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226 <br /> <br /> All of the above materials shall comply with the re- <br />quirements as hereinbefore specified for that particular <br />terlal, and all broken stone or gravel shall consist of a <br />class "C" mi×ture of sizes, as hereinbefore specified. <br /> <br /> ShouXd there not be enough mortar to completely fill <br />the voids in the concrete, the ~eficiency shall be remedied by <br />reduclug the portion of gravel or broken stone used in the mix- <br />ture and not by adding e greater portion of sand. <br /> <br /> The ~mount of mixing water shall be the minimum <br /> <br />fty that will produce a workable ~fx. <br /> <br /> (a) V~AS~RIN0 ~!ATWRTA!S. For machine mi×ing sand and <br />gravel or broken sto~e shall be measured in whe~l barrows which, <br />when struck with a straight edge resting upon the sides, shall <br />have the eapsclty necessary to accurately mainta1~ the above <br />proportions. For hand mixing, the sand and gravel or broken <br />stone shall be messured in boxes. <br /> <br /> Every wheel barrow load or ~ox full of material used <br />must be struckw Ith a straight edge as aDove specified. Said <br />material shall be measured loose without shaking or compacting. <br /> <br /> Cement in sacks as above specified shall be dumped <br />directly into the mixer or upon the other material, previously <br />measured upon a mixing platform. <br /> <br /> Tbs water necessary for ~ very batch sh~]l be sccu- <br />rarely measured with an apoaratus which wi]] positively prevent <br />the use of more water tha~ required. No mixer shall be used <br />w~fch is not pr?vfded with s~ accurate w~ter measuring apparatus. <br /> <br /> (b) ~I~INC CONCRE~~. Yashica mixing shal~ be done <br />with batch mixers only. <br /> <br /> The Co~tractor sh~ll mix, without spill~ng, such quani- <br /> of ~g~regates, as wil~ be within the capsctly of the mi×er, <br /> <br />ty <br />splitting <br /> <br />or quakin~ c?crete which cs~ be handled without <br />~r~tlon of the coarse aggregate from the mortar. <br /> <br />case s~al] the qusnlty be such that will require the <br />of sscks of cement. <br /> <br />Sufficient w~ter, sh~/1 be added to produce a plastic <br /> <br /> causing a sap- <br /> <br /> The mixer <br /> <br />drum shall havre a cpeed of not <br />than eighteen (18) revolutions <br />concrete shall be mixed in the <br /> <br />less than thirteen (]3) nor more <br />per minute sad every batch of <br />drum of the mixer not less than <br /> <br />sixty (60)' seconds before any portion of tbs batch is discharged <br />from the said drum. At least seventy-five (V5) seconds must <br /> <br />elapse <br /> <br />one (1) box of ~rave] or broken st~oe s~sll be ~laced on <br />tight platform, not tess than t~n (10) feet wide ~nd twelve (12) <br />feet long. ~on the gravel or broken stone shall be placed on <br />(1) bo× of sand a~d upo~ this shall be placed the required num- <br /> <br /> c~ment. The inspector shall be given the <br /> <br />ben of sacks <br /> <br />the p]sci~ of successive batches in the mi×er. <br />~AND ~I~!NG. Where concrete is mixed by hand, <br /> <br /> <br />