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D2995-23 – Standard Test Method Technical Guide
📋 Practice Overview
ASTM D2995‑23 outlines standard methods for estimating the transverse and longitudinal application rate and residual application rate of bituminous distributors. This practice is essential for quality control in pavement surface treatments. It covers both Option A (immediate weight measurement) and Option B (residual rate via oven drying for emulsified asphalts). Application rates are expressed in gallons per square yard or litres per square metre, with inch‑pound units as standard.
⚙️ Test Procedure and Key Specifications
The procedure requires pre‑weighed geotextile pads placed transversely across the roadway. After the distributor sprays, pads for Option A are immediately reweighed to determine asphalt weight. Option B involves oven‑drying pads to constant weight at 230 ± 9 °F (110 ± 5 °C) to find residual asphalt. A balance sensitive to 0.1 g is used, protected from wind by a weighing box. The geotextile pads must be at least 8 oz/yd² and measure 12 in × 12 in (304.8 mm × 304.8 mm).
| 🟦 Parameter | 📏 Requirement |
|---|---|
| Balance Sensitivity | 0.1 g |
| Oven Temperature (Option B) | 230 ± 9 °F (110 ± 5 °C) |
| Geotextile Pad Size | 12 in × 12 in (304.8 mm × 304.8 mm) |
| Pad Minimum Weight | 8 oz/yd² |
| Duct Tape Dimensions | 2 in × 6 in (50.8 mm × 152.4 mm) |
| Butcher Paper Width | 30 in (762 mm) |
Additional materials include aluminized duct tape for sealing and butcher paper for calibration protection.
📊 Calculation and Application
For Option A, the application rate is calculated from the weight gain per pad area. For Option B, the residual rate is based on the dried weight. Transverse rates are measured by placing pads end‑to‑end across the spray width. The practice helps evaluate uniformity and ensures correct binder application for durable pavements.
⚠️ Field Requirement: When performing Option A, a weighing box or balance shield is mandatory to protect the balance from wind, ensuring accurate measurements.