Proportions
| Portland cement | 1 part |
|---|---|
| Hydrated lime | 0.5 parts |
| Sand | 4.5 parts |
| Typical strength | 1,800 psi · 12.4 MPa |
Mortar
Mortar mix ratio for concrete block
Concrete block, especially exterior or load-bearing, is usually laid in the stronger Type S mortar for better bond and compressive strength.
Recommended mix
1 : 0.5 : 4.5portland cement : hydrated lime : sand
Type S mortar — about 1,800 psi (12.4 MPa).
Planning reference. Typical proportions and strength for general work, not a structural mix design. Load-bearing and structural work must follow your local building code and a qualified engineer's specification.
Why this mix
A strong, versatile mortar (min 1,800 psi) with good bond and workability. The usual choice for exterior walls at or below grade and for structural brick/block.
Once you know the mix, the volume calculators tell you how much of it to buy — cubic yards, cubic metres and the bag count in every size.
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