7. Mix Placement
7.1 Introduction
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The placement operation (also known as laydown or paving) is a critical part of the construction of a quality, long-lasting asphalt pavement. It is important to understand the proper operation of the paving equipment and paving best practices to obtain a durable, smooth-riding pavement that meets the standards of quality construction. Some agencies require the contractor to submit a plan that outlines the practices and procedures that will be used during the laydown process. This is a great opportunity for both the contractor and agency to understand all aspects of the process to meet the agency’s specifications.
A paver is used to place asphalt mixture to the desired width, grade, cross slope, and thickness with a uniform mat texture, thus improving the rideability and smoothness of the roadway. There are two types of pavers-track (crawler) and rubber-tire (pneumatic)-which perform similar functions in a paving operation.
The track paver, on which the tracks may be all steel, steel equipped with rubber pads, or an endless rubber track, offers a high degree of flotation and traction. A rubber-tire paver has a much higher travel speed and is more maneuverable than a tracked paver. When set up and operated properly, both types can place a smooth, uniform mat to meet the required project tolerances.