Marine Construction
Sprayed concrete is frequently utilised in the repair and refurbishment of marine structures. The use of high performing micro concrete in Marine Construction offers superior protection from chloride attack than standard conventionally poured concrete, and is often incorporated into cathodic protection systems as an overlay.
Sprayed concrete has a wide application range within Marine Construction due to its adaptability, flexibility versatility of application, high structural integrity, physical properties and favourable economics.
Sprayed concrete is particularly suited to working within a tidal environment as the method capable of accessing difficult areas beneath piers and jetties, is quick and easy to set up and de-mobilise when tidal conditions dictate.
Sprayed concrete repair is commonly used for:
- Refurbishment of concrete harbour walls, jetties and berthing dolphins
- Coastal defence structures
- Columns and concrete support beams
- Cathodic protection to marine structures – encapsulation / overlay to CP management systems
- Replacement of defective, scoured, impact damaged or spalled concrete
- Strengthening and repair of existing concrete structures
- Reinstatement of concrete on vertical or overhead surfaces
The removal of the defective areas of concrete, preparation of the exposed steel reinforcement and concrete reinstatement has to be done correctly for the repair to be durable and have structural integrity. GSSL have the capacity, and trained workforce to cover all these preparation requirements in- house.
Hydro-demolition is often the preferred option for concrete removal on larger scale concrete repair work projects, and GSSL have long standing working relationships with reliable outsourced partners for this option.
The advantages over conventional concrete repair methods are:
- Rapid initial set times to allow early strength gain between tides
- Application of sprayed concrete repair without any formwork/shuttering
- High impact bonds to existing substrates
- Higher daily outputs compared to hand applied concrete repair mortar
- Increased depth of repair and fewer layers = monolithic concrete repair
- Superior encapsulation of steel reinforcement
- Lower material wastage due to drop outs and delamination during application
Successful sprayed concrete repair requires the combination of many aspects of modern concrete technology particularly concrete admixture chemistry, combined with modern materials handling technology.
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The increasing demands for cost-effectiveness and the protection of health and the environment mean that sprayed concrete has been in continuous development for the last few decades with a proven track record.