Report on Compression Testing of Concrete Cube under “Fix-it” day

Date:27 Feb 2025

Concrete Cube Compression Test Report

1. Introduction

Compression testing of concrete cubes is a fundamental procedure in civil engineering to assess the compressive strength of concrete. It is typically conducted to ensure that concrete used in construction meets the required structural strength criteria.

2. Objective

The main objective of the test is to determine the compressive strength of concrete by applying axial load on a cube specimen until failure.

3. Apparatus and Materials

• Concrete cube specimens (standard size: 150 mm × 150 mm × 150 mm)
• Compression testing machine
• Caliper or measuring tape
• Weighing balance
• Curing tank

4. Procedure

1. Cast concrete cubes and allow them to cure for 7, 14, or 28 days in water.
2. After curing, remove the cube from the water and allow it to surface dry.
3. Measure and record the dimensions of the cube.
4. Place the cube centrally in the compression testing machine.
5. Apply load gradually at a constant rate until the cube fails.
6. Record the maximum load at failure.

5. Calculation

Compressive Strength (MPa) = Maximum Load (N) / Cross-Sectional Area (mm²)

6. Results

Example values for M25 concrete:

• Maximum Load: 625 kN
• Cross-Sectional Area: 150 mm × 150 mm = 22,500 mm²
• Compressive Strength = 625,000 N / 22,500 mm² = 27.78 MPa

7. Conclusion

The concrete cube passed the required compressive strength criteria (25 MPa for M25 grade), indicating that the mix and curing process were adequate. Regular compression testing is essential for ensuring quality control in construction projects.