The Maximum Aggregate Particle Size For A Concrete Mixing Plant

• Posted by Mavis Chai December 18, 2024 Filed in Other #Aggregate Concrete Mixing Plant  21 views
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  The maximum allowable aggregate particle size for a concrete batching plant is influenced by various factors, including the purpose of the concrete, construction conditions, diameter of the conveying pipeline, and specifications of the mixing equipment. The following is a detailed analysis of the maximum allowable aggregate particle size for concrete mixing plants.

  1. General Provisions

  According to relevant regulations, the maximum particle size of coarse aggregate used in concrete shall not exceed 1/4 of the minimum size of the component section, and shall not exceed 3/4 of the minimum net spacing between steel bars.

  For solid concrete slabs, the maximum particle size of aggregates should not exceed 1/2 of the slab thickness ( although it is also specified as 1/3), and usually should not exceed 50mm.

  2. Limitations Under Special Construction Conditions

  • Pumping concrete

  For pumped concrete, there are strict requirements for the ratio of the maximum particle size of aggregates to the inner diameter of the conveying pipe. Gravel should be greater than 1:3, and pebbles should not be greater than 1:2.5.

  This means that if the inner diameter of the conveying pipe is 120mm, the maximum particle size of crushed stone should not exceed 40mm, and the maximum particle size of pebbles should not exceed 60mm (but considering the actual pumping effect and pipeline wear, smaller particle sized are usually chosen).

  • High strength concrete

  For high-strength concrete, the maximum particle size of coarse aggregate should usually not exceed 20mm or 16mm to ensure the strength and uniformity of the concrete.

  • Blender capacity

  For mixers with a capacity of less than 0.8m3, the maximum particles size of the aggregate shall not exceed 80mm to avoid crushing the blades of the mixer.

  3. Considerations In Practical Applications

  • Aggregate gradation

  In practical applications, the appropriate aggregate gradation is usually selected based on factors such as the strength requirements, workability requirements, and economy of the concrete.

  Common aggregate gradations include first gradation(520mm), second gradation (520mm, 2040mm), third gradation (520mm, 2040mm, 4080mm), and fourth gradation (520mm, 2040mm,4080mm, 80120mm). The maximum particle sizes in these gradations correspond to 20mm,40mm,80mm and 120mm, respectively.

  • Construction conditions

  The road conditions, equipment configuration and worker proficiency at the construction site can also affect the selection of aggregate particle size. For example, in narrow or complex construction environments, it may be necessary to choose smaller aggregate particle sizes to facilitate transportation and operation.

  For more detail on concrete mixing equipment, please browse the website lutonmachinery.com.

  In summary, the maximum allowable aggregate particle size for concrete mixing plants does not have a fixed standard value, but needs to be comprehensively considered and determined based on various factors such as specific construction conditions, the purpose of concrete, and the specifications of mixing equipment. In practical applications, it should be ensured that the selected aggregate particle size meets the requirements of relevant specifications and standards to ensure the quality and construction efficiency of concrete.