Wisconsin WisDOT Standard Specifications (within FDM) — Section 350

Effective with the December 2018 Letting 138 2019 Standard Spec ifications Section 350 Subbase

350.1Description

(1)This section describes constru cting a granular subbase on the prepared subgrade.

350.2Materials

(1)Conform to 209.2 for granular backfill, except ensure that the maximum dimensio n of a particle does

not exceed 3/4 of the compacted thickness of any individual layer being placed.

(2)Procure material as specified in 209.2.4 from one or both of t he following sources:

- Within the right-of-way as the plans show or as allowed in 104.8 . - Beyond the right-of-way as specified for borrow in 208.3 .

350.3Construction

350.3.1 General

(1)Do not place loam, clay, silt, o r similar soil materials on the subbase surface or incorporate into the

subbase. With the engineer's approval, the contra ctor may use c ement, fly ash, lime, or similar engineer-approved materials to stabilize the subbase.

(2)If the contract speci fies both a subbase and a flexible base, and constructing the subbase in multiple

layers, construct successive layers in the sequence and at the times the engineer directs. The engineer will phase that construction to provide a usable surface for traffic. 350.3.2 Preparing Subgrade

(1)Prepare and maintain the subgrade as specified for preparing t he foundation for non-rigid base under

211. Excavate and backf ill areas of soft, yielding, or spongy subg rade or otherwise treat unstable areas as the engineer directs. 350.3.3 Constructing Subbase

(1)Place granular subbase on the prepared subgrade in a way that minimizes contamination with the

subgrade material. Do not places ubbase material on a frozen su bgrade, subgrade covered by ice or snow, or on a wet or soft subgrade unless the engineer specific ally directs.

(2)Compact the material as specified in 207.3.6 except conform to 301.3.1 for compaction equipment.

Follow the standard compacti on methods specified in 207.3.6.2 unless the contract requires the special compaction methods specified in 207.3.6.3 .

(3)Place, shape, and compact the s ubbase to the lines, grades, an d section the contract specifies.

Maintain the finished subbase unt il it is covered, or until the engineer accepts the work if the contract does not require covering the subbase.

350.4Measurement

350.4.1 General

(1)The department will measure the Su bbase bid items by the cubic yard, the ton, or the square yard

acceptably completed. 350.4.2 By Volume

(1)For material measured by the cubic yard, the department will c ompute the volume of material in its

original source position using one of the following methods: - Average end areas, with no correction for curvature. - Truncated prisms.

(2)The department will measure the or iginal volume after the cont ractor strips or otherwise prepares the

deposit. Notify the engineer before removing subbase material. The department will not measure material removed before the engineer measures the original volu me.

(3)For small quantities, the depar tment may elect to determine th e volume in the vehicle. The engineer

will determine the capacity of each vehicle used to the nearest 1/10 cubic yard. 350.4.3 By Weight

(1)For measurement by the ton, the department will determine weig ht based on contractor-provided

tickets submitted daily. Submit a ticket for each load showing the material, net weight, date, and project ID. For material with mor e than 7 percent moisture, the department will reduce the ticket weight by the weight of water exceeding 7 percent. The department will determine moisture content as a percent of dry weight.

Effective with the December 2018 Letting 139 2019 Standard Spec ifications 350.4.4 By Area

(1)For material measured by the square yard, the department will only measure areas placed to the

thickness the contract specifies or the engineer directs. For s ubbase with sloping sides, the department will compute area based on the mean width of the top and bottom of the layer. The department will measure additions ordered to correct for settlement of the earth subgrade based on the in place volume converted to an equivalent area.

350.5Payment

(1)The department will pay for measured quantities at the contrac t unit price under the following bid

items: ITEM NUMBER DESCRIPTION UNIT

350.0102 Subbase CY

04 Subbase TON

10 - 0199 Subbase (inch) SY

(2)Payment for the Subbase bid items is full compensation for pre paring the subgrade; for excavating,

loading, and hauling material from within the right-of-way or furnishing material as required from beyond the right-of-way; and for providing and maintaining the subbase.

(3)The department will pay separately for the items specified for borrow pits under 628.5.1 . Other costs

associated with the procurement of material from beyond the right-of-way are incidental to the Subbase bid items.

Effective with the December 2018 Letting 140 2019 Standard Spec ifications Section 390 Base Patching

390.1Description

(1)This section describes patching areas of existing concrete pav ement with either concrete or asphaltic

mixtures for overlaying with new pavement.

390.2Materials

(1)The contractor may use either c oncrete or asphaltic mixture.

(2)Furnish concrete conforming to the requirements specified for air-entrained high early strength

concrete, grade B, B-FA, B-S , B-IS, B-IP, or B-IT, under 501, except that under the Base Patching Concrete SHES bid item, furnish concrete as specified for SHES concrete repair and replacement in 416.2 . Provide QMP for class II ancillary concrete as specified in 716.

(3)Furnish asphaltic mixture as specified for asphaltic base unde r 315.2 .

(4)Furnish dowel bars and tie bars as the plans show and conformi ng to 505.2.6 .

390.3Construction 390.3.1 General

(1)Unless the contract provides otherwise, keep the road open to traffic during construction. If possible,

restrict operations to one lane at a time. Perform work to caus e the least possible inconvenience to traffic.

(2)Remove areas of existing concre te pavement, including existing patching or surfacing materials, at

locations the plans show or the engineer directs in the field. Saw the connecting edges as true and perpendicular as possible as specified for sawing pavement in 690. Remove the pavement without injury to the remaining pavement. D ispose of removed material a s specified in 204.3.1.3 .

(3)Prepare the foundation as specified in 211 using engineer-approved hand me thods. Place the patch to

the thickness of the contiguous pavement, including the existin g asphaltic pavement or surfacing. 390.3.2 Concrete Patching

(1)Deposit concrete to require as little rehandling as possible, place and consolidate by hand, and strike

off and finish flush with adjoining surfaces. The engineer will not require forms un less necessary to provide the required edge, grade, or alignment.

(2)Cure exposed patches as specif ied for concrete pavement in 415.3.12. Use wax-based curing

compound conforming to 501.2.9 . Protect as specified for concrete pavement in 415.3.14 . Open to traffic as specified for concrete base in 320.3 . 390.3.3 Asphaltic Patching

(1)Construct as specified for asphaltic base under 315 except as modified here in 390.3.3.

(2)Dump material outside the patch area, fill the patch in succes sive layers with shovels, and shape to

the required grade and contour wit h rakes and lutes. Do not rak e dumped material into the patch. The engineer will not require forms unless necessary to provide the required edge, grade, or alignment.

(3)Compact each layer with engineer-approved compaction equipment . Unless the engineer directs

otherwise, compact each layer to a thickness of 6 inches or less. Roll the top layer until flush with the adjacent surface.

(4)Do not open patches to traffic until they are hard enough to p revent rutting or displacement.

390.3.4 Special High Early Strength Concrete Patching

(1)Construct as specified for sp ecial high early strength repairs under 416.3.8 except as follows:

- The contractor may delay removal for up to 14 calendar days after cutting the existing pavement. - Open to traffic as specified for concrete base in 320.3 .

(2)Cure exposed patches as specif ied for concrete pavement in 415.3.12. Use wax-based curing

compound conforming to 501.2.9 . Do not apply excess curing com pound that could cause slippery pavement under traffic.

390.4Measurement

(1)The department will measure Base Patching Asphaltic by the ton or square yard acceptably

completed.

(2)The department will measure Base P atching, Base Patching Concr ete, and Base Patching Concrete

SHES by the square yard acceptably completed.

Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 147–148 of 601.

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340 Cracked and Seated Pavement

390 Base Patching