According to standard productivity norms, what is the expected daily out-turn of cement concrete 1:2:4 (nominal mix) placed by one mason under ordinary site conditions?

Introduction / Context:
Out-turn norms guide planning and scheduling for concrete works. They depend on mixing method, transport distance, placing constraints, and finishing. For nominal mixes such as 1:2:4, exam-standard planning values are used to avoid over- or under-allocation of labour.

Given Data / Assumptions:

• Cement concrete nominal mix 1:2:4.
• One mason assisted by helpers under normal conditions.
• Non-mechanized or basic mechanized handling with typical haul distances.

Concept / Approach:
Published handbooks and SOR references typically place daily mason output for 1:2:4 concrete around 2.0–3.0 m^3, with 2.5 m^3 as a widely accepted central value for planning. Higher figures assume better mechanization and ideal logistics; lower figures reflect constraints or complex formwork.

Step-by-Step Solution:
Identify the typical range for manual/semimanual concrete placement.Select a median planning benchmark: 2.5 m^3 per mason per day.Confirm that this value aligns with many question banks and schedule norms.

Verification / Alternative check:
Cross-checking references shows 2–3 m^3 as common; 2.5 m^3 is therefore a reasonable expected out-turn for exam purposes.

Why Other Options Are Wrong:

• 1.5 m^3 or 1.0 m^3: Too conservative for normal conditions.
• 3.5 m^3 or 5.0 m^3: Optimistic unless highly mechanized or exceptionally favourable conditions exist.

Common Pitfalls:
Ignoring delays due to formwork or reinforcement congestion; not considering transport distances or vibration/finishing time.

Final Answer:
2.5 m^3