Laserfiche WebLink
Indicate by name or code the individual ingredient corresponding to <br /> each weight. Indicate by pressure only, each admixture measured <br /> by volume. <br /> b. On each printout show date and time of batching, identification <br /> number identical to that of the concrete delivery ticket and codes <br /> for the mix design and for the project section. <br /> c. Prepare the printout in duplicate and deliver one copy with its <br /> corresponding concrete delivery ticket to the Engineer. <br /> d. House each recorder mechanism in a locked,dust-tight cabinet, in a <br /> position convenient for observation. <br /> B. Concrete Mixers: <br /> 1. General requirements: <br /> a. Use mechanically operated batch mixers for mixing concrete, except <br /> that batches not exceeding one-third cubic yard may be hand mixed, <br /> or site mixed. <br /> b. Use concrete mixers of the revolving drum type or pan type. Use <br /> truck mixers of the revolving drum type. Replace the pick-up and <br /> throwover blades of revolving drum mixers when any part or section <br /> is worn one inch or more below the original dimensions of the <br /> manufacture's design. A copy of the manufacturer's design,showing <br /> dimensions and arrangements of blades, shall be available to the <br /> Engineer. Batches shall be so charged into the mixer that some <br /> water will enter in advance of cement and aggregates. All water <br /> shall be in the drum by the end of the first quarter of the specified <br /> mixing time. <br /> 2. On-site mixers: <br /> a. Accomplish on-site mixing in paving or stationary type mixers. Operate <br /> mixers at the speeds recommended by the mixer manufacturer, except that <br /> revolving drum mixers shall make not less than 14 nor more than 18 <br /> revolutions per minute. <br /> b. Operate paving and stationary mixers by an automatic timing device and <br /> discharge mechanism so that, during normal operation, no part of the <br /> batch will be discharged until the specified mixing time has elapsed. <br /> The total elapsed time between the intermingling of damp aggregates <br /> and the discharging of the completed mix from the mixer shall not be <br /> less than 60 seconds or more than 300 seconds. In order to produce a <br /> 08/12 03305-12 11-4179 <br />