Concrete Pressure Meter (Type B) for ASTM C231

Concrete Pressure Meter (Type B) – Air Content Test (ASTM C231)

The Concrete Pressure Meter (Type B) is a precision instrument used to measure air content in freshly mixed concrete. Accurate air entrainment is essential for concrete strength, durability, and freeze-thaw resistance. This Type B air meter is engineered to meet ASTM C231 and AASHTO T152 standards, making it a reliable choice for quality control professionals.

Certified MTP offers concrete air meters designed for accuracy, durability, and ease of use in both field and laboratory testing.

Why Air Content Testing Is Important

Entrained air improves concrete performance by increasing durability and resistance to cracking. Incorrect air levels can weaken concrete and reduce service life.

Using air content testing equipment ensures concrete mixes meet project specifications and industry requirements.

Key Features and Advantages

• Type B pressure meter for precise air content readings
• Stainless steel body for long-term durability
• Large, easy-to-read pressure gauge
• One-piece stainless steel clamps for a watertight seal
• Brass pump with extended stroke for faster pressurization
• Glass components for clear visibility and accuracy

These features reduce maintenance and improve reliability on job sites.

Product Specifications

• Height: 16 in
• Base Diameter: 10 in
• Weight: 20 lb
• Gauge Diameter: 4.5 in
• Handle Length: 6 in
• Materials: Stainless steel, brass, vinyl-coated handles

Built for repeated use in demanding concrete testing environments.

Meets Industry Test Standards

This air meter complies with:

• ASTM C231
• AASHTO T152

These standards define the pressure method for determining air content in freshly mixed concrete using normal-weight aggregates.

How the Type B Pressure Method Works

The pressure method measures air content by applying pressure to a sealed concrete sample and observing volume change.

Basic steps include:

• Compact the concrete sample using a tamping rod
• Strike off the surface evenly
• Seal the lid using stainless steel clamps and O-ring
• Build pressure using the brass pump
• Read air content directly from the gauge

This process is standard in concrete testing equipment used for production and inspection.

Benefits of Using a Type B Concrete Air Meter

• Accurate measurement of entrained air
• Supports ASTM and AASHTO compliance
• Improves concrete uniformity and durability
• Durable construction for long service life
• Easy operation for field and lab technicians

These benefits make it a must-have tool for concrete quality control.

Calibration and Maintenance

Routine calibration and maintenance help ensure consistent accuracy.

Best practices include:

• Calibrate using the supplied vessel and tubes
• Inspect the pressure gauge regularly
• Clean the chamber after each use
• Replace worn O-rings or valves promptly

Proper care extends equipment life and ensures dependable test results.

Limitations and Considerations

• Intended for freshly mixed concrete only
• Requires an aggregate correction factor
• Not suitable for lightweight or nonplastic concrete
• Results may differ from hardened concrete air content

Following ASTM procedures is critical for valid and repeatable results.

The Concrete Pressure Meter (Type B) is a reliable solution for measuring air content in fresh concrete using the ASTM C231 pressure method. Its durable construction, precise readings, and industry compliance make it an essential tool for contractors, inspectors, and testing laboratories focused on producing high-quality concrete.