The primary difference between cement mortar and cement plaster lies in their intended use and application, although both are made from similar materials.
Plaster is used to render the inside and outside of the walls to provide a smoother finish to the wall surfaces. This application focuses on creating an aesthetically pleasing and protective layer on vertical surfaces.
Mortar is a paste used in masonry to join bricks, stones and concrete blocks. Its main purpose is to bind individual masonry units together, providing structural integrity to walls and other structures.
Composition
Despite their different uses, both cement plaster and cement mortar share a common base composition.
- Both plaster and mortar are made by mixing cement and sand.
- The key difference in composition usually lies in the ratio of cement to sand, the type of sand used, and potentially the addition of other materials (though the provided reference only mentions cement and sand). Mortar for structural bonding typically requires a stronger mix than plaster used for finishing.
Uses and Applications
Understanding how each material is applied further clarifies their distinction.
- Cement Plaster:
- Applied to walls (internal and external) and sometimes ceilings.
- Creates a smooth or textured finish.
- Provides a protective layer against weather (external walls) and improves fire resistance.
- Prepares surfaces for painting or other decorative finishes.
- Cement Mortar:
- Used as a binding agent between masonry units like bricks, stones, or concrete blocks.
- Fills the gaps (joints) between units.
- Provides stability and strength to the overall structure.
- Also used for bedding foundation materials.
Key Differences Summarized
Here is a quick comparison of cement mortar and cement plaster:
| Feature | Cement Mortar | Cement Plaster |
|---|---|---|
| Main Use | Joining masonry units (bricks, blocks) | Finishing wall surfaces (smoothness) |
| Application | As a paste between building blocks | As a render on wall surfaces |
| Purpose | Structural bonding, filling joints | Surface smoothing, protection |
| Location | Between masonry units | On the surface of walls/ceilings |
| Composition | Made of cement and sand | Made of cement and sand |
In essence, mortar is the 'glue' that holds masonry structures together, while plaster is the 'skin' that covers and finishes the surfaces. Both are crucial in construction but serve distinct functions.
