Construction Technology and Methods
This domain tests how buildings and structures are built and why methods are chosen. Know the substructure-to-superstructure sequence: site clearance, excavation, foundations, ground slab or basement, frame, envelope, services, finishes. Understand foundation types-strip, pad, raft, and piles-and when each suits ground conditions and load. Know the difference between shallow and deep foundations.
Understand structural forms: load-bearing masonry, framed structures (steel and reinforced concrete), and their spanning behaviour. Know concrete basics: batching, placing, compaction, curing, and formwork; reinforcement provides tensile strength. Understand steel erection, connections, and fire protection. For the envelope, know cladding, insulation, damp-proof courses, and weatherproofing principles. Temporary works (scaffolding, formwork, excavation support) are part of method selection.
Traps: confusing raft (spreads load over weak ground) with piles (transfer load to deeper strata); assuming concrete gains strength instantly (curing matters); and ignoring buildability and sequencing when a method looks cheapest.
Rule of thumb: choose foundations from ground conditions and load-weak shallow soils favour rafts or piles; strong shallow soils favour strips and pads.
Worked example: A site has soft clay to 12 m over firm strata. A strip footing would settle excessively; a piled foundation transfers load to the firm layer, while a raft may suit moderate loads on improved ground. Method choice follows the ground profile.