Category:408 Prime Coat - Revision history

Hoskir: /* 408.1.5 Method of Measurement (Sec 408.5) */ published per RR3877

2024-05-22T19:47:05Z

408.1.5 Method of Measurement (Sec 408.5): published per RR3877

← Older revision		Revision as of 14:47, 22 May 2024
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	===408.1.5 Method of Measurement (Sec 408.5)===		===408.1.5 Method of Measurement (Sec 408.5)===
	~~If the~~ prime ~~coat consists of a cutback (Type RC~~ or ~~MC liquid~~ asphalt), the ~~quantity~~ to ~~be paid for will be determined in accordance with~~ [~~http~~://www.modot.org/~~business/standards_and_specs/SpecbookEPG.pdf#page=14 Standard Specification Section~~ 1015.~~7.1~~]. The application temperature (rounded to the nearest 5°F) is found in Table 24b of ASTM D1250 and the corresponding correction factor is multiplied by the total gallons of bituminous material used. Assume that the specific gravity of the material is above 0.966. The quantity will be rounded to the nearest 10 gallons.		The volume of prime, whether liquid asphalt or emulsified asphalt is used, changes with temperature (i.e., the volume increases as temperature increases). Therefore, to account for the volume increase, adjustment of the measured volume relative to the volume at 60F is necessary per [https://www.modot.org/missouri-standard-specifications-highway-construction Sec 1015.6].

	If the prime coat ~~consists~~ of ~~an emulsion~~, the quantity to ~~be paid~~ for ~~will~~ be ~~determined~~ in		:'''Liquid Asphalt (Type RC or MC)'''
	accordance with ~~Standard Specification Section~~ 1015.7.2 (~~see~~ [[:Category:~~407 Tack Coat~~#407.1.5 ~~Method of Measurement (Sec~~ 407.5)\|Method of Measurement]] ~~in Tack Coat. The quantity will be rounded to the nearest 10 gallons~~.
			:If the prime coat used is a liquid asphalt cutback (Type RC or MC), the measured quantity, as obtained from (before/after) distributer meter readings, shall be adjusted from the applied temperature to the volume at 60F in accordance with [https://www.modot.org/missouri-standard-specifications-highway-construction Sec 1015.6.1]. The inspector shall record the asphalt meter reading on the distributor at the start and end of application, as well as the observed temperature of the liquid asphalt. The difference in meter readings is the unadjusted volume measurement (in gallons). To determine the pay quantity volume at 60F, multiply the unadjusted volume by the volume correction factor from [https://epg.modot.org/forms/CM/Table_2_Volume_Correction_Factors_for_Liquid%20Asphalt.pdf#page=6 ASTM D4311, Table 2]. Reference the certification (tanker ticket) to determine the specific gravity (SG) at 60F. Use Column A factors for asphalts with a SG of 0.967 or higher, or Column B factors for asphalts with a SG from 0.850 to 0.966.

			:'''Emulsified Asphalt'''

			:If the prime coat used is an emulsified asphalt, the measured quantity, as obtained from (before/after) distributer meter readings, shall be adjusted from the applied temperature to the volume at 60F in accordance with [https://www.modot.org/missouri-standard-specifications-highway-construction Sec 1015.6.2]. The inspector shall record the asphalt meter reading on the distributor at the start and end of application, as well as the observed temperature of the liquid asphalt. The difference in meter readings is the unadjusted volume measurement (in gallons). To determine the pay quantity volume at 60F, use the formula for emulsified asphalt in [[:Category:407_Tack_Coat#407.1.5_Method_of_Measurement_.28Sec_407.5.29\|EPG 407.1.5 Method of Measurement]].

	==408.2 Materials Inspection for Sec 408==		==408.2 Materials Inspection for Sec 408==

Smithk: updated links

2016-06-09T13:17:23Z

updated links

← Older revision		Revision as of 08:17, 9 June 2016
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	If the prime coat is too heavy, it will not be completely absorbed by the base course. Excess prime must be removed. If the prime coat is too light, it will have a light brown color and will be absorbed quickly and will not sufficiently penetrate into the base.		If the prime coat is too heavy, it will not be completely absorbed by the base course. Excess prime must be removed. If the prime coat is too light, it will have a light brown color and will be absorbed quickly and will not sufficiently penetrate into the base.

	The prime coat must be uniformly applied to the base course at the rate specified in the contract. The application rate may need to be adjusted in the field depending on the nature of the base course. The type of material, amount of fines, moisture content, and surface texture of the base course are all factors that affect the application rate. The anticipated weather conditions should also be considered. Adjusting the application rate is acceptable as long as approval is obtained from the RE and the rate is within the range given in [http://www.modot.~~state.mo.us~~/business/standards_and_specs/~~Sec0408~~.pdf Standard Specification Section 408.4.2].		The prime coat must be uniformly applied to the base course at the rate specified in the contract. The application rate may need to be adjusted in the field depending on the nature of the base course. The type of material, amount of fines, moisture content, and surface texture of the base course are all factors that affect the application rate. The anticipated weather conditions should also be considered. Adjusting the application rate is acceptable as long as approval is obtained from the RE and the rate is within the range given in [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=7 Standard Specification Section 408.4.2].

	:Sec 408.4.2.1 The spray bar on the distributor must be set at a height that results in no overlapping of the material.		:Sec 408.4.2.1 The spray bar on the distributor must be set at a height that results in no overlapping of the material.
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	===408.1.5 Method of Measurement (Sec 408.5)===		===408.1.5 Method of Measurement (Sec 408.5)===
	If the prime coat consists of a cutback (Type RC or MC liquid asphalt), the quantity to be paid for will be determined in accordance with [http://www.modot.~~state.mo.us~~/business/standards_and_specs/~~Sec1015~~.pdf Standard Specification Section 1015.7.1]. The application temperature (rounded to the nearest 5°F) is found in Table 24b of ASTM D1250 and the corresponding correction factor is multiplied by the total gallons of bituminous material used. Assume that the specific gravity of the material is above 0.966. The quantity will be rounded to the nearest 10 gallons.		If the prime coat consists of a cutback (Type RC or MC liquid asphalt), the quantity to be paid for will be determined in accordance with [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=14 Standard Specification Section 1015.7.1]. The application temperature (rounded to the nearest 5°F) is found in Table 24b of ASTM D1250 and the corresponding correction factor is multiplied by the total gallons of bituminous material used. Assume that the specific gravity of the material is above 0.966. The quantity will be rounded to the nearest 10 gallons.

	If the prime coat consists of an emulsion, the quantity to be paid for will be determined in		If the prime coat consists of an emulsion, the quantity to be paid for will be determined in
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	===408.3.3 Products===		===408.3.3 Products===
	Asphalt emulsions commonly used for priming are SS-1, SS-1h, CSS-1 and CSS-1h. Cutback asphalt used for priming are usually a low viscosity, medium or rapid curing (MC or RC) cutback asphalt such as SC-70 or MC 30. In general cutbacks may work better than emulsions for priming due to the ability of the cutback’s ability to penetrate and soften the asphaltic surface. Refer to [http://modot.~~mo.gov~~/business/standards_and_specs/~~Sec0408~~.pdf Standard Specification Section 408] for additional information regarding prime coats.		Asphalt emulsions commonly used for priming are SS-1, SS-1h, CSS-1 and CSS-1h. Cutback asphalt used for priming are usually a low viscosity, medium or rapid curing (MC or RC) cutback asphalt such as SC-70 or MC 30. In general cutbacks may work better than emulsions for priming due to the ability of the cutback’s ability to penetrate and soften the asphaltic surface. Refer to [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=7 Standard Specification Section 408] for additional information regarding prime coats.

Smithk: /* 408.2 Materials Inspection for Sec 408 */ minor clarification

2010-04-05T19:15:46Z

408.2 Materials Inspection for Sec 408: minor clarification

← Older revision		Revision as of 14:15, 5 April 2010
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	==408.2 Materials Inspection for Sec 408==		==408.2 Materials Inspection for Sec 408==

	Prime Coat material shall be sampled and inspected in accordance with ~~Field Section~~ 1015 ~~of the Materials Manual~~.		Prime Coat material shall be sampled and inspected in accordance with EPG 1015.

	==408.3 Maintenance Priming==		==408.3 Maintenance Priming==

Smithk: /* 408.1.2 Material (Sec 408.2) */ minor clarification

2010-04-02T19:25:13Z

408.1.2 Material (Sec 408.2): minor clarification

← Older revision		Revision as of 14:25, 2 April 2010
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	===408.1.2 Material (Sec 408.2)===		===408.1.2 Material (Sec 408.2)===
	See also [[#408.2 Materials Inspection for Sec 408\|Materials Inspection]] and [[:Category:1015 Bituminous Material\|1015 Bituminous Material]].		See also [[#408.2 Materials Inspection for Sec 408\|Materials Inspection]] and [[:Category:1015 Bituminous Material\|EPG 1015 Bituminous Material]].

	===408.1.3 Equipment (Sec 408.3)===		===408.1.3 Equipment (Sec 408.3)===

EPG-Admin: Typographical correction.

2008-06-27T14:49:39Z

Typographical correction.

← Older revision		Revision as of 09:49, 27 June 2008
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	===408.1.1 Description (Sec 408.1)===		===408.1.1 Description (Sec 408.1)===
	The purposes of a prime coat are to protect the base course from the weather and increase the bond between the base and the mat, preventing thin lifts from slipping. The base course is not primed if the thickness of the succeeding pavement is greater than 3-3/4 in.		The purposes of a prime coat are to protect the base course from the weather and increase the bond between the base and the mat, preventing thin lifts from slipping. The base course is not primed if the thickness of the succeeding pavement is greater than or equal to 3-3/4 in.

	===408.1.2 Material (Sec 408.2)===		===408.1.2 Material (Sec 408.2)===

EPG-Admin: Reduced asphalt thickness requiring prime coat.

2008-06-18T16:30:41Z

Reduced asphalt thickness requiring prime coat.

← Older revision		Revision as of 11:30, 18 June 2008
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	==408.1 Construction Inspection for Sec 408==		==408.1 Construction Inspection for Sec 408==
	This item is used for pervious surfaces such as earth, aggregate base or cement treated base over which a seal coat or bituminous mixture less than 4 in. thick is to be placed. Generally RC-70 or MC-30 liquid asphalt is used.		This item is used for pervious surfaces such as earth, aggregate base or cement treated base over which a seal coat or bituminous mixture less than 3-3/4 in. thick is to be placed. Generally RC-70 or MC-30 liquid asphalt is used.

	===408.1.1 Description (Sec 408.1)===		===408.1.1 Description (Sec 408.1)===
	The purposes of a prime coat are to protect the base course from the weather and increase the bond between the base and the mat, preventing thin lifts from slipping. The base course is not primed if the thickness of the succeeding pavement is greater than 4 in.		The purposes of a prime coat are to protect the base course from the weather and increase the bond between the base and the mat, preventing thin lifts from slipping. The base course is not primed if the thickness of the succeeding pavement is greater than 3-3/4 in.

	===408.1.2 Material (Sec 408.2)===		===408.1.2 Material (Sec 408.2)===

EPG-Admin at 20:06, 8 November 2007

2007-11-08T20:06:31Z

@@ Line 1: / Line 1: @@
-This item is used for pervious surfaces such as earth, aggregate base or cement treated base over which a seal coat or bituminous mixture less than 4" thick is to be placed. Generally use RC-70 or MC-30 liquid asphalt.
+==408.1 Construction Inspection for Sec 408==
 ===408.1.1 Description (Sec 408.1)===
 The purposes of a prime coat are to protect the base course from the weather and increase the bond between the base and the mat, preventing thin lifts from slipping. The base course is not primed if the thickness of the succeeding pavement is greater than 4 in.
@@ Line 41: / Line 41: @@
 Prime Coat material shall be sampled and inspected in accordance with Field Section 1015 of the Materials Manual.

EPG-Admin at 11:48, 1 November 2007

2007-11-01T11:48:02Z

← Older revision		Revision as of 06:48, 1 November 2007
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			This item is used for pervious surfaces such as earth, aggregate base or cement treated base over which a seal coat or bituminous mixture less than 4" thick is to be placed. Generally use RC-70 or MC-30 liquid asphalt.

	==408.1 Construction Inspection for Sec 408==		==408.1 Construction Inspection for Sec 408==
	===408.1.1 Description (Sec 408.1)===		===408.1.1 Description (Sec 408.1)===

Smithk: /* 408.1.2 Material (Sec 408.2) */ article construction

2007-08-17T19:59:15Z

408.1.2 Material (Sec 408.2): article construction

← Older revision		Revision as of 14:59, 17 August 2007
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	===408.1.2 Material (Sec 408.2)===		===408.1.2 Material (Sec 408.2)===
	See also [[#408.2 Materials Inspection for Sec 408\|Materials Inspection]] and ~~Field Section~~ 1015 ~~of the Materials Manual~~.		See also [[#408.2 Materials Inspection for Sec 408\|Materials Inspection]] and [[:Category:1015 Bituminous Material\|1015 Bituminous Material]].

	===408.1.3 Equipment (Sec 408.3)===		===408.1.3 Equipment (Sec 408.3)===

EPG-Admin at 20:24, 8 June 2007

2007-06-08T20:24:09Z

← Older revision		Revision as of 15:24, 8 June 2007
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	==408.1 Construction Inspection==		==408.1 Construction Inspection for Sec 408==
	===408.1.1 Description (Sec 408.1)===		===408.1.1 Description (Sec 408.1)===
	The purposes of a prime coat are to protect the base course from the weather and increase the bond between the base and the mat, preventing thin lifts from slipping. The base course is not primed if the thickness of the succeeding pavement is greater than 4 in.		The purposes of a prime coat are to protect the base course from the weather and increase the bond between the base and the mat, preventing thin lifts from slipping. The base course is not primed if the thickness of the succeeding pavement is greater than 4 in.

	===408.1.2 Material (Sec 408.2)===		===408.1.2 Material (Sec 408.2)===
	See also [[#408.2 Materials Inspection\|Materials Inspection]] and Field Section 1015 of the Materials Manual.		See also [[#408.2 Materials Inspection for Sec 408\|Materials Inspection]] and Field Section 1015 of the Materials Manual.

	===408.1.3 Equipment (Sec 408.3)===		===408.1.3 Equipment (Sec 408.3)===
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	accordance with Standard Specification Section 1015.7.2 (see [[:Category:407 Tack Coat#407.1.5 Method of Measurement (Sec 407.5)\|Method of Measurement]] in Tack Coat. The quantity will be rounded to the nearest 10 gallons.		accordance with Standard Specification Section 1015.7.2 (see [[:Category:407 Tack Coat#407.1.5 Method of Measurement (Sec 407.5)\|Method of Measurement]] in Tack Coat. The quantity will be rounded to the nearest 10 gallons.

	==408.2 Materials Inspection==		==408.2 Materials Inspection for Sec 408==

	Prime Coat material shall be sampled and inspected in accordance with Field Section 1015 of the Materials Manual.		Prime Coat material shall be sampled and inspected in accordance with Field Section 1015 of the Materials Manual.