AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

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A crew finishes a tunnel invert and immediately lets a dry ventilation stream blow across the surface with no curing compound, mats, or water. What is the likely result?

Premature drying that reduces strength and increases shrinkage cracking An automatic increase in specified 28-day strength A lower water-cement ratio in the already-placed concrete No effect, because underground concrete never needs curing

Correct Answer:

Premature drying that reduces strength and increases shrinkage cracking

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