315.01 Description.
The contract price shall also be full compensation for the Contractor to take ownership of a device designated for disposal by the Department and full compensation for the costs of obtaining, transporting and disposing the device.
c.Payment will be made under Item No.: 306-A Portable Nuclear Moisture -Density Testing Device - per each 306-B State Retained Portable Nuclear Moisture -Density Testing Device - per each 306-E State Retained Portable Nuclear Moisture -Density Testing Device (Includes Disposal of Existing Device) - per each SECTION 315 DRAINAGE PLANE LAYER
315.01 Description.
This Section shall cover the work of constructing a drainage plane layer composed of an approved free-draining material. This layer normally is used to facilitate drainage from the pavement structure layer through the shoulders; however, it may be used at other locations when shown on the plans or directed.
315.02 Materials.
Materials for use shall meet the appropriate requirements of Division 800, Materials, with specific reference to Section 822.
315.03 Construction Requirements.
The drainage layer shall be constructed in reasonably close conformity to the cross sections and dimensions shown on the plans and in the sequence noted in Subarticle 301.04(c). The thickness shown on the plans will be loose measurement before covering with another layer. The drainage plane materials shall be spread by approved equipment capable of providing a single layer of uniform thickness, uncompacted, and continuous from the inner base layer edge through the shoulder line. The equipment must be capable of spreading this layer without damaging or disturbing the underlying and contiguous layers. Multiple pas ses may be permitted on wide shoulders. There will be no density requirement for this layer. Care shall be taken to insure firm contact between drainage layer and the contiguous base layers. Any disturbance to or loss of drainage plane material while uncov ered shall be corrected prior to placing the overlying layer.
315.04 Method of Measurement.
Measurement of Drainage Plane Material will be in accordance with Article 301.07.
315.05 Basis of Payment.
a.Unit Price Coverage . Drainage Plane Material, measure d as noted above, will be paid for at the contract unit price bid for the item of work involved in accordance with Article 301.08.
b.Payment will be made under Item No .: 315-A Drainage Plane Material, ___ inches {mm} Thick - per square yard {square meter} PLANT MIX BITUMINOUS BASE AND PATB
327.01 Description.
The work under this Section shall consist of constructing a Plant Mix Bituminous Base layer composed of an aggregate an d bituminous material hot mixed in a central plant and hot laid on a prepared surface in accordance with these specifications and in close conformity with the lines, grades, typical section, mix, and average weight per square yard shown on the plans or directed by the Engineer.
327.02 Materials.
The work under this Section shall also include the construction of a Permeable Asphalt Treated Base (PATB) layer to serve as a drainage layer in the pavement structure.
327.02 Materials.
a.Plant Mix Bituminous Base .
1.Compliance w ith the Requirements given in Section 410. The material requirements for Plant Mix Bituminous Base shall conform to the requirements given in Section 410 unless noted otherwise by the requirements given in this Section.
2.Mix Design. The type of required mix will be shown on the plans. The minimum allowable VMA shall be 13.0. The job mix shall be designed by the Marshall Method to produce a minimum of 1200 pounds {5.5 kN} stability at 50 blows, unless shown otherwise on the plans.
3.Aggregate. Fine aggreg ate shall meet the requirements given in Article 802.04. Coarse aggregate shall be gravel, processed reef shell, crushed slag, crushed stone, or a combination thereof meeting the requirements given in Section 801 unless noted otherwise by the requirements given in this Section. The coarse and fine aggregates shall be combined in a total blend that will produce an acceptable job mix within the gradation limits shown in the following table. The blend shall be made from at least two stockpiles of different gra dations. At least 10% of the blend shall be taken from each of the stockpiles. The requirements for allowing the use of RAP and RAS are given in Article 410.02. AGGREGATE FOR PLANT MIX BITUMINOUS BASE AND PERMEABLE BASE SIEVE PERCENT PASSING BY WEIGHT {MASS} Plant Mix Bituminous Base Permeable Base (Square Mesh Type) Mix 1 Mix 2 * PATB 2 inch {50 mm} Sieve 100 1.5 inch {37.5 mm} Sieve 100 82 - 97 100 1 inch {25.0 mm} Sieve 95 - 100 95 - 100 3/4 inch {19.0 mm} Sieve 80 - 95 55 - 85 1/2 inch {12.5 mm} Sieve 64 - 84 25 - 60 3/8 inch {9.5 mm}Sieve 56 - 74 40 - 65 No. 4 {4.75 mm} Sieve 40 - 56 30 - 52 0 - 10 No. 8 {2.36 mm} Sieve 28 - 42 22 - 42 0 - 5 No. 16 {1.18 mm} Sieve 20 - 34 No. 30 {600 µm}Sieve 13 - 26 No. 50 {300 µm} Sieve 8 - 20 5 - 22 No. 100 {150 µm} Sieve 4 - 14 1 - 18 No. 200 {75 µm} Sieve 2 - 6 0 - 8 0 - 4 * Mix 2 is intended to be used as a narrow width buildup in widening projects. All design criteria on Mix 2 is waived due to the size of the coarse aggregate. The M & T Engineer will determine the liquid asphalt binder content and gradation within th e general composition of the mix.
4.Liquid Asphalt Binder. If the grade of liquid asphalt binder is not shown on the plans the Contractor shall use PG 67 -22 liquid asphalt binder. The proportion of liquid asphalt binder to total sample by weight shall be 3.5 % to 7.0 % for Mix 1 and 3.0 % to 6.0 % for Mix 2. The exact proportion shall be fixed by the j ob mix formula. Additives or modifiers shall be used to prevent stripping of liquid asphalt binder if stripping is observed during design, production or laydown. These additives or modifiers shall be furnished and used at no additional cost to the State.
327.03 Construction Requirements.
b.Permeable As phalt Treated Base Mix (PATB).
1.Compliance with the Requirements given in Section 410 . The material requirements for PATB shall conform to the requirements given in Section 410 unless noted otherwise by the requirements given in this Section. The laying temperature for the mixture shall be as directed by the Engineer.
2.Mix Design. PATB shall be open graded, hot laid, central plant mixed, asphalt base material with no requirement for density, air voids, VMA, or stability. The mix shall be designed with a target liquid asphalt binder content of 2.0 to 3.0 %.
3.Aggregate. PATB shall be made with crushed stone meeting the requirements given in Section 801 unless noted otherwise by the requirements given in this Section. The crushed stone shall meet the gradation requirements given in the table AGGREGATE FOR PLANT MIX BITUMINOUS BASE AND PERMEABLE BASE in this Section. The blend shall be made from at least two stockpiles of different gradations. At least 10% of the blend shall be taken from each of the stockp iles. The requirements for allowing the use of RAP and RAS are given in Article 410.02.
4.Liquid Asphalt Binder. If the grade of liquid asphalt binder is not shown on the plans the Contractor shall use PG 67 -22 liquid asphalt binder. The proportion of liq uid asphalt binder to total sample by weight shall be 2.0 % to 3.0 %. During the drying process, the aggregate shall not be heated to a temperature greater than 280 °F {138 °C}. The liquid asphalt binder and the dried aggregate shall be mixed in such a man ner that the finished mixture shall not exceed 250 °F {121 °C}. Additives or modifiers shall be used to prevent stripping of liquid asphalt binder If stripping is observed during design, production or laydown. These additives or modifiers shall be furnished and used at no additional cost to the State.
5.Geotextile Filter. The geotextile filter shall comply with the requirements given in Section 604, Geotextiles In Permeable Asphalt Treated Base Application.
c.Sampling and Testing Frequency . The sampling and testing requirements for Plant Mix Bituminous Base and Permeable Asphalt Treated Base are given in Article 106.09.
327.03 Construction Requirements.
a.Plant Mix Bituminous Base . The construction requirements for Plant Mix Bituminous Bas e shall be the requirements given in Section 410 unless noted otherwise by the requirements in this Section. The edges shall be trimmed immediately after final rolling, using an accurately aligned string or wire to a tolerance of 2 inches {50 mm} outside the theoretical edge of the layer and to a slope not flatter than 1:1. Any edge distorted by rolling shall be promptly corrected.
b.Permeable Asphalt Treated Base Mix (PATB). The construction requirements for Permeable Asphalt Treated Base shall be the r equirements given in Section 410 unless noted otherwise by the requirements in this Section. A static steel wheel roller shall be used to compact the permeable base applying 0.5 to 1.0 tons per foot of roller width {1.5 to 3.0 metric tons per meter of rol ler width}. The roller shall make one to three passes, as directed by the Engineer, when the temperature of the mixture reaches approximately 150 °F {66 °C}. No portion of the PATB layer shall be exposed to the elements between laydown and cover for more t han five calendar days. When required, the geotextile filter shall be furnished and installed to comply with the requirements of Section 604 or as shown on the plans or directed by the Engineer. If rutting of PATB occurs when placing the next layer due to grade of roadway, temperature of the PATB, etc., the Engineer may require the use of a tracked paver.
327.05 Basis of Payment.
No traffic shall be allowed to operate or park on the travel lane or outside shoulder portion of the permeable base. Limited operation of equipment, e.g. delivery vehicles may be permitted on the inside edge.
327.04 Method of Measurement.
Measurement of the work included under this Section will be as provided in Article 410.08.
327.05 Basis of Payment.
a.Unit Price Coverage . Payment for the work included under this Section will be as provided in Article 410.09. For Pay Item 327 -E, payment for furnishing and installing a required geotextile filter will not be included in this item of work. The payment for furnishing and installing a required geotextile filt er will be included in Pay Item 604 -A, Separative Geotextile.
b.Payment will be made under Item No .: 327-A Plant Mix Bituminous Base, Mix - per ton {metric ton} 327-B Plant Mix Bituminous Base, Patching, Mix - per ton {metric ton} 327-C Plant Mix Bituminous Base, Leveling, Mix - per ton {metric ton} 327-D Plant Mix Bituminous Base, Widening, Mix - per ton {metric ton} 327-E Permeable Asphalt Treated Base - per ton {metric ton}
401.01 Description.
Division 400
SURFACING AND PAVEMENTS SECTION 401 BITUMINOUS SURFACE TREATMENTS
401.01 Description.
a.General . The work covered by this Section consists of basic bituminous treatments such as prime coat, asphalt flush coats, liquid seals, a nd bituminous surface treatments. This Section also covers the work of applying a bituminous surface treatment containing a polymer additive. Each bituminous treatment shall consist of one or more hot applications of bituminous material and, except for pri me coats, includes a specified cover aggregate which shall be spread after each bituminous application. The work also includes the cleaning of the existing surfaces as well as furnishing and applying all materials, and necessary incidental work thereto, al l in accordance with plan details and these Specifications.
b.Bituminous Treatment Table . The following table shows the amount of bituminous material and the size and amount of cover aggregate required for the various types of bituminous treatments. The types are designated in the table by letters of the alphabet such as A, B, C, D, etc. The proposal will designate in the pay item description which of the various types are to be used. The kind of bitumen may also be specified or, if none is specified, the Contractor may select one of the kinds, if not in conflict with other provisions of these Specifications, permitted by the table. All other requirements of the tabular line opposite the type designation shall apply. (Example: A bituminous treatment Type A KG, specifies a prime coat with the quantities specified on line "A", covered by a single surface treatment with the quantities specified on line "K", covered in turn by a seal treatment with the quantities shown on line "G".) Bituminous materials shall be placed within the tolerance specified by the table for the type treatment involved, unless otherwise ordered by the Engineer in writing. Any variation outside of the designated limits shall be cause for ordering the treatment to be removed and replaced or corrected as directed by the Engineer, all without additional cost to the Department. The rate of aggregate coverage shown by the table is the approximate rate found to produce an acceptable coverage when properly applied. Regardless of the rate shown, th e Contractor shall provide aggregate in sufficient quantities and so spread the aggregate that the bitumen is uniformly and evenly covered. The Engineer will notify the Contractor in writing should it become advisable to change the amounts of any material from the limits specified in the table. In such event an adjustment in the contract unit price will be made as specified in Subarticle 401.06(a).
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 179–182 of 934.