Project · Structural reinforcement · Barcelona

Reinforcing a reinforced concrete joist damaged by carbonation

Repair of a concrete joist whose reinforcement had lost cross-section through carbonation. The solution was to replace it functionally with an extendable galvanised steel beam: a precise, minimally invasive intervention.

Viga metálica extensible de acero galvanizado sustituyendo una vigueta de hormigón carbonatada

The galvanised steel beam takes over the role of the damaged joist.

€15,000

Construction budget
Structural intervention.

2014

Year
Commissioned by a residents’ association.

Steel

Galvanised
Extendable steel beam.

Minimal

Intervention
No major demolition.

The brief

A joist losing capacity

A residents’ association needed a reliable way to repair a concrete joist affected by carbonation. The defect had left the reinforcement unprotected to the point of losing cross-section.

Project data

  • Location: Coll del Portell street, Barcelona

  • Client: residents’ association

  • Year: 2014

  • Construction budget: €15,000

  • Architects: Kaitek

The solution

Functional replacement with a steel beam

Safety and durability without demolition.

Vigueta de hormigón armado afectada por carbonatación
Viga metálica extensible de acero galvanizado sustituyendo una vigueta de hormigón carbonatada
Detalle del apoyo de la viga metálica de refuerzo

Instead of demolishing and rebuilding the floor, an extendable galvanised steel beam was installed to take over the role of the damaged joist. It is a precise, quick and minimally invasive structural intervention that ensures safety and durability.

Frequently asked questions

Joist defects

A process through which concrete loses its ability to protect the steel. The reinforcement rusts, expands and loses cross-section, reducing the strength of the element.

Not always. It is often enough to reinforce it or replace it functionally with a steel section, as here.

Cracks along the joist, spalling of the concrete cover or rust stains are warning signs. A technical inspection will confirm it.

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