Which action best supports maintaining slump and strength during production?

• A. Using more cement than required.
• B. Pouring when the concrete is too hot.
• C. Ignoring slump readings.
• D. Regularly calibrating water addition equipment to maintain the correct water-to-cement ratio and sustain slump and strength.

Answer: (D)

Maintaining slump and strength hinges on controlling the water-to-cement ratio. The amount of water added to the mix sets the workability (slump) and, at the same time, influences the achievable compressive strength after curing. Regularly calibrating the water addition equipment keeps the actual water meeting the design target, preventing drift from pumps, scales, or temperature changes. When the water content stays on target, the slump remains consistent and the strength stays within spec, which is essential for proper placement, finishing, and durability. Other practices—adding extra cement, pouring when the mix is too hot, or ignoring slump readings—disrupt the balance between workability and strength, leading to inconsistent performance and potential waste.