Lime soil base layer construction quality requirements are essential to ensure the durability and stability of the foundation. The following guidelines outline the key aspects that must be 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 largest soil particle size 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 achieve a uniform color and consistent texture.
4. After being compacted with a 12-ton steel roller, the wheel track depth should not exceed 5mm.
5. The surface of the lime soil base 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 / Tian Sai District: 1 | On-site Sampling |
| Ash Content | Design Requirements | Not lower than | Track Area: 1 / Tian Sai District: 1 | 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 Ruler with Feeler |
| Cross Slope | 0.1% | No greater than | 20m Projects | Water Level Meter |
| Elevation | 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. "Tian Sai District" refers to areas used for competition events like long jump, high jump, etc.
2. Each test point is randomly selected, and the error is based on the maximum value.
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 value added during construction, generally not less than 30cm.
These standards are crucial for ensuring that the lime soil base meets the required performance criteria and supports the structural integrity of the road or pavement above. Proper adherence to these specifications will help avoid future issues such as cracking, settling, or uneven surfaces. Always conduct regular inspections and follow the recommended testing procedures to maintain quality throughout the project.
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