The material specifications for a softball field should align with those used in road construction to ensure durability and performance. Natural turf must meet the standards required for garden planting, while synthetic materials should also comply with environmental protection regulations.
**Natural Grass Materials**
1) **Soil Quality**: The soil for natural turf should be sandy loam with a well-graded particle size. It needs to have excellent water and air permeability, allowing rainwater to drain quickly without pooling on the surface. This ensures a stable grass bed and promotes healthy seedling growth.
2) **Grass Seedlings**: The quality of grass seedlings should follow the guidelines outlined in the construction standards for football fields, ensuring strong root development and resilience.
**Artificial Turf Field Materials**
1) The length of artificial grass blades should exceed 4 cm, with no more than 1 cm exposed above the surface.
2) In artificial turf installation, the base layer can be filled with sand, while the top layer must be composed of black crumb rubber to provide cushioning and stability.
**Artificial Turf Base Material**
The base for artificial turf can be constructed using road-grade materials such as asphalt concrete or cement concrete, ensuring a solid and level foundation.
**Soil Material Requirements**
The soil for the softball field is typically artificially treated to meet high-performance standards. Natural soil or mixed raw materials often fail to meet these requirements. The following are specific criteria for soil:
1) **Soil Particle Size Distribution**
| Sieve (mm) | 10 | 5 | 2 | 1 | 0.5 | 0.25 | 0.075 |
|------------|----|---|---|---|-----|------|--------|
| Throughput (%) | 100 | 83–98 | 68–79 | 57–71 | 45–57 | 26–33 | 9.8–11.6 |
2) **Soil Color**: The soil should be brownish-yellow or orange-red, either derived from naturally processed soil or through sintering, crushing, and adding specific additives.
3) **Soil Liquid and Plastic Limits**:
- Plasticity Index: 8–12
- Liquid Limit Index: 30–35
4) **Dry Density**: 1.6–1.7 g/cm³
5) **Soil Additives**:
- Maximum amount of curing agent allowed.
- Soil must not contain any dyes or environmentally harmful substances.
**Gravel Material Requirements**
- Maximum particle size: 10 cm
- Particles smaller than 5 mm should not exceed 30% by volume.
- Clay content should not exceed 10% of the mass of particles below 5 mm.
By following these detailed specifications, the softball field will offer optimal playing conditions, long-term durability, and environmental sustainability.
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