Concrete workability — factors that significantly influence it Which of the following factors affect the workability (ease of mixing, placing, compacting, and finishing) of concrete?

Introduction / Context:Workability is a composite property reflecting consistency, cohesion, mobility, and compactability. It determines whether a mix can be placed and consolidated to achieve strength and durability with the available equipment and detailing.

Given Data / Assumptions:

• Conventional Portland-cement concrete.
• No drastic temperature extremes or special placing methods unless indicated.
• We assess primary factors influencing workability.

Concept / Approach:Higher water content (and warmer water up to reasonable limits) increases fluidity; aggregate shape/size and surface texture alter internal friction and paste demand; well-graded aggregates reduce voids and paste demand; air entrainment improves cohesion and flow while reducing bleeding/segregation. Hence, multiple factors jointly affect workability.

Step-by-Step Solution:

Verification / Alternative check:Slump and compaction-factor tests shift predictably with changes in water, grading, and air content, confirming these effects.

Why Other Options Are Wrong:

• Any single choice omits other equally important influences on workability.

Common Pitfalls:Correcting poor workability solely by adding water instead of optimizing aggregate grading or using admixtures.

Final Answer:All of the above