Airport Improvements - Laserfiche WebLink

Home

(2331 M) E. Mixture Proportions E1 Bituminous Material The percentage of asphalt cement, by weight in the mixture, shall be within plus or minus 0.3 percentage point of the amount designated by the Bituminous Engineer (or his designee). The spot check method, described in the Departments' Bituminous Manual, shall be used to monitor and control the amount of asphalt incorporated into the bituminous mixture during the mixture production. E2 Job-Mix Formula (J.M.F.) Delete 2331.3E2 and in lieu thereof use the following: (1) At least 15 days prior to the start of bituminous mixture production, the Contractor shall submit to the Department's Bituminous Engineer (or his designee) representative aggregate samples of each of the respective materials that he proposes to use in mix production. The submittal shall consist of approximately 300 pounds of aggregate material. If it is proposed to use multiple aggregate sources/ types, the 300 pounds may be proportioned to reflect the proposed blend (100 pound minimum). The aggregate samples shall be obtained from stockpile production. At the time of the aggregate(s) submittal, it is recommended that the Contractor also submit aggregate stockpile gradations for each of the different type of materials intended for use. The Contractor shall also indicate the proposed proportions of the aggregate materials to be incorporated into the mixture. (2) Using the representative aggregate samples submitted by the Contractor and the proposed mixture proportions; gradations and trial mix tests will be conducted to evaluate the acceptability of the proposed aggregate blend and the (composite) gradation (which will be referred to as the Job-Mix Formula - J.M.F.) and to establish the percentage of asphalt cement (by weight of total mixture) to be used in production of the bituminous mixture. Mixture evaluation will be based on the trial mix tests and the corresponding requirements listed below. -3-