Concrete screeding is a hands-on process involving the application of a well-mixed blend of ordinary Portland cement, fine aggregates (sand), and water. This mixture hydrates to form a solid, level sub-floor, providing a sturdy base for the final floor finish. Let’s delve into the details of mix proportions, application methods, finishes, advantages, and disadvantages of concrete screed.
Concrete is composed of cement, aggregates, and water, with proportions tailored for specific strength and application requirements. In the case of concrete screed, the mix varies: one part cement to three to five parts sand. For heavy-duty screed, the mix adjusts to one part cement, three parts 0-4mm sand, and one part 6-10mm single-sized aggregates.
| Mix Component | Regular Screed | Heavy Duty Screed |
|---|---|---|
| Cement | 1 part | 1 part |
| Sand (0-4mm) | 3-5 parts | 3 parts |
| Aggregates (6-10mm) | Not applicable | 1 part |
Mixing: Thoroughly blend cement, sand, and water according to requirements.
Pouring and Spreading: Pour the mixture onto the concrete base and evenly spread it with a trowel to achieve the desired thickness (25mm to 35mm).
Finishing: Provide a smooth surface finish based on the intended use.
Drying: Allow the screed to dry, similar to conventional concrete.
Curing: After drying, perform proper curing for optimal strength.
Screed in construction refers to a flat board used to achieve a smooth finish on the concrete mix. Various finishes, from extremely smooth to coarse, are possible, depending on the intended use.
Leveled Surface: Provides a flat surface for flooring.
Strength: Rigid and capable of withstanding footfall loads.
Simplicity: Application is not overly complex, reducing the need for highly skilled workers.
Accessible Materials: Uses easily available materials like cement, sand, and water.
Height Adjustment: Provides a sufficient height to the flooring.
Consistency: Mixture consistency crucial; improper consistency may impact load resistance.
Thorough Mixing: All ingredients must be well-mixed to maintain concrete strength.
Curing Importance: Inadequate curing affects strength and abrasive resistance.
In conclusion, concrete screeding is a practical method with distinct advantages and considerations. Understanding its application and characteristics ensures successful flooring projects.
