FL Pre-Stress Precast Practice Questions - Florida Certified Structural Pre-Stress And Precast Specialty Contractor Examination Exam

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When pre-tensioned strands are released (detensioned), the concrete must have reached a minimum strength called the transfer strength. This is typically what percentage of the specified 28-day compressive strength?

Approximately 70 to 80 percent of the specified 28-day strength Exactly 50 percent of the 28-day strength 100 percent of the 28-day strength is always required before release There is no minimum; strands can be released at any age

Correct Answer:

Approximately 70 to 80 percent of the specified 28-day strength

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