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用二灰砂砾作公路路面结构的基层，可在不中断交通情况下施工。基层整体强度高，板体结构比较好，水稳性好，便于施工，降低工程造价，并可废物利用，保护环境。
With lime-gray gravel for the pavement structure of grass-roots level, construction can be carried out without interruption of traffic conditions. The overall grass-roots high strength, plate structure is better, good water stability, ease of construction, reduce construction costs, and waste utilization, environmental protection.