| B. | Traffic Control: |
| 1. | Control pedestrian and vehicular traffic, Section 01 55 26. |
| 2. | Apply temporary traffic and lane marking tape or paint after layout and placement has been verified with COR. |
| 3.3 | PREPARATION OF AGGREGATE |
| A. | On unpaved surfaces, prime coat whole roadway surface receiving cold-mix application, Section 32 12 10. |
| B. | Place aggregate to be mixed with bitumen on the prepared base in a uniform windrow or windrows. |
| C. | Notify COR 48 hours in advance of applying the bituminous material to permit review of the aggregate with respect to volume, moisture content, and unit weight, and the proper amount of bituminous material to be used. |
| 3.4 | PROPORTIONING AND MIXING |
| A. | Unless specified otherwise, method of mixing may be selected from a traveling mixer method, stationary mixer method, or blade mixing method. |
| B. | Traveling Mixer Method: |
| 1. | Accomplish mixing by means of mixer that will thoroughly blend the aggregate and bitumen. Use metering devices that will accurately introduce required quantity of bitumen during the mixing process. Produce a satisfactory mixture that is uniform in appearance, texture and bitumen content, and free from pockets of segregated aggregates. |
| 2. | When necessary, supplement travel plant mixing with blade mixing to obtain the desired degree of aeration of the mix. Continue mixing until not more than 50 percent of the original volatiles present in the bituminous material remain in the mix, ASTM D 1461. |
| C. | Blade Method: |
| 1. | Spread the windrowed aggregate on the prepared base, after which, uniformly apply the bituminous material over the aggregate. |
| 2. | Apply the bituminous material in 2 or more applications over a section of definite limits. Limit the amount of bitumen spread in any 1 application to 0.50 gallon per square yard. Exercise care to avoid overlapping of spreads onto adjoining sections. Immediately after each application, partially mix the bituminous material with the aggregate. |
| 3. | After the last application of bituminous material and partial mixing, windrow the entire mass of bitumen and aggregate and mix by blading the material from side to side of the roadway. Blade to produce a satisfactory mixture that is uniform in appearance, texture, and bitumen content, and free from pockets of segregated aggregates and continue until not more than 50 percent of the original volatiles present in the bitumen remain in the mix, ASTM D 1461. While mixing, take care to avoid cutting into the underlying base course or contaminating the bituminous mixture with earth or other foreign matter. |
| D. | Stationary Mixer Method: |
| 1. | Dry the aggregate to the optimum moisture content prior to mixing. Use the same application of bituminous material and mixing as required for traveling mixer. |
| 2. | After mixing, haul and place the material on the roadway surface in windrows. All requirements as to uniformity, percent of volatiles, and textures are as required for traveling mixer which may require supplemental blade mixing. |
| 3.5 | TEMPERATURE CONTROL |
| A. | Maintain the temperature range of the asphalt road mix material at the time of application so that the viscosity will be between 50 and 200 centistokes, ASTM D 2170. |
| 3.6 | PLACING PAVEMENT MIXTURE |
| A. | At the end of each day's work or when the work is interrupted by adverse weather conditions, blade all loose material into a windrow, whether mixing is completed or not. Do not leave material spread on the roadbed overnight. |
| B. | When mixing has been completed, form the mixture in a windrow or windrows and spread in such a manner that the finished surface conforms to the elevations, grades, and cross-sections indicated. |
