ASTM C173
Full Name
ASTM C173 – Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
Scope
ASTM C173 is a standard that outlines the procedure for determining the air content of freshly mixed concrete using a volumetric air meter. This method is suitable for concrete containing any type of aggregate, whether dense, cellular, or lightweight.
The scope of ASTM C173 includes:
- Types of aggregate: the standard covers all types of aggregates, including dense, cellular, and lightweight aggregates.
- Principle: the method involves displacing the air in a known volume of concrete with a known volume of liquid and measuring the change in volume to calculate the air content.
- Apparatus: it specifies the apparatus required, including an air meter, a measuring bowl, a top section, a funnel, a strike-off bar, a tamper, a calibrated cup, and a syringe or measuring pipette.
- Calibration: it provides instructions for calibrating the air meter to ensure accurate results.
- Procedure: it details the step-by-step procedure for conducting the test, including mixing the concrete, placing it in the measuring bowl, adding the liquid, rolling and agitating the bowl, and reading the air content from the meter.
- Calculations: it provides formulas for calculating the air content based on the meter readings.
- Reporting: it outlines the information that should be included in the test report, such as the air content, type of aggregate, and any deviations from the standard procedure.
ASTM C173 does not cover:
- Air entrained in aggregate particles: the method measures the air content in the mortar fraction of the concrete, not the air trapped within porous aggregate particles.
- Precision and bias: the standard does not include information on the precision and bias of the test method.
This standard is essential for quality control in concrete production and construction, as the air content significantly affects the concrete’s properties, such as workability, strength, durability, and resistance to freeze-thaw cycles.
ASTM C173 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C173 standard.
Contact us today to discuss your specific testing needs and how our services can help you make informed decisions.
Resources
Keywords
air content; volumetric method; freshly mixed concrete; air meter; aggregate; calibration; pressure gauge; tamping rod