Repair Systems — Concrete & Structural Defects
Abrasives, blades & tools
Technical product reference for preparation tools used in concrete crack repair — crack chaser blades for routing, SDS-Plus rotary hammers for port hole drilling, wire cup brushes for surface cleaning, and hot air guns for pre-injection crack drying in Australian crack repair practice.
Concrete crack preparation — four tool categories
Crack and joint repair preparation requires four distinct tool categories: crack chaser blades for routing, SDS-Plus rotary hammers for port drilling, wire cup brushes for surface cleaning, and hot air guns for pre-injection drying. Using the wrong tool in each step — or skipping steps — is the most common cause of premature sealant debonding and injection resin failure.
Product Reference
Individual products — one card each — scroll to view all
Husqvarna / Diamond Products
Crack Chaser Diamond Blade — Crack Routing to Consistent Profile
Narrow-kerf diamond crack chaser blade — angle grinder
A crack chaser blade is used in the routing step before sealant installation — widening an irregular crack trace to a controlled 4–6 mm kerf with square parallel sides that seat a backer rod correctly. Mounted on a 100 mm or 125 mm angle grinder. The narrow kerf is critical: standard wide concrete blades remove too much material and cannot track a narrow crack trace.
Bosch Professional / Makita
SDS-Plus Rotary Hammer — Injection Port Hole Drilling
SDS-Plus rotary hammer drill — port drilling
Used to drill angled port holes for mechanical injection port installation. Hole diameter 12–16 mm (match to port type TDS). Drill at 45° to the crack plane to intercept the crack trace within the body of the element — holes drilled perpendicular to the surface only reach the crack at the surface, not at depth.
PFERD / Norton Abrasives
Wire Cup Brush / Flap Disc — Crack Edge Cleaning
Abrasive cleaning attachment — angle grinder
Wire cup brushes remove loose concrete, old sealant residue, paint, laitance, and carbonation from crack edges and joint faces — creating a sound, clean substrate for sealant primer and adhesion. Flap discs (40–80 grit) are used where joint faces have a paint or epoxy coating that must be abraded before sealant bond. After brushing, blow the joint with compressed air to clear all loose material and dust before priming.
Bosch Professional / Makita
Hot Air Gun — Crack Drying Before Epoxy Injection
Electric hot air gun — pre-injection crack drying
Epoxy rigid injection resins require completely dry crack faces — even residual moisture prevents full epoxy wetting and significantly reduces bond strength. A hot air gun directed along the crack trace dries surface and near-surface moisture. Pass at 200–250°C along the crack, 1–2 passes, then verify dryness with a moisture meter before injecting.
System Comparison
Concrete cracking — confirm all selections against the current manufacturer TDS before specifying.
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Do not confuse concrete cracking tools with:
- Crack injection pumps — pressure injection pumps (single-component and two-component PU/epoxy injection rigs) are the equipment used to deliver injection resin through the installed ports; they are separate from the preparation tools listed here and are typically hired from specialist crack injection suppliers (DCP Chemprox, Parchem)
- SDS-MAX rotary hammers — SDS-MAX drills (Bosch GSH, Hilti TE series) are heavy demolition hammers for 20 mm+ holes and heavy breaking; they are too aggressive for 12–16 mm injection port holes, causing spalling around the port hole — always use SDS-Plus for port drilling
- Standard wide concrete saw blades — wide segmented diamond blades (2–4 mm kerf) for general concrete cutting are not crack chasers; their kerf is too wide and the cut is too deep for crack trace routing — use a dedicated crack chaser blade (4–6 mm kerf) on an angle grinder for crack work
- Diamond cup grinding wheels — cup wheels (used for surface CSP preparation before coatings) grind the concrete surface uniformly; they are not used for crack edge cleaning and will remove too much material if used on crack faces — use wire cup brushes for crack-edge cleaning
- Mastic gun / caulk gun — standard hand-held or pneumatic cartridge guns are used to apply sealant after preparation; they are the application tool for the sealant or port adhesive cartridge, not a preparation tool — they belong in the sealants category, not in preparation tools
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer TDS, project specification, substrate condition, and applicable standards. Do not rely on this reference as a substitute for professional engineering advice.