1. Bureau of Normalization. (2013). Tests for mechanical and physical properties of aggregates – Part 6: Determination of particle density and water absorption (NBN EN 1097-6:2013). https://www.nbn.be/.
2. American Society for Testing and Materials. (2015). Standard Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate (ASTM C127-15). https://www.astm.org/.
3. Sustainable construction materials: Recycled aggregates;Dhir,2019
4. Concrete Aggregates;Sims,2019
5. Bureau of Normalization. (2021). Concrete – Specification, performance, production and conformity (NBN EN 206:2013+A2:2021). https://www.nbn.be/.