00759.00 840 Section 00759 - Miscellaneous Portl and Cement Concrete Structures
Description
00759.00Scope - This Work consists of furnishing, placing and finishing Commercial Grade
Concrete curbs, concrete curb ramps with curbs, islands, traffic separators, driveways, side walks, monolithic curb and sidewalks, miscellaneous surfaces, and stairs in close conformity to the lines, grades and dimensions shown or established. This Work consists of furnishing, placing and finishing concrete bus pads according to Section 00756.
The Commercial Grade Concrete items in this Section will be collectively referred to as " Structures".
00759.02Definitions :
Pedestrian Access Routes - An area for the use of pedestrians to navigate along sidewalks, driveways, curb ramps, crossings, and pedestrian facilities.
00759.0 3 Required Submittals - Material ordered or Work performed before the Engineer reviews and returns the documents shall be at the Contractor's risk. Submit the following:
curb ramp Work, submit the names, telephone numbers, and copies of the ODOT ADA Certification for Contractors at least 10 Calendar Days before the preplacement conference.
the Work has been approved. At least 21 Calendar Days before the curb ramp Work is scheduled to begin, submit a plan for accomplishing all phases of the cur b ramp Work , including but not limited to the following (also see 00180.41) :
Surface preparation Compliance with Working Drawings and details submitted under 00759.03( c) Compliance with current Standard Drawings and Plans Waste handling and disposal
or more curb ramp location(s), not to exceed 32 ramps unless otherwise approved under 00180.41, submit unstamped Working Drawings according to 00150.35. Include field verification of each ramp site, and all dimensions , slopes and grades necessary to demonstrate compliance with the Standard Drawings and Plans. Marked up Supplemental Drawings, if field verified, may be submitted as Working Drawings. Notify the Engineer of any deficiencies or noncompliance with the Standard Drawings or Plans. The Engineer will provide additional or modified Plans as needed. Do not begin Work at a curb ramp until submittals for that curb ramp have been received, reviewed, and accepted in writing by the Engineer.
After submittal of the unstamped Working Drawings, according to 00150.35 a site visit may be requested by the Contractor or Engineer. The site visit will include a review of any field markings and discuss the submitted unstamped Working Drawings. The Engineer will provide additional or modified information, as needed.
Include the following in the Working Drawings:
00759.10 841 Verification of elevations, slopes, grades and dimensions necessary to demonstrate compliance w ith the Standard Drawings and Supplemental Drawings. Verification of potential utility conflicts or other street furnishings that may require relocation or adjustment. Identification of infeasibilities or constructability issues with the Standard Drawings and Supplemental drawings.
corrective action. Include TPAR necessary to complete corrective action work.
At least 21 Calendar Days before concrete Structures Work is scheduled to begin, submit a corrective action plan. The corrective action plan shall address procedures to correct deficient Structures through minor corrective action or replacement according to 00759.55(a), and include:
List of minor correctiv e actions that will be used to correct deficiencies, according to 00759.50 and 00759.55. Procedures for performing corrective action. Proposed concrete grinding Equipment and method of grinding. Proposed concrete repair Material used for resurfacing ground concrete surfaces according to Section 02015. Construction activities, Equipment and staging necessary to complete corrective action Work. The Engineer will review the corrective action plan(s) and provide a response to the Contractor within 5 Days after receiving the plan. Do not begin concrete Structure Work until the corrective action plan is approved by the Engineer.
00759.04Preplacement Conference - Before beginning any curb ramp Work , meet with the
Contractor's ODOT ADA Certified supervisory personnel and any quality control personnel if applicable, any curb ramp Subcontractors' supervisory personnel, and the Engineer at a mutually agreed upon time.
If the Contractor's personnel change, or if the Contractor proposes a significant revision to the plan for accomplishing the curb ramp Work , the Engineer may require additional preplacement conferences. If the Contractor’s schedule of work identifies multiple groups of curb ramp construction, as allowed by 00180.41, additional preplacement conferences may be required for each ramp group, at a mutually agreed upon time before Work begins. All supervisory personnel who have an active ODOT ADA Certification for Contractors and directly supervise the curb ramp Work are required to attend the preplacement conference.
Materials
00759.10Materials - Furnish Materials meeting the following requirements:
Dowels .................................................................................................. 02510.50 Preformed Expansion Joint Filler .......................................................... 02440.10 Welded Wire Fabric ............................................................................... 02510.40
Furnish Class 4000 - 1 1/2 paving concrete for bus pads. 00759.11 842
00759.11Aggregate Base - Furnish Aggregate Base Materials for Base , foundation courses,
Leveling courses, or bedding meeting the requirements of Section 02630. If a designated size is not shown or given, furnish either 1" - 0 or 3/4" - 0, as the C ontractor elects.
00759.12Curb Ramp Treatment - Furnish truncated dome detectable warning surfaces for curb
ramps and accessible route islands from the QPL. Furnish truncated dome detectable warning surfaces that are safety yellow in color on or along State Highways.
Use only adhesives recommended or supplied by the manufacturer.
Equipment
00759.21Concrete Extruding Machine - Concrete extruding machines shall operate under
sufficient restraint to forward motion to produce a well consolidated mass of concrete.
00759.22Smart Level - Use ODOT approved smart level devices to measure cross slopes and curb
ramp slopes. Calibrate smartle vels at the time of inspection. Use percentage mode to record all slope measurements to the nearest tenth of a percent relative to a true horizontal plane (zero).
model 92379 or model 92500, and a 6 inch SmartTool level model 92346.
00759.23Concrete Resurfacing Equipment - Furnish power -operated scarifying Equipment
capable of uniformly removing and preparing the existing surface to depths required. For concrete grinding operations, furnish 12 segment grinders, fine-toothed scarifying Equipment, or other approved grinding Equipment.
Labor
00759.30Personnel Qualifications - Use supervisory personnel who have an active ODOT ADA
Certification for Contract ors to directly supervise the curb ramp Work. Provide onsite supervisory personnel that are ODOT ADA Certified during construction of the curb ramps.
Construction
00759.41Earthwork - Make excavations and backfills for the Structures according to Section 00330
and to the depths, widths, and Cross Sections shown, specified, or directed.
Remove and dispose of existing concrete sidewalks, curbs, and curb ramps that are scheduled for removal according to Section 00310.
00759.42Foundations - Construct foundations or other bedding using selected granular backfill
Material according to Section 00330 or using Aggregate Base when shown or directed. For Aggregate Base , do one of the following:
• When existing Aggregate Base Materials of the kind specified in 00759.11 are already in place, salvage and reuse. Use new Aggregate Base Materials conforming to 00759.11.
00759.43Foundation Preparation - Bring areas on which Structures are to be constructed to
estab lished line, and make firm, dry and free of all Unsuitable Material before placing concrete. Existing concrete surfaces shall be clean and moist at the time of placing new concrete.
00759.48 843 When placing concrete by the extrusion method, vertical dowel fastening to underlying concrete may be eliminated if the bond between surfaces is developed by applying epoxy bonding agent. Apply epoxy bonding agent according to the manufacturer's recommendations.
00759.44Joining New to Existing Concrete - Construct suitabl e connections between new and
existing concrete where existing driveways, walks, and other Structures are cut back to permit the new construction or where the new construction abuts the existing concrete. Unless shown or directed otherwise, furnish and pl ace minimum 3/4 inch thick preformed expansion joint filler between new and existing concrete.
00759.45Reinforcement, Dowels, and Tie Bars - Furnish and place reinforcement, dowels, and tie
bars according to 00755.43 and as shown or directed.
Provide dowels with "slip sleeves" and place as load transfer devices where shown. Place dowels without "slip sleeves" as fastenings or ties between new and existing underlying concrete when shown.
00759.46Concrete - Construct the Structures between suitable forms or by the extrusion method
Place concrete according to the Plans, Section 00440 , and this Section.
00759.48Expansion Joints - Construct expansion joints of the preformed filler type in concrete
Structures as shown and the following:
• Not less than 1/2 inch wide, except where abutting or underlying concrete joints are larger, then the width shall match those joints. • At right angles to the Structure alignment and normal to the Structure surface. • Which completely separate the concrete segments. • Placed f lush or no more than 1/8 inch below the concrete surface.
• Opposite abutting expansion joints in abutting concrete. • Over existing expansion joints in concrete underlying the new concr ete Structure . • At each point of tangency in the Structure alignment. • Not over 200 foot spacing.
expansion joints within the curb ramp, and between separate concrete pours on the same P roject.
Provide expansion joints:
• Between driveways and concrete Pavement . • Transversely in walks opposite expansion joints in adjoining curbs and elsew here so the distance between joints does not exceed 45 feet. • Transversely in walks at a distance of 16 feet to 8 feet from ends of walks which abut curbs. • Around poles, posts, boxes, and other fixtures which protrude through or against the Structures.
00759.49 844 00759.49 Contraction Joints - Construct transverse contraction j oints of the weakened plane or dummy type in the exposed surfaces of the concrete Structures as shown and the following:
• Over contraction joints in concrete underlying the new concrete Structure . • Opposite contr action joints in abutting concrete. • At locations to confine joint spacing to a maximum of 15 feet. For bus pads, where shown.
• Inserting and removing plates, or other devices. • Inserting and leaving in place preformed expansion joint filler even and flush with the concrete surface. • Sawing as soon as practicable after concrete placement but before any uncontrolled cracking occurs. • Tooling. • Other approved methods.
• Be not less than 1/8 inch or more than 1/4 inch wide. • Be a depth of one-third the thickness of the concrete. • Have clean, unfilled grooves (if preformed expansion joint filler is not used).
00759.50Surface Finishing :
while the concrete is still green. Repair mi nor defects with mortar containing one part portland cement and two parts Sand. Do not plaster exposed surfaces.
The top and face of Structures shall be true and straight, free from humps, sags, or other irregularities. The surface shall not vary more t han 1/4 inch from the edge of 12 foot long straightedge laid on the top or face of the Structure , except in curves. Furnish the straightedge and operate it as directed. Unless otherwise shown or directed, tool edges to 1/4 inch radius. Install truncated domes as shown. Place according to the manufacturer's recommendation. Install abutting truncated dome panels with no more than 1/4 inch spacing. Install anchors along cut edges of truncated dome panels according to manufacturer's recommendations.
In addition, finish concrete surfaces of Structures to be within the established Slopes and dimensions allowed by the Standard Drawings and Plans. Repair or remove and replace Structures not meeting the Standard Drawings and Plans at no additional cost to the Agency.
required to produce a smooth surface and uniform texture.
Strike -off the concrete to the grade shown, and float the surface smooth. After the water sheen disappears, edge the joints and remove edging tool marks prior to final finishing. Lightly cross - broom the surface to a uniform texture. D o not trowel joints or edges after brooming surface. 00759.55 845 The 24- inch smart level will be used to measure driveway and sidewalk cross slopes on the pedestrian access route.
to the grade shown and float the surface smooth. After the water sheen disappears, edge the joints and remove edging tool marks prior to final finishing. Lightly cross -broom the surface to a uniform texture. Do not trowel joints or edges after brooming surface.
The 6 inch smart level will be used to measure curb running slope. The 6 inch smart level will be used to measure slopes on portions of the curb ramp, gutter pan, or adjacent surfaces that cannot accommodate a 24 inch smart level. All other curb ramp locations will use a 24 inch smart level to measure slopes.
00759.51Curing - Cure and protect concrete after placing and f inishing according to Section 00440
Keep the concrete Structure free from contact, strain and Public Traffic for at least 7 Calendar Days or longer as directed. Do not apply curing compounds to the designated truncated dome areas of curb ramps and acces sible route islands.
00759.53Welding - Welding, welder qualifications, prequalification of weld details and inspection of
welds shall conform to AWS D1.1. Submit all welding procedure specifications to the Engineer for approval.
00759.54Bolt Holes :
than 1/16 inch. Ream any holes that are required to be enlarged to admit the anchor bolts. Make clean cut holes without torn or ragged edges.
multiple anchor plates are stacked with the edges even, a cylindrical pin 1/8 inch smaller in diameter than the nominal size of the punched hole may be entered perpendicular to the face of the plate without drifting in each of the connecting holes in the same plane. Non-conforming pieces will be rejected.
00759.55Correction of Deficient Structures - Unless otherwise approved, notify the Engineer
before performing corrective action. Correct deficiencies at no additional cost to the Agency. Perform corrective actions as directed, according to the approved corrective action plan, and according to the following:
Engineer for approval. Minor corrective action can be performed to correct a deficiency up to 1 square foot per panel. Corrective action exceeding one square foot per panel requires removal and replacement according to 00150.25. Perform minor corrective action according to the following:
Equipment meeting the requirements of 00759.23. Resurface all ground concrete surfaces according to 00759.55(a)(2).
00759.80 846 (2) Concrete Resurfacing - Resurfacing to correct low area deficiencies is limited to 3/16 inch depth. Existing concrete is to be at leas t 7 Days old prior to resurfacing. Resurface repair areas according to the following:
by panel control joints. Sawcut shall be 1/8 inch wide and 1/4 inch deeper than the edge of the repair area. Bevel inside edge of keyway at a 45 degree angle.
from 00759.23. After grinding, sandblast the surface of the repair area. Clean the surface using a low pressure washer, less than 5,000 psi.
Prior to resurfacing, ensure there is no ponding water on the surface.
QPL remarks to select an appropriate material based on allowable installation depths. Furnish resurfacer in a color that closely matches the color of surrounding concrete surfaces. Mask boundaries of the repair area. Use hand tools to work resurfacer into keyways and match existing grade at boundaries. Apply a light broom -finish to achieve non- slip surface.
manufacturer’s recommendation, whichever is more restrictive. Follow manufacturer’s recommendation for return to traffic time.
of 1 foot for each 1/4 inch of AC P removed.
acceptance will be based on the Engineer’s inspection and approval of the Structure.
Measurement
00759.80Measurement - The quantities of Structures constructed under this Section will be
measured according to the following:
• Volume Basis - Measurement will be limited to the Neat Lines of the finished Structure as shown or directed.
• Area Basis - Measurement will be the finished surface, limited to the Neat Lines shown or directed. Measurement of concrete walks will include the total area of concrete walk, including the area of concrete curb ramps within the footprint of the concrete walk.
When monolithic curb and sidewalks are measured on the area basis, measurement will include the total area of monolithic curb and sidewalk, including the area of concrete curb ramps within the footprint of the monolithic curb and sidewalk. Measurement of concrete islands will include the total area of concrete islands, including the area of concrete curb ramps within the footprint of the concrete islands.
When concrete curb ramp construction is not adjacent to concrete walk, monolithic curb and sidewalk, or concrete island Work, the area of the concrete curb ramp Work will be included in the measurement of concrete walks. 00759.90 847 • Length Basis - Measurement of concrete items will be along the face of the Structure , from end to end including curb tapers or depressed l engths at driveways and ramps. • Each Basis - Measurement will be by actual count. Extra for Curb Ramps will be counted for each instance of where a curb ramp crosses a curb at the transition between a pedestrian facility and a R oadway.
Payment
00759.90Payment - The accepted quantities of Structures will be paid for at the Contract unit price,
per unit of measurement, for the following items: Pay Item Unit of Measurement
In item (a) the type of curb will be inserted in the blank, if appropriate. Item (a) includes the curb runs constructed adjacent to the curb ramps.
Item (b) includes traffic separators. Items (c) and (d) include monolithic curb at driveway locations. Items (e) and (f) include the area of new concrete curb ramps within the footprint of the Concrete Walks or Monolithic Curb and Sidewalks .
Item (f) includes the curb runs constructed adjacent to the curb ramps.
In item (g), the specified thickness, or type, of concrete Surfacings will be inserted in the blank, if appropriate.
Item (h) includes pipe handrail. Item ( k) includes the additional W ork required to construct a curb ramp or replace an existing curb ramp . Payment for the area of the curb ramp will be made under the concrete walks Pay I tem. Item ( l) includes installation of truncated domes on a new concrete or asphalt surface.
Item ( m) includes installation of truncated domes on an existing concrete or asphalt surface.
00759.90 848 Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment , labor, and Incidentals necessary to complete the Work as specified.
When earthwork is included as separate Pay Items, pa yment will be made according to 00330.90 through 00330.94 as appropriate.
When earthwork is not included as separate Pay Items, no separate or additional payment will be made for earthwork. Aggregate will be paid for according to 00640.90 or 00641.90 as appropriate.
No separate or additional payment will be made for : curb Ramp Working Drawings curb Ramp Plan preplacement conference concrete form verification any necessary repair or removal and replacement of Structures providing supervisory personnel who have an active ODOT ADA Certification for Contractors to directly supervise the curb ramp Work developing corrective action plans