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6.5- Geotechnical Stability Exhibit <br />Further, we specify concrete with a 28-day compressive strength of 3,000 psi, and <br />grade 40 reinforcing steel. <br />Assumptions <br />The bearing capacity of the underlying soil is unknown. Consequently, we have made <br />assumptions about the slab's support conditions. For positive reinforcement, the slab is <br />treated as a simple span. However, for negative reinforcement, the outer'/< of the slab <br />is treated as a cantilever. <br />Methodology <br />Maximum positive moments were found when a concentrated 32 kip load was applied at <br />mid-span (10 feet longitudinally, 7.5 feet transversely). Maximum negative moments <br />resulted from the application of 16 kip concentrated loads at the slab edge, and another <br />16 kip concentrated load six feet from the edge. <br />Moments due to dead loads have not been included in the calculations because <br />although the soil's bearing capacity is not known, it can be safely assumed adequate to <br />support the weight of the concrete slab and asphalt overlay. <br />Results and Conclusions <br />The reinforced concrete slab will have greater rigidity than the additional four feet of fill <br />material, and will therefore be able to protect the underlying pipe by distributing sub- <br />grade shear and compressive stresses over a greater area. <br />