Effect of treatment types of recycled concrete aggregates on the properties of concrete
Liudmyla Trykoz
lvtrikoz@ukr.netBuilding Materials, Constructions and Structures Department; Ukrainian State University of Railway Transport; (Ukraine)
https://orcid.org/0000-0002-8531-7546
Oleksii Zinchenko
Building Materials, Constructions and Structures Department; Ukrainian State University of Railway Transport; (Ukraine)
https://orcid.org/0009-0000-3858-8258
Dmytro Borodin
Machine Components and Hydropneumatic Systems Department; National Technical University “Kharkiv Polytechnic Institute”; (Ukraine)
https://orcid.org/0000-0002-2105-023X
Svitlana Kamchatna
Higher Mathematics and Physics Department; Ukrainian State University of Railway Transport; (Ukraine)
https://orcid.org/0000-0001-5711-4146
Oksana Pustovoitova
Building Construction Department; O. M. Beketov National University of Urban Economy; (Ukraine)
https://orcid.org/0009-0003-4774-6686
Abstract
Reusing waste materials such as construction and demolition waste is an environmentally significant task. This article aims to improve the quality of recycled aggregates after the demolition of concrete structures. Two methods, mechanical cleaning and impregnation, were explored to enhance the quality of coarse aggregates. The findings indicate that mechanical cleaning is more effective than soaking in a sodium silicate solution. The compressive strength of concrete made with mechanically cleaned recycled aggregates was 2.3 times greater than that of concrete made with untreated rubble. Concrete with impregnated rubble had a compressive strength 1.1 times greater than that of concrete with untreated aggregates. Infrared spectroscopy was used to study the microstructure, revealing that the type of treatment does not influence the quantity of portlandite and ettringite in hydrated cement. However, the treatment of recycled aggregates alters the interaction in the gel portion of cement hydration products. Concrete with aggregates treated by sodium silicate has more aluminate components. Additionally, there is a shift of the bands assigned to Si-O stretching to higher wave numbers (from 995 cm–1 to 1088 cm–1), which can be attributed to the formation of calcium-silicate-hydrate gel with a lower calcium/silicon ratio.
Keywords:
recycled aggregate, concrete, average density, compressive strength, FTIR spectroscopyReferences
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Authors
Liudmyla Trykozlvtrikoz@ukr.net
Building Materials, Constructions and Structures Department; Ukrainian State University of Railway Transport; Ukraine
https://orcid.org/0000-0002-8531-7546
Authors
Oleksii ZinchenkoBuilding Materials, Constructions and Structures Department; Ukrainian State University of Railway Transport; Ukraine
https://orcid.org/0009-0000-3858-8258
Authors
Dmytro BorodinMachine Components and Hydropneumatic Systems Department; National Technical University “Kharkiv Polytechnic Institute”; Ukraine
https://orcid.org/0000-0002-2105-023X
Authors
Svitlana KamchatnaHigher Mathematics and Physics Department; Ukrainian State University of Railway Transport; Ukraine
https://orcid.org/0000-0001-5711-4146
Authors
Oksana PustovoitovaBuilding Construction Department; O. M. Beketov National University of Urban Economy; Ukraine
https://orcid.org/0009-0003-4774-6686
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