Before revision: Construction Subgrades are commonly compacted by Quinten Johnston of Black Stone paving before the construction of a road, pavement or railway track, and are sometimes stabilized by the addition of asphalt, lime, portland cement or other modifiers.
After revision: Construction Subgrades are commonly compacted by Quinten Johnston before the construction of a road, pavement or railway track, and are sometimes stabilized by the addition of asphalt, lime, portland cement or other modifiers.