Uji Kuat Tekan Beton dengan Benda Uji Silinder (SNI 1974:2011)

Introduction

This tutorial provides a comprehensive guide to conducting a concrete compressive strength test using cylindrical test specimens, following the Indonesian National Standard (SNI 1974:2011). Understanding this testing method is crucial for ensuring the quality and durability of concrete used in construction projects.

Step 1: Prepare the Test Specimens

• Obtain Cylindrical Molds: Use standard cylindrical molds with a diameter of 15 cm and height of 30 cm.
• Mix Concrete: Prepare the concrete mix according to your project specifications. Ensure consistency in the mix for accurate results.
• Fill Molds: Pour the mixed concrete into the molds in multiple layers, each approximately one-third full. Use a rod to compact each layer to eliminate air bubbles.
• Surface Leveling: After filling, level the top surface of the concrete with a trowel to ensure a flat surface.

Step 2: Curing the Specimens

• Initial Curing: Cover the filled molds with a damp cloth to prevent moisture loss. Allow them to cure for 24 hours at room temperature.
• Demolding: After 24 hours, carefully remove the concrete specimens from the molds and place them in a curing tank or area.
• Long-term Curing: Keep the specimens submerged in water or cover them with wet burlap for at least 7 days to achieve optimal strength development.

Step 3: Testing the Compressive Strength

• Equipment Setup: Use a compression testing machine calibrated according to manufacturer specifications.
• Specimen Placement: Position the cured cylindrical specimen correctly in the machine. Ensure it is centered and stable to prevent any misalignment during the test.
• Conduct the Test: Gradually apply pressure until the specimen fails. Record the maximum load applied to the specimen before failure.

Step 4: Calculating Compressive Strength

Determine Cross-Sectional Area: Calculate the area of the cylindrical specimen using the formula

• Area = π * (radius)^2

Calculate Strength: The compressive strength (f'c) is calculated using the formula

• f'c = Maximum Load (N) / Area (mm²)
• Document Results: Record the compressive strength values and ensure they meet the required standards.

Conclusion

The concrete compressive strength test using cylindrical specimens is essential for verifying the quality of concrete. By following these steps, you can ensure accurate testing and reliable results. For further applications, consider exploring other testing methods or standards related to concrete performance to broaden your understanding of material quality assurance in construction.