404Plant Mix Wearing Course

Plant Mix Wearing Course

404.1DESCRIPTION

1 This section describes the requirements for the construction of a plant mix wearing course on a prepared surface.

404.2MATERIALS

1 Provide materials in accordance with the following:

Material Subsection Aggregate for Wearing Course 803 Asphalt Binder 804.1 Emulsified Asphalt 804.3 Hydrated Lime 820 Water 814

2 Provide asphalt binder as specified and in accordance with Subsections 401.2.1, Performance Graded Asphalt Binder, and Subsection 401.4.6.2, Performance Graded Asphalt Binder.

3 Use Emulsions SS-1, CSS-1, SS-1h, or CSS-1h.

404.3EQUIPMENT

404.3.1 Seal Coat

1 Provide an asphalt distributor for heating and applying emulsified asphalt that meets the requirements of Subsection 407.3, Equipment. Provide power-operated rotary brooms for cleaning the roadway.

404.3.2 Plant Mix Wearing Course

1 Provide equipment in accordance with Subsection 401.3, Equipment.

404.4CONSTRUCTION

404.4.1 General

1 Follow the construction requirements in Section 401, Plant Mix Pavements and Recycled Plant Mix Pavements, except as modified.

Plant Mix Wearing Course SECTION 404

2 Place plant mix wearing course between June 1 and September 15. The engineer may give written approval to extend these dates. Schedule a prepaving conference before placement to discuss materials, equipment, and procedures.

3 Prior to placement of plant mix wearing course, ensure all existing pavement markings are completely removed by grinding or water blasting, and the roadway is clean and dust- free.

404.4.2 Quality Requirements

1 Construct wearing course using quality control and quality acceptance procedures in accordance with the following subsections, as applicable based on testing requirements in Table 404.4.2-1, Testing Requirements.

Laboratory and Personnel Correlation 114 Resolution 114 Quality Control Testing 401.4.6 Quality Acceptance Testing 401.4.7 Verification 401.4.8 Independent Assurance401.4.9 401.4.9 Documentation and Reporting 401.4.10.1(1) except that no testing or results are required for items 1.2, 1.4, and 401.4.10.2 Corrective Action Plan 401.4.11

2 The department does not require recorrelation before placement if correlation testing for aggregate tests has already been performed with placement of plant mix pavement and the contractor’s and department’s personnel and equipment have remained unchanged.

3 Perform quality acceptance testing in accordance with T able 404.4.2-1, T esting Requirements.

404.4.2.1 Testing Requirements

1 Before placement, test a split aggregate sample in accordance with Subsection 114.3.3.2, Aggregate Gradation.

2 Test for quality control, quality acceptance, and verification in accordance with Table 404.4.2-1, Testing Requirements.

Plant Mix Wearing Course SECTION 404

Table 404.4.2-1 Testing Requirements Test Procedure Test Frequency(1) Quality Control–Virgin Aggregate Production Gradation; Liquid Limit (LL); Plasticity Index (PI); Coarse Aggregate Angularity (Fractured Faces); Fine Aggregate Angularity; Flat & Elongated (2) 1/1000 ton [1/1000 t] minimum LA Abrasion (Contractor-Furnished Sources only) 1/10,000 ton [1/10 000 t] minimum Soundness (MgS04)(3)(4) (Contractor-Furnished Source only) 1/20,000 ton [1/20 000 t] minimum Sand Equivalent (3) (Contractor-Furnished Source only) 1/5000 ton [1/5000 t] minimum Quality Acceptance–Mix Production(5) Virgin Aggregate Gradation 1 lot/5000 ton [1 lot/5000 t] Asphalt Binder Content 1/day Virgin Aggregate-LL; PI; Coarse Aggregate Angularity (Fractured Faces); Fine Aggregate Angularity, Flat & Elongated (6) 1/1000 ton [1/1000 t] minimum Moisture Content of Virgin Aggregate/Hydrated Lime 1/1000 ton [1/1000 t] minimum Moisture Content of Mix 1/day Verification–Mix Production Virgin Aggregate Gradation 1/lot Asphalt Binder Content No tests required Virgin Aggregate-LL; PI; Coarse Aggregate Angularity (Fractured Faces); Moisture Content of Virgin Aggregate/Hydrated Lime; Moisture Content of Mix; Flat & Elongated No tests required Aggregate/Hydrated Lime; Moisture Content of Mix; Flat & Elongated

and elongated are within specification, and there are no changes in the crushing process, test at a frequency of 1/10,000 ton [1/10 000 t].

pavement.

soundness will apply to the coarse aggregate only.

specification.

Plant Mix Wearing Course SECTION 404

404.4.3 Job Mix Formula (JMF)

1 At least 14 calendar days before starting the placement of plant mix wearing course, submit a JMF with samples of produced material for each aggregate fraction to the engineer for approval. Ensure that the JMF and allowable tolerances are within the broadband specified in Subsection 803.6, Aggregate for Plant Mix Wearing Course. Use the JMF to establish a single percentage of aggregate passing each required sieve size and a single mixing temperature. The Materials Program will specify the percentage of asphalt binder to be added. Furnish mix with aggregate fractions within the wide band limits and the tolerance ranges above and below the tar get job mix formula as shown in Table 404.4.3-1, Aggregate Tolerances.

Table 404.4.3-1 Aggregate Tolerances Sieve Size Range Passing No. 4 [4.75 mm] sieve - 5 % to + 5 % Passing No. 8 [2.36 mm] sieve - 5 % to + 5 % Passing No. 200 [75 µm] sieve - 2.0 % to + 2.0 % Mixing Temperature ± 20 F degrees [± 7 C degrees]

2 Do not change the JMF without the engineer’s written approval.

404.4.4 Mix Design

1 The Materials Program will perform laboratory testing to establish the optimum asphalt content for the wearing course based on the contractor’s JMF.

404.4.5 Seal Coat

1 Place seal coat when the application surface is dry and the air and pavement surface temperature are at least 50 ºF [10 ºC].

2 Submit emulsified asphalt samples and certification documents in accordance with Subsection 407.4.2, Sampling Procedures.

3 The application rate specified for emulsified asphalt is for specification material before additional dilution for field application. Emulsified asphalt used for seal coat may be diluted in the field at a ratio of 1 part emulsified asphalt to 1 part water (1:1). Before mixing, heat the dilution water and the emulsion to at least 110 ºF [45 ºC]; dilute by introducing the water into the emulsified asphalt.

4 Apply the seal coat so that there is uniform, complete coverage, and within the temperature range specified in Table 407.4.3-1, Emulsion Application Temperatures for Tack Coat.

5 Do not apply more seal coat to the surface area than can be covered by that day’s production of plant mix wearing course.

Plant Mix Wearing Course SECTION 404

404.4.6 Compaction

1 Compact the plant mix wearing course with three passes of a steel wheel roller in static mode. The department defines one pass with a roller as a forward or backward movement over the full length of the area to be compacted.

404.4.7 Surface Variation

1 Test the surface using a 10-foot [3 m] straightedge at selected locations. Do not allow variation of the surface from the straightedge between any two contacts with the surface greater than 3/16 in [5 mm]. Remove defective work with approved milling equipment and replace with new material. Provide a milled surface where the difference in height between adjacent peaks and valleys of the milled surface does not exceed ⅛ in [3 mm]. Approval of the milling equipment will be based upon the contractor successfully demonstrating on a representative surface that the milling equipment is capable of producing the required milled surface.

404.4.8 Acceptance

1 The engineer may isolate and reject obviously defective material without regard to testing procedures; otherwise, the engineer will accept or reject materials as follows:

Materials.

Binder, and Subsection 113.2, Acceptance of Asphalt Materials.

Aggregate.

Binder Content.

test and the quantity of water added.

6.1Liquid Limit and Plastic Index;

6.2Moisture Content of Plant Mix; and

6.3Coarse and Fine Aggregate Angularity.

Plant Mix Wearing Course SECTION 404

404.5MEASUREMENT and PAYMENT

404.5.1 General

1 The engineer will measure:

of the aggregate, performance graded asphalt binder , and hydrated lime. The cumulative weight [mass] of batches of plant mix wearing course incorporated in the work will be used for payment.

with Subsection 109.1.3, Measurement Methods. Quantities of water to dilute the emulsified asphalt for application will not be measured and paid for as Emulsified Asphalt.

2 The department will pay as follows:

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest

Plant Mix Wearing Course TON [t] 0.05 ton [0.05 t] 0.05 TON [0.05 t] Seal Coat TON [t] 0.01 ton [0.01 t] 0.01 TON [0.01 t]

404.5.2 Referenced Sections for Direct Payment

1 When specified, the engineer will measure and pay for:

Recycled Plant Mix Pavements.

perform the sampling and quality control and quality acceptance testing requirements.

404.5.3 Determination of Pay Factors

1 The engineer will determine pay factors as follows:

Binder.

Plant Mix Wearing Course SECTION 404

Acceptance of Aggregate.

Binder Content

404.5.4 Price Adjustment

404.5.4.1 Emulsified Asphalt

1 If the samples for a truckload are not received by the Materials Program with proper documentation within seven calendar days of sampling, in accordance with Subsection 407.4.2, Sampling Procedures, the engineer will reduce the payment by as much as 25 percent for that load.

2 The engineer may reduce the payment for emulsified asphalt that does not meet specifications but is accepted in accordance with Subsection 113.2, Acceptance of Asphalt Materials.

404.5.4.2 Plant Mix Wearing Course

1 The engineer will calculate pay adjustments for aggregate gradation and asphalt binder content using the following formulas:

Aggregate Gradation: PA A = 0.67 x PMWC x (PFA – 1) x LSA

Asphalt Binder Content: PA AC = 0.67 x PMWC x (PFAC – 1) x LSAC

Where: PAA = Pay Adjustment for Aggregate Gradation (dollars) PMWC = Plant Mix Wearing Course Contract Unit Price (dollars) PFA = Aggregate Gradation Pay Factor for evaluated lot LSA = Lot Size for Aggregate Gradation evaluated for (short ton [metric ton]) PAAC = Pay Adjustment for Asphalt Binder Content (dollars) PFAC = Asphalt Binder Pay Factor for evaluated lot LSAC = Lot Size for Asphalt Binder Content evaluated lot (short ton [metric ton])