ASTM C780
Full Name
ASTM C780 – Standard Test Method for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry
Scope
ASTM C780 outlines procedures for sampling and testing mortars, both before and during their use in construction. It focuses on evaluating the composition, plastic properties, and hardened properties of mortars intended for plain and reinforced unit masonry.
Key aspects of the scope include:
- Preconstruction evaluation: this allows for comparison of mortars made from different materials under simulated field conditions, and establishes baseline values for comparing against field-mixed mortars.
- Construction evaluation: this provides quality assurance for field-mixed mortars, including methods for verifying mix proportions, comparing results to preconstruction testing, and determining batch-to-batch uniformity.
- Composition and properties: the standard covers testing methods for determining mortar composition, consistency, water retention, air content, compressive strength, and bond strength.
- Limitations: it is important to note that test results obtained under ASTM C780 are not required to meet the minimum compressive strength values specified in ASTM C270.
Overall, ASTM C780 aims to:
- Ensure the quality and consistency of mortars used in masonry construction.
- Provide a framework for evaluating mortar properties and performance.
- Facilitate comparison between laboratory-prepared and field-mixed mortars.
It’s worth noting that ASTM C780 does not directly address the correlation between measured properties and the actual performance of mortars in masonry structures. However, the data obtained from the tests can be valuable for assessing mortar quality, identifying potential issues, and making informed decisions during construction.
ASTM C780 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C780 standard.
Contact us today to learn more about our testing capabilities and how we can support your business.
Resources
Keywords
mortars; sampling; testing; preconstruction; construction; evaluation; masonry; composition; properties; water retention; air content; compressive strength; bond strength; consistency