Comments for Section 3 Flowchart   
Steps 11 to 12 (of 15)              

 

Step 11

Following Method Statement

 

1. Take possession of site
2. Assemble plant
3. Erect access and sheeting
4. Start Bonding Record – Continuous QC
5. Site inspection of materials
6. Obtain Engineering / Client Representative approval to commence further works

Site activities, preparation prior to start of installation
Step 11 defines the preparations and planning that should be considered prior to installation of the reinforcement.

The preparations include;

 

• Taking possession of the site
• Assembling plant
• Erecting access, sheeting, protective coverings etc.


The planning should include the development of a hold point list, containing all the critical activities in chronological order and the roles of those involved in confirming that the specific activity has been completed correctly.

Hold Point
Checked By
Method Statement  
Materials Inspection and Preparation
- reinforcement
- resin
 
Surface Preparation
- inspection
- mechanical test
 
Grout (filler) Profile  
Stage QC check and record
- Adhesive
- Reinforcement (if lay-up on site)
 
QA tests on site on reinforcement
- cure
- thickness - length
- dimensions
- flatness - curvature
- inspection
 
QA sample preparation for off-site tests
 

Hold points during installation

The Client Representative should approve that the appropriate level of planning and preparations have been completed before further site activities continue. Note, the approval process may require modification of the originally proposed site activity plan.

 

Step 12

 

Following Method Statement

 

1. Prepare surface (grit blast, wipe etc.)

2. QA tests:
    (a) Crack inspection & repair
    (b) Pull-off tests / stipple tests
    (c) Bonding Record

3. Obtain Engineer / Client representative approval to commence further works


Surface preparation

Step 12 defines the substrate surface preparation procedure. (See Step 11 for the relevant hold points.) Recommendations for the preparation of concrete, metallic and timber surfaces are provided elsewhere.

The surface preparation procedure should be provided by the adhesive or resin Material Supplier and confirmed by the Designer. It should also conform to the surface preparation used in the Classification Scheme and should include as a minimum:

            • Surface preparation procedure (e.g. grit blast, clean wipe etc.)
            • Inspection procedure for prepared substrate and repair (if necessary) (see Step 14 for acceptable             defects)
            • Tests to be performed on prepared substrate
            • Primer application procedure (if required) and associated QC plan.

A continuous QC plan is recommended for the application of the primer and adhesive. The frequency of testing is one set of tests (see Step 13) per 50 kg of adhesive or resin.

If possible, once the surface preparation is completed a check should be made to ensure the surface is prepared as per the designated procedure. ISO 8501, 8502 and 8503 provides methods of assessing the presence of rust and mill scale, surface contaminants and the profile of the surface following preparation. ISO 8504 provides guidance on the preparation methods that are available for cleaning steel substrates.
TR-57 (2004) provides guidance on the surface preparation of concrete substrates and CIRIA C595 (2004) on steel substrates.

If required, prior to application of the adhesive, various tests can be performed to assess the quality of the bond surface. These include:

            • Surface roughness. A number of small kits can be purchased that measure the roughness of a             prepared surface.
            • Wettability test. Dyne pens can be calibrated to evaluate the wettability of a surface. These are             easy to use but can only be applied on non-porous surfaces, such as steel and FRP.
            • Stipple test. This test is qualitative in that a small amount of adhesive is applied to the surface             using a thin strip. The strip is then removed and if adhesive is still adhering to the surface then the             surface preparation can be considered to be as according to procedure.
            • Pull-off test. This is an established method for assessing bond quality. However, normal practice             requires steel dollies to be bonded and left to cure before testing. This can take a few days and is not             a quick means of immediately assessing the surface condition for bonding.

Recommendations for the assessment of surface preparation on steel, timber and concrete substrates are provided elsewhere.

The Client Representative should approve that the surface has been prepared according to the Specification before further site activities continue. Note, the approval process may require modification of the originally proposed surface preparation method.


 
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