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<br />4.7 - Concrete-Slab Riprap <br /> <br />Slabs of the dimensions and type, plain or reinforced, shown on the <br />plans are poured in place With class B concrete unless otherwise speci- <br />fied. Alternate slabs should be poured and the remaining panels should <br />be poured later (g, p. 266). <br /> <br />Unless otherwise specified, the slabs should be laid in horizontal <br />courses, and successive courses should break joints with the preceding <br />ones. Horizontal joints should be normal to the slope and should be cold <br />joints without filler. The joints extending up the slope should be formed <br />with 3/4-inch lumber, which should be removed and the joint left open. The <br />slabs should be tinished with a ....ood float. The pouring and curing should <br />be carried out as specified for class B concrete in reference 2. <br /> <br />4.8 - Filter Blanket <br /> <br />When required (section 2.7), a filter blanket should be placed on the <br />prepared slope or area to the full specified thickness of each layer in <br />one operation, using methods which will not cause segregation of particle <br />sizes within the bedding. Compaction of filter is not required, but the <br />surface at the finished layer should be reasonably even and free from <br />mounds or windrows. Additional layers of filter material, when required, <br />should be placed in the same manner, using methods which ....ill not cause <br />mixing of the materials in the different layers. <br /> <br />11-28 <br /> <br />,\ <br /> <br />1 <br />l <br />\ <br /> <br />= <br /> <br />I <br />A <br /> <br />t' <br /> <br />1 <br />. <br /> <br />l. <br /> <br />. <br /> <br />. <br />