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D6236-11 – Standard Test Method Technical Guide
ASTM D6236-11 is a standard guide developed by Committee D18 on Soil and Rock for coring and logging soil-cement or lime-stabilized soil. It provides essential procedures for obtaining core samples from shallow stabilized layers to determine compressive strength, lift thickness, bond strength, and other physical properties. This guide is crucial for quality assurance in road and foundation construction.
📐 Scope and Specifications
This guide is applicable for shallow layers ranging from 0.3 to 3 m (1 to 10 ft) in thickness with soil particles less than 50 mm (2 in.) in diameter. It is designed for materials with a minimum compressive strength of 2100 kPa (300 psi). Weaker materials like cement-soil-bentonite mixtures or controlled low strength materials (CLSM) are excluded. All measured values must conform to the guidelines of Practice D6026 for significant digits and rounding. SI units are the standard.
| 🟦 Parameter | 📏 Value | 📐 Specification |
|---|---|---|
| Layer thickness | 0.3 to 3 m (1 to 10 ft) | Shallow layers |
| Maximum particle size | <50 mm (2 in.) | Soil aggregate diameter |
| Minimum compressive strength | 2100 kPa (300 psi) | For stabilized soil |
| Standard unit | SI units | Primary system |
⚙️ Coring Procedure and Equipment
The coring procedure involves extracting core samples using appropriate equipment that minimizes disturbance. The standard references Practices D4220 and D5079 for preserving and transporting soil and rock core samples. Additionally, D4452 for X-ray radiography can be used to evaluate internal conditions. Safety practices are highlighted in Section 8, and agencies should comply with Practice D3740 for testing and inspection.
📌 Practical tip: Use sharp coring bits and handle cores carefully to maintain sample integrity for accurate strength testing.
📊 Key Measured Properties
Core samples obtained are primarily used for compressive strength testing via D1633 for soil-cement and D5102 for soil-lime mixtures. Other key properties include bond strength between layers and lift thickness measurement. Durability tests such as wetting-drying (D559) and freezing-thawing (D560) are referenced but withdrawn. The guide ensures consistent evaluation through standardized procedures.
| 🎯 Property | 📏 Test Method | ⚡ Application | 🔍 Additional Notes |
|---|---|---|---|
| Compressive strength | D1633 | Soil-cement cylinders | Molded specimens |
| Compressive strength | D5102 | Soil-lime mixtures | Unconfined compression |
| Wetting-drying durability | D559 | Soil-cement mixtures | Withdrawn but used |
| Freezing-thawing durability | D560 | Soil-cement mixtures | Withdrawn but used |
| Bond strength | Various | Lift interface | Core testing |