Insights into the positive effects of power ultrasound on the pore solution of Portland cement pastes

Ehsani, Ahmad; Ganjian, Eshmaiel; Mason, Timothy J.; Tyrer, Mark; Bateman, Mark

doi:10.1016/j.cemconcomp.2021.104302

Cited by 18 publications

(3 citation statements)

References 44 publications

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“…Power ultrasound with a frequency spectrum of 20 kHz-100 kHz finds numerous applications in chemistry and material processing due to its unique properties, which include cavitation, acoustic streaming, and sonochemistry [29][30][31]. US-T can initiate and accelerate chemical reactions through a phenomenon called acoustic cavitation.…”

Section: Ultrasound Treatment (Us-t) Methodologymentioning

confidence: 99%

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Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Lisowski,

Glinicki

2024

Applied Sciences

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The wide use of multi-component cement of highly reduced Portland clinker factor is largely impeded by detrimental changes in the rheological properties of concrete mixes, a substantial reduction in the early rate of cement hardening, and sometimes the insufficient strength of mature concrete. Therefore, major changes are needed in traditional concrete-production technologies if low-clinker cement is to gain wider acceptance. This review’s goal is to summarize the impacts of using non-ionizing radiation methods to improve the dispersion of concrete mix constituents, cement setting, and early hardening. The potential impacts of such interactions on the permeability and strength of concrete are also highlighted and investigated. Their intriguing potential for delivering additional energy to cementitious mixtures is analyzed for batch water, solid non-clinker constituents of cement (mainly supplementary cementitious materials), and their mixtures with aggregates. The advantages of adopting these non-traditional methods are found to be highly alluring to the greener preparation techniques used in the construction materials sector.

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Section: Ultrasound Treatment (Us-t) Methodologymentioning

confidence: 99%

“…Ultrasonic waves can also disperse and de-agglomerate particles in suspensions, emulsions, and colloidal systems. The cavitation forces break down larger particles into smaller ones, leading to improved stability and homogeneity of the material [29][30][31].…”

Section: Ultrasound Treatment (Us-t) Methodologymentioning

confidence: 99%

Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Lisowski,

Glinicki

2024

Applied Sciences

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“…There are different approaches to the activation of the hydration of the reactions of PC [ 9 ], alkali-activated [ 10 ] and lime [ 11 ] binders. The acceleration can be carried out by physical (for instance with power ultrasound [ 12 , 13 ]) or by chemical means. Next, the discussion is focussed on the use of acceleration admixtures for PC and BC binders.…”

Section: Introductionmentioning

confidence: 99%

Portland and Belite Cement Hydration Acceleration by C-S-H Seeds with Variable w/c Ratios

et al. 2022

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The acceleration of very early age cement hydration by C-S-H seeding is getting attention from scholars and field applications because the enhanced early age features do not compromise later age performances. This acceleration could be beneficial for several low-CO2 cements as a general drawback is usually the low very early age mechanical strengths. However, the mechanistic understanding of this acceleration in commercial cements is not complete. Reported here is a contribution to this understanding from the study of the effects of C-S-H gel seeding in one Portland cement and two belite cements at two widely studied water–cement ratios, 0.50 and 0.40. Two commercially available C-S-H nano-seed-based admixtures, i.e., Master X-Seed 130 and Master X-Seed STE-53, were investigated. A multi-technique approach was adopted by employing calorimetry, thermal analysis, powder diffraction (data analysed by the Rietveld method), mercury intrusion porosimetry, and mechanical strength determination. For instance, the compressive strength at 1 day for the PC (w/c = 0.50) sample increased from 15 MPa for the unseeded mortar to 24 and 22 MPs for the mortars seeded with the XS130 and STE53, respectively. The evolution of the amorphous contents was determined by adding an internal standard before recording the powder patterns. In summary, alite and belite phase hydrations, from the crystalline phase content evolutions, are not significantly accelerated by C-S-H seedings at the studied ages of 1 and 28 d for these cements. Conversely, the hydration rates of tetracalcium alumino-ferrate and tricalcium aluminate were significantly enhanced. It is noted that the degrees of reaction of C4AF for the PC paste (w/c = 0.40) were 10, 30, and 40% at 1, 7, and 28 days. After C-S-H seeding, the values increased to 20, 45, and 60%, respectively. This resulted in larger ettringite contents at very early ages but not at 28 days. At 28 days of hydration, larger amounts of carbonate-containing AFm-type phases were determined. Finally, and importantly, the admixtures yielded larger amounts of amorphous components in the pastes at later hydration ages. This is justified, in part, by the higher content of amorphous iron siliceous hydrogarnet from the enhanced C4AF reactivity.

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Understanding the thermal effect of power ultrasound in cement paste

Xiong

Wang

Zhou

et al. 2023

Applied Thermal Engineering

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Insights into the positive effects of power ultrasound on the pore solution of Portland cement pastes

Cited by 18 publications

References 44 publications

Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Portland and Belite Cement Hydration Acceleration by C-S-H Seeds with Variable w/c Ratios

Understanding the thermal effect of power ultrasound in cement paste

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