Category:625 Slab Stabilization - Revision history

Hoskir: /* 625.2.1 Project Scoping and Design */ updated JSP link

2023-03-03T18:14:55Z

625.2.1 Project Scoping and Design: updated JSP link

← Older revision		Revision as of 13:14, 3 March 2023
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	In past decades, MoDOT maintenance forces have logged many miles of slab jacking; however, the treatment has become something of a lost art for most employees, either because of retirement turnover or bad experiences with slab failures from overjacking. Therefore, in nearly all cases the designer should depend on contract work to perform a slab jacking operation. Both cementitious grout, which is split out into Portland cement and flyash pay items, and high density polyurethane are paid for by the pound. Drilled holes are incidental and included in the material prices.		In past decades, MoDOT maintenance forces have logged many miles of slab jacking; however, the treatment has become something of a lost art for most employees, either because of retirement turnover or bad experiences with slab failures from overjacking. Therefore, in nearly all cases the designer should depend on contract work to perform a slab jacking operation. Both cementitious grout, which is split out into Portland cement and flyash pay items, and high density polyurethane are paid for by the pound. Drilled holes are incidental and included in the material prices.

	The contract should be set up with alternate sections for bid items allowing the bidder to choose between "Slab Jacking Material High Density Polyurethane" and "Slab Jacking Material Cementitious Grout". The Job Special Provision [https://~~spexternal~~.modot.~~mo.gov/sites/de~~/~~_layouts~~/15/~~WopiFrame~~.aspx?sourcedoc=%2Fsites%2Fde%2FJSP%2FJSP0905%2Edoc&action=view&source=https%3A%2F%2Fspexternal%2Emodot%2Emo%2Egov%2Fsites%2Fde%2FJSP%2FForms%2FJSPByTitle%2Easpx%3FGroupString%3D%253B%2523Non%2520Standard%253B%2523%26IsGroupRender%3DTRUE Alternates for Slab Stabilization JSP-09-05] must also be used when the contract has alternate bid items for slab stabilization.		The contract should be set up with alternate sections for bid items allowing the bidder to choose between "Slab Jacking Material High Density Polyurethane" and "Slab Jacking Material Cementitious Grout". The Job Special Provision [https://epg.modot.org/forms/JSP/JSP0905.docx Alternates for Slab Stabilization JSP-09-05] must also be used when the contract has alternate bid items for slab stabilization.

	===625.2.2 Construction Inspection for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 625.20 Slab Jacking]===		===625.2.2 Construction Inspection for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 625.20 Slab Jacking]===

Hallej1: /* 625.1.2 Construction Inspection for Sec 625.10 Slab Undersealing */

2022-08-18T18:15:51Z

625.1.2 Construction Inspection for Sec 625.10 Slab Undersealing

← Older revision		Revision as of 13:15, 18 August 2022
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	\|'''AC Price Index Adjustments'''		\|'''AC Price Index Adjustments'''
	\|-		\|-
	\|[~~[media~~:~~403 Guidance for Asphalt Cement Price Index Adjustments May 22 2020~~.docx\|Guidance for Asphalt Cement Price Index Adjustments]]		\|[https://epg.modot.org/forms/CM/403_Guidance_for_Asphalt_Cement_Price_Index_Adjustments.docx Guidance for Asphalt Cement Price Index Adjustments]
	\|}		\|}
	The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:		The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:

Smithk at 20:08, 18 August 2020

2020-08-18T20:08:10Z

← Older revision		Revision as of 15:08, 18 August 2020
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	\|[http://library.modot.mo.gov/RDT/reports/Ri96017/Brf2000.htm Summary 2000]		\|[http://library.modot.mo.gov/RDT/reports/Ri96017/Brf2000.htm Summary 2000]
	\|-		\|-
	\|'''See also:''' [~~http~~://www.modot.~~gov~~/~~services/OR/byDate.htm Innovation Library~~]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]
	\|}		\|}
	Undersealing Portland cement concrete (PCC) pavements with either high density polyurethane or hot asphalt cement is a preservation treatment that prolongs pavement life by filling subsurface voids and eliminating slab movement. Undersealing may also correct slight faulting (≤ 1/8 in.) at transverse joints and working cracks, but is not intended to correct moderate to severe faulting. Diamond grinding, or if the condition warrants, an asphalt overlay, is the proper treatment to restore surface ride and should normally be combined with undersealing in any contract. Undersealing is usually reserved for bare PCC pavements. In unusual circumstances, a composite pavement (HMA overlay on PCC) may be undersealed if an analysis by the Pavement Section determines it is the optimum treatment for restoration. Care is taken to provide uniform material coverage under the slab so that larger voids are not created and the problem is instead made worse.		Undersealing Portland cement concrete (PCC) pavements with either high density polyurethane or hot asphalt cement is a preservation treatment that prolongs pavement life by filling subsurface voids and eliminating slab movement. Undersealing may also correct slight faulting (≤ 1/8 in.) at transverse joints and working cracks, but is not intended to correct moderate to severe faulting. Diamond grinding, or if the condition warrants, an asphalt overlay, is the proper treatment to restore surface ride and should normally be combined with undersealing in any contract. Undersealing is usually reserved for bare PCC pavements. In unusual circumstances, a composite pavement (HMA overlay on PCC) may be undersealed if an analysis by the Pavement Section determines it is the optimum treatment for restoration. Care is taken to provide uniform material coverage under the slab so that larger voids are not created and the problem is instead made worse.

Smithk at 15:01, 22 May 2020

2020-05-22T15:01:44Z

← Older revision		Revision as of 10:01, 22 May 2020
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	\|'''AC Price Index Adjustments'''		\|'''AC Price Index Adjustments'''
	\|-		\|-
	\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments 2020.docx\|Guidance for Asphalt Cement Price Index Adjustments]]		\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments May 22 2020.docx\|Guidance for Asphalt Cement Price Index Adjustments]]
	\|}		\|}
	The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:		The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:

Smithk: Per CM and DE, in the "Guidance for Asphalt Cement Price Index Adjustments" added CMS boards to Seal Coat projects

2020-05-22T12:04:40Z

Per CM and DE, in the "Guidance for Asphalt Cement Price Index Adjustments" added CMS boards to Seal Coat projects

← Older revision		Revision as of 07:04, 22 May 2020
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	\|'''AC Price Index Adjustments'''		\|'''AC Price Index Adjustments'''
	\|-		\|-
	\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments ~~May 2018~~.docx\|Guidance for Asphalt Cement Price Index Adjustments]]		\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments 2020.docx\|Guidance for Asphalt Cement Price Index Adjustments]]
	\|}		\|}
	The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:		The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:

EPGsysop: Per DE, minor updates to "Guidance for Asphalt Cement Price Index Adjustments"

2018-05-24T15:32:28Z

Per DE, minor updates to "Guidance for Asphalt Cement Price Index Adjustments"

← Older revision		Revision as of 10:32, 24 May 2018
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	\|'''AC Price Index Adjustments'''		\|'''AC Price Index Adjustments'''
	\|-		\|-
	\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments 2018.docx\|Guidance for Asphalt Cement Price Index Adjustments]]		\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments May 2018.docx\|Guidance for Asphalt Cement Price Index Adjustments]]
	\|}		\|}
	The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:		The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:

EPGsysop: Per CM, revised "Guidance for Asphalt Cement Price Index Adjustments" to include info about contingent item work.

2018-01-18T14:53:57Z

Per CM, revised "Guidance for Asphalt Cement Price Index Adjustments" to include info about contingent item work.

← Older revision		Revision as of 09:53, 18 January 2018
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	\|'''AC Price Index Adjustments'''		\|'''AC Price Index Adjustments'''
	\|-		\|-
	\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments.docx\|Guidance for Asphalt Cement Price Index Adjustments]]		\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments 2018.docx\|Guidance for Asphalt Cement Price Index Adjustments]]
	\|}		\|}
	The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:		The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:

EPGsysop: /* 625.1.2 Construction Inspection for Sec 625.10 Slab Undersealing */Per CM, clarified measurement of liquid asphalt cement

2017-08-10T15:55:13Z

625.1.2 Construction Inspection for Sec 625.10 Slab Undersealing: Per CM, clarified measurement of liquid asphalt cement

← Older revision		Revision as of 10:55, 10 August 2017
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	The drill patterns for polyurethane and asphalt are different – typically asphalt requires a few large diameter (approximately 1 - 1/2 in.) holes, while high density polyurethane uses more frequent small diameter (approximately 5/8 in.) holes. The patterns will also vary depending on whether just the slab end is being stabilized or the intent is to underseal the entire slab. Not all holes need necessarily be filled; some may simply be used to observe seepage and confirm material coverage.		The drill patterns for polyurethane and asphalt are different – typically asphalt requires a few large diameter (approximately 1 - 1/2 in.) holes, while high density polyurethane uses more frequent small diameter (approximately 5/8 in.) holes. The patterns will also vary depending on whether just the slab end is being stabilized or the intent is to underseal the entire slab. Not all holes need necessarily be filled; some may simply be used to observe seepage and confirm material coverage.
			<div id="Measurement of the liquid asphalt cement"></div>
			Measurement of the liquid asphalt cement used for undersealing shall be based on the volume at 60° F. The material delivery tickets should include the weight of material and the specific gravity to convert the volume to gallons at 60° F.

	==625.2 Slab Jacking==		==625.2 Slab Jacking==

EPGsysop: /* 625.1.2 Construction Inspection for Sec 625.10 Slab Undersealing */ Per CM, added "Guidance for Asphalt Cement Price Index Adjustments".

2017-06-23T15:59:18Z

625.1.2 Construction Inspection for Sec 625.10 Slab Undersealing: Per CM, added "Guidance for Asphalt Cement Price Index Adjustments".

← Older revision		Revision as of 10:59, 23 June 2017
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	===625.1.2 Construction Inspection for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 625.10 Slab Undersealing]===		===625.1.2 Construction Inspection for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 625.10 Slab Undersealing]===
			{\|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="200px" align="right"
			\|-
			\|'''AC Price Index Adjustments'''
			\|-
			\|[[media:403 Guidance for Asphalt Cement Price Index Adjustments.docx\|Guidance for Asphalt Cement Price Index Adjustments]]
			\|}
	The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:		The current undersealing specification is driven by performance results, i.e. increased slab support, therefore the contractor is responsible for determining and providing the appropriate personnel and equipment. The MoDOT inspector should be primarily concerned with the following concerns:

Smithk: updated link

2016-07-22T15:01:23Z

updated link

← Older revision		Revision as of 10:01, 22 July 2016
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	\|[[570.5 Mudjacking (Slab Jacking) by MoDOT Maintenance\|Mudjacking (Slab Jacking) by MoDOT Maintenance]]		\|[[570.5 Mudjacking (Slab Jacking) by MoDOT Maintenance\|Mudjacking (Slab Jacking) by MoDOT Maintenance]]
	\|-		\|-
	\|[[~~media~~:R314 - Pavement ~~Leveling.pdf~~\|Maintenance Planning Guideline for Pavement Leveling (Mudjacking or Other Methods)]]		\|[[:Category:170 Maintenance Activity Planning Guidelines#R314 Other Pavement Maintenance\|Maintenance Planning Guideline for Pavement Leveling (Mudjacking or Other Methods)]]
	\|-		\|-
	\|[[771.1 Mud Jacking Bridge Approach\|Mud Jacking Bridge Approach]]		\|[[771.1 Mud Jacking Bridge Approach\|Mud Jacking Bridge Approach]]
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	==625.2 Slab Jacking==		==625.2 Slab Jacking==
	The process of raising PCC pavement slabs and filling subsurface voids with cementitious grout or high density polyurethane is known as "slab jacking". Slab jacking is typically not used for mainline pavement, but rather at bridge approach slabs which have experienced significant settlement (see [[771.1 Mud Jacking Bridge Approach\|Mud Jacking Bridge Approach]].		The process of raising PCC pavement slabs and filling subsurface voids with cementitious grout or high density polyurethane is known as "slab jacking". Slab jacking is typically not used for mainline pavement, but rather at bridge approach slabs which have experienced significant settlement (see [[771.1 Mud Jacking Bridge Approach\|Mud Jacking Bridge Approach]]).

	===625.2.1 Project Scoping and Design===		===625.2.1 Project Scoping and Design===