313.01 270 SECTION 313 – TREATED PERMEABLE BASE
313.01 D escription ................................ ................................ ................... 270
313.02 Materials ................................ ................................ ...................... 270
313.03 Composition of Mixtures ................................ ............................. 271
313.04 Equipment ................................ ................................ .................... 271
313.05 Construction Requirements ................................ .......................... 272
313.06 Limita tions ................................ ................................ ................... 273
313.07 Surface Requirements ................................ ................................ .. 273
313.08 Tolerance in Pavement Thickness ................................ ................ 273
313.09 Method of Measurement ................................ .............................. 274
313.10 Basis of Payment ................................ ................................ .......... 274
DESCRIPTION
313.01 Description
This work consists of constructing treated permeable base, composed of either a mixture of aggregate, Portland cement, and water, or a mixture of aggregate with asphalt binder, on a prepared sub -base. The Contractor may use either cement treated or asphal t treated permeable base. MATERIALS
313.02 Materials
Provide materials as specified in: Portland Cement, Type I ................................ ........................ 901.01 Aggregate for Portland Cement Treated Mixture .................. 903.03 Aggregate for Bituminous Tre ated Mixture ........................... 903.06 Asphalt Cement, Grade PG 64 -22, 70-22, 76-22, 82-22 ........ 904.01 Liquid Membrane – Forming Compounds ............................. 913.05 Water ................................ ................................ ...................... 921.01 313.03 271 313.03 Composition of Mixtures
A.Portland Cement Treated Permeable Base In accordance with 604, submit a concrete mix design, meeting the requirements specified in Table 313.03 -1, to the Engineer for approval. Table 313.03 -1: Mix Design Properties Property Value Water-Cement Ratio 0.43 (approximately) Portland Cement Content > 282 lbs/yd3 Compressive Strength at 7 days (AASHTO T 22) > 500 psi
B.Bituminous Treated Permeable Base Asphalt treated permeable base shall be Bituminous Plant Mix Base (Hot Mix) as specified in 307 and 407. Use liquid asphalt at the rate of 3% by weight of the total mixture . Asphalt content shall be such that all aggregate is visibl y coated. Submit a mix design to the Engineer for approval as specified in 407.03. Recycled Asphalt Pavement (RAP) meeting the requirements of 307.03.B may be incorporated into asphalt treated permeable base up to 10% by weight of the aggregate. Treated permeable base mixtures containing RAP shall contain at least 65% virgin asphalt binder. For RAP containing gravel as a coarse aggregate, the maximum allowable RAP content shall be 10%. Mix an approved antistrip agent with th e asphalt cement at the dosage as specified in 921.06.B. EQUIPMENT
313.04 Equipment
To construct Portland cement treated base, provide equipment meeting 501.04.A and 501.04.B. To construct bituminous treated base, provide equipment meeting 407.04 through 407.08. 313.05 272 The spreading equipment shall meet either 501.04.D.11 or 407.06. CONSTRUCTION REQUIREMENTS
313.05 Construction Requirements
Construct cement treated permeable base and asphalt treated permeable base as specified in 309 and 307 respectively, unless o therwise specified below.
A.Cement Treated Permeable Base
1.Consolidation and Finishing. Immediately after placing the cement treated permeable base, compact the mixture using a steel wheel roller weighing not less than 6 tons. Continue rolling until maximum densification is achieved; immediately cease rolling if aggregate breakage occurs. Do not use vibratory rollers. Instead of using a steel wheel roller, the Contractor may place the cement treated permeable base with a high -density screed with dual tamping bars.
2.Curing. Immediately after spreading and compacting operations , cover the e ntire surface and exposed edges of the cement treated permeable base with transparent or white polyethylene sheeting as specified in 501.18, or a white pigmented wax base curing compound meeting AASHTO M 148. Use polyethylene sh eeting having a thickness of at least 4 mils and hold the sheeting in place for a minimum of 7 days using a method approved by the Engineer. Before placing the sheeting , thoroughly wet the surface of the cement treated permeable base. Place wax-based cur ing compound at a rate of 0.04 to 0.05 gallons per square yard.
B.Asphalt o r Cement Treated Permeable Base From the time of placement until placement of the following pavement layer, protect the treated permea ble base from severe weather conditions, particularly freezing rain, snow, and icing, and from contamination by dust, dirt, mud, or other fine -grained material. Remove and replace, at no additional cost to the Department, all portion(s) of the treated 313.06 273 permeable base that become contaminated to the extent that drainage is reduced or inhibited. Do not allow traffic on the treated permeable base, except for equipment required to place the following layer of pavement, provided that it enters and exits as near as possible to the paving operation. Repair damage to the treated permeable base caused by the Contractor’s equipment at no additional cost to the Department.
313.06 Limitations
If using asphalt treated permeable base, adhere to the limitations specified in 407.09. Do not place any treated permeable base that cannot be covered by the next course of pavement within the same construction season.
313.07 Surface Requirements
The Department will test the finished surface of the treated permeable base with a 12 -foot straightedge in both transverse and longitudinal directions. The finished surface shall be uniform and shall not vary by more than ½ inch from the lower edge of th e straightedge. If the tested surface varies by more than ½ inch, adjust the surface to a new grade, as established by the Engineer, as follows:
1.Fill the low areas with Portland cement concrete during the concrete paving operation , or
2.Apply emulsifi ed asphalt, RS -2, at a rate not to exceed 0.2 gallons per square yard, as determined by the Engineer , over the specified low areas, and fill the low areas with No. 8 mineral aggregate. Seat the size No. 8 mineral aggregate with a pneumatic tire roller.
313.08 Tolerance in Pavement Thickness
Place treated permeable base to the thickness designated on the Plans. Before beginning any further work, take core samples from the treated permeable base, at locations established by the Engineer, in accordance wi th 501.24 for verification of base thickness. Take core samples at locations determined and witnessed by a Department representative, and document on the appropriate form. The Department will adjust the contract unit price in accordance with 501.26 if the base thickness is determined by the Engineer to be deficient. 313.09 274 COMPENSATION
313.09 Method of Measurement
The Department will measure treated permeable base by the square yards complete in place for t he width and thickness specified.
313.10 Basis of Payment
The Department will pay for accepted quantities at the contract prices as follows: Item Pay Unit Treated Permeable Base Square Yard The Department will adjust payment in accordance with 501.26.B for all base found to be deficient in thickness by more than ¼ inch. The Department will not make additional payment over the contract unit price for base that has an average thickness in excess of that shown on the Plans. The cost of antistrip additive used in Bituminous Plant Mix (Hot Mix) will be included in the price of Treated Permeable Base. If the Department orders any increase or decrease in the cement content of the Cement Treated Base from the approved mix design, the measurement and payment for this change will be computed in accordance with 501.25 and 501.26. The Department will consider the cost of taking cores for verification of pavement thickness to be included in the contract unit price of treated permeable base. The Department will not allow additional compensation for leveling o f the treated permeable base except on ramps that contain 4,500 square yards or less of Portland cement concrete pavement. The Department will measure and pay for additional concrete used on these ramps in accordance with
501.25 and 501.26.
Part 4
275 PART 4 – FLEXIBLE SURFACES SECTION 401 – MINERAL AGGREGATE SURFACE ........................ 276 SECTION 402 – PRIME COAT ................................ ............................... 279 SECTION 403 – TACK COAT ................................ ................................ 284 SECTION 405 – BITUMINOUS SEAL COAT ................................ ....... 288 SECTION 407 – BITUMINOUS PLANT MIX PAVEMENTS (GENERAL) ................................ ................................ ................ 296 SECTION 410 – BITUMINOUS PLANT MIX SURFACE COURSE (COLD MIX) ................................ ................................ ............... 348 SECTION 411 – ASPHALTIC CONCRETE SURFACE (HOT MIX) ... 352 SECTION 414 – EMULSIFIED ASPHALT SLURRY SEAL AND MICRO-SURFACING ................................ ................................ 363 SECTION 415 – COLD PLANING OF BITUMINOUS PLANT MIX PAVEMENTS ................................ ................................ ............. 381 401.01 276 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.
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 279–284 of 1,072.