712 - Bridge Rehabilitation, Concrete - Revision history

SchaeferS: /* Hydrodemolition */ Added the Site Activation/Deactivation information to the Hydrodemolition section

2021-02-09T21:17:11Z

Hydrodemolition: Added the Site Activation/Deactivation information to the Hydrodemolition section

Clarkj25: /* Sample Hydrodemolition pH Control Plan */

2019-07-11T17:08:51Z

Sample Hydrodemolition pH Control Plan

Clarkj25: /* Sample Hydrodemolition pH Control Plan */

2019-07-11T17:07:51Z

Sample Hydrodemolition pH Control Plan

Clarkj25: /* Sample Hydrodemolition pH Control Plan */ EGLE updates

2019-07-11T17:06:59Z

Sample Hydrodemolition pH Control Plan: EGLE updates

Clarkj25: /* Sample Hydrodemolition pH Control Plan */

2019-07-11T17:06:08Z

Sample Hydrodemolition pH Control Plan

Clarkj25: /* Sample Hydrodemolition pH Control Plan */

2019-07-11T17:04:47Z

Sample Hydrodemolition pH Control Plan

Clarkj25: /* Hydrodemolition Water Discharge */ EGLE udpate

2019-07-11T17:04:10Z

Hydrodemolition Water Discharge: EGLE udpate

McGowanR: /* Crack Sealing */ Fixed broken link for QPL

2019-01-17T18:51:06Z

Crack Sealing: Fixed broken link for QPL

McGowanR: /* Silca Fume Modified Concrete (SFMC) */

2015-12-08T13:44:53Z

Silca Fume Modified Concrete (SFMC)

HarrisR18: /* Thin Overlay Surface Preperation */

2014-10-20T19:03:54Z

Thin Overlay Surface Preperation

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-====[[#Hydrpdemolition|Hydrodemolition]]====
+====[[#Hydrodemolition|Hydrodemolition]]====
 Hydrodemolition is used after scarifying to remove unsound concrete to reinforcing steel without damaging the steel and to eliminate any micro cracks that may have been caused during scarifying.  The ¼ inch scarify is necessary to promote an efficient hydrodemolition and to remove significantly unsound areas of concrete prior to the first hydro pass.  The hydrodemolition equipment must be calibrated to the desired depth as indicated on the plans prior to the first pass.  After the first pass has been completed, the Engineer will mark any unsound areas remaining in the deck concrete.  These areas may be removed with a second hydrodemolition pass or by hand chipping with pneumatic chipping hammers (60 lbs or less).  Effort must be made not to damage the exposed reinforcing steel during concrete removal.
 If the depth of removed concrete meets or exceeds 3”, the Engineer will not allow heavy equipment, including vacuum and concrete trucks, on the prepared deck surface.
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 '''o. Contractor Responsibility for Method of Operations''' - ''(Insert company name)'' will comply with all environmental laws and regulations.
-'''p. Records '''- ''(Insert company name)'' will maintain a copy of all manifests for three years and make them available to MDEQ upon request.
+'''p. Records '''- ''(Insert company name)'' will maintain a copy of all manifests for three years and make them available to EGLE upon request.
 '''Hydrodemolition Project Checklist''' – see below for a sample. hydrodemolition project pH Control Plan checklist.

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 '''i. Non-Hazardous Waste''' - If the hydrodemolition runoff water is nonhazardous, then the runoff water will be transported by ''(Insert licensed liquid industrial waste transport company name)'' for disposal at ''(Insert licensed liquid industrial disposal company name or public owned treatment works)''. Copies of waste manifests forms will be forwarded to the engineer.
-'''j. Generator and/or Transport Site Identification Number''' - ''(Insert company name)''  will either obtain a generator or site identification number from the MDEQ Waste and Hazardous Materials Division or use a licensed liquid industrial waste hauler to transport the hydrodemolition runoff water. List the site identification number for each structure:  ''(Insert Structure Location and Structure Name)'' is ''(Insert Site ID Number)''. ''(Insert licensed liquid industrial waste transport company name)'' will transport the hydrodemolition runoff water. ''(Insert company name)'' will contact the engineer to request a site identification number from MDEQ
+'''j. Generator and/or Transport Site Identification Number''' - ''(Insert company name)''  will either obtain a generator or site identification number from the EGLE Waste and Hazardous Materials Division or use a licensed liquid industrial waste hauler to transport the hydrodemolition runoff water. List the site identification number for each structure:  ''(Insert Structure Location and Structure Name)'' is ''(Insert Site ID Number)''. ''(Insert licensed liquid industrial waste transport company name)'' will transport the hydrodemolition runoff water. ''(Insert company name)'' will contact the engineer to request a site identification number from EGLE
 '''k. Discharge''' - ''(Insert company name)'' will not discharge into any surface waters of the state, storm water drainage systems, or in areas where discharging is not permitted.  ''(Insert company name)'' will coordinate the collecting, hauling, proper disposal of the hydrodemolition runoff water, and will obtain approval from the engineer for the discharge method and location prior to beginning the hydrodemolition operation. The discharge of the runoff water will only occur on MDOT right of way and will be distributed as evenly as possible. Discharge will be minimized via curb side culverts and downspouts. ''(Insert company name)'' will record hours of the hydrodemolition process and the volume of water discharged. Measures will be maintained for managing the runoff water by ''(Insert company name)'' in good working order.

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 '''d. Sampling and Testing''' - The hydrodemolition runoff water produced by the hydrodemolition equipment will be sampled and tested immediately to determine whether it falls within the nonhazardous range (greater than 2 and less than 12.5) by ''(Insert tester’s name or names)''. A daily calibrated ''(Insert pH meter model and name)'' will be utilized and calibrated by  ''(Insert tester’s name or names)''.
-On this hydrodemolition project, a minimum of four independent hydrodemolition runoff water samples will be taken per day for each structure and recorded. Additional sampling may be taken depending on the volume of runoff generated, consistency of pH, and area of the bridge deck. Sampling will be spaced evenly throughout the work day although the frequency may be adjusted depending on change in the hours of operation. The samples will be tested and split into laboratory samples. Four hydrodemolition runoff samples will be tested by an MDEQ certified laboratory. The EGLE certified laboratory will be  ''(Insert name of testing laboratory)'' and the laboratory contact person is (Insert contact name) and can be reached at  ''(Insert testing laboratory phone number)''. The laboratory will check and verify the pH and provide daily a written report to be forwarded to the resident/delivery engineer. If the laboratory tests are not consistent with the field results, ''(Insert company name)'' will '(Insert proposed action, options include recalibrating pH meter, changing meters, stoppage of work, neutralizing, etc)''.
+On this hydrodemolition project, a minimum of four independent hydrodemolition runoff water samples will be taken per day for each structure and recorded. Additional sampling may be taken depending on the volume of runoff generated, consistency of pH, and area of the bridge deck. Sampling will be spaced evenly throughout the work day although the frequency may be adjusted depending on change in the hours of operation. The samples will be tested and split into laboratory samples. Four hydrodemolition runoff samples will be tested by a Michigan Department of Environment, Great Lakes, and Energy (EGLE) certified laboratory. The EGLE certified laboratory will be  ''(Insert name of testing laboratory)'' and the laboratory contact person is (Insert contact name) and can be reached at  ''(Insert testing laboratory phone number)''. The laboratory will check and verify the pH and provide daily a written report to be forwarded to the resident/delivery engineer. If the laboratory tests are not consistent with the field results, ''(Insert company name)'' will '(Insert proposed action, options include recalibrating pH meter, changing meters, stoppage of work, neutralizing, etc)''.
 Test results will be recorded on the hydrodemolition log.

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 '''d. Sampling and Testing''' - The hydrodemolition runoff water produced by the hydrodemolition equipment will be sampled and tested immediately to determine whether it falls within the nonhazardous range (greater than 2 and less than 12.5) by ''(Insert tester’s name or names)''. A daily calibrated ''(Insert pH meter model and name)'' will be utilized and calibrated by  ''(Insert tester’s name or names)''.
-On this hydrodemolition project, a minimum of four independent hydrodemolition runoff water samples will be taken per day for each structure and recorded. Additional sampling may be taken depending on the volume of runoff generated, consistency of pH, and area of the bridge deck. Sampling will be spaced evenly throughout the work day although the frequency may be adjusted depending on change in the hours of operation. The samples will be tested and split into laboratory samples. Four hydrodemolition runoff samples will be tested by an MDEQ certified laboratory. The MDEQ certified laboratory will be  ''(Insert name of testing laboratory)'' and the laboratory contact person is (Insert contact name) and can be reached at  ''(Insert testing laboratory phone number)''. The laboratory will check and verify the pH and provide daily a written report to be forwarded to the resident/delivery engineer. If the laboratory tests are not consistent with the field results, ''(Insert company name)'' will '(Insert proposed action, options include recalibrating pH meter, changing meters, stoppage of work, neutralizing, etc)''.
+On this hydrodemolition project, a minimum of four independent hydrodemolition runoff water samples will be taken per day for each structure and recorded. Additional sampling may be taken depending on the volume of runoff generated, consistency of pH, and area of the bridge deck. Sampling will be spaced evenly throughout the work day although the frequency may be adjusted depending on change in the hours of operation. The samples will be tested and split into laboratory samples. Four hydrodemolition runoff samples will be tested by an MDEQ certified laboratory. The EGLE certified laboratory will be  ''(Insert name of testing laboratory)'' and the laboratory contact person is (Insert contact name) and can be reached at  ''(Insert testing laboratory phone number)''. The laboratory will check and verify the pH and provide daily a written report to be forwarded to the resident/delivery engineer. If the laboratory tests are not consistent with the field results, ''(Insert company name)'' will '(Insert proposed action, options include recalibrating pH meter, changing meters, stoppage of work, neutralizing, etc)''.
 Test results will be recorded on the hydrodemolition log.

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 '''b. Construction''' - ''(Insert company name)'' will perform this work as specified in the Standard Specifications for Construction and the contract documents. Discharged hydrodemolition runoff water will be filtered with a minimum of three peastone filter dams. The peastone dams will be maintained during the entire hydrodemolition and rinsing operations. Dams will not be constructed from millings of the scarified concrete or removed latex concrete. Remove millings prior to beginning the hydrodemolition process.
-''(Insert company name)'' will obtain an MDEQ Certificate of Coverage form and conform to the Groundwater Discharge General Permit.
+''(Insert company name)'' will obtain an EGLE Certificate of Coverage form and conform to the Groundwater Discharge General Permit.
 '''c. pH Control Plan''' - ''(Insert company name)'' staff shall sample, test, monitor, manage, and, if necessary, neutralize the hydrodemolition runoff water prior to discharge and/or disposal. The plan manager will be (Insert name of plan manager).

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 The hydrodemolition contractor is required to obtain a Certificate of Coverage (COC) under the Groundwater Discharge General Permit for hydrodemolition process water prior to beginning hydrodemolition work.  The COC is an annual requirement, regardless of the number and location of hydrodemolition projects a contractor works on.
-The hydrodemolition contractor is responsible for submitting the application and paying the fee when invoiced by the MDEQ.  The coverage under the general permit is effective at the time the contractor receives the COC from the MDEQ.  The COC will indicate the period of coverage.  The project engineer should verify that the coverage will be in effect for the entire period of time that hydrodemolition work will take place on a given project.  A copy of the COC should be provided by the hydrodemolition contractor and placed in the project file.
+The hydrodemolition contractor is responsible for submitting the application and paying the fee when invoiced by the Michigan Department of Environment, Great Lakes, and Energy (EGLE).  The coverage under the general permit is effective at the time the contractor receives the COC from the EGLE.  The COC will indicate the period of coverage.  The project engineer should verify that the coverage will be in effect for the entire period of time that hydrodemolition work will take place on a given project.  A copy of the COC should be provided by the hydrodemolition contractor and placed in the project file.
 The contractor shall submit a hydrodemolition pH control plan for review and acceptance prior to beginning any hydrodemolition work.  The following is a sample hydrodemolition pH control plan:

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 ====[[#Crack Sealing|Crack Sealing]]====
-Crack sealing in bridge decks is effective for those bridge decks with few cracks not warranting a complete flood coating of the deck.  The cracks are prepared for sealant by lightly abrasive blasting the crack and 1 inch to 2 inches either side of the crack to remove debris, clean the adjacent surface and open up the crack to facilitate penetration of the epoxy sealant.  The approved sealant (typically a two part epoxy) is mixed per the manufacturer’s recommendation and applied to the crack until refusal providing a 1 inch overband the entire length of the crack.  The approved crack sealing products can be found in the [http://michigan.gov/documents/MDOT-Material_Source_Guide_Qualified_Products_84764_7.pdf Qualified Products List (QPL)] section of the Sealing Localized Cracks special provision.
+Crack sealing in bridge decks is effective for those bridge decks with few cracks not warranting a complete flood coating of the deck.  The cracks are prepared for sealant by lightly abrasive blasting the crack and 1 inch to 2 inches either side of the crack to remove debris, clean the adjacent surface and open up the crack to facilitate penetration of the epoxy sealant.  The approved sealant (typically a two part epoxy) is mixed per the manufacturer’s recommendation and applied to the crack until refusal providing a 1 inch overband the entire length of the crack.  The approved crack sealing products can be found in the [https://www.michigan.gov/documents/mdot/MDOT-MaterialSourceGuideComplete_Linked_181739_7.pdf Qualified Products List (QPL)] section of the Sealing Localized Cracks special provision.
 After application of the epoxy sealant, the uncured epoxy may be lightly coated with a dry mason sand to prevent tracking, and opened to traffic.  Cure times of the epoxy vary from 1 hour to 12 hours depending on the temperature.  Epoxy should only be applied when temperatures are 40 degrees Fahrenheit and rising.
 Sealing of thin cracks (less than 0.002 inches) in vertical surfaces consists of the same preparation as the sealing of cracks in bridge decks. However; the epoxy will not penetrate the crack.  A more viscous material is used to bridge the crack with a minimum 1 inch overband.

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 Ensure the contractor applies a continuous fog spray of water to the screeded and finished concrete.  Fogging should continue to be applied behind the final floating opeations until placement of the wet cure system (soaker hoses, wet burlap, etc).  After placement, finishing and tining of the SFMC overlay the wet cure should be applied as soon as possible in accordance with [http://mdotcf.state.mi.us/public/specbook/files/2012/712%20Br%20Rehab%20-%20Concrete.pdf subsection 712.03.Q of the Standard Specifications for Construction.]  It is not uncommon for wet burlap to be placed via the work platform within 10-15 minutes after placement.
-SFMC overlays are typically used in overlays with an anticipated depth of 3-6”.  Historically, a shallow overlay 1.5-3” consisted of LMC and a deep overlay 3-6” consisted of SFMC.  With many rigid ove0rlays now incorporating crown and grade corrections, programmed shallow overlays quickly become deeper than 3” and thus SFMC is used.  In the event that an SFMC overlay becomes deeper than 6” in more than a few isolated areas it may be advisable to investigate alternatives to SFMC.  Alternatives such as slag cement overlays or high performance Grade D concretes may be used in lieu of SFMC with approval from the Engineer.
+SFMC overlays are typically used in overlays with an anticipated depth of 3-6”.  Historically, a shallow overlay 1.5-3” consisted of LMC and a deep overlay 3-6” consisted of SFMC.  With many rigid overlays now incorporating crown and grade corrections, programmed shallow overlays quickly become deeper than 3” and thus SFMC is used.  In the event that an SFMC overlay becomes deeper than 6” in more than a few isolated areas it may be advisable to investigate alternatives to SFMC.  Alternatives such as slag cement overlays or high performance Grade D concretes may be used in lieu of SFMC with approval from the Engineer.
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 [[File:Fig712.9.png|600px|thumb|center|Figure 712.10 Thin overlay failure due to improper surface preperation.]]
-Paint striping acts as a bond breaker and must be removed.  A shotblaster may achieve the proper profile where striping is not present, but extra attention with the shotblaster or a line grinder is often needed to remove paint.  If any unsound areas are discovered during shotblasting they should be repaired and the overlay application delayed.  All patches, regardless if fast setting, have to cure for a minimum of 28 days.
+Paint striping acts as a bond breaker and must be removed.  A shotblaster may achieve the proper profile where striping is not present, but extra attention with the shotblaster or a line grinder is often needed to remove paint.  If any unsound areas are discovered during shotblasting they should be repaired and the overlay application delayed.  All patches, regardless of fast setting, have to cure for a minimum of 28 days.
 [[File:Fig712.11.png|600px|thumb|center|Figure 712.11 Proper profile provided by shotblasting a thin overlay floodcoat (CSP 7).]]