Masonry Systems - Theory & Concepts

Concrete Hollow Blocks (CHB), mortar, grout, and structural masonry design.

Adjust block unit strength and mortar strength to estimate specified compressive strength ( $f'_m$ ) of the masonry prism.

Unit Compressive Strength (

f'_{cb}

)15 MPa

Standard CMU (5)High Strength (30)

Mortar Strength (

f_{mortar}

)10 MPa

Type O (2)Type M (20)

ASTM C1314: Compressive strength of masonry prisms is used to verify design compliance rather than testing individual components in isolation.

Block (15 MPa)

Good compatibility

f'_m = 0.7 \cdot (f'_{cb})^{0.75} \cdot (f_{mortar})^{0.25}

f'_m = 0.7 \cdot (15)^{0.75} \cdot (10)^{0.25}

f'_m \approx 9.5 \text{ MPa}

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