721— Asphalt Curb

721.1 Description

1 Construct asphalt curb.

721.2 Materials

1 Provide materials conforming to Section 403. Conform to the manufacture and hauling of the asphalt mixture specified in Sections 401 and 403.

721.3 Construction

721.3.1 Equipment

1 Construct asphalt curb by use of a self -propelled automatic curb machine or a paver with curbing attachments. 2 Ensure that the automatic curb machine meets the following requirements and is accepted by the RCE before use: • The automatic curb machine is constructed and is operated to consolidate the mixture to produce a dense mass free of voids. • The machine forms the curb true to line and grade and to a uniform shape and texture. 3 The RCE may permit the construction of curb by means other than the automatic curb machine when short sections or sections with short radii are required or for other reasons deemed warranted by the RCE. Ensure that the resulting curb conforms to the required curb as specified. 4 Ensure that the equipment necessary for the proper construction of the work is on site, in acceptable working condition, and approved by the RCE for both type and condition before the start of work.

721.3.2 Weather and Surface Temperature Restrictions

1 Do not construct asphalt curb when the pavement or base is wet or frozen.

721.3.3 Preparation of Bed

721.3.3 1 Subgrade

1 When the curb will be placed directly on the subgrade, prepare the subgrade according to Section 208 .