After mixing limestone soil, it needs to be properly paved and compacted. Two critical tasks must be completed during the paving process. First, the moisture content should be adjusted to the optimal level. One common method for checking this is the oven-drying test, which measures the water content. Another practical approach is the "hand test," where a handful of lime soil is squeezed. If it forms a ball without leaving a watermark and breaks into small pieces when dropped from 50 cm, or loosens when dropped from 100 cm, it indicates that the moisture content is suitable. The second task involves controlling the virtual thickness of the layer. If the virtual thickness is not properly managed, it can lead to uneven compaction, making trimming difficult. The virtual thickness is typically 1.6 to 1.8 times the actual required thickness, allowing for manual leveling before rolling. The table below shows the recommended paving thicknesses for different lime soil mix ratios.

Lime Soil Paving Thickness

Thickness	15 (cm)			20 (cm)
Paving Thickness Mix ratio	Soil thickness (cm)		Lime thickness (cm)	Soil thickness (cm)		Lime thickness (cm)
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

Once the lime soil has been paved, it's essential to double-check the design elevation and slope to ensure accuracy. After paving, the following steps are typically performed: **Step 1: Initial Rolling and Adjustment** This step serves as the final check before full compaction. Using a 6–8-ton light steel roller or a crawler tractor, the soil is rolled slowly from low points to high areas. After two passes, the surface is inspected for cracks, peeling, dryness, or loose spots. Any issues are addressed immediately, and the area is leveled before proceeding. **Step 2: Re-Compaction** Following the initial adjustment, a 12-ton steel wheel roller is used to recompact the surface. Starting from the lowest point, the roller moves at a speed of 60–70 meters per minute, completing 4–6 passes with each pass overlapping by 1/2 to 1/3 of the wheel width. **Step 3: Final Inspection and Trimming** After compaction, a thorough inspection is conducted for density, flatness, and overall quality. High areas are trimmed using a leveling machine, while low areas are planed 8–10 cm deep, refilled with fresh lime soil, and compacted again manually. Typically, 4–6 passes are sufficient to complete the process. 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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