Characterization of recycled aggregates to obtain concretes for common application
DOI:
https://doi.org/10.32347/tit.2024.7.2.01.03Keywords:
concrete, recycling, demolition waste, cement, characterization, aggregatesAbstract
Abstract. The article is devoted to the study of possibility to use demolition wastes as an aggregate to create new effective concrete constructions.
It had been shown that artificial aggregates from demolition wastes, especially from military origin, are very various and complicated in their composition.
All demolition wastes are characterized by weak and damage structure. There are a lot of damages and cracks are present in the aggregates, lowering their service properties and properties of concretes on their basis. Moreover, such aggregates appeared from the war reasons also are containing a lot of additional problems such as rests of organic compounds, unburned particles form the fire and explosion, etc.
It was shown that such kind of demolition wastes contain a lot of fine particles, influencing in a bad way on water consumption of the concrete mix. Also powder-like particles influence bad on service properties of concrete as well as on water to cement ratio in the concrete mix.
However, it was proved that beside of negative influence of aggregates from demolition wastes on concrete properties, it is still possible to obtain concrete mixes and concretes on their bases able to be used as a common concrete.
The best results are obtained using slag alkali activated cement. Compressive strength up to 32 MPa at 28 days is comparable to compressive strength of the control composition using OPC and traditional granite aggregate – 34 MPa at the age of 28 days of normal hardening. Use of slag OPC and recycled aggregates leads to the low compressive strength – up to 24 MPa at the age of 28 days.
Also, it should be mentioned that all concretes under study were characterized by low flexural strength, proving necessarity to provide further mix design to increase strength properties of concrete on recycled aggregates basis.
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