1990 1800 spec book scan.pdf

The aggregates, mineral filler (if required), and asphalt c shall be combined as necessary to produce a mixture propor

Table 7.10-2 hdaster Gradation Range, Percent Bitumen, and within the master gradation range limits shown in Table 7.10- Crushed Particle Content for Bituminous Mixtures meeting the uniformity tolerance limits shown in Table 7.1 Total Percent Passing Designated Sleve for Applicable Biluminous Mixlure (a) clay, or loam shall not be added to aggregates which are to be use NO. 1800 NO. 1800 plant mixed bituminous mixtures. No. 1500 No. 1500 No. 1100 No. 1100 No. 1100 No. 900 No. 900 No. 900 No. 700 Curb

After the job-mix-formula is established, the aggrega NO. 1300 NO. 1300 No. 500 Mixlure and the bitumen content of the bituminous mixture furn (36~)(368) (ZOAAA) ( 3 6 ~ ~ 3 6 8 ) (20AA) (20A) (20AA) (20A) (208) (20C) (e) work shall be maintained within the Range 1 uniformity t its permitted for the job-mix-formula as specified herein - 80.100 - 7.10-3. However, if the deviations are preponderantly either be1 - l o o - loo l o o loo l o o l oo

- 100 above the job-mix-formula, the Engineer may order alteration loo 90.100 IW go-loo - 90.100 -

92-100 65-95 92-100 65-95 60-90 65-95 60-90 60-95 55.90 75.90 plant to bring the mixture to the job-mix-formula, If two con 65-90 55-75 65.90 - - - - - - -aggregate gradations on one sieve, or bitumen contents as mined by the field extractions, are outside Range 1 but within 2 tolerance limits, the Contractor shall suspend all operatio tract time will continue during these times when the plant is Before resuming any production, the Contractor shall propose, Engineer's approyal, all necessary alterations to the mater plant so that the job-mix-formula can be maintained. The after evaluating for effects on AWI and mix design prope approve or disapprove such alterations. If the aggregate ble jh) The Job-Mix-Formula shall have a minimum total percent passing a No. 200 sieve of 5.0 percenl.

portion or the crushed particle content are not as specified in (c) The percent of bitumen in the mixlure shown in Table 7.10-2, is a range and Ihe actual bitumen contenl in the production mixlure shall be as mix-formula, the Engineer may require a new mix design. determined by the JO~M~X- orm mu la. For mixtures NO, 900, 1100, 1300, 1500, and 1800 placed in IWO courses, Ihe leveling course will be

Field extraction tests will be made by the Engineer for accepta designed to have up to 0.5 percent less bitumen than the optimum specified for the top course. Mixtures NO. 500 and 700 will be designed to have a target air void 01 4.0 percent.

testing. Quality control measures to insure job control are the res (d) 3 6 ~ = ~0%: 368 = 40~10.

sibility of the Contractor.

The crushed particle content of the aggregate used in the b

(e) The mixture proponions may be varied from the limits shown so as to make a quality bituminous curb mixture as determined by Ihe Engineer.

If a qualily bituminous curb mixture can not be made using the original malerial submitted, the Engineer will require the Contractor l o submil a nOUS mixture shall not be more than 10 percentage points set of diverent materials meeting the requirements of Subsection 4.22.02 wilhoul any change in the contract unit price.

crushed particle content used in the job-mix-formula nor les minimum specifiedfor the aggregate in Table 7.10-2.

Rejected Mixtures.-If in any one mixture, two consecutive gate gradations on one sieve or bitumen content as determi field extractions exceed the uniformity tolerance of Range 2 Table 7.10-3, or do not meet the minimum requirements for c particle content in Table 7.10-2, the mixture will be rejected. I mixtures are placed in a pavement, the remaining portions failing field samples (split sample) will be sent to the Michigan ment of Transportation's Testing Laboratory to confirm th traction test results. If the Laboratory's results do not confirm th extraction test results and there are no price adjustments re due to test failures on the asphalt, then no price adjustments made for the mixture involved. If the Laboratory's results field extraction test results and if in the Engineer's judg er listed on the JMF.

fective areas warrant removal, the Contractor shall remove e amount of reclaimed asphalt pavement blended wi lh new dense-graded aggregate is place the areas, at the Contractor's expense, with mixtures specification requirements. If the Laboratory's results con

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7.10.04 7.10.06 BITUMINOUS MIXTURE PRODUCTION The percentage of new asphalt cement to be added to the mixture

7.10.04 Preparation of Bitumi will be determined by the Laboratory using the Manual for Bituminous materials shall be heated in such Mix Design Processing.

heating of the entire mass, with an times. They shall be heated to a tem

d. Using More Than 15 Percent Reclaimed Asphalt Pavement of material being used except that Up to a Maximum of 50 Percent.-When the amount of reclaimed the bituminous material or bitumin temperature specified in Table 8.04-6. Any bituminous mat has been over-heated and which, in the opinion of the Engine been injured thereby will be rejected. Any bituminous material is contaminated will be rejected or will be subject to a

The percentage and grade of new asphalt cement to be added to the mixture will be determined by the Laboratory using the Manual for adjustment. Bituminous Mix Design Processing.

7.10.05 Preparation of Aggregates: The effective percent of asphalt cement required in the mixture may be increased if required due to use of highly absorbent

a. New Aggregates.-The aggregates shall be stockpiled at plant site in such a manner as to prevent them from s

Aggregates shall be dried to a moisture content th the Engineer will require a change in the specified grade of asphalt satisfactorily coated bituminous mixtures consistent with cement to be added to the mixture.

plant being used, For batch andlor continuous plants, if the gates placed in the hot bins contain sufficient moisture to 7.1 0.06 Composition of Bituminous Mixture.-The bituminous foaming or a soggy mixture, they shall be removed from the mixture required will be specified on the plans or in the proposal. The Material so removed may be returned to the back side o bituminous mixture shall be designed to meet the applicable require-stockpile. ments for stability, flow, voids in the mineral aggregate (VMA), and air voids as specified in Table 7.1 0-1.

b. Blending Aggregates.-The Contractor may elect to aggregates. When the Contractor so elects, blending shall accordance with the Manual for Bituminous Mix Design Pr

The Contractor shall provide uniformity in the gradations gregates placed in the cold feeds so'that the combinatio gates produced for the mixture by blending the aggregat or more cold feed bins will be within the job-mix-formula ances. All feeders shall be equipped with cutoffs which cally stop the operations of the asphalt plant at any time t aggregate is changed so as to affect the uniformity of the g the time a new job-mix-formula is being determined.

product. For drum plants, only one aggregate gradation shall from any single cold feed bin at any given time.

The Contractor has the option of using one or more hot proportioning the aggregates to meet the specified tolerances ever, the plant must still meet the cold feed requirements.

c. Using 15 Percent or Less Reclaimed. Asphalt Pave When the amount of reclaimed asphalt pavement to be ble new aggregate is 15 percent or less, the stockpile of recl phalt pavement shall be reasonably uniform in gradation an content. The preparation of the job-mix-formula and prod placement of the mixture shall be the same as that specifi tures using all new aggregates.

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