Which of the following statements are wholly correct regarding broken-brick aggregate useable in concretes?
1. Broken-brick aggregate is obtained by crushing waste bricks, and it has a density varying between 1000 kg/m3 — 1200 kg/m3.
2. Such aggregate is used in concrete for the foundation in light buildings, floorings, and walkways.
3. Such aggregate may also be used in light-weight reinforced concrete floors.
1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3