ASTM C141/C141M-14(2022)

Overview

ASTM C141/C141M-14(2022): Standard Specification for Hydrated Hydraulic Lime for Structural Purposes establishes the requirements for hydraulic hydrated lime intended for use in structural applications. Issued by ASTM International, this standard ensures that products meet strict chemical, physical, and performance criteria, supporting their safe and effective use in construction. Hydrated hydraulic lime as specified in this standard is widely utilized in plaster, stucco, masonry mortar, and as an admixture in Portland-cement concrete, providing durability and versatility in building materials.

Key Topics

• Scope of the Standard

  • Applies to hydrated hydraulic lime used for structural purposes in various construction materials.
  • Specifies criteria for both SI and inch-pound units, emphasizing their separate usage.
  • Addresses user responsibilities regarding safety, health, and environmental practices when handling and testing the material.

• Product Definition and Characteristics

  • Hydraulic hydrated lime: Produced by slaking hydraulic quicklime to a powder, capable of hardening under water and air.
  • Essential properties include long working time, reworkability, and compatibility with traditional building materials.

• Chemical Composition and Requirements

  • Establishes limits for calcium oxide, magnesium oxide, silica, iron oxide, aluminum oxide, and carbon dioxide to ensure product quality.

• Testing and Quality Assurance

  • Requires stringent laboratory testing for:
    • Chemical composition
    • Fineness
    • Normal consistency
    • Time of setting
    • Autoclave expansion
    • Compressive strength
    • Reworkability
  • Employs referenced ASTM test methods such as ASTM C25, C109/C109M, C110, C187, C191, and others for robust evaluation.

• Packaging, Sampling, and Inspection

  • Details protocols for sampling, packaging, inspection, marking, and rejection to maintain integrity throughout the supply chain.

Applications

Hydrated hydraulic lime conforming to ASTM C141/C141M-14(2022) is essential in a variety of construction and restoration projects, including:

• Plaster and Stucco Applications
  • Used in the scratch or brown coats, where its setting properties and reworkability are advantageous.
• Masonry Mortar
  • Improves workability, bond strength, and longevity in mortars for brick, block, and stone masonry.
• Portland-Cement Concrete
  • Acts as a blend, amendment, or admixture to enhance durability, flexibility, and compatibility with traditional and modern construction techniques.
• Restoration and Conservation
  • Favored in historic and heritage conservation due to its breathability and material compatibility.

Related Standards

Several ASTM standards are referenced and align with the requirements of C141/C141M-14(2022), including:

• ASTM C25: Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
• ASTM C51: Terminology Relating to Lime and Limestone
• ASTM C109/C109M: Test Method for Compressive Strength of Hydraulic Cement Mortars
• ASTM C110: Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone
• ASTM C187 and C191: Test Methods for Consistency and Setting Time of Hydraulic Cement Paste
• ASTM C230/C230M: Specification for Flow Table for Hydraulic Cement Tests
• ASTM C270: Specification for Mortar for Unit Masonry
• ASTM C305: Practice for Mechanical Mixing of Hydraulic Cement Mortars
• ASTM C778: Specification for Standard Sand
• ASTM C1271 and C1301: Test Methods for Analyzing Major and Trace Elements in Lime and Limestone

Keywords

hydrated hydraulic lime, ASTM C141, masonry mortar, structural lime, plaster, stucco, Portland-cement concrete, construction materials, standard specification, quality assurance

By adhering to ASTM C141/C141M-14(2022), manufacturers, builders, and restoration experts ensure the consistent quality and performance of hydrated hydraulic lime in a range of structural and architectural applications.