When a slab, column or wall has to be extended after the concrete has already been cast, the connection depends entirely on how well the new starter bars are anchored into the existing structure. A drilled hole filled by hand with mortar will not develop the bar.
Injection epoxy fills the annulus completely and bonds chemically to both the concrete and the bar, developing anchorage that in most cases exceeds the yield strength of the steel itself. It is the standard method for structural extensions, retrofits and strengthening work.
Supplied to contractors and builders, or supplied and applied by our own teams with a written warranty.
| Type | Two-component, solvent-free epoxy injection resin |
|---|---|
| Compressive strength | Typically 70 – 90 MPa at 7 days |
| Bond strength | Generally exceeds rebar yield in sound concrete |
| Hole diameter | Bar diameter + 4 to 8 mm (per bar size) |
| Embedment depth | Typically 10 – 20 times bar diameter, to the engineer's design |
| Gel time | Approximately 8 – 15 minutes at 30 °C |
| Full load | After 24 hours at 30 °C |
Typical values for guidance. Actual figures vary by grade and manufacturer. The data sheet for the exact product supplied on your project is provided with delivery.
380 ml and 585 ml coaxial cartridges with static mixer nozzles; bulk packs for large programmes.
The sequence our teams follow, and the sequence we recommend to contractors buying the material from us.
Drill to the specified diameter and depth with a rotary hammer, avoiding existing reinforcement.
Blow, brush, blow, and repeat at least twice. Dust left in the hole is the single biggest cause of anchor failure.
Dispense from the base of the hole upward, withdrawing the nozzle steadily and filling about two-thirds of the depth.
Push the clean bar in with a slow twisting motion. Excess resin should be pushed out at the mouth.
Do not move or load the bar during the specified cure time.
Cementitious and epoxy non-shrink grouts for machine bases, anchor bolts, column base plates and structural gaps.
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Polymer-modified and micro-concrete repair mortars for spalled slabs, beams, columns and honeycombed concrete.
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Polyurethane, silicone and polysulphide sealants for expansion joints, glazing, wet areas and structural movement gaps.
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Plasticisers, superplasticisers, retarders, accelerators and waterproofing admixtures for ready-mix and site-batched concrete.
View Details →Tell us the area, the structure and the problem. We will recommend the right system, quote it in writing and, if you want, apply it ourselves.
