Concrete production and supply process control measures

1, regular verification of measuring instruments, ensure correct measurement.

2, each working class officially opened before weighing, measuring equipment for zero check.

3, in the process of production and supply, strict monitoring of sandstone aquifer, each class sandstone water sampling frequency of not less than once, in case of rainy day, increase the testing frequency.

4, in the whole production process, strict control of each plate of concrete material deviation and cumulative deviation measurement results meet the specification, to ensure that the gelling material for positive error of measurement, sand single adjustment is not more than plus or minus 2%, sand ratio adjustment range is + / - 1%.Allow inspector to adjust water opening is 2 kg/m3, when more than allow adjustment quantity, should be determined by the laboratory to determine after sand moisture content.

6, strictly control the water cement ratio, water cement ratio.

7, strictly control the workability of concrete, to ensure that the slump in the plus or minus 2 cm range, meet the construction requirements, to ensure the concrete no segregation and no bleeding, no separation.

8, stir well record and scheduling, transportation receipts written content is complete, ensure that mixing records, receipts, outbound time and scheduling start recording time consistency and traceability.

9, the same part, same grade concrete per 100 m3, 3 days, 7 days, 28 days lien block, there are other requirements stipulated in the specification of the lien block.The outbound slump of concrete per car to do a test.

10 and strengthen transportation control, it is forbidden to add additive in transit and water.For secondary adding admixtures in the construction site, admixture must arrive at the construction site, with mortar and concrete admixture adding amount shall not exceed the limit per 5 kg, the admixture added technical personnel at the scene under the guidance and supervision and determined.

11, equipped with on-site quality inspection, to ensure 24-hour continuous monitoring management.

12, to strengthen the construction unit, construction units, on-site supervision, build a game of general contracting company technical personnel's communication, ensure the continuity of supply.

13 and the construction mix proportion, raw material changes, approval in advance, after approval.

14, guarantee will not be returned to the concrete used in other engineering again.

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