What procedure in foundation work eliminates concerns about foundation shrinkage and provides space for shimming to elevation?

The procedure that addresses foundation shrinkage while allowing for shimming to achieve the desired elevation is pouring to a minus elevation. This method involves constructing the foundation slightly lower than the final required height. As the poured concrete hardens, it may experience some shrinkage. However, by starting with a lower elevation, there is still sufficient material available to adjust the final height using shimming techniques. This ensures that machinery and equipment can be aligned precisely without being compromised by the natural shrinkage that can occur as concrete cures.

This technique is particularly useful in situations where the precise level of the foundation is critical, as it allows for adjustments after the initial pour, accommodating any shrinkage that might happen post-curing. Moreover, it aids in achieving the proper operational elevation for installed machinery or structures, which is crucial for their efficiency and functionality.

In contrast, pouring with additives may enhance certain properties of concrete but does not specifically address the issue of elevation adjustments or shrinkage. Pouring grout with concrete is a different procedure that relates to filling voids and does not deal specifically with the foundational elevation process. Pre-installing anchor bolts can be very important for securing equipment but does not provide a solution to the concerns over shrinkage or the need for height adjustments.