RNC TECHNOLOGY (M) SDN. BHD. (252360-D) Refurbishment & Corrosion Technology Subsidiary of RNC Holdings Sdn. Bhd. (435784-W)

Method Statement

REPAIR OF SPALLED CONCRETE USING FORMWORK GROUTING

1

RNC

Project: Proposed Structural Repair Of Banburry Building At Continental

Tyres Malaysia Sdn Bhd, Jalan Tandang, 46050 Petaling Jaya,

Selangor

1) Identify and demarcate area where pressure grouting is required.

2) Hack all unsound/defective or loose concrete till sound concrete. In areas where rebars are exposed, remove concrete behind rebars.

3) Feather edges shall be removed along the perimeter of the hacked area by means of a disc grinder.

4) For corroded rebars, remove loose rust scales using wire brush. Install sacrificial zinc anode at spacing about 750mm c/c. Apply anti corrosion

primer to all exposed rebars.

5) If the corrosion is severe and more than 10% of the reinforcement area has been lost, install new reinforcement by lapping to the existing rebar with

lap length of 40 x dia. Install sacrificial zinc anode at spacing about

750mm c/c. Apply anti corrosion primer to the additional rebars.

6) Clean loose dirt and dust from the prepared surface using clean water.

7) Install grout tight formwork to the prepared surface with grouting ports at about 500mm spacing and secure formwork with suitable ties.

8) Dispense clean water into formwork assembly through inlet ports using a hand grout pump.

9) Mix the prebagged shrinkage compensated flowing grout with adequate water in a mixing drum. Ensure grout achieves a homogeneous consistency

while stirring.

10) Pump grout mix into the formwork assembly through the inlet ports. Grouting shall proceed from the lower-most inlet port as soon as grout is

observed appearing from the adjacent port, lock off the first port and grout

RNC TECHNOLOGY (M) SDN. BHD. (252360-D) Refurbishment & Corrosion Technology Subsidiary of RNC Holdings Sdn. Bhd. (435784-W)

Method Statement

REPAIR OF SPALLED CONCRETE USING FORMWORK GROUTING

2

RNC

through the adjacent inlet port. Continue grouting in sequence until the

entire formwork assembly is filled with grout.

11) Remove formwork assembly after 3 days and cure by means of wet spray or covering with wet hessians.

Proposed material : Sika Grout 215, polymer modified shrinkage compensated

high strength grout

Sikagard 670 WMY

Corrpre Superanodes GSC10/10

Inlet port 2

Formwork

PRESSURE GROUTING TO SPALLING CONCRETE

Inlet port 3

Inlet port 1