Construction Health and Safety Technician (CHST) 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 460

A steel-erection contractor shall not operate unless it has received written notification that the concrete has attained___ percent of the intended minimum compressive design strength.

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The correct answer is 75 percent because the regulations surrounding steel erection work are designed to ensure safety and structural integrity. The requirement for the concrete to have attained at least 75 percent of its intended minimum compressive design strength before steel erections begin is a precautionary measure. This percentage ensures that the concrete can adequately support the loads imposed by the steel structure, thereby minimizing the risk of structural failure during the critical phases of construction.

Ensuring that the concrete has reached this level of strength is crucial for maintaining the stability of the construction site and preventing accidents that can arise from moving heavy steel into place on insufficiently cured concrete. This requirement is based on engineering principles and safety standards that prioritize the well-being of workers and the integrity of the structure being built.

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