Concrete specimens should be prepared for testing by storing them in a controlled environment per standards because this practice ensures that the specimens cure properly and maintain the appropriate temperature and humidity levels. Proper curing conditions are essential for achieving the desired strength and durability characteristics of the concrete.
The recommended environment typically involves keeping the specimens at a consistent temperature around 20°C (68°F) with adequate moisture to prevent them from drying out too quickly, which could lead to surface cracking or uneven strength development. Standards, such as those from ASTM or ACI, provide detailed guidance on the acceptable curing practices.
While soaking in water can be a part of the curing process, it is not adequate as the sole preparation method for testing and may not be suitable for all types of concrete mixtures. Drying specimens in the sun can lead to rapid evaporation, which is detrimental to the curing process. Removing external pieces may be necessary in certain contexts, but it does not directly relate to the overall proper preparation and curing that is critical for testing the strength of concrete samples. Therefore, adhering to controlled environment storage is the best practice to ensure reliable test results.