Microwave curing of Portland cement concrete: experimental results and feasibility for practical applications

Leung, Christopher Kin Ying; Pheeraphan, Thanakorn

doi:10.1016/0950-0618(94)00001-i

Cited by 85 publications

(22 citation statements)

References 5 publications

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“…hours [30]. For steam curing, the advantages are also offset by durability issues associated with the delayed formation of expansive minerals within the material [31][32][33].…”

Section: Accelerated Curingmentioning

confidence: 99%

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Microwave processing of cement and concrete materials – towards an industrial reality?

Buttress

Jones

Kingman

2015

Cement and Concrete Research

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Each year a substantial body of literature is published on the use of microwaves to process cement and concrete materials. Yet to date, very few if any have lead the realisation of a commercial scale industrial system and is the context under which this review has been undertaken.The state-of the-art is evaluated for opportunities, and the key barriers to the development of new microwave-based processing techniques to enhance production, processing and recycling of cement and concrete materials. Applications reviewed include pyro-processing of cement clinker; accelerated curing, non-destructive testing and evaluation (NDT&E), and end-of-life processing including radionuclide decontamination.

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“…hours [30]. For steam curing, the advantages are also offset by durability issues associated with the delayed formation of expansive minerals within the material [31][32][33].…”

Section: Accelerated Curingmentioning

confidence: 99%

“…Leung and Pheeraphan [30] investigated accelerated curing of cement mortars and concrete specimens. It was found that, for all the mortar specimens, the seven day strengths were reduced compared to the control group.…”

Section: Accelerated Curingmentioning

confidence: 99%

Microwave processing of cement and concrete materials – towards an industrial reality?

Buttress

Jones

Kingman

2015

Cement and Concrete Research

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“…High early age strength development is often required of repairs to structures such as airport runways, bridge decks and car parks to minimise delays, disruption and financial loss to the users and owners of such structures. Accelerated curing, either by applying heat or using special repair formulations, is required since cementitious materials, under normal ambient curing, can take over 24 h to harden and several days to develop sufficient strength [4]. The heat curing methods used in current practice, such as open flame heaters, are unsuitable for modern construction.…”

Section: Introductionmentioning

confidence: 99%

“…The temperature can be controlled to provide optimum curing and minimise deleterious effects on hydration products and microcracking. It reduces setting time and increases early age strength of cement based repair materials [4,[8][9][10][11][12][13][14][15][16][17] thereby preventing disruption and delays by shortening the required curing time of patch repairs in concrete structures such as bridge decks and airport runways.…”

Section: Introductionmentioning

confidence: 99%

Bond between microwave cured repair and concrete substrate

2017

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The bond strength between a concrete substrate and repair patch is critical to its durability. This paper investigates the effect of microwave curing the freshly applied repair, for 45 min at 132 Watts, on the 28 day bond strength between substrate concrete and different commercial repair materials. The repairs were applied at different ambient temperatures of 20, 10, 2 and -5°C. Tensile split tests on repaired cube specimens were performed to determine the interfacial bond strength. The ability of microwave curing to prevent the detrimental effects of freezing at early age on the bond and compressive strength of repair patches is investigated. Experimental results show that microwave curing prevents loss of long term (28 day) repair/substrate bond strength of repair materials applied at freezing temperatures (-5°C), relative to the repairs applied at higher temperatures (2-20°C), except one lightweight repair formulation. In comparison, the control samples (non-microwave cured) of repairs applied at -5°C suffered severe loss of bond strength and compressive strength due to early age freezing. In addition, no adverse effects on the bond strength and a small reduction of 6.75% in the 28 day compressive strength are observed in the early age microwave cured repairs applied at ambient temperatures of 2-20°C. The repair/substrate bond strength is independent of the compressive strength of the repair material at all temperatures of repair application. Microwave curing can accelerate the concrete repair process and facilitate construction activity in cold weather.

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“…Further studies in the 1990s explored the concept of 'temperature feedback control' in order to improve the curing efficiency [3][4][5] . For the internal temperature measurement, a thermocouple with appropriate shielding was used in order to avoid 'sparking' caused by the electromagnetic interference on the metallic surface.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the accelerated curing process of concrete using a fibre Bragg grating-based control system and microwave technology

et al. 2016

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(2016). Optimization of the accelerated curing process of concrete using a fibre Bragg grating-based control system and microwave technology. Proceedings of SPIE, 9916, 99160P. doi: 10.1117/12.2236856 This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent ABSTRACTIn this paper, an investigation into the suitability of using fibre Bragg gratings (FBGs) for monitoring the accelerated curing process of concrete in a microwave heating environment is presented. In this approach, the temperature data provided by the FBGs are used to regulate automatically the microwave power so that a pre-defined temperature profile is maintained to optimize the curing process, achieving early strength values comparable to those of conventional heatcuring techniques but with significantly reduced energy consumption. The immunity of the FBGs to interference from the microwave radiation used ensures stable readings in the targeted environment, unlike conventional electronic sensor probes.

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Microwave curing of Portland cement concrete: experimental results and feasibility for practical applications

Cited by 85 publications

References 5 publications

Microwave processing of cement and concrete materials – towards an industrial reality?

Microwave processing of cement and concrete materials – towards an industrial reality?

Bond between microwave cured repair and concrete substrate

Optimization of the accelerated curing process of concrete using a fibre Bragg grating-based control system and microwave technology

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