Fill and in concrete skeleton from the role of minerals in diameter 0.16mm or more granular materials, also known as aggregate.
1)Account for the total volume of concrete aggregate 70% to 80%, in the concrete skeleton of the formation of strong, concrete shrinkage can be reduced.
2) changing the performance of concrete. By choosing the appropriate species or aggregate gradation aggregate, to the preparation of the concrete with special features, such as lightweight concrete, concrete radiation, heat-resistant concrete, waterproof concrete.
3)Well graded sand and gravel can also save the amount of cement in concrete.
Concrete Aggregates generally used in the clean river sand, coarse sand to choose the appropriate. Coarse aggregate should be based on local resources and material supply conditions, combined with engineering requirements, as appropriate, use gravel, crushed stone or crushed gravel.
The maximum size of coarse aggregate size according to the structure, steel spacing and construction methods, equipment and other conditions selected. In all aspects of the conditions permitting, structural concrete should use well-graded particle size larger stones. The performance of concrete aggregate, including the workability, strength, durability and so on, have a great impact, but also directly related to the amount of cement and concrete costs.
If the aggregate non-performing particle size distribution will affect the workability of mixture, resulting in poor construction quality, concrete strength decreases, causing the cement waste; aggregate with mud, it will affect the flow of concrete, strength and frost resistance; bone lack of strong material, but also will reduce the frost resistance of concrete. Reactive aggregate and alkali cement a place in the alkali aggregate reaction, will have expanded, resulting in concrete cracking, or even collapse.
Therefore, in water, soil, outdoor and indoor wet conditions, the aggregate used in concrete, should be alkaline activity test. Construction site should use local aggregate, Metallurgical Construction should pay attention to the use of metallurgical slag, to shorten the distance and reduce shipping costs, develop resources, governance harm utilizing waste.
In order to save cement, to improve the performance of concrete when the mixing of concrete mixed with fly ash, this concrete, fly ash concrete.
The industrial milling machine equipment processed fly ash powder particles uniformly distributed in the slurry, filling pores and improve the concrete pore structure and increase the density of concrete, so that the durability of concrete is improved. While reducing heat of hydration, inhibition of alkali - aggregate reaction. With the prices of cement, fly ash concrete was out of the economic benefits will be added.
In recent years, China is also ready-mixed concrete, precast concrete and the application of pumping, the basis of a number of important works, underground works, roads, overpasses, and nuclear power stations are also application of fly ash concrete. Ash concrete processing, deep processing of fly ash from cement, fly ash, sand, stone, the five components of the water, fly ash processed through the mill to a certain degree of fineness, it can be material with cement and put into the mixer, if the powder mill production for the wet fly ash, can advance it with a certain amount of city water slurry, and then put into blender, then into other materials.
In order to ensure uniformity of mixture, should increase the mixing time than ordinary concrete for half an hour, falling behind in the production of 20mm or less than dry concrete mix compounds, the appropriate use of the milling machine for grinding, with compulsory concrete mixer, mixing fly ash in lightweight concrete, add some water, about half an hour before pre-mixing, then add the fly ash mix, finally adding the cement and the remaining water and mix well.
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