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Lime soil base layer construction quality requirements are essential to ensure the stability and durability of the road or track foundation. The following guidelines must be strictly followed during the construction process:
1. The lime soil should not contain particles larger than 20mm, with no more than 10% of such particles. The maximum size of soil particles should not exceed 50mm.
2. There should be no undigested lime particles or stones larger than 10mm in the mixture.
3. The lime soil must be thoroughly mixed to ensure a uniform color and consistent texture.
4. After being compacted with a 12-ton steel roller, the depth of wheel marks should not exceed 5mm.
5. The surface of the lime soil base layer should be free from floating soil, peeling, looseness, or slurry.
6. The allowable deviation for the quality of the lime subbase is detailed in the table below.
**Lime Soil Base Quality and Requirements**
| Project | Quality Requirements | Allowable Deviation | Inspection Frequency | Inspection Method |
|--------|----------------------|---------------------|----------------------|-------------------|
| Unconfined Compressive Strength (MPa) | R7=0.6~0.8 MPa | ±0.1 | Track area: 1 point; Tian Sai District: 1 point | On-site sampling |
| Ash Content | As per design | Not lower than | Track area: 1 point; Tian Sai District: 1 point | EDTA titration |
| Compaction | Heavy compaction 95%, Light compaction 98% | Not lower than | 1000m² | Sand filling method |
| Smoothness | Track area: 10mm; Tian Sai District: 10mm | ≤10mm | 20m projects | 3m straightedge |
| Cross Slope | Track area: 0.1%; Tian Sai District: 0.1% | No greater than | 20m projects | Water level meter |
| Elevation | Track area: 10mm; Tian Sai District: 10mm | No greater than | 20m projects | Water level meter |
| Width | Design width + B | Not less than | 40m | Steel ruler |
| Thickness | Design thickness | ±10mm | 1000m² | On-site thickness measurement |
**Notes:**
1. The "Tian Sai District" refers to areas used for competition events such as long jump and high jump.
2. Each test point is randomly selected, and the error is calculated based on the maximum deviation.
3. The cross slope result should not exceed 1%.
4. Compaction degree refers to the ratio of the optimal density.
5. "B" is an additional width added during construction, generally not less than 30cm.
These standards ensure that the lime soil base layer meets the required performance criteria, providing a solid and stable foundation for further construction. Following these guidelines will help prevent future structural issues and ensure the longevity of the road or track.
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