408.1 Description. This work shall consist of preparing and treating an existing surface with bituminous
material in accordance with these specifications, as shown on the plans or as directed by the engineer.
408.2 Material. The type and grade of bituminous material will be specified in the contract. Liquid asphalt may
be changed one grade by the engineer during construction at no change in the contract unit price. All material shall be in accordance with Division 1000, Material Details, and specifically as follows: Item Section Type RC and MC Liquid Asphalts 1015 Emulsified Asphalt 1015
408.3 Equipment. Equipment shall be in accordance with Sec 407.
408.4 Construction Requirements.
408.4.1 Preparation of Surface. The surface to be primed shall be shaped to the required grade and cross
section, shall be free from all ruts, corrugations, segregated material or other irregularities, and shall be uniformly compacted by rolling. The surface shall be firm and slightly damp when primer is applied. Delays in priming may necessitate reprocessing or reshaping to provide a smooth compacted surface.
408.4.2 Application. Bituminous material shall be applied to the width of the section to be primed by means of
a pressure distributor in a uniform, continuous spread. The application rate shall be as specified in the contract, or as revised by the engineer between 0.2 and 0.5 gallon per square yard. The primer shall be heated at the time of application in accordance with the limits provided in Sec 1015.
408.4.2 1 There shall be no overlapping of bituminous material. Pools of primer material remaining on the
surface after the application shall be removed. As soon as the bituminous material has been absorbed by the surface and will not track, traffic may be routed onto the treated traveled way. Any damage caused to the prime coat due to the contractor’s equipment or decision to allow traffic on the roadway too soon shall be primed again at the contractor’s expense.
408.4.2 2 The primer shall be properly cured and the primed surface shall be cleaned of all dirt and surplus sand
before the next course is placed.
408.5 Method of Measurement. Bituminous material will be measured to the nearest gallon and adjusted for
temperature correction in accordance with Sec 1015.
408.6 Basis of Payment. The accepted quantities of prime coat will be paid for at the contract unit price for
each of the pay items included in the contract. No direct payment will be made for furnishing or applying any water required for dampening the surface to be primed.
Prime Coat in other states
Get an email when 408 changes
Missouri revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.