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KLE/NFELOER <br /> \\ J/Bright People.RIghY So7etFons. <br /> V <br /> effective, edge barriers, such as concrete curbs, polyethylene membranes and the like, <br /> should be placed that extend a minimum of 4 inches below the aggregate base and into <br /> the subgrade soil. Additional details regarding these systems can be provided upon <br /> request. <br /> • Periodic maintenance should be performed to repair degraded areas and seal cracks with <br /> appropriate filler. <br /> 5.9 PORTLAND CEMENT CONCRETE PAVEMENTS <br /> 5.9.1 Subgrade Preparation <br /> Following site stripping, all subgrade soils to support Portland cement concrete pavements should <br /> be in accordance with Section 5.8.1. <br /> 5.9.2 Pavement Sections <br /> Portland cement concrete pavements are typically better able to resist the intense stresses <br /> induced in pavements by heavy loading and the turning motions of vehicles. Concrete pavements <br /> should be used in areas frequented by such vehicles as well as in driveway and entry aprons. <br /> Concrete pavement sections presented in Table 5-6 are based on current Portland Cement <br /> Association (PCA)design procedures, traffic indices of 5 and 8, and the assumptions listed below. <br /> These assumptions should be reviewed by the project Owner, Architect, and/or Civil Engineer to <br /> evaluate their suitability for this project. Changes in the assumptions will affect the corresponding <br /> pavement section. <br /> • Modulus of subgrade reaction for untreated soil = 50 psi/in <br /> • Modulus of subgrade reaction for lime-treated soil = 150 psi/in <br /> • Modulus of rupture of concrete = 550 psi (For Concrete Compressive Strength of 4,000 <br /> psi) <br /> • Aggregate Interlock Joints <br /> • Perimeter curbing <br /> • Load Safety Factor= 1.1 <br /> 20210067.001A/ST020R111447 Page 29 of 37 May 11, 2020 <br /> ©2020 Kleinfelder www.kleinfelder.com <br />