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Project solutions

Road / highway / airport

Concrete pavements, runways and aprons need durable, workable concrete, good curing in the heat and sealed joints. Dowels, signs and barriers need reliable anchoring.

Concrete runway or highway in perspective with a plane overhead, the joints across the pavement shown in orange

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Solutions in build order

What this project needs, step by step

Truck mixer with an admixture dose discharging into a concrete pump that pipes the mix up to an upper floor slab High-performance ready-mix concrete Ready-mix plants supplying high-strength, pumped or long-haul concrete need a superplasticiser that holds slump, cuts water and works with GGBS, fly ash or microsilica. Durability admixtures cover corrosion and air entrainment where the specification asks for them. 6 steps Concrete slab poured under a hot sun from a chute, with an admixture drop and a curing spray coating the finished part Hot-weather concreting In a Pakistani summer, concrete loses slump in the truck, sets before it is finished and cracks if it dries early. Use a hot-climate superplasticiser or retarder, pour in the cooler hours and start curing straight away. 6 steps Low-pressure sprayer coating a fresh concrete slab with curing compound while water evaporates from the uncoated part Concrete curing Curing keeps water in young concrete so it gains strength and does not crack or dust. In Pakistan's heat and dry wind it must start within minutes of finishing, by wet curing or a sprayed curing compound. 7 steps Floor joint with steel edge angles and orange sealant over a foam rod, and a heavy wheel rolling towards it Floor joints in car parks, warehouses and roads Saw-cut, expansion and connection joints in floors that carry people, cars, forklifts or trucks. The sealant must take both traffic and movement, and the joint must be sized for it. 6 steps Two concrete slabs on columns with a gap between them sealed with orange sealant over a round foam rod Building expansion and movement joints The gaps between building blocks, slabs, walls and roofs that let the structure expand, shrink and settle. They need a sealant or tape matched to the movement, a correctly sized joint and a backer rod, or water gets in and edges break. 7 steps Existing concrete with resin-filled drilled holes holding new steel bars and a threaded rod fixing a steel plate. Chemical anchors, rebar & dowels Chemical anchors fix bolts, threaded rods and new reinforcement bars into existing concrete or masonry for extensions, railings, machines and services. Load capacity depends on the design, hole cleaning and base material, so safety-critical work needs an engineer. 7 steps Concrete beam with a square cut-out repair: cleaned steel bars coated, and repair mortar being trowelled in flush. Spalling concrete (chhajja, balcony, beam, column) Concrete that cracks, bulges and falls away, usually with rusty steel behind it, on chhajjas, balcony slabs, beams, columns and tank slabs. This guide follows the EN 1504 sequence: remove, protect the steel, rebuild, seal and protect. 7 steps