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| |'''Code:''' R322
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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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| ==Materials==
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| {|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#ffddcc" width="210px" align="right" | | {|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#ffddcc" width="210px" align="right" |
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| |'''Bridge Deck, Sealer''' | | |'''Bridge Deck, Sealer''' |
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| |[http://library.modot.mo.gov/RDT/reports/Ri04051/or07009.pdf Report 2007] | | |[https://spexternal.modot.mo.gov/sites/cm/CORDT/or07009.pdf Report 2007] |
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| |[http://library.modot.mo.gov/RDT/reports/Ri96005/Brief.htm Summary 2000]
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| |'''See also:''' [http://www.modot.gov/services/OR/byDate.htm Innovation Library] | | |'''See also:''' [https://www.modot.org/research-publications Research Publications] |
| |} | | |} |
| *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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| 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.
| | See [[:Category:170 Maintenance Activity Planning Guidelines#R322 Bridge Preventative Maintenance|R322 Bridge Seal Coats Maintenance Planning Guidelines]]. |
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| ==Safety==
| | Index of all [[:Category:170 Maintenance Activity Planning Guidelines#Index of Printable Planning Guides|Maintenance Planning Guidelines]]. |
| 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]] | | [[Category:771 Bridge Preventive Maintenance Guidelines|771.19]] |