![]() The resident engineer should ensure that the minimum overlay thickness is at the plan thickness.ĭebonding Material (Sec 506.20.2.1) This debonding material also helps control heat between the base surface and the unbonded overlay.Click here to view the first two pages of this publication - pdf file format Description ![]() This information should include centerline and edgeline elevations at intervals acceptable to the resident engineer. The contractor should provide enough information to establish the initial and final roadway profile in order to calculate this quantity. Additional measurements should be taken if the inspector has reason to believe that the pavement is deficient in thickness.ĥ06.2.2 Portland Cement Concrete Unbonded Overlay (for Sec 506.20) 506.2.2.1 Description (for Sec 506.20.1)īecause of the field established plan quantity requirement, Contractor Furnished Staking should be set up in the contract. (Sec 506.10.5.3.1) Measurements for pavement thickness should be taken at random locations at approximately 200 ft. Pavement Thickness Determination (for Sec 506.10.5.3) See Sampling 506.2.1.3 Method of Measurement (for Sec 506.10.5) Representative samples may need to be sent to Construction and Materials for laboratory testing.ĥ06.2.1.2 Construction Requirements (for Sec 506.10.4) The contractor shall submit a mix design to District Materials for review and approval. of existing asphalt remains over the existing concrete, the pay item for surface preparation should be included and no bituminous interlayer is necessary.ĥ06.2 Construction Inspection (for Sec 506) 506.2.1 Ultrathin Concrete Whitetopping (for Sec 506.10) 506.2.1.1 Mix Design (for Sec 506.10.3) If existing asphalt is partially removed and at least 2 in. If existing asphalt overlays are being removed, a pay item should be included for a bituminous base and pavement bituminous interlayer 1 in. The designer may want to review records of past projects to determine typical quantities greater than the overlay thickness. It is recommended the field check include establishment of a profile line for estimation of concrete material quantity needed. This will require the designer to estimate what these quantities are during the field check, to avoid an overrun in project cost. The plan quantity included in the contract should account for the additional concrete material in excess of the specified overlay thickness. This quantity will be the field established plan quantity and will be paid for at the contract unit price for unbonded concrete overlay. The cubic yards of concrete required will be determined by the resident engineer from the set or adjusted profile. The profiles are determined in order to account for existing undulations in the pavement and to re-establish a smooth profile, not to re-establish the vertical alignment grade control points. The resident engineer may adjust the final profile as needed. For alternate bid projects, this pay item should be included in Section 1 to apply to both the asphalt and concrete overlay alternates.ĭuring construction, the contractor establishes the existing roadway profile and sets the final overlay profile. For this reason the bid item for contractor staking should be included in the contract. In specifications for unbonded concrete overlays, there are provisions that require the contractor to establish the existing roadway profile and set the final overlay profile.
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