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Thomaa Jones �� <br /> March 14, 1996 P�a <br /> roinforc�d with a minimum of M3 roinforcinp b�r pl�wd on an 1&inch p�id. I�olatlon Jofnb thould <br /> be provtded, whero ths slabs inte�s�ct columm and walis. Cantrol and uc�nsion joinb should <br /> also bs uaed to control chdciny irom �xpan�lon and contractlon. Saw cub or pn-fomki �trip <br /> Joinb u�ed to contrnl ahriniu��aaddnp �hould�xNnd throuph IM upp�r on♦fouAh of�ach ilab. <br /> The spadnp of conlrol or u�pansion joinb depsnd� on tl►� slab shap� and tM amouM of sbN <br /> pleced In M. Redudnp ths water to c�ment ratlo of the conast� and cwirq 1M aona�, by <br /> proveMiny the ewporatlon of froe watx uMil am�nt hydratlon oocurs, wlq abo nduo� �hdnkp� <br /> crackinp. <br /> The eWclurai flll and rointordnp mentloned abow for the paraps �labt of tt��olh�nsid�na� Is <br /> not nea�:ary for the slabs in the rosid�na on Lot 13, provid�d that 1M Wabt m wpport�d on <br /> competent, naUve aoil or swctu�al 8�1 pl�ced �bovs this comp�t�nt wtl. Ona apafn, IM <br /> aubflrade eofl muet be in a Nrtn, non-yleldfnp conditlon at ths tlme of sl�b construcfion or und�r�lab <br /> flll piacement Any aott are9� encount�nd ahould be excavated �nd nplaad wkh sN�ct, <br /> imported, aVucturei flll. <br /> All elebe-on-prade ahould be undsAain by a capillary bnak or drainap� lay�r eonsfitlnp of a <br /> minimum Minch thfckness of coarss, iroe-draininp, strudural flll wRh a pnd�tlon �ImNar to th�t <br /> discu:aed I�ter in P�rtnaneit Found�tlon �nd R�hinina Walb. In �nas wh�rs the paaap�of <br /> moistun throuph the si�b is unde�irabls, a vepor b�rti�r, such u a 6m0 plasUc m�mbran�, <br /> should b�placed bensath ths �I�b. Addidonally, sand should b� used in IM}In�-gndinq proass <br /> to roduc� d�maps to the v�por barthr, to provid� unNorm support und�r fM �lab, and to nduc� <br /> �hrinkap�cradcinp by improvinp the concrote curiny procs�s. <br /> P�rtnan�nt Found�Hon and R�talnina Walls <br /> Retaininp wails backfllled on only one sida ahould bs desipned to roalst the lateral e�rth prosaunf <br /> imposed by the sofl they rotsin. The foundeUona for these rhafninp walls �hould be desbn�d <br /> foliowinp ths above recommendaUons for the houa foundatlons on Ih� nap�ctive lob. Th� <br /> tollowinp recommended dasiyn parametera aro for walls th�t nttnin IsvN badcflll: <br /> Parameter Dsa(an Value <br /> Active Eerth Proasuro• 35 pcf <br /> Paaaivs Earth Pro::ure 250 pcf <br /> Coefflcfent of FricUon 0.30 <br /> Soil Unft Welpht 130 pct • <br /> Wharo: <br /> 1, pcf la pounds per abic foot <br /> � 2. Act(ve and pas:ivs earth protiuns an _ <br /> computed utinp the equivalent }luid <br /> denaidea. ' <br /> • For resVained walls that cannot deflect at least I� <br /> 0.002 tlmes their hefpht; a un(tortn lat�ral I <br /> preasuro equal to 10 paf tlmes the hNQht of a wall ! <br /> ahould be added to the �bovs activ� puiv�Nnt i <br /> fluld proa�uro. ! <br /> oearecx coran.rexn,rtic. <br />