Microwave-assisted heating of cementitious materials: Relative dielectric properties, mechanical property, and experimental and numerical heat transfer characteristics

Makul, Natt; Keangin, P.; Rattanadecho, Phadungsak; Chatveera, Burachat; Agrawal, Dinesh Kumar

doi:10.1016/j.icheatmasstransfer.2010.06.029

Cited by 36 publications

(12 citation statements)

References 18 publications

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“…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]. In addition, the process can suffer from non-uniform hydration of the cement clinker, resulting from temperature gradients within the material due to inherent thermal insulation effects [34]. Providing the process is optimised for the material to be treated, microwave assisted curing of cement and concrete could yield benefits in terms of reductions in processing time; energy efficiencies and cost, in addition to increased material performance, particularly at early ages.…”

Section: Accelerated Curingmentioning

confidence: 99%

“…Makul and Agrawal [34] recently published work showed that the use of a Cober Electronics industrial microwave generator (2.45 GHz, 6.0kW) into a multimode applicator, resulted in specimens that exhibited increased strength over those cured under autoclaved and lime saturated conditions, particularly at early ages. Microstructural and compositional analysis did reveal differences in the cement specimens based on the applied curing regieme.…”

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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Section: Accelerated Curingmentioning

confidence: 99%

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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“…These are the key material characteristics that will govern their behaviour on application of the microwave energy [28][29][30]. Although conventionally TGA is used to identify chemical speciation due to loss of bound water and oxidisation with increasing temperature, here it was used to drive off the free water.…”

Section: Materials Property Characterisation (Tga and Dielectrics)mentioning

confidence: 99%

Understanding the scabbling of concrete using microwave energy

Buttress¹,

Jones²,

Dodds³

et al. 2015

Cement and Concrete Research

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This paper reports on the use of microwave energy to scabble concrete. While the technique is not new, little information exists relating to the controllability of the process, the effect of different types of concrete and the performance and durability of the scabbled concrete post treatment. Concrete blocks supplied by the UK Sellafield nuclear site were treated with microwave energy using a 15kW system, operating at 2.45GHz. The effect of aggregate type (Whinstone, Gravel and Limestone); standoff distance; and effect of surface coating were studied to determine their influence on the systems performance, in terms of mass and area removal rates.Complimentary modelling studies were undertaken relating the power density of the microwave energy to observed scabbling profile. Mass and area removal rates averaged 11.3gs -1 and 3cms -1 respectively on treating large areas to a depth of 25mm. The process was shown to not adversely affect structural properties of the specimens after treatment.

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“…The temperature rise of the processed cement paste under heating with microwave can be obtained by solving the heat-conduction transport equation included as a local electromagnetic heat-generation term [12]:…”

Section: Related Theoriesmentioning

confidence: 99%

Microwave curing at an operating frequency of 2.45GHz of Portland cement paste at early-stage using a multi-mode cavity: Experimental and numerical analysis on heat transfer characteristics

Makul

Rattanadecho

Agrawal

2010

International Communications in Heat and Mass Transfer

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Microwave-assisted heating of cementitious materials: Relative dielectric properties, mechanical property, and experimental and numerical heat transfer characteristics

Cited by 36 publications

References 18 publications

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

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

Understanding the scabbling of concrete using microwave energy

Microwave curing at an operating frequency of 2.45GHz of Portland cement paste at early-stage using a multi-mode cavity: Experimental and numerical analysis on heat transfer characteristics

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