In the concrete mixing plant industry, the control of raw materials is one of the main factors that affect the quality of concrete. Therefore, the quality requirements for aggregates in the procurement of enterprises are also very strict. What are the requirements for the use of raw materials in concrete mixing plants? Fujian Xinda Machinery takes you to know.

(Concrete batching plant HZS120 manufactured by XINDA Machinery in Bangladesh)

CEMENT: The entry of cement must be inspected in accordance with regulations. Each batch of imported cement is required to be tested for consistency and temperature in time, it is forbidden to store in warehouses with doubt about quality, and other indicators (such as stability test) are continued to be tested. Unqualified cement is strictly prohibited from entering the site. It is forbidden to use the hot cement that has not been homogenized (digested) directly in the project, and for the used cement, it is necessary to trace back and fill in the "back-up table for cement use".

AGGREGATES: The coarse and fine aggregates must be sampled and inspected according to regulations. For coarse aggregates, select the gravel or crushed pebbles with reasonable gradation, good granularity, and uniform texture. Various indicators of coarse aggregates should meet the requirements of the relevant standards and regulations; the contents of mud and mud blocks should be controlled, and timely inspections should be conducted, if unqualified, it is forbidden to enter the site for unloading.

ADDITIVES: When additives enter the site, inspections and tests shall be intensified to check whether the additives are marked on the obvious positions with the following contents: product name, model number, net content or volume (including content or concentration), name of the manufacturer, the date of manufacture and the serial number of the factory; Check whether the contents indicated in the package are in accordance with the specifications and certificate provided by the manufacturer; Whether the liquid additive precipitates or not, and whether it exceeds the validity period.

MINERAL ADDITIVES: In accordance with the requirements of relevant standards and regulations for testing. The test room should keep abreast of the quality changes of mineral additives.When mineral additives enter the site, the water demand ratio, loss on ignition, and fineness testing must be performed. Only products that have passed the inspection can be stored in the warehouse; And pay attention to the results of the previous test to compare the fluctuations of the quality to ensure the quality of the project.During the use of mineral additives, the relative stability of the additives should be ensured as much as possible. Communicate with the materials department to ensure that for the same type of additives, a concrete mixing plant should try to use the same manufacturer's goods. When it fails to meet the requirements, the testing department shall adjust the mix ratio in time and prohibit the mixing of mineral additives.

The material personnel of the concrete batching plant should pay attention to the situation of inventory materials in time, and must have the foresightedness and sense of urgency, actively organize the preparation of materials, avoid the occurrence of downtime, and pay special attention to the balance of bulk cement. The inventory of materials should be listed, and keep stacking of materials on site at any time, strictly store the raw materials according to the bins.