401.01 276 SECTION 401 – MINERAL AGGREGATE SURFACE
401.01 Description ................................ ................................ ................... 276
401.02 Materials ................................ ................................ ...................... 276
401.03 Equipment ................................ ................................ .................... 276
401.04 Construction Methods ................................ ................................ .. 277
401.05 Thickness and Surface Requ irements................................ ........... 278
401.06 Method of Measurement ................................ .............................. 278
401.07 Basis of Payment ................................ ................................ .......... 278
DESCRIPTION
401.01 Description
This work consists of furnishing and placing one or more courses of aggregates, and an admixture if required, on a prepare d surface. MATERIALS
401.02 Materials
Provide materials as specified in: Aggregate, Type B ................................ ............................. 903.05.B Calcium Chloride, Type I, Type 2, or Calcium Chloride Liquor ................................ ................ 921.02 The Engineer will accept aggregate for gradation as specified in 303.02. EQUIPMENT
401.03 Equipment
Provide equipment as specified in 303.06. 401.04 277 CONSTRUCTION REQUIREMENTS
401.04 Construction Methods
Obtain the Engineer’s approval of the completed roadbed before placing any surface material upon it. On projects not requiring placement of surface material over the entire width of the roadbed, blade sufficient subgrade materi al from the subgrade, forming windrows on the shoulders from which to complete the compacted shoulders to the required cross -section after completing the surface course. The surface course material may be spread with mechanical spreaders, dumped in windrow s, or end dumped. Use approved machine methods to spread material dumped in windrows or end dumped, taking care to destroy all compaction planes caused by dumping or hauling over the material. Construct the mineral aggregate surface in layers as shown on the Plans, with spreading, machining, sprinkling, and compaction operations progressing until the work is in reasonably close conformity to the lines, grades, and cross-sections shown on the Plans or established by the Engineer. Construct and maintain the surface of each layer to produce a uniform texture and to firmly key the aggregate. Uniformly apply water over the surface material during compaction in the amount necessary to ensure proper consolidation. Roll each layer using approved rollers until the surface is thoroughly compacted and approved by the Engineer. If the required compacted depth of the surface course exceeds 6 inches, construct the surface course in two or more layers of approximately equal thi ckness. The maximum compacted thickness of any one layer shall not exceed 6 inches; however, if using vibrating or other approved types of special compacting equipment, the Contractor may increase the compacted depth of a single layer of the surface course to 8 inches with the Engineer’s approval. If two or more sizes or types of aggregates are to be blended on the road, spread the different aggregates separately using an approved mechanical spreader that can be adjusted to spread the materials in the prop er proportions. After spreading the material, and additive if specified, perform mixing using an approved mechanical mixer that is capable of producing a thorough and intimate mixture of aggregates, additive, and water. Incorporate calcium chloride, if req uired, as specified in 303.08.B. 401.05 278 401.05 Thickness and Surface Requirements The thickness and surface of the completed Mineral Aggregate Surface shall meet 303.12 and 303.13. COMPENSATION
401.06 Method of Measurement
The Department will measure:
1.Mineral Aggregate Surface by the ton in accordance with 109.
2.Water added to the materials at the direction of the Engineer by the
M.G. (1,000 gallons) using calibrated tanks or distributors, or accurate water meters.
3.Calcium Chloride by the ton in accordance with 303.14.D. When measuring Mineral Aggregate Surface, the Department will deduct the weight of all surface moisture on the aggregate at the time of weighing in excess of 8%.
401.07 Basis of Payment
The Department will pay for accepted quantities of Mineral Aggregate Surface, complete in place, at the contract prices as follows: Item Pay Unit Mineral Aggregate Ton Calcium Chloride Ton Water MG 402.01 279 SECTION 402 – PRIME COAT
402.01 Description ................................ ................................ ................... 279
402.02 Materials ................................ ................................ ...................... 279
402.03 Equipment ................................ ................................ .................... 280
402.04 Limitations ................................ ................................ ................... 280
402.05 Preparing the Surface ................................ ................................ ... 280
402.06 Applying Priming Material ................................ .......................... 281
402.07 Applying Cover Material ................................ ............................. 281
402.08 Maintenance and Protection ................................ ......................... 281
402.09 Method of Measurement ................................ .............................. 282
402.10 Basis of Payment ................................ ................................ .......... 282
DESCRIPTION
402.01 Description
This work consists of applying bituminous material, and cover material if required, on a designated base. MATERIALS
402.02 Materials
Provide materials as specified in: Aggregate for Cover Material, Size 7, 8 , or 78 ...................... 903.13 Emulsified Asphalt, Grade AE -P, CAE-P, or tack coats in 403.02 ................................ ................................ ............... 904.03 When prime coat quantity is 6 tons or more, AE -P or CAE -P will be applied unless otherwise directed by the Department. Apply Emulsified Asphalt, Grade AE -P or CAE -P, at a temperature range of 60 to 140 °F.
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 285–287 of 1,072.