Talk about ready-mixed concrete production, construction of “ahead” and “lag”

Concrete specimens standard maintenance 28 days before you can judge whether the factory concrete to meet the design requirements, while the site casting of concrete with the maintenance specimens is 600 ℃ - d as a criterion, winter construction, if the average daily temperature of 10 ℃, you need to care for 60 days in order to judge the structural strength of whether to meet the design requirements.
For ready-mixed concrete batching plant, to ensure that the strength and performance of the concrete factory, the ratio is fundamental, and the quality of raw materials before the preparation and production of concrete, raw materials with the use of "ahead" control is the key.
In addition, due to the lack of supervision of the concrete pouring site, the construction personnel to pursue self-levelling concrete pouring, adding water is serious; even if the quality of ready-mixed concrete factory qualified, the site will lead to a straight-line drop in concrete strength after adding water.
Sand, stone in the concrete in the largest amount, its quality will directly affect the quality of concrete, which sand and gravel particle size, particle shape, grading, mud content, stone powder content, moisture content and other parameters fluctuations, if the concrete ratio is not adjusted accordingly, its work performance and strength will be deviated.