Cracking parallel to rebar in a concrete slab during humid conditions indicates which mechanism?

💡 Explanation

Reinforcement bars corrode because **alkali-silica reaction** forms gel which exerts internal pressure, causing cracking parallel to the rebar. Therefore, the correct answer is alkali-silica reaction expansion rather than general corrosion, due to expansive stress acting directly at the steel to concrete interface.

• Which outcome occurs when temperature affects ultrasonic robot sensors?
• Which control outcome occurs when a robotic arm surpasses its designated joint angle limit, processed by a PLC?
• Which electromagnetic interference increase arises from reflector dish deformation?
• Which effect arises when cryogenic propellant tank's **vaporizer valve** experiences rapid cycling?
• Which risk mostly increases when using improper preheating before welding high-carbon steel plates?
• Which outcome results when a circuit breaker with inverse-time characteristic trips in a high-humidity environment?