1. British Standards Institution, 2022. BS EN 1097-6: 2022 Tests for mechanical and physical properties of aggregates. Determination of particle density and water absorption. https://www.bsigroup.com/.
2. British Standards Institution, 2006. BS EN 1936: 2006 Natural stone test methods - determination of real density and apparent density, and of total and open porosity. https://www.bsigroup.com/.
3. British Standards Institution, 2016. BS EN 13055:2016 Lightweight aggregates. https://www.bsigroup.com/.
4. Properties and microstructure of lightweight aggregate produced from sintered sewage sludge ash;Cheeseman;Resour., Conserv. Recycl.,2005
5. Recycling and recovery routes for incinerated sewage sludge ash (ISSA): a review;Donatello;Waste Manage.,2013