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Reinforced aerated autoclaved concrete planks found on pitched roof of 1990s hospital building

A building constructed in the early 1990s has been found to contain reinforced aerated autoclaved concrete (RAAC) planks. This date is important since it is much later than the previously thought last significant use of RAAC in buildings in the UK and potentially affects the scope of buildings that could require screening for RAAC problems.

Precast concrete panel fixing

A 1960s flyover was being demolished and an interesting feature came to light how the precast concrete edge panels were fixed.

Failure of prestressed hollowcore units during storage and transport

A reporter shares their experience of the failure of prestressed hollowcore units during storage and transport.

Failure of cast-in wire lifting loops on manhole cover slabs

A cast-in wire lifting loop failed when lifting a 4m diameter precast manhole cover slab into place.

Channel slab roof deck collapse during reroofing

This report highlights the structural risk caused by machinery during reroof a project.

Roof collapse of warehouse structure under rainwater ponding

This report highlights the structural risk caused by rainwater ponding on relatively flat roofs.

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Grouting of joints between load-bearing prefabricated concrete members

This report highlights the risk of failure if grouted joints between load-bearing prefabricated concrete members are not designed and installed correctly.

The use of cast-in ferrules as structural connections

This report highlights several problems that can arise with structural connections between elements when cast-in ferrules (also known as threaded inserts) are used for the anchorage of reinforcing bars.

Lessons learned from the 2018 Florida bridge collapse during construction

This was a bridge of an unusual design and was being constructed in an unusual manner. The main 53m pre-stressed pre-cast concrete span truss was in position when cracks appeared at a node and over a period of almost three weeks they visibly worsened until collapse occurred.

Inspection and maintenance of Super-T bridge girders

Doubts exist about the durability and maintenance of bridge Super-T girders as a result of lack of access for inspection of sealed internal cavities.

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Reinforced aerated autoclaved concrete planks found on pitched roof of 1990s hospital building

Precast concrete panel fixing

Failure of prestressed hollowcore units during storage and transport

Failure of cast-in wire lifting loops on manhole cover slabs

Channel slab roof deck collapse during reroofing

Roof collapse of warehouse structure under rainwater ponding

Share your knowledge

Grouting of joints between load-bearing prefabricated concrete members

The use of cast-in ferrules as structural connections

Lessons learned from the 2018 Florida bridge collapse during construction

Inspection and maintenance of Super-T bridge girders

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