CONCRETE CANCER (SPALLING)


Concrete cancer is a colloquial name for concrete degradation caused by contaminants or weather. It oftens refers to rusting of the concrete reinforcement bar (rebar), but also applies to other concrete failures.

Examples of concrete spalling

Several forms of concrete defect can occur, but the major cause is water penetration to the rebar, which then rusts and expands, forcing the surrounding concrete to spall (break away).

Concrete cancer can be treated in most structures. Compatible Concrete Repair can remove the spalled concrete, clean and treat the exposed steel (or replace if possible), then repair to the original concrete profile using compatible polymer modified mortars.

Cracks are repaired using epoxy and polyurethane resins with specialised injection techniques.

Spalling repair before & after

CCR only use products compatible with the substrate for longevity of the repair and service life of the structure, hence Compatible Concrete Repair.

SHOTCRETING


Shotcrete is a concrete construction and repair technique where concrete is conveyed through a hose and pneumatically projected at high velocity onto a surface.

Surface preparation for shotcrete application

Shotcrete is placed and compacted simultaneously, due to the force with which it is projected from the nozzle. It can be impacted onto any type or shape of surface, including vertical or overhead areas.

Shotcreting in progress

The sprayed concrete can also be reinforced (steel or synthetic) for stabilisation in applications such as slopes or tunneling.

Shotcreting finish on existing wall

Compatible Concrete Repair can repair large scale weakened or spalling areas efficiently using this method, and the result is just as durable as traditional concreting methods.