Direct electric curing of in situ concrete

Wadhwa, Seema S.; Srivastava, Lokesh; Gautam, Diplesh; Chandra, Divya

doi:10.1080/09613218708726799

Cited by 9 publications

(8 citation statements)

References 1 publication

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“…current flow input is adjusted to the thickness of the element. DEC is also one of the most energy-efficient methods for accelerated curing [21,22]. The combination of confinement and DEC, confined-DEC, introduces a potentially novel approach in rapid accelerating curing of masonry units.…”

Section: The Limitations Encountered During the Heated Plate Curing Tmentioning

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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Section: The Limitations Encountered During the Heated Plate Curing Tmentioning

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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“…Furthermore, the paper does not address the various electrical and solar methods of heating that can be used to hasten the curing of concrete. [24][25][26][27] Conventional concrete (i.e., concrete without conductive admixtures) is electrically conductive, primarily due to ions, which originate mainly from the water in the concrete. Removal of water from concrete increases the resistivity.…”

Section: Introductionmentioning

confidence: 99%

Resistance heating using electrically conductive cements

Wang

Wen

Chung

2004

Advances in Cement Research

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Steel fibre (8 ìm diameter, 0 . 72 vol.%)-reinforced cement was found to be effective for resistance heating. A DC electrical power input of 5 . 6 W (7 . 1 V, 0 . 79 A) resulted in a maximum temperature of 608C (initial temperature ¼ 198C) and a time of 6 min to reach half the maximum temperature. Efficiency of energy conversion increased with time of heating, reaching 100% after 50 min. The heat power output per unit area was 750 W/m 2 for steel fibre cement, compared with 340 W/m 2 for a metal wire with the same resistance. The use of carbon fibres or graphite particles in place of steel fibres resulted in less effective heating, due to the higher resistivity.

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“…In response to the advantages and disadvantages of SC, a new direct electrical curing (EC) [15] method has been discovered by research scholars .EC uses fresh specimens with low resistivity [16] to generate uniform Joule heat under the current to accelerate the hydration of cement and enhance early mechanical properties. Existing studies mentioned in the literature [17] include the feasibility of EC application [18,19], field application [20], electrodes arrangement [21], curing regime [22,23], effects of hydration process and microstructure [24,25], mineral admixtures [26], durability [16,27] etc. The current mainstream research direction mainly uses Joule heating to solve the problem of winter construction at ultra-low temperatures [28][29][30][31], repair and reinforcement of building structures [32], strengthening concrete [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Mechanical Properties and Microstructure of Cement-Based Materials by Direct Electric Curing and Steam Curing

Yang¹,

He²,

Wang³

et al. 2021

Preprint

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Direct electric curing (EC) is a new green curing method for cement-based materials that improves the early mechanical properties via the uniform high temperature produced by Joule heating. To understand the effects of EC and steam curing (SC) on the mechanical properties and microstructure of cement-based materials, the mortar was cured at different temperature-controlled curing regimes (40°C, 60°C and 80°C). Meanwhile, mechanical properties, hydrate phase and pore structure of specimens were investigated. The energy consumption of two curing methods was compared and analyzed. The results show that the EC specimens have better and more stable growth of mechanical strength. The pore structure of EC specimen is also better than that of SC specimen at different maintenance ages. However, the hydration degree and products of samples cured by EC are similar to that SC samples. The energy consumption of EC is lower than SC. This study provides an important technical support for the EC in the production of energy-saving and high early-strength concrete precast components.

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Direct electric curing of in situ concrete

Cited by 9 publications

References 1 publication

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

Resistance heating using electrically conductive cements

A Comparative Study on the Mechanical Properties and Microstructure of Cement-Based Materials by Direct Electric Curing and Steam Curing

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