Concrete Work – Projects and Qualified Teams

Concrete work forms the structural skeleton of modern buildings: foundation slabs, strip and pad foundations, walls, columns, ceilings, stairs, and exposed concrete surfaces. The trade covers formwork, reinforcement placement, concreting, compaction, and curing. Correct concrete grade (strength class C25/30 to C50/60, exposure class XC, XD, XF for the environment), properly placed reinforcement with adequate cover, proper compaction with internal or external vibrators, and sufficient curing against shrinkage cracks are essential. Example Germany: design per DIN EN 1992 (Eurocode 2), execution per DIN 1045 and VOB/C DIN 18331. Reinforced concrete work requires chamber-of-crafts registration.

FAQ

How much does concrete work cost per m³ as subcontracted work?

Which concrete grade for which use?

Which reinforcement is standard?

Which curing is mandatory?

What are the most common defects?

How long does a 100 m² foundation slab take?

How much does concrete work cost per m³ as subcontracted work?: Example Germany: foundation slab 200–350 €/m³ incl. formwork, reinforcement, concrete, placement. Strip foundation 250–400 €/m³. Reinforced concrete wall 350–550 €/m³. Exposed concrete slab 450–700 €/m³ with stricter formwork and surface requirements. In Poland typically 30–40 % below German rates.
Which concrete grade for which use?: Example Germany: blinding C12/15. Slab unheated C20/25 XC2. Slab heated C25/30 XC1. External wall in contact with ground C25/30 XC2/XF1. Internal load-bearing elements C30/37. Exposed concrete SB1–SB4 by spec, higher class = tighter tolerances.
Which reinforcement is standard?: B500B reinforcing steel as standard in Germany. Slab: Q257A mesh top and bottom, plus added bars under walls and columns. Walls: mesh on both faces or bar reinforcement. Columns and beams: bar reinforcement with stirrups per design. Cover 25–50 mm by exposure class.
Which curing is mandatory?: Example Germany: per DIN 1045-3 at least 3–7 days curing against drying – keep moist, foil cover, or curing compound. Shorter only for high-performance concrete with high binder content. Missing curing leads to shrinkage cracks and strength loss.
What are the most common defects?: Cracks from missing curing, honeycombing from poor compaction, insufficient cover with corrosion consequences, wrong rebar placement, voids on the visible face from unsuitable formwork, joint offsets across storeys.
How long does a 100 m² foundation slab take?: Example: slab 100 m², 25 cm thick, with strip footings, mesh, C25/30: formwork 1–2 days, reinforcement 1 day, concrete pour 0.5 day, plus 28 days cure to full strength (loadable with masonry after 7 days). 4–5 working days of labour total.

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