1. ABESC – Associação Brasileira das Empresas de Serviços de Concretagem (Brazilian association of concrete suppliers), 2009. http://www.abesc.org.br, accessed on January (in Portuguese).
2. ABNT, 1982. NBR 7215: Measurement of Concrete Consistency by the Flow Table Method. ABNT-Brazilian Association for Technical Standards, São Paulo, Brazil.
3. ABNT, 1987. NBR 9778: Measurement of Water Absorption of Concretes. ABNT-Brazilian Association for Technical Standards, São Paulo, Brazil.
4. ABNT, 1994a. NBR 5738: Moulding and Cure of Concrete Cylindrical and Prismatic Test Pieces. ABNT-Brazilian Association for Technical Standards, Rio de Janeiro, Brazil.
5. ABNT, 1994b. NBR 5739: Measurement of Compressive Strength of Concrete. ABNT-Brazilian Association for Technical Standards, São Paulo, Brazil.