Construction
Concrete Repair in London: Our QA-Led Method Statement (Pinholes to Honeycombing)
04
Nov
Nov
If your concrete shows pinholes, blowholes, spalls, rust-stained cracks or honeycombing, the fix isn’t “just patch it.” Durable repairs come from a method statement that controls safety, surface prep, primers, repair mortars, placement, finishing, curing, and inspection. Below is exactly how we at AmtaarGC deliver concrete repairs on live jobs in London—adapted from the method statement and product data sheets in your document.
What typically fails (and why it returns if you “just fill it”)
- Pinholes & blowholes (formwork air voids)
- Honeycombing (poor compaction/segregation)
- Rebar corrosion & spalling (chlorides/carbonation → rust expansion)
- Edge damage (impact, construction joints, anchors)
A permanent fix requires: correct primer on steel, SSD substrate, compatible repair mortar, controlled curing, and QA sign-off—each step is in the supplied method statement (see Scope, Procedure & QC on pp. 3–10).
Our 7-Step Concrete Repair Method (AmtaarGC)
- Safety first
Toolbox talk + PPE, controls for dust, mixing, handling cementitious materials—as set out under Safety & Health Measures (p. 5). - Defect assessment & limits
We classify the defect (pinholes, blowholes, honeycomb, rebar exposure) and agree the repair class/extent before works (Repair Assessment, p. 5). - Break-out & surface preparation
Remove all loose/contaminated concrete; square-cut edges; expose sound aggregate; treat reinforcement; bring substrate to SSD (saturated surface dry). This is the single biggest predictor of bond success (Surface Preparation, pp. 6–8). - Steel protection & bonding
- Zinc-rich anti-corrosion primer on cleaned steel reinforcement (e.g., Nitoprime Zincrich) and allow to dry as specified.
- Bonding/priming where required (e.g., Nitobond AR) per data sheet. (Sections 6.3 & product sheets).
- Select & mix the right mortar
- Renderoc FC – fine cosmetic/pinholes, skim up to a few mm.
- Renderoc BF2 – blowholes/bugholes around shallow depths.
- Renderoc TG – medium-to-deeper hand-placed repairs, vertical/overhead, and re-profiling.
Mixing ratios, pot life, and placement windows are taken from the data sheets (pp. 15–23).
- Place, profile, finish, cure
Compact properly, build in layers where needed, finish to line/level, protect from rapid drying, and complete curing as per the material instructions (Application, Finishing & Curing, pp. 8–10 & product sheets). - Quality control & sign-off
Works proceed under QC inspection requests (IRs), with hold points for substrate prep, steel treatment, material batch/mix, and final finish (see Quality Control, p. 10).
Materials we specify (from your document)
- Nitoprime Zincrich – single-component zinc primer for reinforcement; application timings, coverage and limitations on pp. 25–28.
- Nitobond AR – acrylic bonding agent/primer for concrete repairs; surface prep, application and curing on pp. 23–24.
- Renderoc FC / BF2 / TG – polymer-modified repair mortars; uses, mixing, coverage, limits, and overcoating guidance on pp. 15–22.
Typical defect → remedy (quick guide)
- Pinholes / skin defects: prep → SSD → Renderoc FC skim → controlled cure → QA.
- Blowholes / bugholes: prep → prime/bond where required → Renderoc BF2 placed & finished → cure.
- Honeycombing / spalls / rebar exposed: break-out to sound concrete → clean steel → Nitoprime Zincrich → bond as specified → Renderoc TG layered build-up → cure → QA IR.
Why our method lasts
Because we enforce substrate condition (SSD), steel protection, compatible mortars, and IR-based QA—the same control points and product procedures spelled out across Procedure and the appended data sheets. That’s how we lock in bond, durability, and a clean finish that takes coatings well.
FAQs
Can you paint/coating after repair? Yes—after the mortar cures; over-coating compatibility and waiting times are in the data sheets (e.g., FC overcoating guidance).
Do you work overhead/vertical? Yes—TG and BF2 are specified for vertical/overhead with correct priming and cure.
Book a site survey
Send photos + a brief description. We’ll mark up the defects, confirm the repair class, and issue a costed method with programme and IR hold points—ready for Building Control or consultant review.