Alabama Contractors License Practice Exam

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What is the minimum compressive strength for concrete used in precast foundations in psi?

  1. 2500

  2. 4000

  3. 5000

  4. 6000

The correct answer is: 4000

The requirement for a minimum compressive strength of 4000 psi for concrete used in precast foundations reflects industry standards and practices, ensuring that the concrete can withstand the structural loads and environmental conditions typically encountered in foundations. Concrete with this strength level provides a good balance of workability, durability, and resistance to cracking, which are vital characteristics for the longevity and safety of precast structures. This compressive strength is often stipulated in building codes and engineering guidelines to meet safety and performance criteria. Higher strengths, such as those found in the other choices, may be used for specialized applications or specific structural demands but are generally unnecessary for standard precast foundations, which is why 4000 psi is the minimum required strength.

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