Stadium Turf Safety Auditor & Traction Analyzer

Stadium Surface Parameters

NFLPA / ASTM F1936

Audit Venue Presets Maracanã Transition

Cleat Specification Detachable 7-Stud (1/2")

Volumetric Soil Moisture (TDR) 24.5%

Optimal grass shear zone: 18% - 30%

Sub-Base Compaction / Bulk Density 1.42 g/cm³

Threshold: > 1.58 g/cm³ risks excessive G-Max bounce

Root Mat Tensile Anchoring 78 mm

Deeper root mass prevents divoting & slip-outs

Groundskeeper Interventions

Field inspector active. Click any zone on the stadium pitch to sample localized Clegg hardness and rotational shear torque.

Pitch Safety Heatmap & Diagnostic Surface

Interactive 100-Yard Field Grid · Tap or Drag to Probe Zones

ZONE: Midfield Hash (Yd 50)

TEST RIG: 2.25kg Clegg Impact Soil Tester

Impact Hardness (G-Max)

84.2g

NFL Target: 65 - 95g (Max 100g)

Rotational Torque

43.8N·m

Safe release: 35 - 50 N·m

Cleat Entrapment Index

LowRisk

ACL / Meniscus strain factor

Surface Shear Traction

0.82µ

Slip prevention threshold: > 0.65

Selected: Midfield Between Hashes (50 Yard Line)

Primary high-wear pivot zone. Hybrid Bermuda 419 sodded base on silica sand rootzone.

PASS · APPROVED FOR PLAY

NFL & NFLPA International Field Surface Safety Framework

1. Clegg Impact Value (G-Max Standards)

The Clegg Impact Soil Tester drops a 2.25 kg missile from 450 mm. Under NFL Player Association safety accords (ASTM F1936), readings must remain below 100g on natural/hybrid sod, with extreme mandatory reconditioning if any zone approaches 110g. Excess hardness correlates with concussion velocity on helmet impact.

2. Rotational Shear & Joint Torque

Measured with an athletic stud disk weighted to 45 kg, rotating at 60°/sec. Optimal torque is 35 to 50 N·m. If torque exceeds 55 N·m (stud entrapment), the foot cannot rotate during change of direction, transferring torsion to the ACL. If below 30 N·m, severe traction loss occurs.

3. Stadium Transitions & Climate

When venues like Maracanã (Rio de Janeiro) host international NFL contests, field experts monitor microclimates, tropical humidity, and sod shear stability over 96+ hours prior to kickoff. Sub-base moisture and sand topdressing ensure uniform footing across hashes and numbers.