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Management of raw materials in concrete mixing plant

Author: admin Release time: June 6, 2017 Number of visits:

1. Cement

The concrete mixing plant shall use high quality cement of various grades supplied by Party A. The cement entering the site must be provided with factory certificate and test report (the test report can be delayed for a certain time), and its variety, strength grade and delivery date shall be strictly inspected and accepted. The cement with different delivery date shall be poured into the warehouse separately, and the marks and labels shall be made at the same time. It is forbidden to use it if it is not qualified.

The cement entering the site shall be inspected in the laboratory according to batches, and its strength grade and technical requirements must meet the requirements of railway specifications. If the cement has not been used for more than three months, it must be rechecked and can be used only after passing the inspection.

2. Sand

The yellow sand meeting the quality standard should be used as the concrete fine aggregate in the concrete mixing plant, and its fineness modulus is 2.3 ~ 3.0. More than or equal to c52.5% and more than C 4.5% are strictly controlled. The incoming batches shall be inspected separately and put into the warehouse after passing the test. All indexes must meet the requirements of railway specifications.

3. Crushed stone

Stone materials meeting quality standards shall be used. Strictly control the quality to ensure that the needle and flake content of crushed stone meets the design requirements (below C50 ≤ 10%, above C50 ≤ 8%), and the mud content meets the design requirements (below C50 ≤ 1.0%, above C50 ≤ 0.5%), and inspected separately according to the incoming batch, and put into the warehouse after passing the test, and each index must meet the requirements of railway specifications.

4. Water

Use tested drinking water. The amount of water added is controlled by the mixer pump through the electronic scale.

5. Admixtures

Use the admixture controlled by A. After entering the site, the admixtures shall be inspected and accepted strictly. The admixtures shall be poured according to their varieties and production dates, and shall be marked. The admixtures shall be tested before use and can be used only after passing the test. Its technical indexes must meet the requirements of railway specifications.

6. Fly ash

The concrete mixing plant shall use fly ash (mineral powder) controlled by Party A. after entering the site, it shall be strictly inspected and accepted, poured according to the production date and marked. The test shall be conducted before use, and it can be used after passing the test. The railway technical specifications must meet the requirements.