Batching and Mixing of Concrete Sample Clauses

Batching and Mixing of Concrete. All concrete shall be batched by weight and mixed mechanically. Hand mixing shall not be allowed except only upon the written permission of the Engineer or his Representative. Concrete may either be batched and mixed on site or outside the site and transported thereto. When mixed outside the site and transported to it, batching and mixing shall be in accordance with ASTM Specification C94, ‘Standard Specification for Ready-Mixed Concrete’. When mixed on site, batching and mixing shall be as follows: BATCHING BY WEIGHT: The cement and each size of aggregate shall be measured by weight. The water may be measured by weight or volume. The weight-batching machines used shall be of a type approved by the Engineer or his Representative and shall be kept in good condition while in use on the Works. Checks are to be made as required by the Engineer or his Representative to determine that the weighing devices are registering correctly. BATCHING AGGREGATE BY VOLUME: When batching aggregates by volume is allowed as and when required, the cement shall be batched by weight and the water by weight or volume - Each size of aggregate shall be measured in metallic containers the depth of which is at least equal to their greatest width. The containers shall be of such shape that their volume can be easily checked by measurement. MIXING CONCRETE: the location of the batching and mixing plant shall be agreed with the Engineer or his Representative. The amount of concrete mixed in any one batch is not to exceed the rated capacity of the mixer. The whole of the batch is to be removed before materials for a fresh batch enter the drum. On cessation of work, including all stoppages exceeding 20 minutes, the mixers and all handling plant shall be washed with clean mixing water. If old concrete deposits remain in the mixer drum, they shall be rotated with clean aggregate and water prior to production of new concrete. Concrete mixed as above is not to be modified by the addition of water or in any other manner to facilitate handling or for any other reason.
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Related to Batching and Mixing of Concrete

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