Agglomeration 1 Aggregates 1 Cements 1 Coarse aggregates 1 Compression testing 1 Compressive strength 1 Concrete aggregates 1 Concrete industry 1 Concrete mixtures 1 Concretes 1 Controlled low strength materials 1 Design approaches 1 Environmental engineering 1 Environmental problems 1 Fine aggregates 1 Mixture proportioning Natural resources 1 Paper sludge ash 1 Recycled aggregate concrete 1 Recycling 1 Strength of materials 1 Sustainable development 1 Waste paper 1