Difference between revisions of "771.19 Chip Seal to Entire Deck"

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|'''Code:''' R322
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|'''Bridge Deck, Sealer'''
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|[https://spexternal.modot.mo.gov/sites/cm/CORDT/or07009.pdf Report 2007]
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|'''See also:''' [https://www.modot.org/research-publications Research Publications]
 
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Chip seals help to seal bridge decks with excessive cracking to prevent intrusion of water and chlorides into the bridge deck. The work should be performed in July and August.
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See [[:Category:170 Maintenance Activity Planning Guidelines#R322 Bridge Preventative Maintenance|R322 Bridge Seal Coats Maintenance Planning Guidelines]].
  
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==Materials==
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Index of all [[:Category:170 Maintenance Activity Planning Guidelines#Index of Printable Planning Guides|Maintenance Planning Guidelines]].
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*Liquid asphalt – EA 90P or CRS-2P
 
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*Cover aggregate – Iron Mountain trap rock, Joplin chat, or other approved materials
 
  
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==Procedures==
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[[Category:771 Bridge Preventive Maintenance Guidelines|771.19]]
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1. Deck should be thoroughly sounded out and deck repairs made.
 
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2. Deck should be cleaned, flushed, and dry prior to sealing.
 
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3. Cover expansion devices or other features that are not to be sealed over.
 
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4. Chip seals are to extend a minimum of 30 ft. beyond each bridge end.
 
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5. Apply liquid asphalt at a rate of 0.3 to 0.5 gal./yd<sup>2</sup> depending on size of cover aggregate and slope of bridge deck.
 
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6. Spread 25 to 30 lbs. of cover aggregate per yd<sup>2</sup> immediately following application of liquid asphalt and roll as soon as possible. Adequate cover aggregate must be applied to prevent tracking. Cover aggregate shall not be placed within 2 ft. of curb.
 
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7. Lightly broom excess chips after seal is properly cured (when chips are securely held), then open lane to traffic.
 
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8. Repeat for adjacent lanes.
 
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9. Return two to three days later to again thoroughly sweep bridge deck to remove loose aggregate. Remove aggregate on lower chords and substructure caps.
 
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==Safety==
 
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Watch for flying rock chips and traffic in adjacent lanes. Consider the need to install Loose Gravel signs until the loose aggregate is removed from the bridge deck.
 
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[[Category:771 Bridge Preventative Maintenance Guidelines|771.15]]
 

Latest revision as of 13:54, 18 August 2020

Bridge Deck, Sealer
Report 2007
See also: Research Publications

See R322 Bridge Seal Coats Maintenance Planning Guidelines.

Index of all Maintenance Planning Guidelines.

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