ASTM C270

Full Name

ASTM C270 – Standard Specification for Mortar for Unit Masonry

Scope

ASTM C270 outlines the requirements for mortar used in the construction of non-reinforced and reinforced unit masonry structures. It covers different types of mortars and their properties to ensure their suitability for various masonry applications.

The scope of ASTM C270 includes:

  • Mortar types: the standard defines five types of mortar (M, S, N, O, and K), each with specific proportions and properties tailored for different uses in masonry construction. The types are based on their compressive strength, with Type M being the strongest and Type K the weakest.
  • Material requirements: it specifies the materials that can be used in mortar, including Portland cement, hydrated lime, masonry cement, mortar cement, aggregates, and water. It also outlines requirements for their quality and proportions.
  • Properties: the standard specifies requirements for various properties of mortar, including compressive strength, air content, and water retention. These properties are essential for the performance and durability of the masonry structure.
  • Sampling and testing: it provides guidelines for sampling and testing mortar to ensure compliance with the specified requirements.
  • Proportion specifications and property specifications – the standard provides two methods for specifying mortar:
    1. Proportion specifications: specify the proportions of cement, lime, and sand to be used.
    2. Property specifications: specify the properties of the mortar, such as compressive strength and air content.

It’s important to note that ASTM C270 does not cover the design and construction of masonry structures, which are addressed in other standards and building codes.

ASTM C270 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C270 standard.

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

Resources

Keywords

mortar; masonry; portland cement; lime; sand; compressive strength; air content; water retention; type M; type S; type N; type O

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