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2016SpringShotcreteEMag

Nozzleman Knowledge • Limit rapid temperature changes particularly before the concrete has developed sufficient strength to withstand induced thermal stresses; and • Provide protection consistent with the intended serviceability of the structure. The actual temperatures of the concrete surface determine the effectiveness of protection regardless of the ambient temperature. Therefore, it is desirable to monitor and record the concrete temperature at the surface of the concrete (Fig. 4). During the temperature recording and monitoring process, consider the following: • Concrete corners and edges are vulnerable to freezing and are usually more difficult to maintain at required temperatures; • Maintain the internal temperature of concrete to ensure that excessive heating does not occur; • Inspection personnel should record the date; time; outside air temperatures; temperature of Fig. 3: Blankets and thermometers were placed on the concrete surface to monitor the temperatures through the cool night and curing period Fig. 4: Winter protection for the Volcano skin repair. Temperatures were kept between 47 and 50°F (8 and 10°C) on both sides of the shell. Concrete blankets were placed as added protection. Compression Strengths exceeded the specification for 7 and 28 days. Kings Dominion (Doswell, VA,) November 1, 2015 to March 15, 2016 52 Shotcrete • Spring 2016


2016SpringShotcreteEMag
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