How to judge whether the ground is suitable for colored sand floor coating?

To determine whether a floor is suitable for colored sand floor coatings, comprehensively evaluate the following key indicators:

1. Foundation Condition Testing

Flatness Requirements

Use a 2-meter straightedge to check for gaps ≤ 3mm. Local depressions require repair with epoxy mortar.

Base Strength

Concrete strength must be ≥ C25, with pull-off adhesion ≥ 1.5 MPa. Sanded surfaces require sandblasting.

Moisture Content Control

Base moisture content must be ≤ 8% (tested with plastic film). A moisture barrier is required for humid environments.

2. Environmental Adaptability

Environment Type

Suitability Criteria

Industrial plants must pass the Taber abrasion test (abrasion loss ≤ 0.02g).

Food processing plants must pass the acid and alkali resistance test (no change after 72 hours of immersion in 5% NaOH/5% H₂SO₄).

Medical facilities Antibacterial performance testing is required (antibacterial rate ≥ 99%).

3. Special Scenarios

Areas with large temperature fluctuations: Thermal expansion coefficient testing is required (recommended ≤ 8 × 10⁻⁶/°C).

Heavy-load areas: Compressive strength ≥ 90 N/mm² is required; additional reinforcement mesh is recommended.

4.Pre-construction Pretreatment

Oil-contaminated surfaces require flame treatment (residual oil stains ≤ 5 cm²/m²).

Old floors require polishing to expose a fresh base surface (roughness Ra ≥ 50 μm).

Expansion joints require elastic adhesive filling (displacement ≥ 5 mm).

Note: It is recommended to conduct a sample test 48 hours before construction to observe the curing effect and color difference.