Section_32_12_13_Prime_Coat_Tack_Coat.docx
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SECTION 32 12 13 PRIME COAT/TACK COAT
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SECTION 32 12 13
SECTION 32 12 13
PRIME COAT/TACK COAT
PART 1 GENERAL
| 1.1 | SECTION INCLUDES |
| A. | Materials and procedures for applying: |
| 1. | Prime coat: Liquid or emulsified asphalt to a prepared subgrade or untreated base course. |
| 2. | Tack coat: Cutback or emulsified asphalt to the existing surface or new pavement surface and intermediate lifts. |
| B. | Blotter materials and procedures for absorbing excess asphalt as required. |
| 1.2 | REFERENCES |
| A. | AASHTO T 27: Sieve Analysis of Fine and Coarse Aggregates |
| B. | AASHTO T 201: Kinematic Viscosity of Asphalts |
| 1.3 | SUBMITTALS |
| A. | Certificate showing asphaltic material complies with Section 32 12 03. |
PART 2 PRODUCTS
| 2.1 | PRIME COAT |
| A. | MC-70 or MC-250, meeting the requirements of Section 32 12 03. |
| B. | Blotter material: Granular materials following AASHTO T 27, meeting the following criteria: |
Table 1 Granular Materials
| Sieve Size |
| Percent Passing |
No. 4 No. 10 No. 200 90 to 100 25 to 80 0 to 15
| 2.2 | TACK COAT |
| A. | CSS-1h emulsified asphalt meeting the requirements of Section 32 12 03. |
| 1. | Diluted 2:1 – two parts concentrate to one part water by the manufacturer. |
| a) | Dilute at terminal only. |
| b) | Do not change dilution without obtaining prior written approval from the Engineer. |
| B. | Tack coat referred to for paving fabrics is a PG 58-22 or PG 64-22. |
| C. | Do not use an emulsion or cutback in paving fabric placement. |
PART 3 EXECUTION
| 3.1 | SURFACE PREPARATION | |
| A. | Prime Coat: | |
| 1. | A prime coat is an application required on aggregate base courses to receive new HMA pavement less than 4 inches thick. | |
| 1. | Shape the surface to the required grade and section. | |
| 2. | Keep the surface free from ruts, corrugations, or other irregularities. | |
| 3. | Compact the surface following Section 02056. | |
| B. | Tack Coat: | |
| 1. | Clean the surface of all materials that prevent the tack coat from bonding to the existing surface such as mud, dirt, leaves, etc. | |
| 2. | Cover all tacked surface areas with surfacing materials the same day the tack coat is applied. |
| 3.2 | APPLICATION | |
| A. | Apply at the following rates: | |
| 1. | Prime Coat: | 0.5 gal/yd2 |
| 2. | Tack Coat: | 0.15 gal/yd2 |
| 3. | The above application rates may vary according to field conditions. Obtain approval for the quantities, rate of application, temperatures, and areas to be treated before any application. | |
| B. | Do not apply prime coat or tack coat: | |
| 1. | On a wet surface. | |
| 2. | When the surface temperature is below 50 degrees F. | |
| 3. | When weather conditions prevent it from adhering properly. | |
| C. | Protect all structures including guardrails, guide posts, etc. from being spattered or marred. | |
| D. | Use a pressure distributor to apply the asphalt in a uniform, continuous spread. | |
| E. | Keep the viscosity between 50 and 100 centistokes. AASHTO T 201. | |
| F. | Immediately apply another application to under primed surface. | |
| G. | Apply a prime or tack coat to all surfaces, including vertical that will come in contact with Hot Mix Asphalt. | |
| H. | Spread blotter material if the prime coat fails to penetrate. Use the quantities required to absorb the excess asphalt. |
| 3.3 | TRAFFIC CONTROL |
| A. | Refer to Section 01 55 26. |
| B. | Maintain the prime coat/tack coat until the next course is placed. |
| C. | Keep all traffic off the prime coat until it has cured and dried. |
END OF SECTION
PRIME COAT/TACK COAT Page 1
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