1. TABLE OF CONTENTS
1. GENERAL
2. INVESTIGATION AND EVALUATION OF DAMAGED CONCRETE SURFACES
3. CONCRETE REMOVAL
3.1 Impacting method (for honeycombed and exposed re-bar)
3.2 Grinding (for abrupt or gradual irregular surfaces)
3.3 Cutting
3. SURFACE PREPARATION
4. REPAIR MATERIALS
5. REPAIR AND FINISHING PROCEDURE
APPENDICES
ATTACHMENT 1: PRODUCT DATA SHEET & MANUFACTURER’S APPLICATION
METHOD
1. GENERAL
This following Method Statement covers surface preparation and repair of
damaged or defective concrete surfaces for building works.

2. The repair method consists of Investigation and evaluation, concrete removal,
preparation for repair, repair materials and concrete repair method and
rehabilitation of concrete surfaces.
2. INVESTIGATION AND EVALUATION OF DAMAGED CONCRETE SURFACES
Before performing repairs on damaged or defective surfaces, a visual
inspection of the exposed concrete on site shall be performed. The purpose of
such an examination is to locate, Identify and define areas of distress.
Typical construction faults that may be found during visual inspection:
● Bug holes
● Cold joints
● Exposed reinforcing steel
● Honeycombing
● Irregular Surface
3. CONCRETE REMOVAL
All weak, damaged and easily removable concrete should be chipped away.
Classification of concrete removal method to be applied:
3.1 Impacting method (for honeycombed and exposed re-bar)
- Generally employ the repeated striking of a concrete surface with a
mass to fracture and spall the concrete
● Hand-held breaker
- Using hand-held breaker or chipping hammer for removal of
unsound concrete.
● Steel chisel and hammer
- Dismounting unsound and loose concrete and trimming the
repaired surfaces
3.2 Grinding (for abrupt or gradual irregular surfaces)
● Rubbing carborundum on gradual irregular surfaces
● Using grinding machine with concrete grinding disc
● By bush-hammering
3.3 Cutting
- Method applicable for making cutouts through concrete members
and employ full depth perimeter cuts to disjoint concrete for removal as
a unit: Using concrete wheel cutter

3. GRINDER
CONCRETE
WHEEL CUTTER
4. SURFACE PREPARATION
RUBBING
HAND
BREAKER
- One of the important steps in the repair or rehabilitation of a concrete
structure is the preparation of the surface to be repaired
-To achieve a sound clean and rough textured, and wet or dry surface, adopt
the following method of surface preparation:
● Mechanical preparation
- Using variety of mechanical devices available for cleaning concrete
surfaces such as breakers, chisel or impact tools
● Cleaning
- Using water to cleaning
● Scrubbing
- Using wire brush manually or electrical powered wire brush
* Other method of preparation are mentioned on manufacturer’s preparation
procedure

4. SCRUBBING
MECHANICAL PREPARATION USING
5. REPAIR MATERIALS
Type of material to
CLEANING BY
WATER
IMPACT TOOLS
be used Bonding material Patching Material Remarks
Sika Sika Monotop 610 Sika Monotop R
Cormix Saturated with water
on surface Conpatch 600
Refer to Attachment 1 for product data sheet.
5. REPAIR AND FINISHING PROCEDURE
Refer to Attachment 1 manufacturer’s application method.

5. ATTACHMENT 1:
PRODUCT DATA SHEET & MANUFACTURER’S APPLICATION METHOD

6. 1. SIKA MONOTOP 610 (BONDING BEFORE APPLY SIKA MONOTOP R)

7. 2. SIKA MONOTOP R

8. 3. CONPATCH 600