ASTM C279-23 PDF

Overview

ASTM C279-23 - Standard Specification for Chemical-Resistant Masonry Units defines the requirements for solid, kiln-fired bricks and tiles manufactured from clay, shale, or their mixtures. These chemical-resistant masonry units are designed for both indoor and outdoor applications where exposure to harsh chemical environments and thermal shock resistance is required. The standard supports the performance and durability of masonry construction in environments subject to chemical attack, specifying rigorous test methods and quality criteria to ensure that materials meet demanding construction needs.

Key Topics

• Types and Classification: ASTM C279-23 classifies chemical-resistant bricks and tiles into three types based on their absorption and acid resistance:

  • Type I: For environments where low absorption and high acid resistance are not critical.
  • Type II: For applications needing lower absorption and enhanced acid resistance.
  • Type III: For the most demanding situations requiring minimum absorption and maximum acid resistance. These are further divided into:
  • Class S: Standard dimensional tolerance.
  • Class X: Stricter, high-precision dimensional tolerance.

• Physical and Chemical Requirements:

  • Modulus of Rupture (Flexural Strength): Units must meet specified strength levels.
  • Water Absorption: Limits are set based on type for resistance to liquid penetration.
  • Sulfuric Acid Solubility: Bricks and tiles must demonstrate minimal weight loss when tested for acid resistance.
  • Dimensional Accuracy & Warpage: Strict tolerances based on the intended application class.
  • Surface Texture & Finish: Units must be free of defects that could impair performance.

• Testing and Sampling: Consistent application of ASTM test methods, such as for porosity and absorption (ASTM C20), flexural strength (ASTM C67/C67M), and acid solubility, ensures results are reliable and comparable.

Applications

Chemical-resistant masonry units manufactured to ASTM C279-23 are essential in a range of environments where building materials must withstand exposure to chemicals, acids, and thermal cycling. Practical applications include:

• Industrial Facilities: Acid storage tanks, chemical processing plants, and battery rooms, where masonry must resist corrosive attack.
• Laboratory Spaces: Floors, walls, and other surfaces exposed to chemicals.
• Food and Beverage Processing: Environments requiring both hygiene and resistance to cleaning chemicals.
• Water Treatment Plants: Areas exposed to aggressive substances and cleaning protocols.
• Outdoor Installations: Where weather resistance and occasional chemical exposure are concerns.

These units are typically installed using chemical-resistant mortars, further enhancing their performance in aggressive environments.

Related Standards

To assure comprehensive compliance and performance, ASTM C279-23 references several associated standards and terminology:

• ASTM C20: Test Methods for Apparent Porosity, Water Absorption, Apparent Specific Gravity, and Bulk Density of Burned Refractory Brick and Shapes by Boiling Water
• ASTM C67/C67M: Test Methods for Sampling and Testing Brick and Structural Clay Tile, including flexural strength and durability assessments
• ASTM C1232: Terminology for Masonry, providing authoritative definitions
• ASTM E11: Specification for Woven Wire Test Sieve Cloth and Test Sieves, ensuring consistency in particle size assessments

For those specifying, purchasing, or inspecting chemical-resistant masonry units, ASTM C279-23 provides a reliable, internationally recognized benchmark to ensure materials perform as expected in challenging chemical environments.

Keywords: ASTM C279-23, chemical-resistant masonry units, acid-resistant bricks, chemical environment masonry, water absorption, sulfuric acid solubility, flexural strength, industrial masonry, chemical-resistant tile