Construction Techniques and Site Organization
Construction Techniques and Site Organization tests the sequence and control of site work: layout, excavation, foundations, scaffolding, formwork, concreting, curing, storage, labour deployment, progress records and coordination. Questions often test method statements, plant choice and quality checks.
Site sequence and control
- Setting out: transfer grid lines and levels from drawings; protect benchmarks and reference pillars.
- Excavation: provide sloping or shoring for safety; keep spoil away from trench edges; dewater where needed.
- Foundation and superstructure: check bearing stratum, reinforcement cover and formwork alignment before concreting.
- Concreting: use a designed or nominal mix, place in layers, vibrate properly and cure for the specified period.
- Site organisation: locate stores, batching areas, scaffolding, access routes and safety equipment to minimise double handling.
Worked example
For 1 m³ of wet M20 nominal concrete (1:1.5:3), use a dry-volume factor of 1.54. Total mix parts = 1 + 1.5 + 3 = 5.5. Cement volume = 1.54 × 1 / 5.5 = 0.28 m³. At 0.035 m³ per 50 kg bag, cement = 0.28 / 0.035 = 8 bags. Sand = 1.54 × 1.5 / 5.5 = 0.42 m³; coarse aggregate = 1.54 × 3 / 5.5 = 0.84 m³.
Traps
Do not use wet volume directly for batching; do not remove formwork before the specified strength is reached; do not store cement on the ground; and do not allow excavated spoil to surcharge trench sides.