Same Mortar, Different Purpose? That’s Where Most Construction Problems Begin
Created on 01.27
1. Different Core Functions
Masonry Mortar
Used to bond bricks or blocks to form load-bearing or enclosure walls.
It functions as a structural bonding material, responsible for load transfer and overall stability.
Plastering Mortar
Applied to wall or substrate surfaces for leveling, protection, and decoration.
It serves as the building’s surface layer, providing a smooth and stable base for finishing materials.
2. Different Material Focus and Mix Design
Masonry Mortar:
- Emphasis on compressive strength and bonding strength (e.g. M5, M10)
- Coarser sand and higher sand content
- Designed for structural performance and durability
Plastering Mortar:
- Emphasis on workability, water retention, and crack resistance
- Finer sand for easier application and finishing
- Often modified with fibers or polymers
- Strength is secondary to application performance
3. Construction Methods and Thickness
Masonry Mortar:
- Joint thickness typically around 8–10 mm
- Applied by laying or squeezing mortar
- Requires full, dense joints
Plastering Mortar:
- Applied in layers (base coat, intermediate coat, finish coat)
- Layer thickness ranges from a few millimeters up to 20 mm
- Higher requirements for flatness and surface quality
4. Performance Priorities
- Masonry Mortar:
compressive strength, bonding strength, durability
- Plastering Mortar:
adhesion to substrate, crack resistance, water resistance, workability
Conclusion
- Masonry mortar
is for bonding and load-bearing
- Plastering mortar
is for surface leveling and protection
Understanding their intended function, not just strength grade, is essential for proper mortar selection.
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