Substituir a AREIA pelo PÓ DE PEDRA? Vale a pena?

Introduction

This tutorial provides a comprehensive guide on substituting sand with stone powder in concrete mixtures. The video discusses the advantages of using stone powder instead of traditional sand, including improved performance and cost-effectiveness. By following these steps, you can make informed choices for your construction projects.

Step 1: Understanding the Materials

To effectively replace sand with stone powder, familiarize yourself with the materials involved:

• Cement: Use a 50 kg bag of cement rated at 32 MPa.
• Stone Powder: Approximately 2.75 liters of stone powder.
• Gravel: About 4.00 liters of gravel (size 1).
• Water: 29 liters of water is required for mixing.

These materials will help achieve the desired concrete strength and workability.

Step 2: Calculate Concrete Strength

When substituting materials, it's important to understand the concrete's compressive strength:

• Fck: Target strength should be around 20 MPa.
• Fcm: The characteristic strength can reach up to 30 MPa with proper mixing.

This calculation ensures that the concrete meets structural requirements.

Step 3: Prepare the Mixture

Follow these steps to prepare your concrete mixture effectively:

1. Combine Materials: In a mixing container, combine the following in the specified ratios:

   • 1 bag of cement
   • 2.75 liters of stone powder
   • 4.00 liters of gravel
   • 29 liters of water

2. Mix Thoroughly: Use a concrete mixer or a sturdy mixing tool to ensure all materials are well incorporated. Aim for a uniform consistency.

3. Check Slump Test: Perform a slump test to achieve a slump of approximately 12 cm (+/- 2 cm). This test provides insight into the workability of the concrete.

Step 4: Assess Performance

Evaluate the mixed concrete's performance to ensure it meets your project requirements:

• Rendimiento: The mixture should yield around 115 liters of concrete.
• Strength Testing: Consider conducting strength tests on samples to confirm that the mixture meets the desired Fck and Fcm values.

Common Pitfalls to Avoid

• Incorrect Ratios: Ensure you follow the specified material ratios closely to avoid compromising the concrete's strength.
• Inadequate Mixing: Insufficient mixing can lead to weak spots in the concrete. Mix until uniform.
• Ignoring Water Content: Too much or too little water can affect the workability and strength of the concrete.

Conclusion

Substituting sand with stone powder can provide numerous advantages, including enhanced strength and cost savings. By understanding the materials, calculating the necessary strength, preparing the mixture correctly, and assessing its performance, you can successfully implement this method in your construction projects. For further exploration, consider reviewing academic works on this topic or consulting with professionals in the field.