Dry Sieve Test Method for Particle Size Distribution

Overview

• Method to determine particle size distribution of fine and coarse aggregates.
• Follows ASTM C136 standards.
• Involves separating a dry aggregate sample through sieves with varying openings.

Purpose

• Assess grading of materials for use as aggregates.
• Determine compliance with particle size distribution specifications.
• Provide data for quality control in aggregate production and mixtures.

Required Devices

• Balance/Scale:
  • Readability of 0.1 grams for fine aggregates.
  • Readability of 0.5 grams for coarse aggregates or mixtures.
• Test Sieves: Conform to ASTM E11 specifications.
• Mechanical Sieving Device: Creates particle motion.
• Oven: Maintains uniform temperature of 110°C.
• Other Tools:
  • Sieve brush
  • Sample container or pan
  • Sieve pan
  • Sieve stack cover
  • Data recording tools

Test Method

Preparation

1. Sample Preparation:
   • Bulk sample reduced to suitable test amount (ASTM C702).
2. Drying:
   • Dry sample in oven at 110°C.
3. Weighing:
   • Measure tare weight of container/pan.
   • Place sample in container and measure gross weight.

Sieve Selection and Setup

• Choose sieves with suitable openings per material specifications.
• Nest sieves from largest to smallest openings.
• Use Gilson 8-inch ASTM E11 stainless steel compliance sieves.
• Place sieve stack on sieve pan and cover.

Sieving Process

• Agitation:
  • Use mechanical device for adequate particle movement.
  • Eg: Gilson SS-15 shaker combines various motions.
• Duration:
  • Continue until less than 1% of material retained on any sieve passes in one minute.

Post-Sieving

• Measurement:
  • Record mass of each size increment to nearest 0.1 gram.
  • Check total mass against original sample mass (should match within 0.3%).

Data Analysis

• Record mass and percentage of material passing each sieve.
• Include mass and percentage of material retained.
• Determine particle size distribution for both test and bulk samples.

Support

• For questions or product support, contact Gilson Technical Support.

Note: If discrepancies in mass exceed 0.3%, repeat the test.