Contractor selection criteria
The owner/manager of the construction must specifically state in the tender documents the criteria to be met by the contractor and his applicators based on the criteria described below.
Following are some guidelines to consider when establishing the requirements that the contractor must meet.
General criteria
References/financial capacity to fully execute the repair job responsibly, according to
the country’s rules.
Technical criteria
Depending on the type of work to be performed, official recognition (class/category)
can be required:
- No recognition: mainly for small non-structural concrete repairs, with only cosmetic damage, with restricted diagnostic reports available.
- Approved contractors level A: (e.g. BCCA approval or similar) for all other repairs, with a full diagnostic report available.
- Approved contractors level B: (e.g. BCCA approval BCCA or similar) – with a limited diagnostic report available. Technical expertise is assumed to be available in the middle management of B-level contractors, and proof can be provided if needed.
Certification of applicators
The contractor should at least have one certified applicator for every 6 labourers in each repair team, capable of completing the requested repair. The names of these applicators should be recorded daily.
Site control design
Tender documents
The tender documents must explain and specify what types of site control will be performed to ensure alignment between the contractor’s work and the project and detect potential defects.
There are two different options:
Independent site control by a third party.
An architect, consultant, engineer, or an approved control organisation will carry out the control as an independent third party.
Self-control by the contractor
The contractor will control its work itself with his own procedures. For the establishment of these procedures see chapter 8 of this guide.
Record of information
Regarding site control, daily records of the following information and specifications must be kept:
Division of site
Depending on the size and difficulty of the work, it must be determined if the construction to be repaired should be considered one part (small works) or if it should be divided into several parts. Due to its importance to site control, this issue should be included in the tender documents.
Three adhesion tests will always be conducted on each part of the construction that is being repaired in two stages:
- As a first step, on the cleaned concrete, as a control of the diagnostic information.
- Later, on parts of the repaired concrete, to be indicated by the owner or contractor.
The average of the two highest results should always be higher than the value stated in EN 1504-3 standard – table 3, reduced to 80% for in situ testing, depending on the
type of recovery mortar chosen (R3 or R4).
The adhesion tests will be budgeted separately in the measurements state.
Completion of the work and aftercare
It is the contractor’s responsibility to provide a written declaration, stating that the repair job has been performed according to the prescriptions and the standard of knowledge at the time, or that some shortcoming was required to be addressed, when, where, and why, which had already been known to the owner or the architect or consultant engineer.
Following the abovementioned declaration, the contractor will issue a written general aftercare advice, with special care if a shortcoming occurs.
