302 - Aggregate Base Courses - Revision history

Clarkj25: /* CONSTRUCTION */

2025-09-08T17:48:24Z

CONSTRUCTION

Clarkj25: /* Pictures of Equipment */

2025-09-08T17:45:32Z

Pictures of Equipment

Clarkj25: /* Pictures of Equipment */

2025-09-08T17:42:58Z

Pictures of Equipment

Clarkj25: /* Pictures of Equipment */

2025-09-08T17:37:38Z

Pictures of Equipment

Clarkj25: /* Pictures of Equipment */

2025-09-08T17:30:54Z

Pictures of Equipment

Clarkj25: /* Pictures of Materials */

2025-09-08T17:29:28Z

Pictures of Materials

Clarkj25 at 17:24, 8 September 2025

2025-09-08T17:24:58Z

Show changes

SchaeferS: /* Payment by Weight */ updated/correct link for 109.01B2 referencing 2020 spec book

2022-02-16T18:24:30Z

Payment by Weight: updated/correct link for 109.01B2 referencing 2020 spec book

SchaeferS: /* Payment by Weight */ updated/correct link for 302.03 referencing 2020 spec book

2022-02-16T18:21:09Z

Payment by Weight: updated/correct link for 302.03 referencing 2020 spec book

SchaeferS: /* MATERIALS */ updated/correct link for 902.05 referencing 2020 spec book

2022-02-16T18:14:51Z

MATERIALS: updated/correct link for 902.05 referencing 2020 spec book

@@ Line 129: / Line 129: @@
 After placement, the aggregate base layer will be compacted to a uniform thickness no less than 3 inches and no more than 8 inches. If less than 3 inches of material will be placed, the Contractor must blend the new material with the existing aggregate base so 6 inches of material will be compacted. The finished surface layer thickness will be shaped to within ±1/2-inch of the crown and the grade shown on the plans.
-[[File:302-007.jpg|300px]]
+{| class="wikitable"
 The Contractor should take care not to rut or distort the subbase material or the aggregate base during spreading/placing; the layer must remain smooth, compacted, and uncontaminated, especially after the grade has been booked. The required line, grade, and cross-section should be maintained until placement of the next layer. If any deformities occur, the Contractor must restore any subgrade, subbase, or aggregate base that is damaged. In the case of the aggregate base becoming contaminated, the contaminated area should be removed and replaced at no cost to the contract.

← Older revision		Revision as of 17:45, 8 September 2025
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 | [[File:Smooth drum roller.jpg|300px|thumb|center|'''Smooth Drum Roller''']] || [[File:302-005.jpg|300px|thumb|center|'''Grader''']]
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-| [[File:302-002.jpg|300px|thumb|center|'''Auto Trimmer Equipped with AMG''']] || [[File:302-003.jpg|300px|thumb|center|'''Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade''']]
+| [[File:Laser transit.jpg|300px|thumb|center|'''Laser Transit''']]
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-Laser transit.jpg|''Laser Transit''
+|''''
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 {| class="wikitable"
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 | [[File:302-002.jpg|300px|thumb|center|'''Auto Trimmer Equipped with AMG''']] || [[File:302-003.jpg|300px|thumb|center|'''Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade''']]
@@ Line 98: / Line 102: @@
 |''''
 |''''
-Smooth drum roller.jpg|''Smooth Drum Roller''
+|''''
--005.jpg|''Grader''
+|''''
 Laser transit.jpg|''Laser Transit''
 </gallery>

@@ Line 84: / Line 84: @@
 === Pictures of Equipment ===
 <gallery>
--002.jpg|''Auto Trimmer Equipped with AMG''
+|''''
--003.jpg|''Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade''
+|''''
 Smooth drum roller.jpg|''Smooth Drum Roller''
 -005.jpg|''Grader''

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 === Pictures of Materials ===
-[[File:208-2-2-3.jpg|300px]]
+{| class="wikitable"
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 ===[[#Payment by Weight|Payment by Weight]]===
-When payment is by weight, refer to weighing material and mixtures in subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/109%20Measurement%20&%20Payment.pdf 109.01] and Section [https://www.michigan.gov/documents/mdot/MDOT_2020_Construction_Specifications_Book_WEB_728364_7.pdf#page=180 302.03] of the Standard Specifications for Construction.  Aggregate will be weighed to the nearest 100 pounds (50 kg).  Pay weights will be the scale weight of the aggregate unless the moisture content is more than 6 percent.  Moisture tests will be made at the start of weighing operations and at any time thereafter to determine any change in moisture content.  The adjustment to the pay weight will be according to the following formula:
+When payment is by weight, refer to weighing material and mixtures in subsection [https://www.michigan.gov/documents/mdot/MDOT_2020_Construction_Specifications_Book_WEB_728364_7.pdf#page=109 109.01B2] and Section [https://www.michigan.gov/documents/mdot/MDOT_2020_Construction_Specifications_Book_WEB_728364_7.pdf#page=180 302.03] of the Standard Specifications for Construction.  Aggregate will be weighed to the nearest 100 pounds (50 kg).  Pay weights will be the scale weight of the aggregate unless the moisture content is more than 6 percent.  Moisture tests will be made at the start of weighing operations and at any time thereafter to determine any change in moisture content.  The adjustment to the pay weight will be according to the following formula:
 '''''Pay Weight = Weight of wet aggregate x (100 + allowable % of moisture) / (100 + actual % of moisture)'''''

@@ Line 14: / Line 14: @@
 ==[[#MATERIALS|MATERIALS]]==
-Aggregates from dense graded series 21AA, 21A and 22A will be used for aggregate bases as per subsection [http://mdotcf.state.mi.us/public/specbook/files/2012/902%20Aggregate.pdf 902.06] of the Standard Specifications for Construction.  22A is to be used under areas that will be surfaced with Hot Mix Asphalt (HMA) surfaces such as mainline, shoulders and approaches (23A is not to be used for this work).
+Aggregates from dense graded series 21AA, 21A and 22A will be used for aggregate bases as per subsection [https://www.michigan.gov/documents/mdot/MDOT_2020_Construction_Specifications_Book_WEB_728364_7.pdf#page=821 902.05] of the Standard Specifications for Construction.  22A is to be used under areas that will be surfaced with Hot Mix Asphalt (HMA) surfaces such as mainline, shoulders and approaches (23A is not to be used for this work).
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