Frequently, with the restoration or repair of old buildings, it is necessary to replace a damaged section of concrete and an increase in section size is required due to the greater loading requirements, or to change section profile. The engineer may be concerned as to whether the support structure can take an increase in mass. It is also sometimes difficult in older structures to establish the precise loadcarrying capacity of the support structure due to lack of information regarding its original design or current condition.
The use of a low density concrete can get round many of these problems, and if it also has high compressive, flexural and tensile strength and a high modulus, the engineer and structure owner can be more confident that the repair will provide a long and satisfactory service life.
When it was required to replace the thin balconies (75mm thick) of these 1920’s housing blocks, Toproc LW was the natural choice to provide performance for the future. There was a particular desire to use a concrete that had low permeability that would protect the reinforcing steel and prevent the reoccurrence of the carbonation of the concrete and the corrosion of reinforcement that required the balconies to be replaced.
The Toproc LW was pumped into place and compacted and finished using conventional procedures and equipment.
The incredibly fine matrix, a feature of all Toproc products, also produced a superb, high-quality finish to the elements.