ASTM C136 Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

Get Certified ASTM C136 for Uncompromising Quality and Project Success

ASTM C136 certification helps ensure laboratories and construction facilities follow specific guidelines when sorting aggregate gradation. Certification ensures sieving procedures, equipment calibration, and reporting follow internationally accepted standards to deliver accurate, consistent results. Using ASTM C136-certified practices helps companies ensure consistent aggregate quality, reduce mix variability, and avoid concrete and asphalt failures. ASTM C136 (Standard Test Method for sieve analysis of fine and coarse aggregates) is a standard test method for determining the particle-size distribution of fine and coarse aggregates by sieving.

• Determines particle-size distribution by sieve analysis for fine aggregates and coarse aggregates.
• Evaluates mixtures of fine and coarse aggregates and determines the percentage passing each sieve.
• Determines the percentage retained on each sieve and supports aggregate grading evaluation.
• Provides data for production quality control and helps compare aggregate grading with specification requirements.

What are the uses of ASTM C136 testing? 

ASTM C136 testing helps laboratories determine the grading characteristics of aggregates used in construction materials. Engineers and manufacturers use the results to assess aggregate consistency and check against relevant grading specifications. The test can also support production control and the development of aggregate mixtures.

The uses include:

• Determines aggregate particle-size distribution, fine aggregate grading, and coarse aggregate grading.
• Checks aggregate compliance with grading requirements and supports quality control during aggregate production.
• Provides percentage passing and retained data and evaluates aggregate mixtures containing fine and coarse fractions.
• Supports evaluation of particle packing and porosity and provides data for aggregate selection and mixture development.

Which Materials Can Be Tested Under ASTM C136? 

ASTM C136 applies to fine aggregate, coarse aggregate, and combinations of fine aggregate and coarse aggregate. Analysts obtain representative aggregate samples and determine the sieve sizes needed to produce the particle-size data required by the specification.

Why is ASTM C136 important?

ASTM C136 outlines a uniform method of determining aggregate grading by sieve analysis. Particle-size distribution influences how aggregate particles pack together and affects the characteristics of aggregate products and mixtures. By determining the amount of material retained on and passing through individual sieves, laboratories can compare aggregate grading with specification requirements and identify production variations.

ASTM C136 Testing Process and Data Collection 

Technicians first collect a representative aggregate sample and then reduce it to the test quantity. Technicians dry and weigh the sample, select the appropriate sieve series, and stack the sieves from the widest opening to the narrowest. They then place the aggregate on the upper sieve and mechanically or manually agitate the sieve stack. Technicians measure the mass after sieving. The laboratory compares the recovered mass with the original sample mass and determines the percentage retained and percentage passing on each sieve. If necessary, technicians measure the fineness modulus.

Common Challenges and Troubleshooting 

To ensure accurate sieve analysis, use representative sampling, appropriate sample masses, appropriate sieves, proper sieving, and accurate weighing. Common challenges include incorrect sample reduction, inadequate drying, incorrect sieve selection, overloading individual sieves, insufficient sieving time, inaccurate balance readings, and aggregate loss during transfer. Technicians should control the sample preparation process, use calibrated balances and appropriate sieves, prevent excessive material on any one sieve, and ensure the sieving process reaches the endpoint.