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D6024 – Standard Test Method Technical Guide
📐 Scope and Applicability
ASTM D6024/D6024M specifies a ball drop test for Controlled Low Strength Material (CLSM) to evaluate its ability to withstand loading. The method involves repeatedly dropping a metal weight onto in-place material. CLSM is also known as flowable fill, controlled density fill, soil‑cement slurry, or unshrinkable fill. The standard requires inch‑pound or SI units to be used independently per Practice D6026; values in each system are not exact equivalents. All observed and calculated data must conform to the significant‑digit and rounding rules of Practice D6026.
⚠️ The test is intended for load‑suitability assessment only; it does not address long‑term performance or other engineering design factors.
⚙️ Test Equipment and Procedure
The principal equipment is a metal weight that is dropped repeatedly onto the CLSM surface. The procedure follows industry standards for density, yield, and air content (D6023) and flow consistency (D6103). No specific drop mass or height is prescribed; the method emphasizes consistent impact energy application. The user is responsible for establishing appropriate safety, health, and environmental practices, as the standard does not cover all potential hazards.
💡 Safety measures must be determined by the user; regulatory limits should be checked before starting the test.
📊 Key Terminology and Referenced Documents
Key definitions are provided in Terminology C125 (Concrete and Concrete Aggregates) and D653 (Soil, Rock, and Contained Fluids). The standard references several companion ASTM methods to ensure consistent test conditions and data handling. Practice D6026 provides essential guidance for significant digits and data records in geotechnical work.
| 🟦 Standard | 📏 Full Title |
|---|---|
| D6026 | Practice for Using Significant Digits and Data Records in Geotechnical Data |
| D6103/D6103M | Test Method for Flow Consistency of Controlled Low Strength Material (CLSM) |
| D6023 | Test Method for Density (Unit Weight), Yield, Cement Content, and Air Content (Gravimetric) of CLSM |
❓ Frequently Asked Questions
🔍 What does the ball drop test measure?
It measures the ability of CLSM to withstand loading by repeatedly dropping a metal weight onto the in‑place material, indicating suitability for load application.
It measures the ability of CLSM to withstand loading by repeatedly dropping a metal weight onto the in‑place material, indicating suitability for load application.
💡 How are units handled in this standard?
Inch‑pound or SI units are stated separately and must be used independently; combining values from both systems may lead to nonconformance.
Inch‑pound or SI units are stated separately and must be used independently; combining values from both systems may lead to nonconformance.
⚡ What safety concerns are addressed?
The standard does not address all safety issues. Users must establish appropriate safety, health, and environmental practices and apply applicable regulatory limits.
The standard does not address all safety issues. Users must establish appropriate safety, health, and environmental practices and apply applicable regulatory limits.
📌 Which standards are directly referenced?
Key references include C125, D653, D3740, D4832/D4832M, D6023, D6026, and D6103/D6103M for terminology, testing, and data handling.
Key references include C125, D653, D3740, D4832/D4832M, D6023, D6026, and D6103/D6103M for terminology, testing, and data handling.