Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 2. Confined-DEC versus oven curing

Ziolkowski, Mateusz

doi:10.1016/j.conbuildmat.2018.05.041

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…This is a unique concept with great room for future research. The second part of this study (Part 2: Confined-DEC versus oven curing [46]) will be published as a follow-up to Part 1.…”

Section: Resultsmentioning

confidence: 99%

Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 1. Factorial experimental design

Ziolkowski

2017

Construction and Building Materials

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The utilisation of fly ash is a global concern. Under conditions of mass production and rapid turnover in automated plants, a reduction in the curing duration of alkali-activated fly ash based mixtures is sought-after. An alternative accelerated curing technique, confined-DEC (Direct Electric Curing), with the binding mechanism of NaOH activation of fly ash was investigated for the rapid manufacture of fly ash based bricks. This concept is a potentially viable alternative solution for high-volume fly ash utilisation. The investigation revealed that the confined-DEC technique shows great promise in the rapid accelerated curing of NaOH-activated fly ash based brick mixtures. The best induced design conditions, a mixture consisting of 4.1% NaOH, 9% water and 86.9% fly ash by weight, simultaneously subjected to a confining pressure of 10 MPa and a voltage gradient of 0.8 V/mm, obtained a compressive strength of 11.5 MPa in 7 minutes and the mixture continued to increase in compressive strength after the application of confined-DEC, acquiring a compressive strength *Revised Manuscript of 20.1 MPa at 28 days. The investigation also revealed the limitations of confined-DEC under free drainage conditions.

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“…This is a unique concept with great room for future research. The second part of this study (Part 2: Confined-DEC versus oven curing [46]) will be published as a follow-up to Part 1.…”

Section: Resultsmentioning

confidence: 99%

Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 1. Factorial experimental design

Ziolkowski

2017

Construction and Building Materials

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“…At present, a series of research results proved that OH curing could improve the strength formation of cement-based materials. Kovtun [6,7] utilized direct current for OH curing of alkali activated cementitious materials containing fly ash under positive temperature. Temperature development was found to be closely related to the formation of strength with different voltage gradient conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Temperature Development of Ohmic Heating Cured Nonmass Concrete under Subzero Temperature

Zhou

Tian

et al. 2021

Advances in Civil Engineering

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In this paper, carbon fiber/carbon nanofiber strengthening nonmass concrete slab was designed, and ohmic heating (OH) curing was used to promote the strength formation of the slab under −20°C. COMSOL multiphysical field coupling program has been used to simulate the heating process of nonmass concrete slabs under different conditions. COMSOL analysis results showed that the optimal loading power density of OH cured sample under −20°C was 1000 W/m2∼1200 W/m2. Moreover, numerical analysis results were experimentally validated by the multipoint temperature measurement method. Furthermore, the mechanical properties showed that the compressive strength of the sample cured by 2 days OH curing at −20°C reached up to 48.2 MPa. SEM analysis exhibited that OH curing could improve the interfacial transition zone (ITZ) between the fiber and the matrix, leading to a denser microstructure. This study proved that COMSOL program could provide good theoretical guidance for OH cured nonmass cement concrete under subzero temperature. This work establishes an accurate guideline for electric power supplementation, laying a solid foundation of winter construction with high efficiency and low energy consumption.

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“…Uygunoğlu and Hocaoğlu [3] reported a decrease in final setting time for concrete specimens by applying potential difference. Other researchers also reported using electric curing method to accelerated early age strength of NaOh-activated fly ash based brick mixture [16] and alkali activated fly ash concrete [17].…”

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confidence: 99%

Electric curing parameters of mortar and its mechanical properties in cold weather

Abubakri

Mangat

Starinieri

et al. 2022

Construction and Building Materials

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Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 2. Confined-DEC versus oven curing

Cited by 12 publications

References 20 publications

Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 1. Factorial experimental design

Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 1. Factorial experimental design

Experimental and Numerical Investigation of Temperature Development of Ohmic Heating Cured Nonmass Concrete under Subzero Temperature

Electric curing parameters of mortar and its mechanical properties in cold weather

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