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<br />-23 - <br /> <br />lJ <br />1 <br /> <br />1 <br />~1 <br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />fill is properly compacted. However, slabs placed on clay soils <br />encrountered within the higher plateau area could heave and crack <br />should the clay be subjected to diange in rroisture content. This <br />potential would be greatest where the subgrade is inadvertently dried <br />or subsequently compacted. Where slabbnyrade construction is <br />required we suggest the following details to reduce potential Eor <br />damage in the event of movement: <br />1. On~ite clays encountered in the higher plateau area are not <br />well suited for use as fill beneath slab~n~rade floors. <br />Additional required fill should wnsist of low to non- <br />expansive material ccxrgaacted to at least 958 of standard <br />Proctor density (AS'LM D-698) at a ~roisture content near <br />optimum. <br />Prior to fill placement, the ground surface should be cleared <br />of all vegetation, topsoil acd any loose soil or uncompacted <br />fill. in the lower area along the river, the exposed <br />subgrade should be scarified 6 inches, moistened to near <br />optinuun and compacted. <br />2. All slabs should be separated from bearing members with a <br />positive expansion joint and adequately reinforced for the <br />proposed use. <br />3. Thickened slab sections or partition walls placed directly on <br />the slab can be user] in the lower area along the river with a <br />relatively low risk of differential movement. In the higher <br />plateau area the risk of movement will be muds greater for <br />slabs placed above the natural clay soils. This risk can be <br />1 <br />