Method of paving

摘要

A machine for concurrently laying a dual-layered cementitious composition on a base surface with the layers having different compositions. A self-propelled main frame has an adjustable platform frame overlying the main frame. Adjustable support elements are coupled to the main frame for changing the position of the main frame to conform with the grade characteristics of the base surface. A first receiving unit is coupled to and is extended in front of the main frame and receives the first cementitious composition. The first receiving unit includes a first strike-off element extending transversely to the normal direction of movement of the machine and is spaced a predetermined distance above the base surface. Upon movement of the machine forwardly, a bottom layer of the first composition is formed and shaped. A second receiving unit is coupled to and is extended between the main frame and the first receiving unit for receiving the second cementitious composition. The second receiving unit also contains a second strike-off element which extends transversely to the normal direction of movement of the machine and is spaced a predetermined distance above the first strike-off means. Upon movement of the machine forwardly, an upper layer of the second composition is formed on top of the first layer. A longitudinally extending slip-form is suspended from the main frame rearwardly of the first and second receiving units. As the machine moves forward the slip form passes over the top of the second cementitious composition thereby finishing its top surface.