Concrete workability and slump — identify the correct relationship Which of the following statements about segregation, consistency, and slump is correct regarding fresh concrete workability?

Introduction / Context:
Workability is the umbrella term covering consistency, cohesion, mobility, and compactibility of fresh concrete. Field indicators such as the slump test provide a quick measure of consistency, which correlates positively (within limits) with workability for a given mix design.

Given Data / Assumptions:

• Standard slump test conditions and typical structural concrete mixes.
• Segregation is undesirable; cohesive mixes are targeted.
• “Dry” mix implies low water content/high stiffness.

Concept / Approach:
Segregation is the separation of coarse aggregate from mortar/paste and is harmful, not a prerequisite for workability. Consistency (wetness or flow) is a component of workability; increasing slump (to a reasonable extent) generally indicates higher consistency and improved ease of placement. Conversely, very dry mixes have low slump, not maximum slump. Thus, all four statements (a–d) are incorrect, making “None of these” the correct choice.

Step-by-Step Solution:

Verification / Alternative check:
Site control charts routinely correlate target slump ranges with placement method (pump, tremie, vibration) precisely because consistency affects workability.

Why Other Options Are Wrong:

• (a–d) each contradicts accepted definitions and field experience regarding fresh concrete behaviour.

Common Pitfalls:
Assuming more water always improves quality; while higher slump can aid placement, excessive water increases w/c ratio and harms strength/durability if not controlled with admixtures.

Final Answer:
None of these