ASTM C786/C786M
Standard Test Method for Fineness of Hydraulic Cement and Raw Materials by the 300-μm (No. 50), 150-μm (No. 100), and 75-μm (No. 200) Sieves by Wet Methods
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About This Item
ASTM C786/C786M is the ASTM standard for determining the fineness of hydraulic cement and raw materials by wet sieving through the 300-μm (No. 50), 150-μm (No. 100), and 75-μm (No. 200) sieves. It provides a structured test method for evaluating how much material remains on or passes through these sieve sizes, helping users compare fineness in a consistent way. For laboratories and quality programs, this standard supports more reliable testing and product evaluation.
Purpose of ASTM C786/C786M
The purpose of this method is to measure fineness in hydraulic cement and related raw materials using wet sieve procedures. By focusing on three specified sieve sizes, the standard gives a repeatable approach for assessing material particle distribution at coarse-to-fine levels. ASTM C786/C786M is useful when a controlled test method is needed to support material characterization, quality control, and comparison of test results across batches, suppliers, or production runs.
Common use cases of ASTM C786/C786M
This standard is commonly used in cement testing laboratories and other technical settings where hydraulic cement or its raw materials are examined for fineness. It may support incoming material checks, production monitoring, and routine quality assurance workflows. ASTM C786/C786M is also relevant when sieve-based wet methods are preferred for evaluating material consistency and when documentation of test conditions and results is needed for internal review or specification compliance.
Why ASTM C786/C786M matters
Fineness can influence how a cementitious material is evaluated and how consistent it appears from one lot to another. ASTM C786/C786M matters because it offers a recognized test method that helps reduce variability in laboratory practice and supports more dependable decision-making. For procurement, quality control, and technical acceptance, having a standard approach can improve confidence in results and make comparisons more meaningful across materials and test programs.
- Wet sieve test method
- Hydraulic cement and raw materials
- 300-μm, 150-μm, and 75-μm sieves
- Fineness evaluation support
- Quality control and comparison testing
- Publication Date: 2025-04-11
- Publisher: ASTM
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