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The aggregate base material should conform to the specifications for Crushed Aggregate Base or <br />Crushed Miscellaneous Base (Standard Specifications for Public Works Construction —SSPWC <br />Section 200-2). The subgrade should achieve a minimum relative compaction of 90 percent. The <br />base material should be compacted to achieve a minimum relative compaction of 95 percent. Base <br />and subgrade materials should be moisture -conditioned to a relatively uniform moisture content at or <br />slightly over optimum. <br />Portland Cement Concrete Pavement <br />Portland Cement Concrete Pavement (PCCP) may be designed using a minimum of 8-inches of <br />Portland cement concrete over 6-inches of compacted aggregate base. The modulus of rupture of the <br />concrete should be a minimum of 500 pounds per square inch (psi) at 28 days. Contraction joints <br />should be placed at maximum 15-foot spacing. Where the outer edge of a concrete pavement connects <br />to an asphalt pavement, the concrete slab should be thickened by 50 percent at a taper not to exceed a <br />slope of 1 in 10. This section is only applicable for passenger car driveway areas and should be <br />thickened if heavy truck loading is anticipated. In addition, additional sections can be provided based <br />on other desired anticipated traffic loadings. <br />The aggregate base material should conform to the specifications for Crushed Aggregate Base or <br />Crushed Miscellaneous Base (Standard Specifications for Public Works Construction —SSPWC <br />Section 200-2). The subgrade should achieve a minimum relative compaction of 90 percent. The <br />base material should be compacted to achieve a minimum relative compaction of 95 percent. Base <br />and subgrade materials should be moisture -conditioned to a relatively uniform moisture content at or <br />slightly over optimum. <br />Vehicular Concrete Pavers <br />Vehicular pavers are typically 3-1/8 inches in thickness and are underlain by 1-inch of sand. <br />Based on ASCE 58-10 for interlocking pavers, considering a Traffic Index (TI) of 6 and an R-value <br />of 5 for the subgrade soils, we recommend the following base section underlying the proposed pavers. <br />The proposed pavers and sand should be underlain by a minimum of 18-inches of aggregate base. As <br />an alternative interlocking pavers and sand bedding can also be placed directly on the design asphaltic <br />concrete base course over aggregate base, considering a TI of 6, or can be placed on a minimum of 5- <br />inches of concrete over 6 inches of aggregate base. The design pavement sections provided herein are <br />considered suitable to support the imposed loads from a fire apparatus. <br />The aggregate base material should conform to the specifications for Crushed Aggregate Base or <br />Crushed Miscellaneous Base (Standard Specifications for Public Works Construction —SSPWC <br />Section 200-2). The subgrade should achieve a minimum relative compaction of 90 percent per <br />ASTM- D1557. The base material should be compacted to achieve a minimum relative compaction <br />of 95 percent. Base and subgrade materials should be moisture -conditioned to a relatively uniform <br />moisture content at or slightly over optimum. <br />Project i y 66n,61 18 — 838 1 3 , 2021 <br />