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��8.B. - Page 134 5-Lot Residential Development December 9, 2010 <br /> � <br /> 1► <br /> relative cornpaction. Izx�port Aggregate Base, with an "R"-Value = 78 minim�, should <br /> be compacted to at least 95 percent relative compaction. Relative compaction values are <br /> based on the laboratory test procedure ASTM D 1557-9�. <br /> RECOMMENDED ALTERNATE ON-SITE ASPHALT PAV�MENT SECTIONS <br /> SUSGRADE D�SIGN R-VALUE 6(MEASURED)FOR NATIVE SO�L CONDITIQNS <br /> Tz'af�c Index: 4.0 4.5 5.0 5.5 <br /> AC thickness: 2.5 2.5 3.0 3.0 inches <br /> AB tk�ickness: 7.5 9.0 9.5 12.0 inches <br /> 2. Concrete - �f concrete drive�ray pavements are cons#nzcted, ti1Ey slzould be underlain by <br /> least si� inches af compacted Class 2 aggregate baserock. The aggregate baserock should <br /> be cozr�pacted �o at Ieast 95 percent relative cornpaction. Reinforcing of�iese exterior <br /> cancrete slabs-on-grade should include at least #3 bars on 18-inch�centers. Construction <br /> joints in concrete slab-on-grade units should be doweled. The final design of the slab <br /> refn#'arcing should be deternained by the proj ect structural engineer. <br /> Slabs-on-Grade and Exterior Flatwork <br /> l. Exterior flatwork should nave minimum thicknesses of 4 full inches and should be <br /> reinforced as dixected by the architec�/engineer. Due to the soil expansion potential, steel <br /> reinforceznent should be provided for exterior flatwork. <br /> 2. Exterior flatwork should be cast on a minim.uzn �-inch layer of corrxpacted, nonexpansive <br /> rr�ateria! such as clear� sax�d or aggregate base. A greater thzckness of nonexpaxzsive <br /> material wauld enhazlce flatwoz�k per�'orz�ance. Prior to placement o�the nonexpansive <br /> material, the �oil surface in the flatwork area should be above opti�num moisture content, <br /> and no desiccation cracks should be present. <br /> 3. Assuming that movernent (i.e., 1/�-inch or more) of e�terior flatwork beyond the structure <br /> is acceptable, the flatworic should be designed to be independent of the building <br /> foundations. The flatwork should not be doweled �o foundations, and a separator should <br /> be placed benveen t�e hx�o. <br /> 4. To reduce shrinkage cracks kn concxete, the concrete aggregates should be o�approp�riate <br /> size and proportian, the water/cement ratio shauld be low, the cancrete should be . <br /> properly placed and finish�d, contraction joints should be ins�alled, and the cancret� <br /> should be properly cured. Concrete materials, placeanent and curing specifications should <br /> 14 <br />