1957 566 Ordinance - Laserfiche WebLink

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:r'~ Passing 3/8~~ Square sieve from 35~ to 65~ Passing Tdo. ~ sieve from U~ to 15% 3. I+:ilx: Concrete sidevrallc shall be cast off' Ready l~~ix Concrete consisting of a mixture of Air-Entraining Portland Cement, limestone coax°se aggregate, sand and vrater, proportioned in accordance vrith the requirements o_e this specification. Cement sha.tl be measured b~yr vTeight and shall be vJeighed on a 'oalance o-r scale separate from those used to vreigh the other ingredients. _A~;gregates sl_~aJ_l be measured by vle;igllt. Da.tclz vreights shall be based- 'on surface dried mater ia.1s and shall be corrected to take into account the vae~_ght of s?irface ?rra.ter con- tained in the aggrcga.tes. ir~Jater shall be *ne~:~sure:d by volume or vreight. Tot~~l o-r maximum ?va.ter shall be considered. as that 7_nclud? ng added ?^aater and absorbsd (surface) ?~~rater :in a,~;brega.tes. Concrete shall be C],ass "C~~ -Ohio State IIigh?gray Speci fica.tions and shall . be proportioned as follo?ors ~x~ini:•~YUSn cement, bags per 1 cu, yd. of coi:icrrte 6.3 P~aa.:?1?rn vrater, gallons ?per ba.g of cer~crrt 6.25 ~ini!aum compressive strength, 7'a. per sq. in, at 28 days 3,500 The vreights in pour_ds of dry aggregates per sack (91~ lbs.) of Air-Entrained Portland Cement sl:a_ll be as follov~rs Fine Aggregate Coarse Aggregate Total Limestone 190 lbs. 295 lbs. 185 lbs. The ?a~eights ixsed in the above table of aggregates are based on specific gravities of 2.65 fo1• sand and limestone. ~.. P~IXIPIG A_i~1D TR.~^,.1dSP0I~.TTI~TG: T_Y~ this operation the cement, sand and. limestoe shall be loaded and m:i~ed vrith vrater added. All Concrete shall be thoroughly mixed in a batch tSTpe mixer of ap;roved t~~e for at least one and one-ha1.f (1-1/2) minutes. Or..1y enough vrater shall be used to secure l~;Tdx•ation and the batch shal~_ be the stiffest mix possible -to secure vorlcability. `fhe concrete v~rher_ placed shall be of uniform and ?~rbrl.:~ble consistency and in ?no rase shall the slump be less t'nan 2 inches rYOr more •i;han 5 inches. Slump sl~a.ll be d.e-terznined in accord- ance vfith Standard l:et~iod. of S~_unp 'l'est for Consistency in Portland Cement Con- crete, American Society for ^l'esting I!;laterials; Des~:gnation C-lta3. The concrete mixture shall be transporteci-to the site in portable type mixers mounted on :rotor truclts. The mixinb device sl~a.ll be so o{aerated so a.s to revolve at the rate of from tvrel.ve (12) to t?~rent~r-faur (2~.) revolutions per minute. 'f here shall be no sebregation oi' the ~i~red concrete vahen it is delivered on the site. 5. FORi:1S: Concrete shall be deposited in clean steel forms adequately braced to .prevent distortion from the specified dimensions. Steel fo7~ns shall be used on all straight sections of side?~ralk ?~r~th the exception of single five foot sec- tions vrhere mood forms ?~i11 be perr:Yitted. :rood. .form:, mar also be used on special curved sections. All forms sl-~all be subject to the approval of the Engi~.eer and shall be of a size sufficient to produce a ?°ra1t, of a minimum thick- ness or depth of four inches. 6. PLACIVCr COI~JCF~~;TE: The concrete shall be thoroughly t~•.~:Yped. anal consolidated so that none of i.;he stone appears on the surface. The forms must be kept clean and shall be coate;l vaitl? a suitable oil before filling vr~th. concrete. Foundation beds shall be sprinkled i~n~?ec'.iately prior to depositing the concrete, Concrete ?r~hen mixed Shall be rapic'A1y clepositecl 'in the forms and any con- crete not in final position. r~rithin. thirty viinut~s after completion of the mixing 51;1_2