What materials are needed to build a highway?
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What materials are needed to build a highway? Such as cement, composite soil, curb stone, sand, etc.?
There is no need for "three combined soils" to build highways. Generally, the materials used in highway construction are soil, sand, gravel, lime, water stabilizer, asphalt concrete, etc.
It depends on the geological conditions. Generally, soil, sand, lime, water stabilizer, and asphalt concrete are available. For special geological conditions, such as frozen soil, some other materials will be added.