1957 566 Ordinance - Laserfiche WebLink

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.. r 1 shall be discarded. Under no circumstances shall concrete be used that has p_~.:•`•- ially set and the re-mixing of such materials is 1~rohibited, The concrete sha]_1 be deposited b~tT^reen bul'sheacls of a uniform thi ckness and to the full depth arlcl v~rid•th of the wralk, irregular or sloping surfaces shall be avoided. The concrete after. being placed shall 'oe th.orough7.y compacted and brought to tl-ie proper pitch and grade writh a templet or straight edge.. Immediately prior to the finishing of the surface, the ti^sal',: sha].1 be cut into slabs not longer than six feet on any one side. The joints sha11 be cut through the full thickness of the rr~~1k and the opening so made shall be fi 1].~d i~^ith clean, dry sand w,~ell rammed into p7.«ce, The joints sl~a.11 be formed ioJr a cutting tool or other means sa-tisfa.etort,~ to the Engineer. The. markings ilz t:ie surface of the wJalk a,t .these joints sr~11 not be more than one-fourth inch deep. till edges shall be rounded z~n tii an approved edging tool 'to a radius of one- f ourtl~ i rich. 7. SU?F!CE FIi~}TSH: The finishing of the ~„•~ ~k shall i±?~snediately follow: the placing and compacting. of the concrete. Unless other~~;],se orcler~oci by the Engineer, a finish produced by rubbing rith 5rrood floats -!rri11. be required. The surface shall be free from depressions or ineq_u~tilities, The ap;oiicatioiz of dry' ce?nent to • hasten drying of ~t_~ie surface is prchibited, 8$ CIJi_i'.ING !!}>~ PFtOT~~CTIITG: In rainy wreather, the concrete shall be protected a.s soon as it is finished, In hot or dry wreathes, the Contractor shall '_.~eep the concrete wret. Sprinkli ~-~g shall be begun as soon as t-.Ze concrete is set sufficiently to prevent pitting;, and shall be continued "at such intervals as the wreathes concli~ tions may. require, br. the Engineer may direct. 9. EXl'!!NSiON JOIPITS: Prepared strips of bitumen and fiber or mineral aggregate, shall be placed in concrete ti~ralYs at intervals of at least twaenty feet, also <:t• ends wrhere the w••rallk abuts cz:.rbing or other laLteral wra].lcs, anal along the buildir~.~; line ~~rhere the ~~ralk is laid fu11 wri d.th frrom., the curb to the building or other structures. Simi1<~_r joi_its sha7..l be placed around ;~•rater--?;2eter covers, gas boxec,s hydrants, lamp standards rr other fired objects pro~ieeting through the vralk. 1~."~_l strips sha11 be one-fourth inch in i;hiclcr?ess, except for transverse joints z~'nen' the temper attire is 'oelowr 70° Fal~rerizeit, in ~~rhi_ch event the strips shall be one-"~ half inch itz~ thicl~r~ess . ~i'he top of the strip shall be cut off flu,,^h i':rltl'1 the ,top of the concrete. 10. ":i0R1~ IA1 FRETJZIi~}G l~~-Ea:Tl~~~i.~t: Unless otherwrise specifa.ed, co:~zcrete ~^rhen depOSltUc'• shall have a temloer2ture oz not less tl~an >0 degr;:es Fa:nrenheit, nor more than ll~~ degrees Fahrenheit. Zn freezing w.rea.ther, suitable means shall be provided far maintaining the. concrete at a temperature of ~.7 degees Fahrenheit for a period of not less t,zan seven (7) da~rs. Constr,zct~.on must stox~ if the temperature falls, to ~6 degrees Fahrenheit. Vo fr. oxen mate.ri~=rls sha11 be used in the ooncrete nor sha.11 concrete be laid on .frozen ground. .F~ny concrete wrhl.ch may be c7.a-nas~d by frost action shall be re- placed bzl the Contractor at, his o:4rn ~enl~ense. . 11, COi'dCR~~'E TEST SPT~CT~ ~.E:~~S: 'iwro test cylinders, , 5 inches in diameter and 12 inches high shall be made each day fro?~~ concrete z~rhich is being incorporated in the uJorlc. if so ordered by the Engineer. These cylinders sl~a.ll. be made and tested by a reputable ls_bora.ory selected by -the Engineer, shall be made in accordance vrith Standard i!yethod of ifalcing ca.nd Staring Compression Test Specimens of Concrete in the Field, ~l..S.T.?~. 17esi~,n~.tion C 31, and then tested in accordance writh Standard I.~lethod of. Test for Compressivo Strength .o:e Molded Concrete CTlinders, A.S.T.PI.