ASTM C207

Full Name

ASTM C207 – Standard Specification for Hydrated Lime for Masonry Purposes

Scope

ASTM C207 covers the requirements for hydrated lime used in various masonry applications. It encompasses four types of hydrated lime:

  1. Type N: Normal hydrated lime for general masonry purposes.
  2. Type S: Special hydrated lime with enhanced properties for specific applications.
  3. Type NA: Normal air-entraining hydrated lime for general masonry purposes with added air-entraining agents.
  4. Type SA: Special air-entraining hydrated lime with enhanced properties for specific applications and added air-entraining agents.

Types N and S are suitable for use in mortar, in scratch and brown coats of cement plaster, for stucco, and for addition to portland-cement concrete.

Types NA and SA are air-entrained hydrated limes that are suitable for use in any of the above uses where the inherent properties of lime and air-entrainment are desired.

The standard outlines the following aspects:

  • Chemical composition: specifies the acceptable ranges for calcium oxide (CaO), magnesium oxide (MgO), and carbon dioxide (CO2) content in each type of hydrated lime.
  • Fineness: defines the required fineness of hydrated lime, which affects its workability and performance in mortar and plaster.
  • Popping and pitting: specifies limits for popping and pitting, which are undesirable surface defects caused by the presence of unhydrated particles in the lime.
  • Water retention: sets requirements for water retention capacity, which is crucial for the proper hydration and workability of mortars and plasters.
  • Residue: limits the amount of residue after the lime is dissolved in water, ensuring a uniform and consistent product.
  • Air Entrainment (types NA and SA): specifies the air content requirements for air-entraining hydrated lime, which improves the workability, durability, and freeze-thaw resistance of mortars and plasters.

In summary, ASTM C207 provides a comprehensive framework for classifying, evaluating, and selecting hydrated lime suitable for various masonry applications, ensuring its quality and performance in mortars, plasters, stucco, and concrete.

ASTM C207 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C207 standard.

Contact us today to learn more about our testing capabilities and how we can support your business.

Resources

Keywords

hydrated lime; fineness; air permeability; hydraulic cement; Blaine apparatus; specific surface area; manometer; cell; plunger; porosity

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