samples modified with the addition of 0.5, 1.0, and 1.5% of tin(II) fluoride nanoparticles in relation to the cement mass. To analyze the mechanical properties of the specimens, non-destructive (ultrasonic pulse velocity) and destructive tests (flexural tensile strength, compressive strength, abrasion resistance, pull-off strength) were performed. It was indicated that due to the addition of the tin(II) fluoride, it was possible to enhance the subsurface tensile strength and abrasion resistance of the tested cementitious composites. To confirm the obtained macroscopic results, the porosity of the subsurface was measured using SEM. It was also shown that the addition of the tin(II) fluoride nanoparticles did not reduce its flexural and compressive strength. The results show that horizontally-formed cementitious composites with the addition of 1.0% of tin(II) fluoride nanoparticles in relation to the cement mass obtained the most effective mechanical performance, especially with regard to subsurface properties.

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“…When looking for opportunities to improve the natural environment, alternative material solutions should be tested (e.g., the use of marble and limestone powders) [ 7 , 8 ]. Scientists are trying to reduce the amount of cement in cementitious mixes by replacing it with supplementary cementitious materials (SCMs) [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Li et al [ 9 ] described the filler technology that is related to the addition of supplementary cementitious materials such as mineral powders to cementitious composites.…”

Section: Introductionmentioning

confidence: 99%

Granite Powder vs. Fly Ash for the Sustainable Production of Air-Cured Cementitious Mortars

Chajec

2021

Materials

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The partial replacement of cement in concrete with the addition of granite powder and fly ash can help to reduce the carbon dioxide (CO2) emissions into the atmosphere associated with cement production. The aim of the article is to compare the performance of granite powder and fly ash for the sustainable production of air-cured cementitious mortars. The morphological, chemical, and granulometric properties of these additives were first compared with the properties of cement. Afterward, a series of mortars modified with the addition of granite powder and fly ash was made. The properties of the fresh mixes and the mechanical properties of the hardened composites were then tested. Finally, based on the obtained results, a cost analysis of the profitability of modifying cementitious composites with granite powder or fly ash was investigated. The obtained results allow similarities and differences between granite powder and fly ash in relation to cement to be shown. To conclude, it should be stated that both of these materials can successfully be used for the sustainable production of air-cured cementitious composites. This conclusion has a significant impact on the possibility of improving the natural environment by reducing the amount of cement production. More sustainable production of cement-based materials could enable CO2 emissions to be decreased. The use of granite powder for the production of cementitious mortars can significantly reduce the amount of this material deposited in landfills.

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Functional and adhesive properties of cement-based overlays modified with amorphous silica nanospheres

Cited by 29 publications

References 34 publications

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

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

Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

Granite Powder vs. Fly Ash for the Sustainable Production of Air-Cured Cementitious Mortars

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