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<br /> <br />ASSOCIATED SOILS ENGINEERING, INC. Project No.: 7160.23 <br />2860 Walnut Avenue, Signal Hill CA 90755 January 23, 2024 <br />Tel: (562) 426 -7990 * Fax: (562) 426 -1842 Page 22 <br />The slab subgrade soils should also be proof-rolled just prior to construction to provide a firm, unyielding <br />surface, especially if the subgrade has been disturbed or loosened by the passage of construction traffic. <br />Final compaction and testing of slab subgrade should be performed just prior to placement of concrete. <br /> <br />Exterior slabs should be properly jointed to limit the number of concrete shrinkage cracks. For long/thin <br />sections, such as sidewalks, expansion or control joints should be provided at spacing intervals equal to the <br />width of the section. Slabs between 5 and 10 feet in minimum dimension should have a control joint at <br />centerline. Slabs greater than 10 feet in minimum dimension should have joints such that unjointed <br />sections do not exceed 10 feet in maximum dimension. Where flatwork adjoins structures, it is <br />recommended that a foam joint or similar expansion material be utilized. Joint depth and spacing should <br />conform to the ACI recommendations. It is, however, cautioned that uneven heaving of exterior slabs may <br />develop in the future when prolonged irrigation or seepage permeates the subgrade soil, especially in areas <br />that expansive soil pockets exist due to inadequate control or inspection of earthwork construction. <br /> <br />5.5 Asphaltic Concrete (AC) Flexural Pavement Design <br />The finish subgrade within the new pavement areas on Site is anticipated to be underlain by compacted <br />structural fill as per stipulated in Section 5.2.3b) above. For preliminary pavement design purposes, a <br />conservative R-Value of 25 has been utilized considering the observed heterogenic silty sand and sandy silt <br />site soils. The AC pavement analyses were performed based on procedures stipulated in the current edition <br />of the Caltrans Highway Design Manual. By assuming compliance with site preparation recommendations <br />aforementioned in Sections 5.1.1 through 5.2.6, ASE recommends that the following AC pavement <br />structural sections be considered. However, local government authority should be consulted for minimum <br />pavement section requirements and, if more stringent than that recommended by ASE, be complied with. <br />(1) Asphaltic Concrete <br />(2) CAB per the Greenbook Section 200-2.2, compacted at least 95% relative compaction <br />(3) Upper 6 inches of subgrade soils to be compacted to a minimum 95% relative compaction <br /> <br />It is recommended that R-Value testing be performed on representative soil samples after subgrade <br />preparation on the upper 2 feet to confirm/modify applicability of the above pavement sections. <br /> <br />Traffic <br />Index <br />(TI) <br />Pavement Section Alternatives <br />Remark AC (1) <br />(inches) <br />AB (2) <br />(inches) <br />Full Depth <br />AC (3) <br />(inches) <br />4.5 3.0 5.0 5.5 For auto parking stalls. <br />5.5 3.0 8.5 7.0 For auto circulation aisles. 4.0 6.0 <br />7.0 4.0 11.0 9.5 For fire lanes and truck access ways/entry and exits. 5.0 9.0