1963 825 Ordinance - Laserfiche WebLink

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14~Iinimum cement, .bags per 1 cu. yd. of concrete 6-1/2 1~Iaximurn vrater, gallons per bag of cement 5=1/2 i.linimum comeressive strength, lb. per sq. in. a-t 22 da~Ts 3,500 Proportion bj~ volume, cement to total <<ggregate 1 to 5-1/l~. The vreights in po~inds of dry agzregates per sack (9~ 1bs.) of 'Air-En- tr. dining Portland Ce~n,ent sha11 be as follol^;~s Fine ti~gregate Coarse A~;g:e,;ate Total . Limestone 120 lbs. 300 ]_bs. l~20 lbsa 57_ag 195 lbs . 2~+,~ lbs . i.;~;.0 lbs . The weights used in the above tanle of ,:~~;c;reg:?tes are based on specific gravities of 2.65 for sand end limestone and. of 2.30 for slag. The slump range in inches, small be not less than 2 inches nor tuore than 3 inches vrhen finished by ordinary ~1et11ocls an~~ shell be not less than 1 inch nor more than 1-1/2 inches 1.^hen a'in~_sl~:~ed by use of ~;. ~~ribrating machine. Sliziip shall be determined :in accordance tiulth Standard i:'.e tl~.od or: S1LUn1~ Test for Coil-- sistenc~T in Portland Cement Concrete, ^s?ierican Societ;j .Lo~• 'Les~ing T{~iaterials DesiGn~^tion C 11,x. (e) CUI`1C1~1{;TE T:~S`i' SP-;Ci:1~~li;I~IS: T~rro test cylinders, 6 inches in diameter and 12 inches high shall be ma.c.e: fron each 2000 square y~l:rds o:c pa~ve~aent or frnction " thereof, p1.r.{ced each da`r from concrete V:ihich i.s being; :incorporated in the l~`•iullt, if so ordered by the Engineer. These cylinders shall. be made and tested by a. reputable laboratory selecte~-1 b~; the En~inee.r, shall be m~:.de in accordance ~;>j_th Standard ?:ethod o:C ;faking and Storing Compression Test Specimens of Conc.r`ete in the +ielc'~, ~.S.T.T.`.nesig~n~ztion C 31, ::nd then testod in accordancE ~~rrith ' Standard i.iethod of Test for Comer ~ ssitre St-ren~;tt-~ of i.:olde~l Cnncr. ete Cllinclers, .^-a. S. T.'. Desinati.on C 39. The ~_in?mum compressive st:ceng•th o:f' concrete at ter.*enty-eight (2c2) cats sha11 be 3, 5u0 ;:your?ds p~;,° sn,_iare ir_ch. Contra+.c~to?^ shall pay all costs for s~ ic:h tests . (f) Ti:Pi~ 01~ CUi~T~J1:IJLIJ: Onl~T react'-m-ixecl concrete- T-r; ~_l 'oe used and a1loUred in tl-.e concrete ~~av~e?nent. 1n this oper`tion the rer~ent, send and l~mcstone or slat; shall be loa.dect and mixed :^;ri.th ~~rater ad.caed. r~,ll eonez°etc: shall be thoro»gh~_.;r rnixcd in a butch t~~pe mixer of ~~.l~proved type for <-it lA2.s-t one and one-half (1-1/2) minutes. Cnly enough Trr:~ter shall be ~zsed. -to secure hydrata_on and tl~c~• .. batch shall 'oe the stl_"fest mix l~oss~:ble to secure ~~rorlca.bility. The Concre-;,,: l~rhen placed. sl~a.ll be o.i uziiform a.nd ~nrorlfable consistenc,;r and. in no case sYlall tine slump be loss than 2 inches nor more than 3 inches excerpt vrhen vibrating; machines a..re used in -~rhi.ch c~~se the slump sha.L. be not less than 1 inch nor more than 1-1./2 inch. The concrete mixture shall be transported to the site of ?'rork in portable t~r~pe mixers •rno~lnted on motor t.rtzclcs. TY?e mi;cin`, device shall be operated so as to revolve at the r?te of front 12 to ?)_; revolutions ?~et:~ minute. There sha11 be no segres;ation of the m fixed concrete vahen it is delivered on the site of ,"dock. Concrete shall be ':nixed nat to exceed. one (1) hour before placing, unless otherwise ne~•mitted bar the Engineer. - If ordered by En~,ineea°, Contractor must i:>z~ovide r..la.tu~,.:in`; over 1~rhich the concrete rni.~e~: truclts can back over •the prepared subL:re.de. 1'•._ny rutting of the sub~;rade must be reT~aired by :resha7~i ng surface, f:~_ll:Lng any depressions with fine granulated slag or s'la~; screenings and then tl~o.rou~hly rolling to firm compaction.. ~l~-3