METHOD STATEMENT FOR THE CONSTRUCTION JOINT TREATMENT

Scope: Methodology for the treatment of the construction joints.

Material:

1. Conbextra GP2/ Power Grout Flowable /Equivalent
2. Nitobond SBR Latex.
3. Cement.
4. Cebex 100.

Equipment:

1. Concrete cutter.
2. Pan.
3. Brush.
4. Trowel.

Methodology: The construction joint shall be inspected before the commencement of work, whether there is leakages observed or not through pond test. Following treatment, a procedure needs to adopt.

Case I: Construction joint treatment where leakages are not observed.

1.  Surface thoroughly cleaned and made free from any loose, dust and slurries over them.
2. Identified construction joint should be saw cut / V notch to a depth of a minimum 20 mm and width of 15mm so that repaired patch should form a rectangular shape.
3. The surface to be prepared should be cleaned with water before carrying out repair work.
4. The prepared surface is in SSD condition, apply a coat of SBR Latex bonding agent /equivalent along with cement and water in a proportion of 1:3:1 by weight using a brush by scrubbing it well into the surface.
5. Power Grout (Flowable) / Conbextra Gp2 / Equivalent shall be applied on ‘V’ groove as per the technical data sheet.
6. The rectified surface should be cured properly.

Case II: Construction joint treatment where leakages were observed.

1. Surface thoroughly cleaned and made free from any loose, dust and slurries over them.
2. Identified construction joint should be saw cut / V notch to a depth of a minimum 20 mm and width of 15mm so that repaired patch should form a rectangular shape.
3. The surface to be prepared should be cleaned with water before carrying out repair work.
4. The prepared surface is in SSD condition, apply a coat of SBR Latex bonding agent /equivalent along with cement and water in a proportion of 1:3:1 by weight using a brush by scrubbing it well into the surface.
5. Power Grout (Flowable) / Conbextra Gp2 / Equivalent shall be applied on ‘V’ groove as per technical data.
6. Application of bonding agent like SBR Latex mixes with cement and water at the proportion of 1:3:1 by mass on the entire affected area 600mm on either side of the joint with requisite non-shrink additives (Cebex 100).
7. Curing is to be performed by making ponding for 7 days.
8. The treated construction joint is to be checked with a pond test.

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