Macadam

Macadam is a type of road construction pioneered by Scottish engineer John Loudon McAdam around 1820. The method simplified what had been considered state of the art at that point. Single-sized aggregate layers of small angular stones are placed in shallow lifts and compacted thoroughly. A binding layer of stone dust, crushed stone from the original material may form; it may also, after rolling, be covered with a binder of fines and small crushed rock.

Predecessors

Pierre-Marie-Jérôme Trésaguet

Pierre-Marie-Jérôme Trésaguet is sometimes considered the first person to bring post-Roman science to road building. A Frenchman from an engineering family, he worked paving roads in Paris from 1757 to 1764. As chief engineer of road construction of Limoges, he had opportunity to develop a better and cheaper method of road construction. In 1775, Tresaguet became engineer-general and presented his answer for road improvement in France, which soon became standard practice there.

Trésaguet had recommended a roadway consisting of three layers of stones laid on a crowned subgrade with side ditches for drainage. The first two layers consisted of angular hand-broken aggregate, maximum size 3 inches (7.6 cm), to a depth of about 8 inches (20 cm). The third layer was about 2 inches (5 cm) thick with a maximum aggregate size of 1 inch (2.5 cm). This top level surface permitted a smoother shape and protected the larger stones in the road structure from iron wheels and horse hooves. To keep the running surface level with the countryside, this road was put in a trench, which created drainage problems. These problems were addressed by changes that included digging deep side ditches, making the surface as solid as possible, and constructing the road with a difference in elevation (height) between the two edges, that difference being referred to interchangeably as the road's camber or cross slope.

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Latest News for: macadam

MVP Arena GM Belber authors fun behind-the-scenes memoir 'Life with the Stars'

In Northville Zullo scandal, teammate shows grace, defiance, defense of teammate - A Seat in ...

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UAlbany women's basketball season continues with WBIT game at Saint Joseph's

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