413.3 Ultrathin Bonded Asphalt Wearing Surface - Revision history

Legged1: /* 413.3.4 Membrane Application Rate */ terminology

2024-03-06T21:53:15Z

413.3.4 Membrane Application Rate: terminology

← Older revision		Revision as of 16:53, 6 March 2024
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	\|Surface Recycle\|\| New\|\| 0.00		\|Surface Recycle\|\| New\|\| 0.00
	\|-		\|-
	\|rowspan="3"\|~~Chip~~ Seal\|\| Flushed\|\| -0.03		\|rowspan="3"\|Seal Coat\|\| Flushed\|\| -0.03
	\|-		\|-
	\|Worn\|\| +0.01		\|Worn\|\| +0.01

Hallej1 at 14:58, 30 August 2022

2022-08-30T14:58:51Z

← Older revision		Revision as of 09:58, 30 August 2022
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	\|'''NovaChip'''		\|'''NovaChip'''
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			\|[https://spexternal.modot.mo.gov/sites/cm/CORDT/PD98055_Brief.pdf Summary 1999]
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	\|[https://spexternal.modot.mo.gov/sites/cm/CORDT/PD98055_Brief.pdf Summary 1999]		\|[https://spexternal.modot.mo.gov/sites/cm/CORDT/PD98055_Brief.pdf Summary 1999]

Hallej1 at 14:34, 30 August 2022

2022-08-30T14:34:59Z

← Older revision		Revision as of 09:34, 30 August 2022
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	\|'''NovaChip'''		\|'''NovaChip'''
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	\|[~~http~~://~~library~~.modot.mo.gov/~~RDT~~/~~reports~~/~~Pd98055~~/~~Br98055~~.pdf ~~Summary 1999]~~		\|[https://spexternal.modot.mo.gov/sites/cm/CORDT/PD98055_Brief.pdf Summary 1999]
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	~~\|[http://library.modot.mo.gov/RDT/reports/Pd98055/brief.htm~~ Summary 1999]
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	\|'''See also:''' [https://www.modot.org/research-publications Research Publications]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]

Hallej1 at 18:16, 18 August 2022

2022-08-18T18:16:24Z

← Older revision		Revision as of 13:16, 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]
	\|}		\|}

Smithk: /* 413.3.2 Laboratory Procedure */ Per CM, removed archaic SiteManager info and replaced with AASHTOWARE info

2021-10-01T14:13:04Z

413.3.2 Laboratory Procedure: Per CM, removed archaic SiteManager info and replaced with AASHTOWARE info

← Older revision		Revision as of 09:13, 1 October 2021
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	==413.3.2 Laboratory Procedure==		==413.3.2 Laboratory Procedure==
	Test results and calculations required for Ultrathin bonded asphalt wearing surface trial mixtures are as shown in EPG 413.3.2.1 through EPG 413.3.2.11, below. Test results and calculations shall be recorded through ~~SiteManager~~.		Test results and calculations required for Ultrathin bonded asphalt wearing surface trial mixtures are as shown in EPG 413.3.2.1 through EPG 413.3.2.11, below. Test results and calculations shall be recorded through AASHTOWARE Project (AWP).

	'''413.3.2.1''' The Los Angeles Abrasion value of the aggregate shall be determined, when required, in accordance with AASHTO T 96. Los Angeles Abrasion shall be determined on an individual ledge basis.		'''413.3.2.1''' The Los Angeles Abrasion value of the aggregate shall be determined, when required, in accordance with AASHTO T 96. Los Angeles Abrasion shall be determined on an individual ledge basis.

Smithk at 20:09, 18 August 2020

2020-08-18T20:09:43Z

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	\|[http://library.modot.mo.gov/RDT/reports/Pd98055/brief.htm Summary 1999]		\|[http://library.modot.mo.gov/RDT/reports/Pd98055/brief.htm Summary 1999]
	\|-		\|-
	\|'''See also:''' [~~http~~://www.modot.~~gov~~/~~services/OR/byDate.htm Innovation Library~~]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]
	\|}		\|}
	===413.3.1.1 Procedure===		===413.3.1.1 Procedure===

Smithk at 15:00, 22 May 2020

2020-05-22T15:00:25Z

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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]]
	\|}		\|}

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

2020-05-22T12:03:06Z

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 07:03, 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]]
	\|}		\|}

Smithk: Per CM, added the already existing (in other articles) reference to the AC Index Price Adjustment Guidance

2019-03-27T19:56:01Z

Per CM, added the already existing (in other articles) reference to the AC Index Price Adjustment Guidance

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 |'''See also:''' [http://www.modot.gov/services/OR/byDate.htm Innovation Library]
 |}
 ===413.3.1.1 Procedure===
 '''Mix Design Procedure'''

Smithk: Per EPS, re-instated delayed CM's clarification of the UBAWS Treatment policy, including identifying the proper thicknesses for UBAWS types.

2019-01-25T14:42:40Z

Per EPS, re-instated delayed CM's clarification of the UBAWS Treatment policy, including identifying the proper thicknesses for UBAWS types.

← Older revision		Revision as of 09:42, 25 January 2019
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	==413.3.3 Maintenance Surface Treatment==		==413.3.3 Maintenance Surface Treatment==
	An ultra-thin (< 1”) ~~hot mix~~ asphalt (~~HMA~~) ~~bonded wearing course~~ is a hot mix asphalt overlay placed over a heavy asphalt emulsion layer or membrane. The thickness ranges from 1/2 to 3/4 in. The system is placed on a structurally sound flexible pavement that may exhibit minor amounts of surface distress. The layer thickness is determined by the maximum aggregate size in the HMA. The asphalt emulsion is usually polymer modified emulsion applied at 0.~~20 ±~~ 0.07 gal/yd<sup>2</sup>. The HMA is a gap-graded mix using a crushed aggregate bound together with a mastic made of sand, filler, and asphalt binder. The maximum aggregate size ranges from 1/4 to 1/2 in. Generally a 3/8 in. mix is used. The grade of the asphalt binder is chosen based on the climate and the traffic conditions for the project. The binder content generally ranges from 5% to 6% depending on the traffic, climate and condition of the existing pavement.
			An ultra-thin (< 1”) bonded asphalt wearing surface (UBAWS) is a hot mix asphalt (HMA) overlay placed over a heavy asphalt emulsion layer or membrane. The thickness ranges from 1/2 in. to 3/4 inch. The table below lists the minimum lift thickness for each UBAWS type based on the nominal maximum aggregate size allowed for the mixture. However, if rumble stripes are to be installed on the UBAWS treatment, the minimum thickness for all UBAWS types should be 3/4 inch.

			{\| border="1" class="wikitable" style="margin: 1em auto 1em auto"
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			! style="background:#BEBEBE"\|UBAWS Type !! style="background:#BEBEBE"\|Minimum Lift Thickness
			\|-
			\| align="center"\|Type A\|\| align="center"\| 1/2 inch
			\|-
			\| align="center"\|Type B \|\| align="center"\|3/4 inch
			\|-
			\| align="center"\|Type C\|\| align="center"\| 3/4 inch
			\|}

			The system is placed on a structurally sound flexible pavement that may exhibit minor amounts of surface distress. The layer thickness is determined by the maximum aggregate size in the HMA. The asphalt emulsion is usually polymer modified emulsion applied at a target rate of 0.15 gal/yd<sup>2</sup> for Type A UBAWS and 0.19 gal/yd<sup>2</sup> for Type B and Type C UBAWS. The HMA is a gap-graded mix using a crushed aggregate bound together with a mastic made of sand, filler, and asphalt binder. The maximum aggregate size ranges from 1/4 in. to 1/2 inch. Generally a 3/8 in. mix is used. The grade of the asphalt binder is chosen based on the climate and the traffic conditions for the project. The binder content generally ranges from 5% to 6% depending on the traffic, climate and condition of the existing pavement.

	The ultra-thin bonded wearing course is placed with a specially built machine that places the asphalt emulsion membrane and HMA in a single pass. The heavy application of the asphalt membrane seals small cracks in the existing pavement and helps to ensure the adhesion of the HMA to the underlying pavement.		The ultra-thin bonded wearing course is placed with a specially built machine that places the asphalt emulsion membrane and HMA in a single pass. The heavy application of the asphalt membrane seals small cracks in the existing pavement and helps to ensure the adhesion of the HMA to the underlying pavement.
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	The primary function of the ultra-thin bonded wearing course is to provide a durable, friction resistant surface on an existing flexible pavement. Specifications generally require one of three gradations. The gradation should be based on the traffic level, and the surface condition of the roadway. The thickness is approximately 1.5 times the maximum aggregate size.		The primary function of the ultra-thin bonded wearing course is to provide a durable, friction resistant surface on an existing flexible pavement. Specifications generally require one of three gradations. The gradation should be based on the traffic level, and the surface condition of the roadway. The thickness is approximately 1.5 times the maximum aggregate size.

	For flexible pavements, the ultra-thin bonded HMA should not be used when the cracking exceeds the moderate severity levels. Any cracks greater than 1/4 in. should be cleaned and ~~sealed~~. Patches and potholes should not exceed moderate severity levels. All potholes and any alligator cracked areas should be properly repaired. Rutting should not exceed 1/2 in. If the rutting does exceed this limit the surface should be milled or the ruts filled with a suitable materials prior to placing the ultra-thin overlay.		For flexible pavements, the ultra-thin bonded HMA should not be used when the cracking exceeds the moderate severity levels. Any cracks greater than 1/4 in. should be cleaned and filled. A separate bid item should be included in the contract in accordance with Sec 413.70 or Sec 413.80.

			Patches and potholes should not exceed moderate severity levels. All potholes and any alligator cracked areas should be properly repaired in accordance with Sec 613.35 with a separate bid item. Rutting should not exceed 1/2 inch. If the rutting does exceed this limit the surface should be milled or the ruts filled with a suitable materials prior to placing the ultra-thin overlay.

	The ultra-thin bonded HMA overlay is applicable to all traffic levels, but because of its cost it is generally considered for high speed and high volume roadways.		The ultra-thin bonded HMA overlay is applicable to all traffic levels, but because of its cost it is generally considered for high speed and high volume roadways.