Difference between revisions of "505 - Chip Seals"

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==GENERAL==
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==[[#GENERAL|GENERAL]]==
  
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<span style="color: red"> -Reserved- </span>
  
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===Pre-Paving Meeting===
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{{top}}
  
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A pre-paving conference between the Contractor and the Engineer should be held on site prior to beginning work.
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==[[#MATERIALS|MATERIALS]]==
  
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{| class="wikitable"
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<span style="color: red"> -Reserved- </span>
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! colspan="2" |
 
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<center>'''Items to be Discussed at the Pre-Paving Conference'''</center>
 
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<center>1</center>
 
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The detailed work schedule.
 
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<center>2</center>
 
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The traffic control plan.
 
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<center>3</center>
 
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Equipment calibration and adjustments.
 
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<center>4</center>
 
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Overall safety plan.
 
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<center>5</center>
 
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Any special items within the contract.
 
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<center>6</center>
 
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Exchange list of key personnel assigned to the project.
 
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{{top}}
  
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==MATERIALS==
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==[[#CONSTRUCTION|CONSTRUCTION]]==
  
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The asphalt emulsion must be a certified product and be supplied by a certified supplier.  The Contractor must maintain quality control and uniformity in testing procedures.  The Contractor must submit to the Engineer a daily report showing the test results, as well as other information addressed in subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/506%20Slurry%20Seal.pdf 506.02.A.1.c] of the Standard Specifications for Construction.
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===[[#Double Chip Seal Seasonal Limitation|Double Chip Seal Seasonal Limitation]]===
  
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a. From June 1 to August 1 in the Upper Peninsula
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b. From May 15 to August 15 in the Lower Peninsula north of M-46
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c. From May 15 to August 31 in the Lower Peninsula south of M-46
  
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==CONSTRUCTION==
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{{top}}
  
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The surface shall have all dirt, debris and vegetation removed.  The asphalt emulsion shall not be placed until the surface is approved by the Engineer.
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===[[#Longitudinal Construction Joints |Longitudinal Construction Joints ]]===
  
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The asphalt emulsion shall be uniformly applied at an application temperature between 145°F (63°C) and 190°F (88°C).  At no time during the operation shall the asphalt emulsion distributor be more than 150 feet (45 m) ahead of the chip spreader.
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Longitudinal Construction Joints in Double Chip Seal – Concern has been raised that the double chip seals are filling in centerline corrugations too much.  As a result the special provision 12SP505(B) Warranty Work Requirements for Double Chip Seals contains language specifying that the base course of the chip seal will go up to the corrugations but not cover them. The top course will be the only one that will cover the corrugations.  
  
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Immediately following the application of the asphalt emulsion, the chips shall be uniformly spread over the surface at the specified rate.
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{{top}}
  
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The rolling shall be done before the asphalt emulsion has cured.  At no time shall there be more than 150 feet (45 m) of unrolled cover material.  No cover material shall be left unrolled for more than 5 minutes.
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===[[#Fog Seals|Fog Seals]]===
  
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Brooming shall be performed within 24 hours of application.  Brooming may begin within 6 hours of the application.
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====[[#Chip Seals with Fog Seal - Delay times|Chip Seals with Fog Seal - Delay times]]====
  
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Placement is not permitted if there is rain, or threatening weather, and temperatures are forecast to be below 32°F (0°C) within 24 hours of completion of work.  The chip seal will not be applied if the air or pavement surface temperature is below 55°F (13°C).
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As per spec, complete application of the fog seal within 48 hours of the application of chip seal, but not on the same day as the application of chip seal.
  
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Because the fog seal prevents stone loss and also the temporary raised markings have taken a beating (especially on a double chip seal) the first application of pavement markings after a fog seal may be placed the next day. 
  
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===Equipment===
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{{top}}
  
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Equipment shall be safe, environmentally acceptable and capable of producing a product that meets the specifications.
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==[[#MEASUREMENT AND PAYMENT|MEASUREMENT AND PAYMENT]]==
  
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The pressure distributor shall meet the same requirements as discussed in [[502 - HMA Construction Practices|Section 502]] of this manual.
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<span style="color: red"> -Reserved- </span>
  
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{{top}}
  
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====Chip Spreader====
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[[Category:Construction Manual]]
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[[Category:Division 5]]
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The chip spreader shall be self-propelled, equipped with pneumatic tires and a screen to remove oversize material.  It shall be capable of uniformly spreading the cover material at the designated rate.
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[[Category:Section 505]]
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====Roller====
 
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A self-propelled, pneumatic tired roller weighing more than 8 tons shall be used.
 
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====Miscellaneous Equipment====
 
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A power broom and all necessary hand tools, thermometers, etc. shall be provided.
 
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==MEASUREMENT AND PAYMENT==
 
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===Delayed Acceptance===
 
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This type of project has a 30 day delayed acceptance procedure.  Any major problems with the project will have to be corrected before the project will be accepted.  The inspector must observe the operation to ensure that the Contractor is following all safety rules and has proper traffic control.  The surfacing operation is the responsibility of the Contractor.  However, if the inspector observes a nonuniform surface, safety violations or traffic control violations, the Contractor must be notified immediately.  If the Contractor does not correct these violations, the project should be stopped.
 
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It is very important that sufficient rolling be done to embed the cover material into the HMA emulsion and that any loose material be broomed off before allowing traffic onto the new surface.
 

Revision as of 16:31, 6 May 2021

505
Chip seal
2012 STANDARD SPECIFICATIONS FOR CONSTRUCTION - SECTION 505


GENERAL

-Reserved-

[top of page]

MATERIALS

-Reserved-

[top of page]

CONSTRUCTION

Double Chip Seal Seasonal Limitation

a. From June 1 to August 1 in the Upper Peninsula b. From May 15 to August 15 in the Lower Peninsula north of M-46 c. From May 15 to August 31 in the Lower Peninsula south of M-46

[top of page]

Longitudinal Construction Joints

Longitudinal Construction Joints in Double Chip Seal – Concern has been raised that the double chip seals are filling in centerline corrugations too much. As a result the special provision 12SP505(B) Warranty Work Requirements for Double Chip Seals contains language specifying that the base course of the chip seal will go up to the corrugations but not cover them. The top course will be the only one that will cover the corrugations.

[top of page]

Fog Seals

Chip Seals with Fog Seal - Delay times

As per spec, complete application of the fog seal within 48 hours of the application of chip seal, but not on the same day as the application of chip seal.

Because the fog seal prevents stone loss and also the temporary raised markings have taken a beating (especially on a double chip seal) the first application of pavement markings after a fog seal may be placed the next day.

[top of page]

MEASUREMENT AND PAYMENT

-Reserved-

[top of page]

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