ASTM D698 Standard Proctor Test | Method B, Oversize Correction & Curve Explained

Описание: This video provides a complete step-by-step explanation of the ASTM D698 Standard Proctor test procedure, including Method B and oversize correction factor calculations.

ASTM D698 is the laboratory test used to determine the moisture-density relationship of soil under standard compactive effort. This Standard Proctor test establishes Maximum Dry Density (MDD) and Optimum Moisture Content (OMC), which are used to evaluate field compaction results.

In this training, we cover:

• What a Proctor curve is (in simple terms)
• Soil compaction theory and moisture-density relationship
• Representative sample preparation
• Air drying procedures per ASTM D698
• Sieve analysis and Method A / Method B determination
• When an oversize correction factor is required
• How to calculate percent retained
• Moisture content determination of coarse and fine fractions
• Running the Standard Proctor (5.5 lb rammer, 12-inch drop, 3 layers, 25 blows per layer)
• Plotting the Proctor curve
• Determining Maximum Dry Density and Optimum Moisture Content
• Applying oversize correction using specific gravity
• Corrected Maximum Dry Density calculation example

Example results shown in this video:
Uncorrected MDD = 102.1 pcf
Corrected MDD = 109.8 pcf

This video is designed for:

• Soil technicians
• Construction materials testing technicians
• Geotechnical laboratory personnel
• Civil engineers
• Inspectors performing compaction testing
• Anyone preparing for ACI, NICET, or field density certification

Understanding ASTM D698 and the Standard Proctor procedure is critical for accurate field density testing, percent compaction calculations, and construction quality control.

Every field density test depends on the accuracy of the Proctor curve.