In short, the concrete must be resistant to the environment in which it is placed. Expected Loads Depending on the breadth of the definitions, either structural or environmental considerations could easily include the loads to which a structure will be subject, and I would not argue with either interpretation. Because of its importance, however, I have chosen to break loading out separately for clarity in discussion. As with the two previous factors, the influence, or impact of load on performance can vary widely. However, for buildings the engineer must consider much different loads, including those from wind or earthquakes.
Marine structures present still another set of conditions and requirements.
The loads may be compressive, flexural or tensile, or include multiple types. In short, the type, magnitude and number of expected loads must be carefully considered. Other Factors Beyond the three basic influences discussed above, additional factors must also be considered. It must maintain this plasticity for the time period necessary to transport, place and consolidate the concrete. Any desired concrete properties, such as the entrained air void system, must not be adversely affected by transport, placement or consolidation.