Summary of knowledge of concrete mixing plant
1, Introduction to concrete
Concrete is cement for cementing materials, sand and other materials will be solidified from a kind of artificial building materials, hardened with the nature of stone, referred to as concrete.
The types and performance of the concrete required for different construction projects are very different. When the production is done, if the performance and use of the concrete produced are understood, the equipment can be adjusted accordingly to improve the quality of the concrete mix and Not prone to error.
One of the main signs of the performance of concrete is its strength, is a side length of 150mm square test block after 28d standard maintenance, measured by compression test, the commonly used strength range is 10-60Mpa, the general strength level C20 -C60 said.
The workability of the fresh concrete, or called the workability, refers to whether the concrete mixture is easy to construct and operate, and obtain uniform quality, compact performance, is the concrete process performance collectively. Including the mobility, cohesion and water retention of the three aspects of the meaning. Liquidity is the corner that is easy to flow and is easy to fill the casting template. Cohesion refers to the structural properties of concrete is uniform and stable, and is less prone to delamination and segregation. Water retention is not prone to bleeding.
The greatest impact on the construction of concrete is the mobility. The fluidity of the plastic concrete is expressed in terms of slump, which is generally in the range of 10 to 200 mm. The greater the value, the stronger its liquidity. Dry hard concrete in Weibo consistency, the range is generally 5-35s. The higher the value, the higher the dry hardness of the concrete.
The workability of the concrete is determined by the engineering structure and the construction method. Now the construction site to use more fluid or large flow of concrete, only the use of precast concrete concrete dry hard concrete.
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