Experimental research on development of heated form incorporating exothermic reaction powder to protect concrete in cold weather

•New-type heating sheet developed to heat form in sub-zero conditions.•Heat generated through reaction between quicklime and water in mortar.•Compressive strength of mortar increased by using developed heating sheet.•Degree of heating can be adjusted according to quicklime amount. Concrete cast at l...

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Bibliographic Details
Published in:Construction & building materials 2017-03, Vol.135, p.30-36
Main Authors: Choi, Si-Hyun, Lee, Han-Seung, Choi, Hyun-Kuk, Kim, Hyeong-chul, Min, Tae-Beom, Ismail, Mohamed A.
Format: Article
Language:English
Subjects:
Analysis
Calcium oxides
Compressive strength
Concretes
Form
Heating sheet
Low-temperature construction
Mechanical properties
Quicklime
Thermal properties
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Summary:•New-type heating sheet developed to heat form in sub-zero conditions.•Heat generated through reaction between quicklime and water in mortar.•Compressive strength of mortar increased by using developed heating sheet.•Degree of heating can be adjusted according to quicklime amount. Concrete cast at low temperatures can have an adverse effect on the concrete quality owing to both a delay in the hydration reaction of the concrete and the occurrence of early frost damage. Therefore, a heating sheet was developed, which exploited the exothermic reaction between quicklime and water. A form with the heating sheet attached experienced a temperature rise and had a high compressive strength. TG-DTA analysis confirmed that a larger amount of the Ca(OH)2 hydration product was generated in the form with the heating sheet attached, while SEM analysis visually confirmed the size and shape of the hydration product.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2016.12.136