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b. Weighing hoppers shall be constructed so as to eliminate <br /> accumulations of tare materials. <br /> c. Weight aggregates in separate weight batches with individual scales, <br /> or cumulatively in one batcher on one scale. Weigh bulk cement on <br /> separate scale in a separate weight batcher. <br /> d. Where mix water is measured by weight, do not weigh water <br /> cumulatively with another ingredient. <br /> e. Interlock batching controls so that the charging mechanism cannot <br /> be opened until the scales have returned to zero. Satisfy these <br /> requirements by a semi-automatic batching system as defined in <br /> the Concrete Plant Standards of the Concrete Plant Manufacturer's <br /> Bureau, with interlocking as described herein, or by an automatic <br /> batching system as defined in the Concrete Plant Standards. <br /> f. Provide facilities for obtaining representative samples of aggregate <br /> from each of the bins or compartments for test purposes. <br /> 3. Water batcher and admixture dispensers: <br /> a. Provide equipment for batching water and admixtures at the batching <br /> plant, except in cases where the mixing has been authorized by the <br /> Engineer to be performed at the job site in paving mixers or in truck <br /> mixers. <br /> b. Provide a device that is capable of measuring mixing water within the <br /> specified requirements for each batch. Provide mechanism for <br /> delivering water to the mixers so that leakage will not occur when the <br /> valves are closed. <br /> c. Interlock the filling and discharge valves for the water batcher so that <br /> the discharge valve cannot be opened before the filling valve is fully <br /> closed. <br /> d. Provide measuring devices for admixtures capable of ready <br /> adjustment to permit varying quantity of admixture to be batched. <br /> Interlock the dispenser for admixture with the batching and <br /> discharging operations so that the batching and discharging to the <br /> mixture will be automatic. <br /> e. If non-interlocked dispensers are permitted,check the calibration of <br /> the dispensers at intervals as required by the Engineer. Record the <br /> results of such calibration and make it available for the inspection of <br /> the Engineer. <br /> 08/12 03305-10 11-4179 <br />