Created: 2024/10/01 20:10

Experiment no. 05

Experiment name: Determination of compressive strength of concrete

Objective

The objective of this experiment is to,

1. Determine the compressive strength of cement concrete specimen.

Significance

Compressive strength is one of the most critical parameter in evaluating concrete quality because,

1. It determines load-bearing capacity.
2. Directly affects stability and safety of structures.
3. Helps to determine when concrete reaches its optimal strength.
4. Provide guides for engineers in selecting the appropriate concrete mix for specific construction needs.

Apparatus

1. Compression testing machine
2. Cylindrical molds
3. Weighing scale
4. Slump cone
5. Tampering rod, vibrator
6. Timer

Data sheet

Result

The average compressive strength of the cement concrete was determined to be 2304.17 psi at the 3rd, 2290.16 psi at the 7th, and 3941.50 psi at the 28th days.

Discussion

The concrete mix tested in this experiment showed compressive strengths of 2304.17 psi, 2290.16 psi, and 3941.50 psi at the 3rd, 7th, and 28th days respectively. There is a significant increase in strength from 7 to 28 days. This is when the concrete reached its expected load-bearing capacity. And the almost similar strength at 3rd and 7th days indicate that the concrete may have reached early strength quickly, but reached its full strength only after proper curing over time.

The determined strength of 3941.50 psi at 28 days falls within the range suitable for general-purpose constructions, such as residential buildings. This strength level indicates good durability and can withstand typical loading conditions. However, for projects requiring higher strength, such as high-rise buildings, a mix design with higher compressive strength would be required.