SECTION 470—BITUMINOUS SEAL COAT 470.1 DESCRIPTION—This work is application of bituminous material, immediately followed by application of coarse aggregate. 470.2 MATERIAL— (a) Bituminous Material. One of the following, as specified in Section 702. Class of Material Type of Material Minimum Maximum RS-2PM Polymer-Modified Emulsified Asphalt 140 175 Polymer-Modified Cationic Emulsified CRS-2PM 140 175 Asphalt (b) Coarse Aggregate. Type A, No. 8Section 703.2 and with the SRL designated in the Contract Item. Supply aggregate from a source listed in Bulletin 14. The Contractor may use an aggregate or blend of aggregates with an SRL equal to or better than that specified. Blends are 50% by mass (weight) of the two aggregates. Mix the aggregates using an approved method. 470.3 CONSTRUCTION—At least 2 weeks before the scheduled start work, submit a seal coat design for the Representative’s review. Design the seal coat according to the method in Appendix E of Bulletin 27. If the source or gradation of aggregate changes or if type of bitumen changes, submit a new seal coat design. (a) Preparing Existing Surface. Remove and dispose of all unsuitable material. Where indicated, seal cracks as specified in Section 469.
SECTION 470—BITUMINOUS SEAL COAT 470.1 DESCRIPTION—This work is application of bituminous material, immediately followed by application of coarse aggregate. 470.2 MATERIAL— (a) Bituminous Material. One of the following, as specified in Section 702. Class of Material Type of Material Minimum Maximum RS-2PM Polymer-Modified Emulsified Asphalt 140 175 CRS-2PM Polymer-Modified Cationic Emulsified Asphalt 140 175 (b) Coarse Aggregate. Type A, No. 8Section 703.2 and with the SRL designated in the Contract Item. Supply aggregate from a source listed in Bulletin 14. The Contractor may use an aggregate or blend of aggregates with an SRL equal to or better than that specified. Blends are 50% by mass (weight) of the two aggregates. Mix the aggregates using an approved method. 470.3 CONSTRUCTION—At least 2 weeks before the scheduled start work, submit a seal coat design for the Representative’s review. Design the seal coat according to the method in Appendix E of Bulletin 27. If the source or gradation of aggregate changes or if type of bitumen changes, submit a new seal coat design. (a) Preparing Existing Surface. Remove and dispose of all unsuitable material. Where indicated, seal cracks as specified in Section 469.
F_Pub-408-Section-470-material-construction-changes_Redline.docx