PCI Level I and II Certification Practice Test 2025 – The All-In-One Guide to Master Your Certification!

To determine the water to cement ratio, you need to calculate the total weight of cement in the mix and then divide the weight of water by this total weight. In this specific scenario, the total weight of cement includes both the cement and the fly ash, as both contribute to the binding properties of the concrete.

The total weight of the cementitious materials is the sum of the weight of the cement and the weight of the fly ash:

- Cement: 725 lb

- Fly ash: 80 lb

Adding these together gives you:

725 lb (cement) + 80 lb (fly ash) = 805 lb of total cementitious material.

Now, you take the weight of water, which is 285 lb, and divide it by the total weight of the cementitious materials (805 lb):

Water to cement ratio = Weight of water / Total cementitious weight

= 285 lb / 805 lb = 0.3531, which is approximately 0.35 when rounded to two decimal places.

Considering the choices provided, the closest value to the calculated ratio is 0.35, which matches the second option. Therefore, while the computations imply a figure detailed closer to the second choice, the question context may lead one