In infrastructure construction such as buildings, highways, and bridges, 20-37.5mm coarse aggregate is a core raw material for concrete mix design and roadbed filling. Its particle shape and gradation directly affect project quality and cost. Therefore, choosing a professional and efficient 20-37.5mm coarse aggregate crushing equipment is crucial for the success of every aggregate producer.
I. Why is 20-37.5mm coarse aggregate so important?
This size of aggregate forms the skeleton of concrete, bearing the main load-bearing load. High-quality 20-37.5mm coarse aggregate should possess the following characteristics:
• Uniform particle size and reasonable gradation: Ensures the density and strength of concrete.
• Cubic particle shape: Reduces the content of needle-like and flaky particles, enhancing the workability and compressive strength of concrete.
• Cleanliness and low mud content: Ensures good bonding with cement paste.
To produce aggregates that meet high standards, the key lies in the selection of crushing equipment for the medium and fine crushing stages.
II. Mainstream Crushing Equipment for 20-37.5mm Coarse Aggregates
For this medium-sized aggregate production, two main types of high-efficiency equipment are available:
1. Cone Crusher – The Replacement for “Compression” Technology
• Working Principle: Employs the principle of layered crushing, crushing materials through the compression between the moving and fixed cones.
• Applicable Materials: Medium to high hardness materials, such as granite, basalt, and river pebbles.
• Product Advantages:
◦ High wear resistance and long service life: Core components are made of high-manganese steel, suitable for crushing high-hardness materials, with low operating costs.
◦ High efficiency and stable output: Strong continuous operation capability and easy to automate.
• Finished Product Particle Shape: Uniform particles, but the content of needle-like and flaky particles may be slightly higher than that of impact crushers, which can be improved through cavity optimization.
2. Impact Crusher – The Expert in “Impact” Crushing
• Working Principle: Utilizes high-speed rotating rotor hammers to impact the material, causing the material to be crushed through multiple impacts on the impact plates.
• Applicable Materials: Materials of medium hardness and below, such as limestone and dolomite.
• Product Advantages:
◦ Excellent Particle Shape: Utilizing impact crushing, the finished product is predominantly cubic with extremely low needle-like and flaky content, making it an ideal choice for high-performance concrete aggregate.
◦ Easy Adjustment: The discharge particle size can be flexibly controlled by adjusting the rotor speed and impact plate gap.
III. How to Make the Best Choice for Your Production Line?
Choosing between a cone crusher and an impact crusher requires comprehensive consideration of the following factors:
| Consideration Factors | Recommended Cone Crusher | Recommended Impact Crusher |
| Raw Material Hardness | High-hardness materials (granite, basalt) | Medium-low hardness materials (limestone, weathered rock) |
| Particle Shape Requirements | Uniformity required, acceptable small amount of needle-like and flaky particles | Extremely high requirements, cubic particle shape is mandatory |
| Operating Costs | Long wear parts life, low long-term operating costs | Faster hammer wear, but easier replacement |
| Investment Budget | Relatively high initial equipment investment | Relatively low initial equipment investment |
There is no absolutely best equipment, only the most suitable solution. • If your primary focus is processing high-hardness rock and you prioritize low energy consumption, wear resistance, and high output, a cone crusher is a reliable choice for producing 20-37.5mm coarse aggregate.
• If you mainly crush medium- to low-hardness materials and have stringent requirements for aggregate shape to enhance product added value, an impact crusher will better meet your needs.
Contact Us
Our engineering team can provide you with free material analysis and production line planning, tailoring the most economical and efficient 20-37.5mm coarse aggregate crushing solution to your specific requirements, helping you stand out in the competitive market.
We hope this solution meets your needs!
