Respondent's Claim re Quality/Defects/the CMET Report:
The respondent raises a new issue in the Adjudication Response, that there are substantial quality/defects issues in relation to the Subcontract Works performed by the claimant, relating to the life of the slab and the general workmanship, and including substandard concrete works, inconsistent finishes and cracks.
The respondent provides a report dated 25 November 2012 ("the CMET report") from CMET Technology Pty Ltd ("CMET"), a specialist corrosion and materials engineering consultancy, as to the condition of the concrete works carried out by the claimant, and says an amount of approximately $400,000 should be deducted in respect of these quality/defects issues.
The CMET report sets out, in a 5 page summary plus Attachments, and an email dated 28 November 2012, a series of comments and conclusions. In brief, the CMET report indentifies defects and deficiencies in the concrete pavement, including that there were shrinkage cracks in some areas of the slab (potentially reducing the design life by 10 years, and necessitating patch repairs to reinstate the surface, and to prevent further corrosion), inadequate caulking of control joints (allowing seepage of water into the interface and retention of the moisture, long-term corrosion which could affect the connection between the slabs), and marked variation in the surface texture across the slab (attributable to poor workmanship, affect the appearance and creating cleaning difficulties). CMET notes (Section 3 of the CMET report) randomly orientated cracks (associated with poor moisture evaporation control from the top surface of the slab), perpendicular cracking (localised, reflecting the position of the underlying steel mesh, attributable to settlement cracking), parallel thickness), poor concrete surface texture, variable slab thickness, and deficient caulking integrity.
CMET recommends a method for rectification of the claimant's defective works, namely application of an epoxy modified cementitious coating which is applied over the concrete surface (approximately 5mm depth) after treating the surface with acrylic primer. The specification advised by CMET is as follows: