1. ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR NM 45: Aggregates – Determination of the unit weight and air-void contents. Rio de Janeiro, 2006. (in Portuguese).
2. ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS NBR NM 46: Aggregates – Determination of material finer than 75um sieve by washing. Rio de Janeiro, 2003. (in Portuguese).
3. ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS NBR NM 52: Fine aggregate – Determination of the bulk specific gravity and apparent specific gravity. Rio de Janeiro, 2009. (in Portuguese).
4. ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS NBR NM 67: Concrete – Slump test for determination of the consistency. Rio de Janeiro, 1998. (in Portuguese).
5. ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS NBR NM 248: Aggregates – Sieve analysis of fine and coarse aggregates. Rio de Janeiro, 2003. (in Portuguese).