North Carolina Building Contractor License Practice Exam

What characteristic does ASTM mortar type have compared to other mortar types?

1. Lower compressive strength

2. Less durability

3. Higher compressive strength

4. Cheaper cost

The correct answer is: Higher compressive strength

The characteristic that distinguishes ASTM mortar types from others is their higher compressive strength. ASTM, which stands for the American Society for Testing and Materials, establishes standards for various building materials, including mortar. The different types of mortar are classified based on their compressive strength, which is a measure of the mortar's ability to withstand loads without failure. Mortars classified under ASTM standards typically indicate a clear range of compressive strengths, which aids in selecting the appropriate type for specific applications. Higher compressive strength allows for better structural integrity and durability in construction projects, making these mortars suitable for load-bearing walls and other critical applications. In contrast, mortars with lower compressive strength may not offer the same level of performance in demanding structures, and options focused on cost may compromise the quality inherent in ASTM types. Thus, recognizing that the ASTM mortar types generally have a higher compressive strength is essential for ensuring the structural safety and longevity of the built environment.