5 , 000 Tons Grade “ B ” of Hot Mix Asphalt

2026-11-03

Materials : The bituminous material shall conform to Section 702 of the " Standard Specifications for Road and Bridge Construction " adopted by the Montana State highway Commission . a . Aggregate : The aggregate shall meet the requirements of Section 401 . 02 . 1 and Section 701 . 03 . 2 table 701 - 15 Grade B of the " Standard Specifications for Road and Bridge Construction ", Montana State Highway Commission . In addition the mix shall meet an index of 70 for retained strength as determined by ASTM D 1075 EFFECT OF WATER ON COHESION OF COMPACTED BITUMINOUS MATERIAL . b . Bituminous Material : The bituminous material shall be the type and grade specified and shall meet the requirements of Section AASHTO M 320 - 05 . The contractor will furnish the City of Missoula a job mix formula based upon a certified laboratory test , sieve analysis and grading and character of the aggregate including ASTM D 1075 , furnished within the specification limits . c . Mineral Filler : The mineral filler for use in the construction of hot plant mix , bituminous surfacing shall not exceed 15 % of the material retained on a No . 4 sieve . The materials shall be in conformance with Section 401 . 02 . 4 " Mineral Filler ", of the " Standard Specifications for Road and Bridge Construction ", Montana State Highway Commission . d . Performance Grade Asphalt Binder ( PGAB ): Performance grade asphalt binder shall be used as standard for all mix designs , PG 64 - 28 or PG 58 - 28 , meeting requirements of Section 702 and table 702 - 9 " Standard Specifications for Road and Bridge Construction ", Montana State Highway Commission . The successful bidder shall provide an asphalt cement mix design prior to plant start - up each year of if asphalt cement type changes during the course of contract . Mix designs shall be submitted to the Street Division Superintendent .

Montana

2026-04-29