Repair Systems — Concrete & Structural Defects
Abrasives, blades & tools
Technical product reference for diamond saw blades, demolition hammers, rebar cleaning tools, and surface preparation equipment used in reinforcement corrosion repair — covering the correct preparation sequence: saw cut perimeter, chip out, clean rebar to St 2, grind substrate for mortar or CFRP bond.
Abrasives, blades and tools for reinforcement corrosion and concrete repair preparation
Surface preparation is the most critical stage in concrete repair and reinforcement corrosion treatment. The quality of the bond between the repair mortar (or CFRP laminate) and the existing substrate is determined almost entirely by the quality of surface preparation — inadequate preparation is the leading cause of repair failure. The core preparation sequence is: perimeter saw-cut, break-out, rebar cleaning, substrate profiling, and primer application.
Product Reference
Individual products — one card each — scroll to view all
Bosch / Hilti / Milwaukee — Tool Hire or Purchase
Diamond Saw Blade — Perimeter Cutting
Segmented diamond saw blade — concrete cutting
A segmented diamond saw blade mounted on an angle grinder, concrete saw, or cut-off saw is used to saw-cut the perimeter of the repair boundary before break-out. Perimeter saw-cutting defines the repair boundary, prevents undercutting the adjacent sound concrete, and produces a clean saw-cut face with a minimum 10 mm depth — AS 1627.0 and EN 1504-10 both reference perpendicular saw-cut faces as best practice for patch repair boundaries. Wet cutting is preferred to reduce silica dust — confirm dust suppression method with the site health and safety plan.
Bosch / Hilti / Milwaukee — Tool Hire or Purchase
SDS-MAX Demolition Hammer
SDS-Max electric demolition hammer — concrete break-out
SDS-Max electric demolition hammers (5–15 kg class) are used to break out spalled, delaminated, or carbonated concrete in the repair zone after perimeter saw-cutting. The SDS-Max chuck accepts demolition chisels (point, flat, and gouge types) for controlled concrete removal. The key discipline in concrete break-out is to work within the saw-cut perimeter and avoid undercutting the adjacent sound concrete — use a sharp flat chisel at the boundary rather than a pointed chisel, which can travel under the edge.
Needle Gun / Wire Cup — Hire or Purchase
Needle Gun / Wire Cup Wheel — Rebar Cleaning
Pneumatic needle gun or wire cup wheel — rebar surface preparation
After concrete break-out, corroded reinforcing steel must be cleaned to a minimum standard before rebar primer can be applied. In most remedial repair specifications, the minimum cleaning standard is St 2 (thorough hand tool or power tool cleaning) per AS 1627.4, which requires removal of loose rust, scale, and contamination — the steel should have a light metallic sheen after cleaning. The two primary tools are the pneumatic needle gun (for irregular surfaces and tight spaces around the bar) and the wire cup wheel on an angle grinder (for faster cleaning of straight bar lengths).
Hilti / Bosch / Trade Supplier
Diamond Cup Wheel — Substrate Preparation
Diamond cup wheel — concrete surface preparation
A diamond cup wheel mounted on an angle grinder or floor grinder is used to prepare concrete surfaces to the concrete surface profile (CSP) required before repair mortar, bonding agent, or CFRP laminate application. Most polymer-modified repair mortars require a minimum CSP 3 substrate profile (medium roughness, visible aggregate), and CFRP external bonding requires CSP 3 minimum with a pull-off strength ≥ 1.5 MPa. Diamond cup wheels are available in single-row and double-row segment configurations — single-row for aggressive removal, double-row for a finer finish.
System Comparison
Reinforcement corrosion — confirm all selections against the current manufacturer TDS before specifying.
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Do not confuse preparation tools with:
- Grinding discs and cutting discs — abrasive grinding discs (stone discs, fibre discs) are not suitable for perimeter saw cutting — they do not create a clean vertical face and must not be substituted for diamond blades at repair perimeters
- SDS+ class hammers — SDS+ (standard SDS) hammers are lighter than SDS-MAX and suitable only for small patches and fine chipping work near PT tendons — they cannot substitute for SDS-MAX in large concrete removal areas
- Angle grinder flap discs — flap discs grind steel and are not appropriate for concrete substrate preparation; diamond cup wheels are required for CSP surface profiling of concrete before mortar and CFRP bonding
- Sandblasting and shot blasting equipment — wet or dry blasting can achieve CSP 3–4 surface profile more consistently than hand grinding on large areas, and is preferred for large CFRP installations — it is not an abrasive tool but an alternative preparation method for larger areas
- Rebar cutting discs — steel cutting discs are used to cut rebar to length; they must never be applied along the length of a bar for cleaning — notching or scoring the bar reduces cross-section and creates a stress raiser at the repair location
Disclaimer
This page provides general technical information only. All work near post-tensioned tendons requires GPR survey and structural engineer clearance before breaking or saw cutting. Silica dust controls (P3 respirator, LEV or wet cutting) are mandatory per SafeWork Australia requirements. Do not rely on this reference as a substitute for professional engineering or WHS advice.