The role of nanoparticles in decreased washout of underwater concrete

Grzeszczyk, Stefania; Jurowski, Krystian; Bosowska, Kornelia; Grzymek, Marek

doi:10.1016/j.conbuildmat.2019.01.118

Cited by 55 publications

(22 citation statements)

References 12 publications

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“…frost resistance, compressive and bending strength, or resistance to aging. [27][28][29][30][31] When summing up the above, there is a lack of detailed results of studies on the impact of amorphous SiO 2 nanospheres contained in the cement mortar of the overlay in concrete floors on its bonding with the concrete substrate, as well as on its functional parameters. Therefore, the question arises of what the influence of the content of amorphous SiO 2 nanospheres on the bonding between the overlay and the concrete substrate is.…”

Section: Introductionmentioning

confidence: 99%

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

Szymanowski

Sadowski

2019

The Journal of Adhesion

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In civil engineering, overlays should have appropriate strength and functional parameters. In order to obtain these parameters to the desired level, additional actions are applied in the form of dispersed reinforcement, surface hardening and impregnation. There is a lack of detailed results of studies on the impact of amorphous SiO 2 nanospheres contained in the cement mortar of the overlay in concrete floors on its bonding with the concrete substrate, as well as on its functional parameters. Considering the above, the article presents the results of research regarding the impact of amorphous SiO 2 nanospheres. It was also shown that the most favourable results (understood as lower abrasion resistance, higher subsurface tensile strength and a higher overlay hardness), when compared to the reference mortar, are achieved with the use of amorphous SiO 2 nanospheres in an amount of 0.5% in relation to the cement mass. This is confirmed by studies carried out using scanning electron microscopy, which confirmed that these improvements are due to the fact that the mortar with the addition of amorphous SiO 2 nanospheres in an amount of 0.5% of the cement mass is characterized by a lower ratio of pores within the range from 0.83 to 7.50 μm.

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Section: Introductionmentioning

confidence: 99%

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

Szymanowski

Sadowski

2019

The Journal of Adhesion

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“…Admixture of nano-silica (NP) was also used. A chemical structure of admixtures used is described in the paper [9]. Chemical composition of CEM I cement is presented in Table 1.…”

Section: Materials For Testingmentioning

confidence: 99%

“…A particular attention was paid to properties of the cement paste, contains 0.75% AWA, 2.0% SP and 0.5% NP. For that composition of admixtures, the highest underwater concrete washout resistance was achieved [9]. A water-cement ratio used in testing was as follows: w/c=0.40 for pastes without SP and w/c = 0.27 with SP.…”

Section: Materials For Testingmentioning

confidence: 99%

“…The flowability and washout resistance of underwater concrete mixes depend mainly on the addition of AWA and SP [2], but, as proved by tests of the concrete washout resistance, they also strongly depend on the content of dust fractions in the binder. A particularly favourable impact on the washout properties is observed in case of silica fumes [6][7], limestone powder [8], blast furnace slag and fly ashes [1], as well as a small amount of nanoparticles added to the cement [9]. Both chemical admixtures and mineral additives to the cement used in the underwater concrete technology have the impact on the cement hydration process and the rheological properties of concrete mix.…”

Section: Introductionmentioning

confidence: 99%

“…AWA is generally considered as a factor that delays the cement hydration process in the initial period. It is mainly due to formation of a dense network of AWA polymer chains that hinder migration of water particles and other fine particles [9]. According to authors of the paper [11], AWA may disturb dissolution of cement anhydrous phases, nucleation of hydrates and their growth.…”

Section: Introductionmentioning

confidence: 99%

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Impact of admixtures used in underwater concrete on cement hydration process and rheological properties

et al. 2020

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This paper presents test results of the impact of chemical admixtures used in the underwater concrete technology, i.e. a superplasticizer (SP), an anti-wash admixture (AWA) and SiO2 nano- particles (NP) on the cement hydration process, rheological properties and the setting time. The impact of admixtures was tested in combination and separately, with the use of microcalimetry, X-ray diffraction (XRD) and rheology. It was demonstrated that AWA and SP admixtures caused a delay of the hydration process, while the impact of SP was much greater. The above statement was also confirmed by results of rheological tests. Combined application of AWA, SP and NP causes even a larger delay of the hydration process and the increase of paste rheological parameters, with the impact of the superplasticizer particularly visible.

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Underwater Concrete—Impact of Fine Particles in Cement on Washout Resistance of the Concrete Mix

Grzeszczyk

Jurowski

2021

Lecture Notes in Civil Engineering

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The role of nanoparticles in decreased washout of underwater concrete

Cited by 55 publications

References 12 publications

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

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

Impact of admixtures used in underwater concrete on cement hydration process and rheological properties

Underwater Concrete—Impact of Fine Particles in Cement on Washout Resistance of the Concrete Mix

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