Attachment_11_Revised_Section_32_12_16_Asphalt_Concrete_Paving.pdf

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ASPHALT CONCRETE PAVING

SECTION 32 12 16

PART 1 - GENERAL

1.1 DESCRIPTION

A. The work of this Section consists of performing all operations necessary to replace pavement where required by construction of structures, manholes, vaults and pipelines.

B. Related Sections

1. Section 02 05 10 – General Site Construction Requirements

2. Section 31 23 00 – Excavation & Fill

1.2 REFERENCES

A. American Society For Testing And Materials

1. ASTM C 131-96, 'Standard Test Method for Resistance to Degradation of Small-Size

Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine'

2. ASTM D 977-98, 'Standard Specification for Emulsified Asphalt'

3. ASTM D 1075-96, 'Standard Test Method for the Effect of Water on Compressive

Strength of Compacted Bituminous Mixtures'

4. ASTM D 1188-96, ‘Standard Test Method for Bulk Specific Gravity and Density of

Compacted Bituminous Mixtures Using Paraffin-Coated Specimens’

5. ASTM D 1559-89, 'Standard Test Method for Resistance to Plastic Flow of Bituminous

Mixtures Using Marshall Apparatus'

6. ASTM D 2027-97, 'Standard Specification for Cutback Asphalt (Medium-Curing

Type)'

7. ASTM D 2041-95, ‘Standard Test Method for Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures’

8. ASTM D 2397-98, 'Standard Specification for Cationic-Emulsified Asphalt'

9. ASTM D 2726-96a, ‘Standard Test Method for Bulk Specific Gravity and Density of

Compacted Bituminous Mixtures Using Saturated Surface-Dry Specimens’

10. ASTM D 3381-92, 'Standard Specification for Viscosity-Graded Asphalt Cement for

Use in Pavement Construction'

1.3 SUBMITTALS

A. Quality Assurance / Control

1. Mix design of asphalt concrete mixture.

2. Copies of test results from tests conducted to assure compliance to Contract Document requirements.

RFP 140P8319R0001

Attachment No. 11 Revised Section 32 12 16

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PART 2 - PRODUCTS

MATERIAL

A. Subbase - WSDOT 9-03.10 Gravel Base

B. Base – WSDOT 9-03.9(3) Crushed Surface Top Course

1. New Aggregate Base -

a. Road Base type gravel or crushed stone, graded as follows:

Sieve Percent by Weight

Passing Sieve

1 inch 100

3/4 inch 99 – 100

1/2 inch 80 - 100

No. 4 45 – 66

No. 40 8 - 24

No. 200 10 max (non-plastic)

b. Quality Requirements-

1) Los Angeles Wear, 500 rev, 35% max

2) Degradation Factor, 25% min

3) % Fracture = 75% min

4) Sand Equivelent = 40 min

2. Recycled Aggregate Base -

a. Pulverized existing Portland cement or asphalt cement concrete paving mixed uniformly with existing aggregate base.

b. Conform to gradation of A.1.a above

c. Quality Requirements same as A.1.a above

C. Asphalt Cement Primer - Meet requirements of ASTM D 2027, MC 70, plus or minus one grade.

D. Tack Coat - Emulsified asphalt meeting requirements of Grade CSS-1 or Grade CSS-1H, or

Grade STE-1 per WSDOT 5-04.3(5)A.

E. Pavement

1. Asphalt Cement - WSDOT 9-02.1(4)

a. Meet requirements of AASHTO M320, Viscosity grade (Original Asphalt) as follows:

1) PG 64-28

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2. Aggregates -

a. Fine to coarse mineral aggregates with wear less than 30 percent as determined by

ASTM C 131 and mineral filler suitable for pavement meeting following gradation requirements -

Sieve Percent by Weight

Passing Sieve

3/4 inch 100

1/2 inch 95 - 100

3/8 inch 80 – 95

No. 4 54 - 71

No. 8 38 – 54

No. 30 17 - 32

No. 200 3 – 8 (non-plastic)

b. Up to fifteen (15) percent by weight of total aggregates may consist of pulverized, recycled asphalt cement concrete pavement, providing aggregate grading requirements are met.

2.2 MIXES

A. Central plant hot mix.

B. Develop mix design according to WSDOT Standard Specifications for HMA Class ¾ PG 64-28 with ESAL’s of 0.3 million to < 3 million. (WSDOT 5-04, 9-03.8, 9-02)

PART 3 - EXECUTION

3.1 PREPARATION

A. Ensure adjacent pavement has a clean straight saw cut line and that the new surface maintains the existing roadway grades.

B. Sub-Grade

1. Fine grade surface to match existing improvements as required by Contract Documents.

2. Compact sub-grade to at least 90% relative compaction per ASTM O 1557.

3.2 INSTALLATION

A. Site Tolerances

1. Sub-Grade - 1.0 inches . Measure using string line from saw cut line to saw cut line, or grade break.

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2. Base for asphalt patching-

a. Base shall match existing or be 6 inches thick minimum after compaction, except where shown thicker on Drawings.

b. Measure using string line from saw cut line to saw cut line, or grade break.

3. Base for new pavement shall match the thickness on the typical section shown on the plans.

4. Paving

a. Apply asphaltic concrete paving in single lift to match existing pavement thickness or two (2) inches thick minimum after compaction, except where shown thicker on

Drawings. Paving thicker than three (3) inches may be applied in two lifts, the first two (2) inches thick minimum and the second one and one half (1-1/2) inches thick minimum No lift of HMA shall exceed three and one half (3½) inches after compaction.

b. Paving adjacent to cast-in-place concrete site elements shall be between 1/4 inch higher than concrete and flush with concrete.

c. Surface texture of hand work areas shall match texture of machine-laid areas.

B. Base

1. Lift thickness shall be a maximum of 10 inches loose thickness.

2. Compact as specified in Section 31 23 00.

3. Re-compact unprimed base if it receives precipitation before pavement is laid.

4. Remove or repair improperly prepared areas as directed by Contracting Officer.

C. Asphaltic Concrete Paving

1. Tack coat all saw cut and vertical asphaltic concrete and concrete surfaces that will be in contact with paving.

2. HMA shall not be placed on any wet surface or when average surface temperatures are below those specified in the following table:

SURFACE TEMPERATURE LIMITATION

Compacted Thickness (ft) Wearing Course Other Courses

Less than 0.10 55° F 45° F

0.10 to 0.20 45° F 35° F

0.20 plus 35° F 35° F

3. Place at temperatures between two hundred and three hundred-twenty five degrees F (250 -

325°F) with a self-propelled laydown machine.

4. Longitudinal bituminous joints shall be vertical and properly tack coated if cold.

Transverse joints shall always be tack coated.

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5. Compaction -

a. Compact asphaltic concrete paving to at least ninety-one (91) percent of the reference maximum density. Determine percent compaction by dividing density of test cores as determined by either ASTM D 1188 or ASTM D 2726 by laboratory reference density as determined by WSDOT FOP for AASHTO T209.

b. Roll with powered equipment capable of obtaining specified density.

c. Begin breakdown rolling immediately after asphalt is placed when asphalt temperature is at maximum. Complete breakdown rolling before mix temperature drops below two hundred-forty degrees F (240°F) Complete handwork compaction concurrently with breakdown rolling.

d. Complete intermediate rolling as soon as possible after breakdown rolling and before mix temperature drops below one hundred-eighty five degrees F (185°F). Do not roll paving for compaction purposes after asphalt temperature falls below 185 deg F. Do not use vibratory rollers on asphalt after temperature falls below one hundred-eighty five degrees F (185°F)

e. Execute compaction so visibility of joints is minimized. Complete finish rolling to improve asphalt surface as soon as possible after intermediate rolling and while asphalt paving is still warm. Do not use vibration for finish rolling.

6. Surface shall be uniform with no 'birdbaths'. Leave finished surfaces clean and smooth.

Variations from specified grades shall not exceed one-half (1/2) inch.

3.4 FIELD QUALITY CONTROL

A. Site Tests - When tested with ten (10) foot edge, surface of complete work shall not contain irregularities in excess of one-fourth (1/4) inch.

END OF SECTION