302 - Aggregate Base Courses - Revision history

Jhudson-fishbeck at 17:31, 15 October 2025

2025-10-15T17:31:55Z

Jhudson-fishbeck: /* Description of Materials */

2025-10-15T16:39:58Z

Description of Materials

Jhudson-fishbeck: /* CONSTRUCTION */

2025-10-15T16:31:56Z

CONSTRUCTION

Jhudson-fishbeck: /* Pictures of Equipment */

2025-10-15T16:31:40Z

Pictures of Equipment

Jhudson-fishbeck: /* Pictures of Materials */

2025-10-15T16:30:01Z

Pictures of Materials

Jhudson-fishbeck at 18:56, 13 October 2025

2025-10-13T18:56:01Z

Clarkj25 at 17:49, 8 September 2025

2025-09-08T17:49:04Z

Clarkj25 at 13:35, 21 August 2025

2025-08-21T13:35:11Z

Jhudson-fishbeck: /* CONSTRUCTION */

2025-08-18T20:23:45Z

CONSTRUCTION

Jhudson-fishbeck: /* Pictures of Equipment */

2025-08-18T20:21:28Z

Pictures of Equipment

@@ Line 62: / Line 62: @@
 |+
 |-
-| [[File:208-2-2-3.jpg|200px|thumb|center|21AA Material]]
+| [[File:208-2-2-3.jpg|200px|thumb|center|'''21AA Material''']]
 |-
 |}
@@ Line 87: / Line 87: @@
 |+
 |-
-| [[File:302-002.jpg|200px|thumb|center|Auto Trimmer Equipped with AMG]] || [[File:302-003.jpg|200px|thumb|center|Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade]]
+| [[File:302-002.jpg|200px|thumb|center|'''Auto Trimmer Equipped with AMG''']] || [[File:302-003.jpg|200px|thumb|center|'''Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade''']]
 |-
-| [[File:Smooth drum roller.jpg|200px|thumb|center|Smooth Drum Roller]] || [[File:302-005.jpg|200px|thumb|center|Grader]]
+| [[File:Smooth drum roller.jpg|200px|thumb|center|'''Smooth Drum Roller''']] || [[File:302-005.jpg|200px|thumb|center|'''Grader''']]
 |-
-| [[File:Laser transit.jpg|200px|thumb|center|Laser Transit]]
+| [[File:Laser transit.jpg|200px|thumb|center|'''Laser Transit''']]
 |-
 |}
@@ Line 132: / Line 132: @@
 |+
 |-
-| [[File:302-007.jpg|200px|thumb|center|Aggregate Base Course Installation on a Sand Subbase]]
+| [[File:302-007.jpg|200px|thumb|center|'''Aggregate Base Course Installation on a Sand Subbase''']]
 |-
 |}

@@ Line 46: / Line 46: @@
 === Description of Materials ===
-Section 902 of the Standard Specifications for Construction. Aggregate base courses in Michigan typically consists of:
+[https://mdotwiki.state.mi.us/images_construction/9/95/2020-Standard-Specifications-Construction.pdf#page=816 Section 902 of the Standard Specifications for Construction]. Aggregate base courses in Michigan typically consists of:
 * Natural Aggregate: Limestone, basalt, granite, etc.
 * Recycled concrete

@@ Line 132: / Line 132: @@
 |+
 |-
-| [[File:302-007.jpg|200px|thumb|center|'''Aggregate Base Course Installation on a Sand Subbase''']]
+| [[File:302-007.jpg|200px|thumb|center|Aggregate Base Course Installation on a Sand Subbase]]
 |-
 |}
@@ Line 139: / Line 139: @@
 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.
 Final grading is performed using a trimmer, grader, or bulldozer generally equipped with AMG.  Material that is trimmed during final grading needs to be stockpiled and retested for gradation before it can be placed again.
 The Contractor should perform the necessary compaction to meet the density requirements of the aggregate base course. If density testing continually fails due to a low moisture content, the Contractor is allowed to use a water truck to increase the moisture content of the aggregate up to, but not above, the optimum moisture content. A moisture content closer to optimum may improve the ability to obtain density. A change in rolling pattern or equipment are other means the Contractor can use to achieve density.
 If concrete or HMA trucks are allowed on the aggregate base course during pavement installation, it should only be to back onto the grade from the haul road, unload, and get back off the grade. Where possible, truck paths should be varied so as not to overlap. Do not use the finished grade as a haul road for empty trucks.

@@ Line 87: / Line 87: @@
 |+
 |-
-| [[File:302-002.jpg|200px|thumb|center|'''Auto Trimmer Equipped with AMG''']] || [[File:302-003.jpg|200px|thumb|center|'''Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade''']]
+| [[File:302-002.jpg|200px|thumb|center|Auto Trimmer Equipped with AMG]] || [[File:302-003.jpg|200px|thumb|center|Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade]]
 |-
-| [[File:Smooth drum roller.jpg|200px|thumb|center|'''Smooth Drum Roller''']] || [[File:302-005.jpg|200px|thumb|center|'''Grader''']]
+| [[File:Smooth drum roller.jpg|200px|thumb|center|Smooth Drum Roller]] || [[File:302-005.jpg|200px|thumb|center|Grader]]
 |-
-| [[File:Laser transit.jpg|200px|thumb|center|'''Laser Transit''']]
+| [[File:Laser transit.jpg|200px|thumb|center|Laser Transit]]
 |-
 |}

@@ Line 62: / Line 62: @@
 |+
 |-
-| [[File:208-2-2-3.jpg|200px|thumb|center|'''21AA Material''']]
+| [[File:208-2-2-3.jpg|200px|thumb|center|21AA Material]]
 |-
 |}

@@ Line 59: / Line 59: @@
 === Pictures of Materials ===
-{| class="wikitable"
+{|
 |+
 |-
-| [[File:208-2-2-3.jpg|300px|thumb|center|'''21AA Material''']]
+| [[File:208-2-2-3.jpg|200px|thumb|center|'''21AA Material''']]
 |-
 |}
@@ Line 84: / Line 84: @@
 === Pictures of Equipment ===
-{| class="wikitable"
+{|
 |+
 |-
-| [[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:302-002.jpg|200px|thumb|center|'''Auto Trimmer Equipped with AMG''']] || [[File:302-003.jpg|200px|thumb|center|'''Bulldozer with Equipped AMG Placing Aggregate Base on Subgrade''']]
 |-
-| [[File:Smooth drum roller.jpg|300px|thumb|center|'''Smooth Drum Roller''']] || [[File:302-005.jpg|300px|thumb|center|'''Grader''']]
+| [[File:Smooth drum roller.jpg|200px|thumb|center|'''Smooth Drum Roller''']] || [[File:302-005.jpg|200px|thumb|center|'''Grader''']]
 |-
-| [[File:Laser transit.jpg|300px|thumb|center|'''Laser Transit''']]
+| [[File:Laser transit.jpg|200px|thumb|center|'''Laser Transit''']]
 |-
 |}
@@ 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.
-{| class="wikitable"
+{|
 |+
 |-
-| [[File:302-007.jpg|300px|thumb|center|'''Aggregate Base Course Installation on a Sand Subbase''']]
+| [[File:302-007.jpg|200px|thumb|center|'''Aggregate Base Course Installation on a Sand Subbase''']]
 |-
 |}

@@ Line 59: / Line 59: @@
 === Pictures of Materials ===
-[[File:208-2-2-3.jpg|300px]]
+{| class="wikitable"
 {{top}}
@@ Line 80: / Line 84: @@
 === Pictures of Equipment ===
-<gallery>
+{| class="wikitable"
--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''
+| [[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''']]
--005.jpg|''Grader''
+|-
-Laser transit.jpg|''Laser Transit''
+| [[File:Smooth drum roller.jpg|300px|thumb|center|'''Smooth Drum Roller''']] || [[File:302-005.jpg|300px|thumb|center|'''Grader''']]
-</gallery>
+|-
 {{top}}
@@ Line 120: / 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.

@@ Line 4: / Line 4: @@
 <center><span STYLE="font: 40pt arial;">'''Aggregate Base Course'''</span></center>
@@ Line 224: / Line 223: @@
 [[Category:Division 3]]
 [[Category:Section 302]]

← Older revision		Revision as of 20:23, 18 August 2025
Line 121:		Line 121:
	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.		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]]
		+
		+	''Aggregate Base Course Installation on a Sand Subbase''

	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.		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.