770.7 Maintenance of Bridge Superstructure - Revision history

Hoskir: /* 770.7.3 Seal Coat Resurfacing */

2025-02-03T14:11:12Z

770.7.3 Seal Coat Resurfacing

← Older revision		Revision as of 09:11, 3 February 2025
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	If the condition of the deck is such that deterioration is not advanced and the deck is not uneven, an asphaltic seal coat or double seal coat may be applied. See [[771.2 Bridge Cleaning and Flushing\|Chip Sealing Deck]] for additional information. Bridge deck seal coats should be performed during the summer months and be completed by September 1.		If the condition of the deck is such that deterioration is not advanced and the deck is not uneven, an asphaltic seal coat or double seal coat may be applied. See [[771.2 Bridge Cleaning and Flushing\|Chip Sealing Deck]] for additional information. Bridge deck seal coats should be performed during the summer months and be completed by September 1.

	The deck should be repaired prior to sealing in accordance with the procedures for [[concrete repairs]].		The deck should be repaired prior to sealing in accordance with the procedures for concrete repairs.

	The entire deck should be cleaned by sweeping or by [[771.2 Bridge Cleaning and Flushing\|cleaning and flushing]] thoroughly and allowed to dry completely prior to sealing.		The entire deck should be cleaned by sweeping or by [[771.2 Bridge Cleaning and Flushing\|cleaning and flushing]] thoroughly and allowed to dry completely prior to sealing.

Smithk: Updated website link for increased security

2021-10-26T16:20:44Z

Updated website link for increased security

← Older revision		Revision as of 11:20, 26 October 2021
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	==770.7.2 Concrete Deck Maintenance==		==770.7.2 Concrete Deck Maintenance==
	Concrete deck repairs range from crack sealing to full depth repairs. Emergency partial depth repairs may temporarily be made with bituminous materials. Permanent repairs should be scheduled as soon as possible. Full depth failure should be repaired immediately. In an extreme emergency, where traffic or weather condition make it impossible to do this, the short term use of steel plates is acceptable. For steel plate and back filled work, review [[616.6 Temporary Traffic Control Zone Devices (MUTCD 6F)#616.6.46 STEEL PLATE AHEAD Sign (WO8-24) (MUTCD 6F.46)\|EPG 616.6.46 Steel Plate Ahead Signs]] and [~~http~~://epg.modot.org/index.php?title=616.8_Typical_Applications_%28MUTCD_6H%29#Listing_of_Typical_Applications_for_Maintenance Typical Applications 616.8.47a and 616.8.47b].		Concrete deck repairs range from crack sealing to full depth repairs. Emergency partial depth repairs may temporarily be made with bituminous materials. Permanent repairs should be scheduled as soon as possible. Full depth failure should be repaired immediately. In an extreme emergency, where traffic or weather condition make it impossible to do this, the short term use of steel plates is acceptable. For steel plate and back filled work, review [[616.6 Temporary Traffic Control Zone Devices (MUTCD 6F)#616.6.46 STEEL PLATE AHEAD Sign (WO8-24) (MUTCD 6F.46)\|EPG 616.6.46 Steel Plate Ahead Signs]] and [https://epg.modot.org/index.php?title=616.8_Typical_Applications_%28MUTCD_6H%29#Listing_of_Typical_Applications_for_Maintenance Typical Applications 616.8.47a and 616.8.47b].

	Failures less than 1 in. deep are called spalls. Failures over 1 in. deep but that do not go through the deck are classed as partial depth.		Failures less than 1 in. deep are called spalls. Failures over 1 in. deep but that do not go through the deck are classed as partial depth.

Smithk at 20:14, 18 August 2020

2020-08-18T20:14:11Z

← Older revision		Revision as of 15:14, 18 August 2020
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	\|[http://library.modot.mo.gov/RDT/reports/Ri98021/RDT02003.pdf Report 2002]		\|[http://library.modot.mo.gov/RDT/reports/Ri98021/RDT02003.pdf Report 2002]
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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]
	\|}		\|}
	==770.7.1 General Bridge Deck Maintenance==		==770.7.1 General Bridge Deck Maintenance==

Smithk: /* 770.7.2 Concrete Deck Maintenance */ updated link

2016-07-22T13:14:57Z

770.7.2 Concrete Deck Maintenance: updated link

← Older revision		Revision as of 08:14, 22 July 2016
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	==770.7.2 Concrete Deck Maintenance==		==770.7.2 Concrete Deck Maintenance==
	Concrete deck repairs range from crack sealing to full depth repairs. Emergency partial depth repairs may temporarily be made with bituminous materials. Permanent repairs should be scheduled as soon as possible. Full depth failure should be repaired immediately. In an extreme emergency, where traffic or weather condition make it impossible to do this, the short term use of steel plates is acceptable. For steel plate and back filled work, review [[616.6 Temporary Traffic Control Zone Devices (MUTCD 6F)#616.6.46 STEEL PLATE AHEAD Sign (WO8-24) (MUTCD 6F.46)\|EPG 616.6.46 Steel Plate Ahead Signs]] and [[616.~~23 Traffic Control for Field Operations~~#~~TA-47a Excavations with Steel Plate or Backfill - Undivided Highway\|~~Typical Applications 616.8.47a]] and ~~[[616.23 Traffic Control for Field Operations#TA-47a Excavations with Steel Plate or Backfill - Divided Highway\|~~616.8.47b]].		Concrete deck repairs range from crack sealing to full depth repairs. Emergency partial depth repairs may temporarily be made with bituminous materials. Permanent repairs should be scheduled as soon as possible. Full depth failure should be repaired immediately. In an extreme emergency, where traffic or weather condition make it impossible to do this, the short term use of steel plates is acceptable. For steel plate and back filled work, review [[616.6 Temporary Traffic Control Zone Devices (MUTCD 6F)#616.6.46 STEEL PLATE AHEAD Sign (WO8-24) (MUTCD 6F.46)\|EPG 616.6.46 Steel Plate Ahead Signs]] and [http://epg.modot.org/index.php?title=616.8_Typical_Applications_%28MUTCD_6H%29#Listing_of_Typical_Applications_for_Maintenance Typical Applications 616.8.47a and 616.8.47b].

	Failures less than 1 in. deep are called spalls. Failures over 1 in. deep but that do not go through the deck are classed as partial depth.		Failures less than 1 in. deep are called spalls. Failures over 1 in. deep but that do not go through the deck are classed as partial depth.

Smithk: /* 770.7.4 Bituminous Mat Resurfacing */ Per Bridge, revision to match guidance with current bridge asphalt overlay seal coat policy.

2014-06-06T16:05:16Z

770.7.4 Bituminous Mat Resurfacing: Per Bridge, revision to match guidance with current bridge asphalt overlay seal coat policy.

← Older revision		Revision as of 11:05, 6 June 2014
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	The deck shall be coated with a seal coat or double seal coat application as described under [[#770.7.3 Seal Coat Resurfacing\|Seal Coat Resurfacing]] prior to asphaltic mat application. The seal chips should extend to the curblines for asphaltic mat overlays.		The deck shall be coated with a seal coat or double seal coat application as described under [[#770.7.3 Seal Coat Resurfacing\|Seal Coat Resurfacing]] prior to asphaltic mat application. The seal chips should extend to the curblines for asphaltic mat overlays.

	Type A asphaltic concrete is preferred for use on bridges on heavy traffic routes. It is preferred for use on all bridges, but a Type C mix may be used for bridges on medium or low traffic routes. The maximum aggregate size should be 1/2 in. The mat material should not be too rich or this will cause the mat to shove under traffic.		Type A asphaltic concrete is preferred for use on bridges on heavy traffic routes. It is preferred for use on all bridges, but a Type B mix may be used for bridges on medium or low traffic routes. The maximum aggregate size should be 1/2 in. The mat material should not be too rich or this will cause the mat to shove under traffic.

	The asphaltic concrete shall be placed with asphalt pavers. Other mixes may be placed with pavers or motorgraders; however, asphalt pavers are preferred. The mat shall be rolled as soon as possible with special attention being given to the area along the curbs and around the curb outlets as traffic will not assist in rolling this area. Curb outlets shall be cleaned of mat after rolling and before the asphalt has set. It is extremely important to obtain a smooth riding surface and one which will drain properly.		The asphaltic concrete shall be placed with asphalt pavers. Other mixes may be placed with pavers or motorgraders; however, asphalt pavers are preferred. The mat shall be rolled as soon as possible with special attention being given to the area along the curbs and around the curb outlets as traffic will not assist in rolling this area. Curb outlets shall be cleaned of mat after rolling and before the asphalt has set. It is extremely important to obtain a smooth riding surface and one which will drain properly.

Smithk at 14:45, 7 August 2013

2013-08-07T14:45:21Z

← Older revision		Revision as of 09:45, 7 August 2013
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	\|<center>'''Ground-Penetrating Radar'''</center>		\|<center>'''Ground Penetrating Radar'''</center>
	\|-		\|-
	\|[[image:770.7.1.jpg\|right\|210px]]Travelers may see a van similar to this one driving on and around bridges. It belongs to a company called [http://penetradar.com/ Penetradar]. They use ground-penetrating radar to evaluate pavement, as in this image from their website. It also efficiently analyzes bridge decks similar to a giant CAT scan or MRI. Information gathered helps to identify problems within the bridge before a single cut is made in the pavement. This helps the repair contractor know what is to be faced before opening the surface. Fewer surprises make for less stressful, more profitable work. It also helps MoDOT. Fewer surprises make for fewer last-minute (often expensive) fixes and keep work zone time to a minimum. Perhaps most of all, it helps motorists. When contractors know what they will face, they can work and get out of drivers' way more quickly.		\|[[image:770.7.1.jpg\|right\|210px]]Travelers may see a van similar to this one driving on and around bridges. It belongs to a company called [http://penetradar.com/ Penetradar]. They use ground penetrating radar to evaluate pavement, as in this image from their website. It also efficiently analyzes bridge decks similar to a giant CAT scan or MRI. Information gathered helps to identify problems within the bridge before a single cut is made in the pavement. This helps the repair contractor know what is to be faced before opening the surface. Fewer surprises make for less stressful, more profitable work. It also helps MoDOT. Fewer surprises make for fewer last-minute (often expensive) fixes and keep work zone time to a minimum. Perhaps most of all, it helps motorists. When contractors know what they will face, they can work and get out of drivers' way more quickly.
	\|}		\|}

Smithk: ground-penetrating radar genral info added

2013-08-07T14:16:53Z

ground-penetrating radar genral info added

← Older revision		Revision as of 09:16, 7 August 2013
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	2. Surface and crack sealers, chip seals and other wearing surfaces to minimize deck wear and assist in preventing further deterioration or possible damage from ice control chemicals.		2. Surface and crack sealers, chip seals and other wearing surfaces to minimize deck wear and assist in preventing further deterioration or possible damage from ice control chemicals.
			{\|style="padding: 0.3em; margin-left:9px; border:2px solid #a9a9a9; text-align:left; font-size: 95%; background:#f5f5f5" width="370px" align="right"
			\|-
			\|<center>'''Ground-Penetrating Radar'''</center>
			\|-
			\|[[image:770.7.1.jpg\|right\|210px]]Travelers may see a van similar to this one driving on and around bridges. It belongs to a company called [http://penetradar.com/ Penetradar]. They use ground-penetrating radar to evaluate pavement, as in this image from their website. It also efficiently analyzes bridge decks similar to a giant CAT scan or MRI. Information gathered helps to identify problems within the bridge before a single cut is made in the pavement. This helps the repair contractor know what is to be faced before opening the surface. Fewer surprises make for less stressful, more profitable work. It also helps MoDOT. Fewer surprises make for fewer last-minute (often expensive) fixes and keep work zone time to a minimum. Perhaps most of all, it helps motorists. When contractors know what they will face, they can work and get out of drivers' way more quickly.
			\|}

	3. Bituminous mat overlays are used to level uneven decks. This work may be performed by district routine maintenance crews or by contract. Since the overlay is adding dead load to the structure, the bridge must be evaluated and approved for the overlay by the Bridge Division. Repairs to these mats must be made with materials similar to the original material, that is, asphaltic concrete mix must be used to patch or repair asphaltic concrete mats except for temporary repairs in an emergency. A seal coat or double seal coat to waterproof the deck should be placed before placing a mat overlay.		3. Bituminous mat overlays are used to level uneven decks. This work may be performed by district routine maintenance crews or by contract. Since the overlay is adding dead load to the structure, the bridge must be evaluated and approved for the overlay by the Bridge Division. Repairs to these mats must be made with materials similar to the original material, that is, asphaltic concrete mix must be used to patch or repair asphaltic concrete mats except for temporary repairs in an emergency. A seal coat or double seal coat to waterproof the deck should be placed before placing a mat overlay.

Smithk: /* 770.7.2 Concrete Deck Maintenance */ Per Traffic, guidance on use and installation of steel plates on high-speed roadways

2012-10-10T17:10:46Z

770.7.2 Concrete Deck Maintenance: Per Traffic, guidance on use and installation of steel plates on high-speed roadways

← Older revision		Revision as of 12:10, 10 October 2012
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	==770.7.2 Concrete Deck Maintenance==		==770.7.2 Concrete Deck Maintenance==
	Concrete deck repairs range from crack sealing to full depth repairs. Emergency partial depth repairs may temporarily be made with bituminous materials. Permanent repairs should be scheduled as soon as possible. Full depth failure should be repaired immediately. In an extreme emergency, where traffic or weather condition make it impossible to do this, the short term use of steel plates is acceptable. ~~They must be anchored securely to the deck~~ and ~~appropriate signing erected~~.		Concrete deck repairs range from crack sealing to full depth repairs. Emergency partial depth repairs may temporarily be made with bituminous materials. Permanent repairs should be scheduled as soon as possible. Full depth failure should be repaired immediately. In an extreme emergency, where traffic or weather condition make it impossible to do this, the short term use of steel plates is acceptable. For steel plate and back filled work, review [[616.6 Temporary Traffic Control Zone Devices (MUTCD 6F)#616.6.46 STEEL PLATE AHEAD Sign (WO8-24) (MUTCD 6F.46)\|EPG 616.6.46 Steel Plate Ahead Signs]] and [[616.23 Traffic Control for Field Operations#TA-47a Excavations with Steel Plate or Backfill - Undivided Highway\|Typical Applications 616.8.47a]] and [[616.23 Traffic Control for Field Operations#TA-47a Excavations with Steel Plate or Backfill - Divided Highway\|616.8.47b]].

	Failures less than 1 in. deep are called spalls. Failures over 1 in. deep but that do not go through the deck are classed as partial depth.		Failures less than 1 in. deep are called spalls. Failures over 1 in. deep but that do not go through the deck are classed as partial depth.

EPG-Admin: Structural Steel ASTM A441 has been withdrawn

2009-12-08T19:17:58Z

Structural Steel ASTM A441 has been withdrawn

← Older revision		Revision as of 14:17, 8 December 2009
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	The bridge superstructure consists of that portion of the bridge above the bearings. Maintenance consists of repairs to the deck, handrail, curbs, floor system and structural members. Maintenance of structural members is normally minor unless members are damaged by collision or fire. Major damage to structural members which may affect the load carrying capacity must be reported immediately to Central Office Bridge Maintenance. If any doubt exists as to safety, the bridge should be closed until an inspection can be made and the damages determined.		The bridge superstructure consists of that portion of the bridge above the bearings. Maintenance consists of repairs to the deck, handrail, curbs, floor system and structural members. Maintenance of structural members is normally minor unless members are damaged by collision or fire. Major damage to structural members which may affect the load carrying capacity must be reported immediately to Central Office Bridge Maintenance. If any doubt exists as to safety, the bridge should be closed until an inspection can be made and the damages determined.

	Girder ends under open expansion joints of all steel bridges should be flushed regularly to remove snow and ice control chemicals, dirt and debris. Truss members in the splash zone and lower chords should also be regularly flushed. Bridges with ~~A-588~~ weathering steel do not retain the protective oxide layer in the presence of snow and ice control chemicals. Therefore, it is important to regularly [[771.2 Bridge Cleaning and Flushing\|clean and flush]] these bridges under open joints.		Girder ends under open expansion joints of all steel bridges should be flushed regularly to remove snow and ice control chemicals, dirt and debris. Truss members in the splash zone and lower chords should also be regularly flushed. Bridges with ASTM A709 weathering steel do not retain the protective oxide layer in the presence of snow and ice control chemicals. Therefore, it is important to regularly [[771.2 Bridge Cleaning and Flushing\|clean and flush]] these bridges under open joints.
	{\|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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EPG-Admin: Added Links to Innovation Library.

2009-04-07T15:27:36Z

Added Links to Innovation Library.

@@ Line 2: / Line 2: @@
 Girder ends under open expansion joints of all steel bridges should be flushed regularly to remove snow and ice control chemicals, dirt and debris. Truss members in the splash zone and lower chords should also be regularly flushed. Bridges with A-588 weathering steel do not retain the protective oxide layer in the presence of snow and ice control chemicals. Therefore, it is important to regularly [[771.2 Bridge Cleaning and Flushing|clean and flush]] these bridges under open joints.
+{|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#ffddcc" width="210px" align="right"
 ==770.7.1 General Bridge Deck Maintenance==
 The maintenance of bridge decks must be timely and performed to a high standard to prevent further deterioration and to protect the investment. Repair of holes or deterioration must be done immediately and not delayed for approval at the time of the annual bridge inspection. Bridge decks that present unusual problems may require contract repair.