N˚

Sand

Gravel

Cement

Formulation

1

White quarry sand of Djiri

Crushed gravel of Kombé

・ G₁ (3.15/16)

・ G₂ (12.5/25)

CEM II 42.5

Formulation

2

Djiri white sand

Crushed gravel

・ 50% mixture of G₁ (3.15/16)

・ 50% of G₂ (12.5/25).

CEM II 42.5

Formulation

3

Red sand from the Congo River collected in Brazzaville

Crushed gravel

・ G₁+G₂ (5/25).

CEM II 42.5

Formulation

4

Djiri white sand + crushed 0/4 Kombé enhanced sand (taking 70% of Djiri’s white sand and 30% of crushed sand 0/4)

Crushed gravel

・ G₁ (3.15/16)

・ G₂ (12.5/25).

CEM II 42.5

Formulation

5

Red sand from the Congo River + crushed sand 0/4 (70% Congo River sand and 30% crushed 0/4 sand)

Crushed gravel

・ G₁ (3.15/16)

・ G₂ (12.5/25).

CEM II 42.5

Formulation

6

Crushed sand 0/5

Crushed gravel

G₁ (3.15/16) and G₂ (12.5/25).

CEM II 42.5