A sports hall floor carries court play, warm-up, entrance changeover, storage and a nearby wet area on one polished concrete surface. This article covers joint readiness, fit-out scheduling, wear and impact, slip grades, marking lines and acceptance, for the contractor PM and owner's representative.

The floor sees footwear traction, dropped equipment, cleaning water and event setup. Site limits below: dry PTV at least 36, wet PTV 10 to 20 points lower, DCOF at least 0.42, wet areas R10 to R12, gloss at 60 degrees, inspection light 300 to 500 lux.

1. Scope and Performance Expectations for Sports-Hall Floors

The scope meeting splits the hall into zones: main court, warm-up run-off, entrance changeover, storage room, and any wet area by changing rooms. Each zone has different load and cleaning exposure; record court dimensions, weekly hours and fit-out work sharing the schedule.

Confirm handover conditions: ventilation, machine and slurry storage, water and power, noise or dust limits for adjoining rooms. Hold the slab at 10 to 30 degrees Celsius, RH under 75 to 80 percent; outside this envelope grinding and curing behave unpredictably.

2. Substrate, Moisture and Joint Readiness

Moisture and joint condition drive later defects. Test at least four points per zone, including near external walls and the wet area, recording internal RH and surface moisture. Above the limit, stop and agree drying or membrane work in writing before finishing.

Profile runs CSP 1 to 2 for heavy aggregate, 3 to 4 for medium, 5 to 7 for near-mirror. Joints, cracks, spalls and weak laitance are repaired or cut out first; joints are filled flush so the polished surface reads continuous. Grinding over a weak joint reveals the hollow later.

3. Zoning and Scheduling Around Fit-Out Work

Hall fit-out, bleacher installation and equipment delivery often overlap polishing. Grind and densifier in closed-off zones, then resin polish after dust-heavy fit-out is done. Estimate 6 to 8 productive hours per block, and sequence wet slurry work away from stored equipment.

Barrier off the active zone with fencing and signed routes; protect courtside barriers, fixed equipment and stored items from slurry. Agree who cleans past the barrier line. Sign off these pre-start checks before each block:

• Relative humidity stays below 75 to 80 percent; slab surface held between 10 and 30 degrees Celsius, logged per zone.
• Joints filled flush and repaired defects checked before the grind pass.
• Supply lines for water and power and slurry removal signed off; about 100 to 200 liters of slurry accumulate each block.
• Nearby fit-out stopped or protected; cured areas marked off from traffic.

4. Grinding and Densifying Sequence for High-Traffic Courts

The sequence runs from coarse metal blocks to fine resin pads, densifier after a stable grind. Metal blocks run 16, 20, 30 and 40 grit; resin pads cover 100, 200, 400, 800, 1500 and 3000 grit. Advance only when scratches vanish; each pass overlaps one-third of head width.

For the hardener, mix 1:64, roughly 15 ml per liter, first application, then 1:128, roughly 8 ml per liter, lighter second pass. Spread uniformly, keep dwell time, wash off slurry before it turns white. The table maps each zone treatment, slip class and test criterion.

5. Slip Zones, Wet Areas and R10–R12 Classification

Slip is set per zone, not floor-wide. Dry court concrete reads PTV at least 36; wet surfaces drop 10 to 20 points, so entrances and the wet area use finer texture or local anti-slip treatment, not mirror polish. DCOF at least 0.42 is the walking minimum.

Wet areas grade R10 to R12 by exposure: R10 for occasional wetting, R12 for regular shower or cleaning runoff. Seal joints in wet zones so water does not track under the surface. A texture band at entrances blends into the court finish without a hard visible line.

6. Impact, Wear and Flatness Expectations

Sports halls take dropped weights, shoe traction and equipment rollers. Densifier penetration and a full resin sequence hold wear better than a surface-only shine; the polished layer is no sacrificial coat. Set finish per zone so high-load sidelines avoid a quick-wearing mirror.

Flatness is checked along joints and high-traffic paths with a straightedge before final polish; lippage or low spots are ground down at the honing stage, not after sealing. Watch aggregate pop-outs that signal a weak surface, and repair them before the gloss pass.

7. Marking-Line Interface, Edge Treatment and Test Points

Court marking lines sit on the finished concrete. Agree the interface early: the surface must be fully cured and dry before paint or tape, and line edges are cleaned of densifier residue. Treat line zones to a consistent sheen so marks bond evenly and do not peel at the edges.

Inspect the interface at line starts, intersections and sideline turns: no lift, no bleeding under the line, smooth transition between polished band and marked area. Record test points at court center, sidelines, entrance, wet area and corners on the as-built plan.

8. Acceptance, Dispute Resolution and Long-Term Handover

Walk through under hall lighting plus oblique light of 300 to 500 lux to reveal scratches, swirls, cloudiness and haze. Record gloss, slip and visual check at each grid point; mark defects by location and severity, and agree the fix before sign-off.

Common disputes: court-to-entrance gloss mismatch, wet-area slip, peeling lines, haze blamed on cleaners. Settle each on recorded measurements and the zone spec. Re-coat at 3 to 5 years, shortened to 2 to 3 years at busy courts and entrances; revisit at 30 and 90 days for wear and gloss.