Sustainable concrete is becoming more popular than green concrete because it includes useful service over a long time. In the case of floors and pavement, the concrete must stand up, to the service needs of an application for a long period of time, with minimal repair expenses.rnBut sustainable concrete is only half the story, the subgrade it rests on has much to do with its service life. When the subgrade under a slab fails inside a building or outside in the parking lot, so does the concrete.rnThe word "subgrade" refers to the soil below the subbase. The subbase is the finely graded compactable material between the subgrade and the concrete. Geotechnical engineers typically are contracted by owners to evaluate soil conditions on a construction site and sometimes they specify the subbase fill materials to be used and how they should be placed. But structural engineers hired by owners to design floors and pavements also get involved in the specifications for subbase materials as part of the concrete system.
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