CHAPTER VI

SAND-CLAY AND GRAVEL ROADS

The Binder--Top-soil or Natural Mixtures--Sand-clay on Sandy Roads--Sand-clay on Clay or Loam--Characteristics--Natural Gravel--The Ideal Road Gravel--Permissible Size of Pebbles-- Wearing Properties--Utilizing Natural Gravels--Thickness of Layer--Preparation of the Road--Trench Method--Surface Method--Maintenance 74-88