Lime soil, once mixed, needs to be properly laid and compacted. Two essential tasks must be completed during the paving process. First, the moisture content should be controlled at or near the optimal level. One common method for checking this is the oven-drying method, which measures the water content. Another practical approach involves taking a handful of lime soil; if it forms a clump when squeezed and doesn’t leave a wet mark on your hand, and when dropped from 50 cm, it breaks into small pieces, and when dropped from 100 cm, it falls apart into a loose state, it is considered to have the correct moisture content.
The second task involves controlling the virtual thickness of the lime soil layer. If the virtual thickness is not properly managed, it becomes difficult to trim after compaction, leading to uneven areas. Typically, the virtual thickness is 1.6 to 1.8 times the actual structural thickness. With manual leveling, it can be rolled effectively. The table below shows the recommended paving thicknesses for different lime soil mixtures.
**Lime Soil Paving Thickness**
| Thickness | 15 (cm) | 15 (cm) | 15 (cm) | 20 (cm) | 20 (cm) | 20 (cm) |
|-----------|---------|---------|---------|---------|---------|---------|
| | Soil | Soil | Lime | Soil | Soil | Lime |
| | (cm) | (cm) | (cm) | (cm) | (cm) | (cm) |
| Paving Thickness | | | | | | |
| Mix Ratio | | | | | | |
| 10% Lime Soil | 15~16 | 22~24 | 5 | 20~21 | 30~32 | 7 |
| 12% Lime Soil | 15~16 | 22~24 | 6 | 20~21 | 30~32 | 8 |
| 14% Lime Soil | 15~16 | 21~23 | 7.8 | 20~21 | 28~31 | 10.5 |
After laying the lime soil, it's important to recheck the design elevation and slope to ensure accuracy. Once the lime soil is laid, the following steps are typically carried out:
**Step 1: Leveling and Adjustment**
This step serves as the final check before compaction and is crucial for ensuring proper density. Using a 6–8 ton light steel roller or a crawler tractor, the surface is rolled slowly from low to high points. After two passes, the area is inspected for elevation, slope, thickness, and any signs of cracking, peeling, dryness, or instability. Any issues found are addressed immediately, and the surface is leveled accordingly. This step is essential before proceeding with rolling.
**Step 2: Initial Compaction**
Following the adjustment, the next step is initial compaction using a 12-ton steel wheel roller. Starting from the lowest point, the roller moves at a speed of 60–70 meters per minute, making 4–6 passes. Each pass overlaps the previous one by 1/2 to 1/3 of the rear wheel width. This ensures even compaction and stability.
**Step 3: Final Inspection and Adjustments**
After compaction, an inspection is conducted for compaction, flatness, and overall quality. Areas that are too high can be trimmed using a leveling machine, while lower spots are first planed down 8–10 cm, then filled with fresh lime soil mixture. After leveling, the area is manually compacted and rolled again, typically 4–6 times, to achieve the desired density.
Finally, after rolling, the lime soil base should be watered and cured for at least 7 days to ensure proper strength development.
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