Effective with the December 2018 Letting 131 2019 Standard Spec ifications Section 320 Concrete Base
320.1 Description
1.This section describes construct ing a concrete base for overla ying with new pavement.
320.2 Materials
1.Furnish materials as specifi ed for concrete pavement under 415 except use grade B, B-FA, B-S, B-IS, B-IP, or B-IT concrete as specified in 501. Provide QMP for class II ancilla ry concrete as specified in 716.
320.3 Construction
320.3.1 General
1.Construct as specified for concrete pavement under 415 except as modified here in 320.3.
320.3.1 1 Consolidating, Finishing, and Curing
320.3.1 2 Opening Concrete to Traffic
1.Conform to the procedures and op ening criteria specified for g rade A concrete used in concrete pavement under 415.3.15. If the contractor prevents l oading within 6 inches of a free edge or an edge abutting aggregate: 1. The engineer will allow the contractor to open to traffic when the concrete reaches 2000 psi. 2. In the absence of compressive strength information, the eng ineer may allow the contractor to open to traffic after 3 equivalent curing days expire.
320.3.1 3 Thickness Tolerance
1.The engineer will not require the contractor to conform to the tolerance in pavement thickness provisions specified for concrete pavement under 415.3.16.
320.3.2 Concrete Base
320.3.2 1 General
1.Construct as a single layer on a prepared foundation to the th ickness the plans show. Prepare the foundation as specified in 211.
320.3.2 2 Joints
1.Provide transverse joints as t he plans show or the engineer directs.
2.Locate longitudinal joints as the plans show. If the plans do not show the joint locations, provide longitudinal joints on the centerline for 2-lane concrete base or at the edges of the traffic lanes parallel to the centerline of the roadway for multilane concrete base.
3.Construct longitudinal joint s as the plans show. If the plans do not show construction details, install 1/2-inch diameter or larger tie bars, 24 inches long or longer, at 3 foot spacing.
4.Saw, form, or tool contraction jo ints as specified for transve rse joints in concrete pavement under
415.3.7 .
320.4 Measurement
1.The department will measure the bid items under this section b y the square yard acceptably completed. The department will m easure fillets for widened sections or fillets at drain basins and similar locations if placed mono lithic with the concrete base. The department will no t deduct for fixtures located within the limits of the concrete base. 320.5 Payment
1.The department will pay for measured quantities at the contrac t unit price under the following bid items: ITEM NUMBER DESCRIPTION UNIT 320.0100 - 0199 Concrete Base (inch) SY 320.0300 - 0399 Concrete Base HES (inch) SY
2.Payment for bid items under this section is full compensation for providing curing, and protecting concrete; and for providing tie bars and dowel bars in unharden ed concrete. For tie bars and dowel bars provided in concrete not p laced under the contract, the department will pay sep arately under the Drilled Tie Bars and Drilled Dowe l Bars bid items as specified in 416.5 . Effective with the December 2018 Letting 132 2019 Standard Spec ifications (3) Payment for the Concrete Base an d Concrete Base HES bid items also includes preparing the foundation except, if the contract contains the Prepare Foundat ion for Concrete Base bid item, the department will pay separately fo r preparing the foundation und er 211.5 . Effective with the December 2018 Letting 133 2019 Standard Spec ifications Section 325 Pulverized and Re-laid Pavement
325.1 Description
1.This section describes full dept h in-place pulverizing of the existing asphaltic pavement along with a portion of the underlying base and relaying the pulverized mate rial to construct a new base.
325.2 (Vacant)
325.3 Construction
1.Pulverize the full depth of the existing asphaltic pavement un til 97 percent or more will pass the 2-inch sieve. Also pulverize the exis ting base to the depth the plans show and mix with the pulverized asphaltic pavement. Windrow mat erial as construction operations dictate.
2.Immediately after pulverizing, r elay the material with a paver , grader, or both a paver and grader.
3.If sufficient material is avail able at a given location, match the lines, grades, and cross slopes the plans show. If there is insuffici ent material at a given locati on, shape the available material to create a smooth profile and cross slope for a good ride. Eliminate local ized bumps, depressions, and ruts. Unless the engineer specifically directs, the contractor is not required to haul material from one location on the project to another.
4.Immediately after relaying, compact the re-laid material first with either a rubber tired roller or vibratory padfoot roller and second with a v ibratory steel roller. Add water, as required, both before and during compaction. Compact each layer to the extent required for stand ard compaction under 301.3 . Use compaction equipment as follows: 1. For a compacted lift of 6 inc hes or less, use equipment as specified in 301.3.1. 2. For a compacted lift from 6 to 8 inches, use a 12.5-ton or heavier vibratory padfoo t roller and an 8-ton or heavier vibratory steel roller. 3. For a compacted lift greater than 8 inches, split into lift s less than 8 inches and use the equipment specified for those lift thicknesses.
5.Perform each day's pulverize and relay operations to avoid leaving abrupt longitudinal differences between adjacent lanes. Repair surf ace damage caused by interve ning construction or public traffic immediately before paving as ne cessary to provide a good riding pavement.
325.4 Measurement
1.The department will measure Pulv erize and Relay by the square yard acceptably completed, measured using the centerline length and the width from outside to outside of completed base, but limited to the width the plans show or the engineer directs.
325.5 Payment
1.The department will pay for the measured quantity at the contr act unit price under the following bid item: ITEM NUMBER DESCRIPTION UNIT 325.0100 Pulverize and Relay SY
2.Payment is full compensation for pulverizing, windrowing, rela ying, adding water, shaping, and compacting. If the engineer require s hauling material from one location on the proj ect to another, the department will pay for that hauling as extra work.
3.Payment also includes water fo r compaction and dust control ex cept, if the contrac t contains the Water bid item, the department will pay s eparately for compaction and dust control water under 624.5 .
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Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 140–141 of 601. View official source ↗