1. ABNT (1986) Soil—compaction test [Ensaio de compactação]. Brazilian Technical Standards Assoc, NBR 7182, Rio de Janeiro, Brasil (in Portuguese)
2. ABNT (2000) Soil—determining the permeability coefficient of clay soils and variable load [Determinação do coeficiente de permeabilidade de solos argilosos e de carga variável]. Brazilian Technical Standards Assoc, NBR 14545, Rio de Janeiro, Brasil (in Portuguese)
3. ABNT (2016a) Soil—grain size analysis[Análise granulométrica]. Brazilian Technical Standards Assoc, NBR 7181, Rio de Janeiro, Brasil (in Portuguese)
4. ABNT (2016b) Soil—determining the liquid limit [Determinação do limite de liquidade]. Brazilian Technical Standards Assoc, NBR 6459, Rio de Janeiro, Brasil (in Portuguese)
5. ABNT (2016c) Soil—determining the plastic limit [Determinação do limite de plasticidade]. Brazilian Technical Standards Assoc, NBR 7180, Rio de Janeiro, Brasil (in Portuguese)