190 SECTION 401
401.01 Description
This work consists of preparing and treating a surface with bitumen.
401.02 Equipment
Equipment Section Bituminous Tank Trucks 152.01 E Storage and Heating Equipment 154.01 B Liquid Bitumen Distributors 154.02 B Aggregate Spreader 154.02 C
401.03 Materials
A.General. Material Section Water 812 Blotter Sand, Class 44 816 Emulsified asphalt may be diluted with water. When diluting emulsified asphalt, the amount of water added to the dilution shall not exceed the amount of emulsified asphalt. Obtain samples of the bitumen under the observation of the Engineer. The Engineer will take immediate possession of the samples .
B.Prime Coat. Use MC 70 or MC 250 that meets the requirements of Section 818.02 C, “Medium -Curing Cutback Asphalt” .
C.Tack Coat. Use a material from Table 401-01. Table 401 -01 Material Section SS-1h 818.02 F MS-1 818.02 F CSS-1h 818.02 E.1 When MS -1 is used it may be diluted by the supplier or the Contractor.
D.Fog Seal. Use a material from Table 401-02. Table 401 -02 Material Section SS-1h 818.02 F CSS-1h 818.02 E.1
401.04 Construction Requirements
A.Application of Bitumen.
1.General. Prepare the surface by removing loose dirt and deleterious material. Provide the Engineer with the manufacturer recommended application temperature ranges. During application, maintain the temperature of bitumen within the ranges recommended by the manufacturer. Apply bitumen with a distributor on a compacted and stable surface. Use hand sprayers to cover irregular areas. Completely cover the area receiving the bitumen application. If applying bitumen in multiple passes, overlap the bitumen along adjoining edges of the passes. Protect the surfaces of structures and other roadway appurtenances against tracking and splattering.
2.Prime Coat. Apply prime coat when the ambient air temperature is at least 40°F. Allow the prime coat to cure a minimum of 48 hours before placing pavement.
3.Tack Coat. Apply tack coat when the air temperature and existing mat temperature are at least 35°F. Apply tack coat to a dry surface. Allow tack coat to cure before applying surfacing material.
4.Fog Coat. Apply fog coat when the ambient air temperature is at least 40° F. Apply fog coat to a dry surface.
B.Application of Blotter Material. Obtain the Engineer’s approval before applying blotter material. The Engineer may order an adjustment to the rate of application for blotter material. If it is impractical to prohibit traffic from use of the primed surface for 48 hours, the Engineer may order the spreading of blotter material after the application of prime coat.
C.Opening to Traffic. Only allow traffic on a bitumen treated surface after the bitumen has penetrated and dried or after application of blotter material. 192 401.05 METHOD OF MEASUREMENT The Engineer will measure as specified in Section 109.01, “Measurement of Quantities”. The Engineer will measure undiluted emulsified asphalt to determi ne the quantity for payment.
401.06 Basis of Payment
Pay Item Pay Unit Tack Coat Gallon Prime Coat Gallon Fog Seal Gallon Blotter Material CL 44 Ton or Cubic Yard Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. Section 411 193 SECTION 411 MILLING PAVEMENT SURFACE
411.01 Description
This work consists of milling pavement surface.
411.02 Equipment
Equipment Section Milling Machine 156.03
411.03 Materials
Reserved.
411.04 Construction Requirements
Remove deleterious material fr om the pavement before milling. Mill the surface parallel to the centerline, beginning at the centerline and progressing outward to the edge of pavement. If using the adjacent lane for traffic, do not leave a longitudinal drop off in place for greater than one day. Provide a smooth trans ition to the original pavement surface when stopping. Mill the surface to prevent water from ponding on surface. Provide a milled surface free of irregularities exceeding 1/4 inches when measured with a 10 foot straightedge. Remove loose material from the milled sur face before opening to traffic. Coordinate milling and paving operations so that no section of milled roadway has public or construction traffic operating on it for more than 5 days. If public or construction traffic operates on the milled surface for more than 5 days, repair the roadway as directed by the Engineer at no additional cost to the Department.
411.05 Method of Measurement
The Engineer will measure, as specified in Section 109.01, “Measurement of Quantities”.
411.06 Basis of Payment
Pay Item Pay Unit Milling Pavement Surface Ton or Square Yard Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified.
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 225–227 of 550.