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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 26 <br />10.2 RIGID PAVEMENTS <br /> <br />Use concrete pavement sections to resist heavy loads and turning forces in areas such as fire <br />lanes or trash enclosures. Final design of rigid pavement sections, and accompanying <br />reinforcement, should be performed based on estimated traffic loads and frequencies. We <br />recommend the following minimum design sections for rigid pavements: <br /> <br />„ Use a minimum section of 6 inches of Portland Cement concrete over 4 inches of Caltrans <br />Class 2 Aggregate Base. <br /> <br />„ Concrete pavement should have a minimum 28-day compressive strength of 3,500 psi. <br /> <br />„ Provide minimum control joint spacing in accordance with Portland Cement Association <br />guidelines. <br /> <br />10.3 SUBGRADE AND AGGREGATE BASE COMPACTION <br /> <br />Compact finish subgrade and aggregate base in accordance with Section 4.5.1. Aggregate Base <br />should meet the requirements for ¾ -inch maximum Class 2 AB per section 26-1.02a of the latest <br />Caltrans Standard Specifications. <br /> <br />10.4 CUT-OFF CURBS <br /> <br />Saturated pavement subgrade or aggregate base can cause premature failure or increased <br />maintenance of asphalt concrete pavements. This condition often occurs where landscape areas <br />directly abut pavements. If increased protection against saturated subgrade or aggregate base is <br />desired, construct concrete cut-off curbs where pavements abut landscape areas. Extend the <br />curbs at least 4 inches into the subgrade below the aggregate base course level. <br />