Inside an operating terminal, a polished concrete floor is handed over while passengers keep moving: concourses, baggage reclaim and gate approaches stay open around the clock, split between foot traffic, wheeled luggage and service carts. Closing the contract depends on the base appraisal before deployment, the strip-by-strip handover split, and limits approved with the operations team. This review covers slab appraisal, night sequencing, diamond order, grip and sheen targets, and sign-off.

Scope covers departure and arrival concourses, the reclaim hall, gate entrances, service back corridors and border strips to tile or resin. Before deployment the PM verifies slab age, structural strength, joint layout, prior coatings and moisture; deficient sections are stated as tender assumptions up front and settled away from the operating floor.

What honed concrete brings to terminal buildings

Terminal slabs are poured monolithically over large bays, so the walking surface forms part of the slab rather than a separate overlay. Once laitance and weak paste are removed and pores closed by densifier, the finish lifts no coating dust. Three wear patterns share one floor: concourses, where passenger and luggage streams hold a steady sheen; reclaim halls, where trolley wheels repeat the same strips daily; gate entries, where rainwater and spills gather inside doors. A honed profile near CSP 5–6 stands up to heavy traffic, and upkeep is a dry mop and neutral agent.

Base appraisal, joint condition and moisture before deployment

Crews review every concourse section on paper before machine work: slab age, trowel finish, old coatings, repairs, cracks, joints and repair mortar. Powdery soft areas and weak patches are flagged for mending ahead of the diamond run; a slab showing CSP 1–2 after a light metal pass needs exposed-aggregate finish or repair first. Work proceeds only when ambient RH stays 75–80% and slab surface reads 10–30 ℃, since reaction and evaporation slow outside that range. Moisture is recorded at probe depth; joints over 3–4 mm are photographed and logged.

Live terminal operations, strip zoning and night-shift organization

Terminal finishing is delivered in sealed strips, not one open hall. Bays split into zones around 250–400 m² per grinder shift, each with its own access route and extraction duct; separate zones run because finish targets differ. The night block leaves a 5–7 hour turnaround; grinding or resin stages, cleanup and inspection must fit that window, and densifier strips stay locked until morning. Walking and cart traffic returns after 24–72 hours; machinery comes back once the full sequence ends, 5–7 days after the first pass. The shift log becomes the handover record.

Diamond order, pad progression and densifier coats

Machine work moves metal bond to resin in full-bay passes. Metal starts at 16 or 20 grit to break up laitance and flatten trowel marks, then 30 and 40 grit level the grain; one grit skips only when a straightedge rules out deeper marks. Resin pads go 100, 200, 400, 800, ending at 1500 or 3000; scratches surviving to 800 cannot be masked at 1500. Lanes overlap 100–150 mm; each grit checked under 300–500 lux light. Apply densifier dust-free, first coat 1:64, roughly 15 ml per litre; second coat 1:128, roughly 8 ml per litre; damp 20–40 minutes.

Working conditions, floor protection and refresh interval

Ambient RH holds within 75–80% and slab surface between 10 and 30 ℃; below the lower mark the reaction stalls, above the upper mark the solution dries too fast and leaves hazy spots. Ventilation follows each coat to clear moisture before the next pass. A penetrating guard at entries and approaches cuts spill stains without a peel-prone film. Refresh follows traffic: concourse strips renew on a 3–5 year plan, reclaim lanes and trolley routes are inspected every 2–3 years.

Sign-off thresholds and inspection layout

Sign-off limits are fixed in writing before mobilization, each tied to a measurable test rather than the word "smooth". Sheen is read with a 60° meter; neighboring strips may vary by up to 5 units, while a gap over 15 units triggers rework. Every record lists strip, date, reading and signature, and the written criterion settles disagreements between readings.

Common arguments, defects and repair practice

Recurring arguments cover sheen inconsistency across wide bays, white bloom after densifier, grip at wet gate entries, and trolley-wheel scratches after reopening. The final walkthrough follows the operations rep against the tender schedule; defects get a number on the layout before repair scope is agreed.

1. Dull strips are marked across the bay; soft spots or fast-setting densifier are checked, then resin stages re-ground to bring sheen in line.
2. White crust means densifier dried on the skin: light wet pass at 400–800 grit; if cured hard, return to 200 grit.
3. Trolley scratches are logged by position and depth; most carry grit on wheels, fixed by spot refresh.
4. Wet gate complaints are checked against PTV and DCOF; finish or signage settled in writing before regrind.
5. Joints, skirting and thresholds are hand-ground; edge match recorded and hollows flagged.

Handover to operations, briefing and care expectations

At sign-off the contractor provides the as-built finish plan, grit order, product names and dilution rates, joint treatment notes, reading logs and a care sheet. The operations rep walks the hall, shown where inspection points sit and how readings were captured. Each strip carries a signed acceptance record; open items carry date and owner. Honed concrete settles slightly over its first 6–12 months as the wear layer compacts, and dull lanes along trolley routes are ordinary wear.