8-18 Section 806. Shared Use Paths
806.01 Description
This work consists of preparing grade and constructing a concrete or HMA shared use path.
806.02 Materials
Provide material in accordance with the following sections : HMA Mixture ......................................................................................... 501 Coarse Aggregate 21AA, 21A, 22A ....................................................... 902 Granular Material .................................................................................. 902 Concrete Curing Material ...................................................................... 903 Joint Filler .............................................................................................. 914 Concrete, Grade 3000 ........................................................................ 1004
806.03 Construction
Construct the shared use path as shown on the plans or as directed by the Engineer.
A.Equipment . Provide equipment in accordance wit h subsection 501.03.A and subsection 602.03.A, except as modified by the following:
1.Hauling Equipment . Avoid damaging the grade by limiting the size and weight of hauling units . Repair damage caused by use of oversized equipment at no additional cost to the Department.
2.Pavers. Use self -propelled pavers capable of extending in 1-foot increments and paving at least 8 feet wide. Use of an automated paver is not required. A spreader may be used to place HMA shared use paths adjacent to paved shoulders or curb i f the spreader can place shared use path pavement meeting the required tolerances. Construct concrete shared use paths using slip-form paving equipment or fixed forms with a Department -approved screed that can place shared use path pavement in accordance with the plans . If using fixed forms, use straight, full -depth forms free of warp and capable of resisting deformation during concrete placement.
3.Rollers . Use tandem, steel -wheeled rollers for compacting materials . The Engineer may allow alternate rollers . Repair damage caused by equipment at no additional cost to the Department . MDOT Standard Specifications for Construction Section 806 8-19 B. Preparation of Base. If the existing earth grade meets the requirements of the contract, c ompact, smooth, and trim as directed by the Engineer. If vegetative cover and root mat are present, remove to at least 2 inches deep and dispose of the material off the right -of-way in accordance with subsection 201.03.A.4. Compact, smooth, and trim the subgrade as directed by the Engineer. Maintain the moisture content of the subgrade to provide stable support for the paver and hauling units . Aerate, water, and compact to provide support, as approved by the Engineer. Prepare the specified grade to within a tolerance of ¾ inch of the required grade. Maintain the grade in a smooth and compacted condition until the aggregate surface course has been placed. Repair any rutting or other disturbance caused by the Contractor ’s operations prior to placing the aggregate surface course. Compact the grade in accordance with MDOT’s Density Testing and Inspection Manual . Use granular material for additional embankment . Use aggregate to treat unstable subgrade areas.
C.Placing and Compacting HMA Mixtures . Place HMA mixtures in layers no greater than 3 inches deep. Place HMA mixtures to produce a smooth, dense surface free of irregularities within ¼ inch of the required grade when checked with a 10-foot straightedge, excluding vertical curves.
D.Placing and Finishing Concrete . Place forms in accordance with subsection 602.03. Maintain a moist base when placing concrete. Do not place concrete on frozen layers or if the grade is unstable from excessive moisture . Place concrete pavement mixtures to produce a smooth, dense surface f ree of irregularities . Place the concrete to the required depth and finish in accordance with the MDOT Standard Plan R -28 series. At driveways with curb and gutter on the drive approach, provide a curb drop to allow an opening for the shared use path. Construct the curb drop in accordance with the MDOT Standard Plan R -28 series . Do not stamp, stencil, or in any way mark concrete with a company name, logo, or other such information.
E.Joints for Concrete
1.Transverse Plane-of -Weakness Joints. Space transvers e plane-of -weakness joints at 12-foot intervals . Saw the joint ⅛ inch wide and 1 inch deep or form the joint with a grooving tool . Use a 6-inch-wide grooving tool with a ⅛ -inch radius . Do not seal the joints. MDOT Standard Specifications for Construction Section 806 8-20 2. Transverse Expansion Joints. Space full -depth t ransverse expansion joints at 200-foot intervals . Install a ½ -inch-thick pre-molded joint filler ¼ inch below the surface of the concrete. Do not seal the joints.
F.Finish Grading. Blade or place embankment material against the exposed edge of the shared use path. Leave the path surface free draining. Restore the disturbed area by adding topsoil, roadside seeding and mulch, or sodding in accordance with section 816.
806.04 Measurement and Payment
Pay Item Pay Unit Shared use Path, Grading ......................................................................... Foot Shared use Path, Aggregate ........................................................................ Ton Shared use Path, Aggregate, LM ..................................................... Cubic Yard Shared use Path, HMA ................................................................................ Ton Shared use Path, Conc .................................................................. Square Yard
A.Shared use Path, Grading. The Engineer will measure Shared use Path, Grading in place along the centerline of the path and within the limits shown on the plans . The unit price for Shared use Path, Grading includes the cost of the following:
1.Excavation;
2.Compacting the grade;
3.Providing and compacting embankment;
4.Grading curb cuts for ramps and driveways;
5.Fine grading of constructed grades; and
6.Required brushing, tree trimming , and removing and disposing of excess material.
B.Shared use Path, Aggregate. The unit price for Shared use Path, Aggregate includes the cost of providing and placing the aggregate to treat areas of unstable subgrade, as determined by the Engineer.
C.Shared use Path, HMA . The Engineer will measure Shared use Path, HMA by the weight of HMA mixture used to build the path. The unit price for Shared use Path, HMA includes the cost of providing, placing, and compacting the HMA mixture.
D.Shared use Path, Concrete. Conduct concrete QC as specified in section 1003 . The Engineer will conduct QA as specified in section 1004 . The Department will pay for this work based on the QA results and this subsection. MDOT Standard Specifications for Construction Section 806 8-21 The Engineer will measure Shared use Path, Conc based on plan quantities in accordance with subsection 109.01.
E.Slope Restoration . Slope restoration will be paid for separately .
F.Curb Ramp s, Curb and Gutter Removal and Placement . The Department will pay separately for placement of curb ramps and removal of curb and gutter or other appurtenances, in accordance with subsection 204.04, and subsection 803.04.
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 579–582 of 1,146.