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M98168GE • • <br />6.0 INTERIOR FLOOR SLAB DISCUSSION <br />It is our understanding that, as currently planned, the <br />processing plant building floor will be a concrete slab-on-grade <br />floor. The natural soils that will support interior floor slabs <br />are stable at their natural moisture content. However, the owner <br />should realize that when wetted, the site soils may experience <br />volume changes. <br />Concrete flatwork, such as concrete slab-on-grade floors, should <br />be underlain by compacted structural fill. The layer of compacted <br />fill should be at least one (1) foot thick or thicker and con- <br />structed as discussed under COMPACTED STRUCTURAL FILL below. A one <br />(1) foot thick blanket of structural fill material beneath the <br />concrete flatwork is not sufficient to entirely mask the settlement <br />potential of the subgrade soil material but will provide better <br />subgrade conditions for construction. <br />The natural soil materials exposed in the areas supporting <br />concrete slab-on-grade floors should be kept moist during <br />construction prior to placement of concrete slab-on-grade floors. <br />This is to help ~aaintain the moisture regime of the site soils <br />supporting floor slabs. We are available to discuss this concept <br />with you. <br />Concrete slab-on-grade floors should be provided with a positive <br />separation, such as a slip joint, from all bearing members and <br />utility lines to allow their independent movements and to help <br />reduce possible damage that could be caused by movement of soils <br />supporting interior slabs. The floor slab should be constructed as <br />a floating slab. All water and sewer pipe lines should be isolated <br />from the slab. Any equipment placed on the floating floor slab <br />should be constructed with flexible joints to accommodate future <br />movement of the floor slab with respect to the structure. We <br />suggest partitions constructed on the concrete slab-on-grade floors <br />be provided with a void space above or below the partitions to <br />relieve stresses induced by elevation changes in the floor slab. <br />The concrete slabs should be scored or jointed to help define the <br />locations of any cracking. we recommend that joint spacing be <br />designed as outlined in ACI 224R. In addition joints should be <br />scored in the floors a distance of about three (3) feet from, and <br />parallel to, the walla. <br />If moisture migration through the concrete slab-on-grade floors <br />will adversely influence the performance of the floor or floor <br />coverings a moisture barrier may be installed beneath the floor <br />14 <br />~Cambert ana ~,a~ociateo <br />CONWlTINO O[OTlCMNKAI lNONI!!q ANO <br />YATENIAI TE 7TIM0 <br />