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Job N0. 4871 <br />dlstrlbutlon of crane loads to <br />sIabs. Tt 8t 811 Possible, Panelsexterior of the bulldings. <br />prevent cracking <br />should be tllted <br />Page 6 <br />of floorfroE the <br />I <br />It is cautioned that c o ncre re slabs in areas to recel-ve <br />ceranic t.11e or other crac k sen s iEive floor cove rl n8s musE <br />be deslgned and consEructed to mininize hairline cracking. <br />lrtherever the floor slab is uo be subject to vehicular <br />traffic loading suc h as forklifts, especially fr oB those <br />with hard rubber vheelsr the performance of the slab 1s <br />critlcsl vj.th resPect to Eoveoents and spalllng at the <br />control joints and supporting capa ci ty of the concreLe. If <br />such usage is anticipated, the oHner should notlfy the <br />contractors and deslgn consulEanLs so that approprlate <br />treasures are !akerr to reduce the rlsk of floor slab <br />failures. The folloving construclion procedures are <br />presented for consideration: <br />]. The f i ni shed grade of i-he building pad sho u1d be nade <br />by overf11llng and cutLlng back to a f lrm coEPact surface. <br />2. The concre!e contractor should be prohiblted froo <br />spread in g so11 froB fooEing exca va t ions oD the bui 1d ing pad <br />u nder these oaterlals are coEpacced. <br />Concrete Slab Constructlon <br />It is our opinloD that concrete floor <br />areas or in other areas to be covered <br />sensltive cov erl ngs be con slruc t ed over <br />meobrane, The Plastic nenbrane should be <br />sealed, and p r oLected Ylth sand. <br />3. If an adequarely conpacted <br />roaintalned, the use of a 4 inch Iayer of <br />base strould be considered belon the s18b. <br />Pavemen t Desl <br />The project structural angineer ehould be consulted <br />regarding the deslgn of slab thicl<ness reinforcing, and <br />controt Jolnts for thls tyPe of ioadlng. A coef ficient of <br />subgrade reactlon (X value) of il5 ps1/1nch roay be used for <br />deslgn of rhe concrete floor e 1a bs. <br />slabs 1n office <br />wi th moisture <br />a 6 roil plastlc <br />proper Iy lapped, <br />surface cannot be <br />compacted aggreSate <br />soil has been determlned by <br />1n accordance wi th Californla <br />of rhe Eests are as follovst <br />I <br />L <br />t <br />I <br />L <br />n <br />The st.abllity of the <br />performing *R!t Value tests <br />Te6t Hethod 3016. The regulLs <br />L <br />L <br />L <br />I <br />I <br />t