Abstract
The experiment aims to test the specific way of producing concrete with recycled concrete aggregate (RCA). To reduce its negative impact on the concrete properties, two different ways of treatment of the RCA with geopolymer slurry were applied—coating during the mixing using the specific mixing approach and coating prior to the mixing of concrete. As control samples, a mixture prepared by natural aggregate only and a mixture with RCA that was prepared by standard mixing with no coating process were tested as well. The results of density, total water absorption, and compressive strength in periods of 28, 90, 180, and 365 days of curing are presented and evaluated. Both methods of coating of the RCA with geopolymer slurry allow for the preparation of concrete with properties comparable to those of normal concrete (prepared by standard mixing with natural aggregate); thus, it seems to be a promising way to enhance the rate of RCA application. The positive effect of coating is clearly visible after a longer period of curing (180 days). When comparing the methods of RCA coating, coating directly during the mixing yields somewhat better results; it is also positive from the technological point of view, since the process is simpler in practice.
Highlights
Waste represents a huge loss of resources when it is not used in the form of materials and energy, it can endanger the environment if it is misapplied
Both methods of coating of the recycled concrete aggregate (RCA) with geopolymer slurry allow for the preparation of concrete with properties comparable to those of normal concrete; it seems to be a promising way to enhance the rate of RCA application
B0, prepared with only natural aggregates, ranging from kg/m lower density values of B1–B3 samples are due to the substitution of natural aggregate by RCA
Summary
Waste represents a huge loss of resources when it is not used in the form of materials and energy, it can endanger the environment if it is misapplied. Up to one-third of the total municipal waste in Europe will end up in landfills, which occupy space and can cause air, water, and soil pollution. On the other hand, recycling and waste recovery comprise a key tool for protecting the environment, ensuring the efficient use of natural resources, increasing employment in the waste management sector, and combating climate change. The European Union’s goal is to reduce the amount of waste that ends up in landfills and to make production processes more efficient by lowering the use of primary resources and reducing the emitting substances [3,4]
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