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Concrete Repair

Concrete Repair

We offer a comprehensive range of concrete repair solutions, with various methods employed depending on the type of repair required. When exposed to heat, thermal movement occurs and as a result, cracks are formed on the surface which needs to be repaired to avoid water from seeping in. This, coupled with heavy rainfall, exacerbates the problem.

Common Problems

Spalling Concrete

Spalling concrete is a common issue for older buildings. It is largely caused by carbonation, a natural deterioration process. This causes the steel bars embedded in the ceiling slab to corrode, which in turn causes the concrete cover to crack and bulge.

Interfloor seepage

Interfloor seepage is a common occurrence that happens when a waterproofing issue trickles downwards and affects the floor below. As a result of interfloor seepages, continuous dripping from the ceiling or the presence of damp spots are commonly experienced.

Depending on the severity of the seepage, different repair methods can be employed. For minor leaks, a localised repair using PU grouting can be used to troubleshoot the issue. For severe leaks, a comprehensive repair must be carried out which involves waterproofing works on the floor above.

It is important to note, however, that the leaks are not arising from concealed pipes — which is a plumbing issue and not a waterproofing issue. We can help you differentiate one from the other if you are unsure of where the leaks are coming from.

Concrete Repair Methods

Spalling Concrete Repair

It is important to attend to spalling concrete immediately to preserve the building’s structural integrity, as leaving it unattended over a long period will cause it to spread to a wider area. Repair methods entail removing the loose concrete, treating the rebar with anti-rust coating and finally re-plaster the surface with high strength mortar.

Formwork Grouting

Formwork grouting is necessary when serious honeycombing or defects are present in existing concrete structures. This method of repair entails using formwork to form a mould around the affected structure and high strength non-shrink cementitious grout are injected in under pressure to fill up the big voids and gaps at the affected concrete structure.

PU Grouting

PU grouting involves the injection of expanding polyurethane to stop water from flowing into cracks, or to fill voids within slabs and concrete joints. A pre-drilled hole will be prepared on the underside of the ceiling, and the PU grout will be injected under pressure. The grout material, when mixed with a certain amount of accelerator, will react with water or moisture and expand, to form a tough, closed-cell rubber that is essentially unaffected by corrosive environment.

We provide free investigative and diagnostic reports, and budgetary costing with no obligation. Contact us today.

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