Building materials such as stone aggregates and sand.The demand for construction materials increases daily all over the world. The construction industry accounts directly and indirectly for nearly 40% of the material flow entering the world economy (Roodman and Lenssen, 1995) and in developing countries for around 50% of the total energy consumption (Levin, 1997; Bonini and Hanna, 1997). Tanzania faces the same pattern.
Stone aggregates are produced based on following sizes for concrete
production:
- 0 – 3 mm
- 3 – 6 mm
- 6 – 10 mm
- 10 – 14 mm
- 14 – 20 mm
- 20 -40 mm
- Or also produce specific size
on demand for Asphalt and road construction.