Select the correct logical sequence for concrete works: (1) Erection of formwork → (2) Pouring of concrete → (3) Curing of concrete → (4) Removal of formwork.

Introduction / Context:
Concrete construction follows a strict sequence to ensure dimensional accuracy, surface quality, and structural performance. The network ordering affects safety and strength development.

Given Data / Assumptions:

• Activities: erection of formwork, pouring (placing) of concrete, curing, and removal (stripping) of formwork.
• Standard codes require adequate curing and safe stripping times.

Concept / Approach:
Formwork provides shape and support until concrete gains sufficient strength. After placing and compacting, concrete must be cured to retain moisture and promote hydration. Only after achieving the code-recommended strength and time can formwork be removed without damage.

Step-by-Step Solution:
1) Provide formwork first to contain fresh concrete: Erection of formwork.2) Place and compact concrete within the erected forms: Pouring of concrete.3) Maintain moisture/temperature to gain strength: Curing of concrete.4) Remove forms when safe and as per guidelines: Removal of formwork.

Verification / Alternative check:
Construction manuals specify stripping times (soffits, beams, slabs) depending on spans, cement type, and ambient conditions, confirming that removal follows adequate curing/strength gain.

Why Other Options Are Wrong:

• Option A/D: Pouring before erecting forms or curing before forms are in place is illogical.
• Option C: Removal cannot precede erection and placing; unsafe and impossible.

Common Pitfalls:

• Removing formwork too early, causing deflection, honeycombing, or cracking.
• Insufficient curing leading to low strength and surface defects.

Final Answer:
1. Erection of form work 2. Pouring of concrete 3. Curing of concrete 4. Removal of form work.