3-26 Section 307. Aggregate Shoulders and Approaches
307.01 Description
This work consists of constructing aggregate shoulders and approaches on a prepared subgrade or existing aggregate surface.
307.02 Materials
Provide material in accordance with the following sections : Dense-Graded Aggregate 21A, 21AA, 22A, 23A, 23AA ........................ 902 Salvaged Aggregate .............................................................................. 902 Provide the following aggregate grades for the class of shoulders and approaches required by the contract:
A.For Class I, provide Dense-Graded Aggregate 22A ;
B.For Class I requiring a paved surface, provide Dense-Graded Aggregate 21A, 21AA or 22A ;
C.For Class II, provide Dense-Graded Aggregate 23A or 23AA ;
D.For Class III, provide salvaged aggregate, Dense-Graded Aggregate 23A or 23AA ; and
E.For Class IV shoulders, provide existing shoulder m aterial. For salvaged materials, provide Engineer -approved salvaged aggregate or other material from existing roads or stockpile. Remove particles larger than 2 inches from borrow or salvaged materials and dispose of in accordance with subsection 205.03.P.
307.03 Construction
A.Trenching . Excavate, shape, and compact trenches to the width and depth required. For trenches under HMA, compact the bottom of the trench to at least 98% of the maximum unit weight at no greater than optimum moisture content. Compact the bot tom of other trenches to 95% of the maximum unit weight. The Engineer may allow 95 % if 98% of maximum unit weight cannot be achieved. Take ownership of trenched material and dispose of in accordance with subsection 205.03.P at no additional cost to the Department. Place and maintain traffic control devices in accordance with section 812 in shoulder areas that cannot be backfilled and compacted the same day. Bring shoulder material flush with existing pavement the next day or as directed by the Engineer. MDOT Standard Specifications for Construction Section 307 3-27 B. Constructing Shoulders and Approaches . Provide a ticket with each load stating the following information:
1.Project number ;
2.Aggregate source;
3.Aggregate series ;
4.Date;
5.Time ;
6.Truck identifier number ;
7.Supplier name; and
8.Type of aggregate approval . If the contract requires payment by weight, ensure the ticket includes the gross weight, tare weight, and net weight to the nearest 100 pounds. Determine the truck tare weight at least once daily. If the contract does not require payment by weight, the Engineer may accept written documentation instead of tickets. Written documentation must identify the pay item of the material and include all of the information listed above except time and truck identifier number. Provide aggregate with a uniform gradation, free of contamination and segregation when placed. Do not place aggregate shoulder and approach material on frozen, soft, unstable, or rutted subgrade; subbase; or aggregate base. The Contractor may use additives to facilitate compaction, shaping, and maintenance. If placing aggregate shoulder or approach material in a layer less than 3 inches, scarify with 2 inches of the layer below. Do not rut or distort the subbase material or aggregate base during spreading. Place and compact material without damaging adjacent paved surfaces. Maintain aggregate material in a smooth, stable condition and provide dust control. Maintain compacted aggregate flush with each layer of placed HMA. Grade aggregate material to provide positive drainage off the shoulder.
C.Density Requirements. Meet the following density requirements:
1.Class I Shoulders and Approaches . Compact Class I shoulders and approaches to at least 98% of the maximum unit weight at no greater than optimum moisture content ; MDOT Standard Specifications for Construction Section 307 3-28 2. Class II and Class III Shoulders and Approaches. Compact Class II and Class III shoulders and approaches to at least 95% of the maximum unit weight at no greater than optimum moisture content, except for layers 3 inches or less ; and
3.Class IV Shoulders. Compact Class IV shoulders to at least 95% of the maximum unit weight at no greater than optimum moisture content, except for layers 3 inches or less.
D.Surplus or Unsuitable Aggregate Material . The Contractor may use surplus or unsuitable aggregate in fills in accordance with section 205. Take ownership and dispose of unused material in accordance with subsection 205.03.P at no additional cost to the Department.
307.04 Measurement and Payment
Pay Item Pay Unit Trenching ............................................................................................... Station Shld, Cl __ ................................................................................................... Ton Shld, Cl __, LM ................................................................................ Cubic Yard Shld, Cl __, CIP ............................................................................... Cubic Yard Shld, Cl __, __ inch ........................................................................ Square Yard Approach, Cl __ ........................................................................................... Ton Approach, Cl __, LM ........................................................................ Cubic Yard Approach, Cl __, CIP ....................................................................... Cubic Yard Approach, Cl __, __ inch ............................................................... Square Yard
A.Trenching . The Engineer will measure Trenching along each pavement edge. The unit price for Trenching includes the cost of trenched aggregate reused in shoulders or approaches that does not require loading and hauling. The Engineer will measure Shld, Cl III, LM and Appr oach, Cl III, LM at the final point of delivery. The Department will pay for trenched aggregate that is reused in shoulders or approaches and that requires loading and hauling as Shld, Cl III, LM and Approach, Cl III, LM. The Engineer will measure, and the Department will pay for , trenched aggregate that is reused in fills as Embankment in accordance with subsection 205.04.
B.Shoulder and Approach . If the contract requires the Engineer to measure shoulder or approach contract items by weight, the Engineer will use the scale weight, including additives, unless the moisture content is greater than 8 %. The Engineer will perform moisture tests at the start of MDOT Standard Specifications for Construction Section 307 3-29 weighing operations and if construction operations, weather conditions, or other causes may change the moisture content. If tests indicate a moisture content greater than 8% , the Engineer will deduct the weight of the excess moisture from the scale weight of the aggregate until moisture tests indicate the moisture content is no greater than 8 %. The Engineer will determine the aggregate moisture content and pay weights in accordance with section 109. If the contract requires the Engineer to measure shoulder or approach contract items by area, the Engineer will t ake longitudinal measurement s parallel to the center line. The Engineer will use the transverse dimensions shown on the plans. If the contract requires the Engineer to measure shoulder or approach contract items by volume in place, t he Engineer will use the lines and dimensions shown on the pla ns to measure volumes, compacted in place. The Engineer will measure shoulder or approach LM pay items based on hauling unit dimensions and load count before placement and compaction. The unit prices for shoulder and approach LM pay items include the cost of providing, hauling, placing, compacting, and grading the material.
C.Water. The cost to provide and apply water to facilitate placement or compaction is included in the unit prices for related items of work.
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Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 201–204 of 1,146. View official source ↗