scope:

The mix proportions for the low strength concrete in this project were selected to obtain a low strength material in the 500 to 1500 psi (3.4 to 8.3 MPa) range. This level of strength makes it suitable as a low cost material for pipe bedding, utility duct envelopes, for filling over-excavated zones under structural foundations, as a high quality road base, and in similar applications. This material can serve as a non-structural material at a cost lower than normal structural concrete in applications where lower strengths are adequate. The material should not be used for above grade applications without being properly protected, i.e., covered, since it does not possess qualities that make it durable against freeze-thaw and abrasion exposure.