Concrete Mix Design Calculation for Compressive Strength of 3500 psi

What is the water-cement ratio for non-air-entrained Portland cement concrete with a compressive strength of 3500 psi?

The amount of water required for non-air-entrained Portland cement concrete with a specified compressive strength, f'c, of 3500 psi was 300 lbs./yd³. The cement (Type I) added was 560 lbs./yd³.

Answer:

The water-cement ratio (W/C ratio) for the given concrete mix is approximately 0.536.

When designing a concrete mix with a specified compressive strength of 3500 psi, it is crucial to determine the water-cement ratio (W/C ratio) accurately. In this case, the weight of water necessary for the mix is 300 lbs./yd³, while the weight of cement added is 560 lbs./yd³.

To calculate the water-cement ratio (W/C ratio), we simply divide the weight of water by the weight of cement. This calculation gives us a ratio of 0.536, which represents the W/C ratio for the given concrete mix.

Understanding and controlling the water-cement ratio is essential in achieving the desired strength, durability, and workability of concrete. A proper mix design ensures that the concrete performs well in its intended application and meets the specified requirements.