Application of Cocoon – Chemical Salt Extraction United Arab Emirates
The project entails the restoration by process of chemical, salt extraction of the family home of Sheik Mohamed Bin Khalifa in Al Ain, United Arab Emirates. The original structure dates back to about 1958 with some alterations over time. The buildings being turned into a museum and the architects in charge of the project wanted to keep as many as possible of the original structure.
The tender required that chlorides and sulphates be removed from the existing concrete structure up to acceptable levels set out by the consultants.
Cocoon Desalination System
To assess the effectiveness of the Cocoon desalination system (chemical, salt extraction) a test was performed on Block A, front elevation, the third column at the front entrance.
Normally Cocoon desalination is done by putting a minimum of two consecutive coatings of the materials on the surface. Each coating is left on for a minimum of two weeks.
The result is assessed by three measures:
- Chloride and sulphate content test on 5 depths BEFORE cocoon is applied
- Chloride and sulphate content test on 5 depths AFTER the first layer of Cocoon is removed
- Chloride and sulphate content test on 5 depths AFTER the second layer of Cocoon is removed
Tests were executed by a third-party lab, GTL (Geoscience Testing Laboratory) & ACES and by the Cocoon manufacturer Westox in Australia.
A total reduction in chloride content of 67.50% is achieved after cocoon treatment.
The project is currently in execution and expected to open to the public by the middle of 2020.
Chemical, Salt Extraction
Cocoon provides an innovative breakthrough in the removal of accumulated corrosive salts.
Applied as an external poultice on the slab surface, Cocoon draws salts out of the structure, protecting concrete and reinforcing from further degradation. For suitable applications, within 4-6 weeks, slabs and reinforcing can be returned to an alkaline environment.
Manufactured from paper fibres, Westox Cocoon is non-toxic. Post-treatment, the waste product is non-hazardous and easy to dispose of.