- 654 - SECTION 733 -- BRIDGE DECK AND APPROACH SLAB SMOOTHNESS
733.01 Description
1.This Specification applies wh en a new bridge deck is constructed and when an existing deck is replaced. It also applies to bridge ramps when the ramp is an additional paved su rface bridging an obstruction. This Specification does not app ly to overlays of exis ting bridge decks or to bridges built on gravel roads.
2.This Specification estab lishes a standard for bridge deck and approach slab smoothness. It is intende d that the bridge deck placement operation and the approach slab placem ent operation produce a finished driving surface with a profile index no greater than 0.50 inch/100 feet (12 mm/30 m). The smoothness test will be conducted by Department personnel using a 12-foot (4 m) California type profilograph.
733.02 Equipment
1.The 12-foot (4 m) California ty pe profilograph will record the pavement profile by measuring the vert ical movement of a sensing wheel, attached to the frame at mid-point, with reference to the mean elevation of the support wheels at each end. The pr ofilograph will produce a profilogram with a vertical scale of 1 inch (25 mm) equals 1 inch (25 mm) vertically and 1 inch (25 mm) equals 25 feet (7.6 m) longitudinally.
733.03 Test Procedure
1.The profilograph test will be r un after completion of the bridge deck and the approach slabs. In the case of a bridge contract which does not include the approach slabs, but which will be let to contract at a future date, the profilograph test will be run on the bridge deck only.
2.In the case where the approach slabs are not part of the bridge contract but are part of another concurr ent contract, the profilograph test will be run after the bridge deck and the approach slabs are completed. In this case, if the approach slabs and the bridge are constructed by separate Contractors, both Contractor s will receive a profilogram.
3.If the paving or approach slabs are not part of the bridge contract or part of another concurrent contract, the pr ofile of the first and last 6 feet (2
m.(longitudinally) of the surface being tested may not be able to be obtained with the profilograph. These areas will be measured for bumps with a 10 foot (3 m) straightedge according to Paragr aph 9.b. of Subsection 603.03 of the Standard Specifications. Areas showing high spots in excess of 1/8 inch (3 mm) in the 10 foot (3 m) span sha ll ground to the required profile.
4.One profile will be obtained in each lane and shoulder approximately 3 feet from the outside lane line. T he profiles will be divided into test sections each 100 feet (30 m) in length with any remaining short length also considered a test section. The profilogram will be labeled with the stationing, lane designation, pos ition on the pavement, and the direction of travel. All station references used on the profilograms will be actual project stationing.
733.04 Evaluation
1.A profile index will be calculat ed for each section. Results will be furnished to the Contractor within 72 hours of the completion of the tests. Bridge Deck and Approach Slab Smoothness 733.06 - 655 - The index is calculated by summing the vertical deviations outside of a 0.2 inch (5 mm) blanking band. The units for this measurement are inches (mm) per 100 feet (30 m).
2.Bumps will be identified separately. These appear as high points on the profile trace and correspond to hi gh points or bumps on the pavement surface. They are identified by locating vertical deviations exceeding 0.15 inch (3.8 mm) for a 12 foot (3.6 m) span as indicated on the profile trace.
3.When surface correction is required, this will be considered a preliminary profile index.
733.05 Surface Correction
1.All corrective work shall be done with the approval and in the presence of the Engineer.
2.Correction of the concrete surface will be done by diamond grinding. Grinding equipment shall be power driven, self-propelled units specifically designed to grind and te xture concrete pavements. The cutting head shall be at least 36 inches (900 m) wide and consist of diamond blades with spacers. The Engineer may approve smaller equipment.
3.Each profile will represent a surface width, extending from the centerline of the bridge to 3 feet (900 mm) in front of the curb or rail, and surface correction will be made over this entire width.
4.The grinding shall be perform ed so that the cement-aggregate bond will not be broken.
5.The maximum depth of grinding that will be permitted is ½ inch (12.5 mm).
6.Residue from grinding operations shall not be permitted to flow across shoulders or lanes occupied by public traffic or to flow into streams, gutters, or other drainage facilities. So lid residue resulting from grinding operations shall be removed from pavement surfaces before such residue is blown by action of traffic or wind.
7.After all required correction work is completed, another profile index will be run and recorded as the final profile index for the segment.
733.06 Acceptance
1.All bumps exceeding a vertical height of 0.15 inch (3.81 mm) in a 12 foot (3.65 m) span, as indicated on the profile trace, shall be corrected. The corrected bumps will be considered satisfactory when measurement by the profilograph show s that the bumps are 0.15 inch (3.81 mm) or less in a 12-foot (3.65 m) span.
2.The Contractor, at his/her expens e, shall correct the surface profile of all pavement which has a profile in dex greater than 0.50 inches (12.5 mm) per 100 feet (30 m) after bump remova l. The surface profile of any such section shall be corrected to an index less than 0.50 inches/100 feet (12.5 mm/30 m).
3.If the profile index cannot be corrected by grinding, to less than 0.50 inches/100 feet ( 12.5 mm/30 m), those areas will be removed and replaced or overlaid with high density-low slump concrete.
733.06 Bridge Deck and Approach Slab Smoothness
- 656 - 4. All surface profile corrective wo rk and remedial work will be at no additional cost to the Department.
5.Bump and smoothness correction work shall be for a width and length satisfactory to the Engineer. - 657 - SECTION 734 -- PRECOMPRESSED POLYURETHANE FOAM (PPF) JOINT
734.01 Description
1.This work shall consist of providing and installing a Preformed Expansion Joint in a preformed gap at the locations and limits shown in the contract.
2.The Preformed Expansion Joint shall be either a Precompressed Polyurethane Foam Joint or a Preformed Silicone Joint, as indicated in the contract.
a.When the item is “Precompressed Polyurethane Foam Joint, Type ___” the joint shall be a Precompressed Polyurethane Foam Joint of the type indicated in the contract.
b.When the item is “Preformed Silicone Joint, Type ___”, the joint shall be a Preformed Silicone Joint of the type indicated in the contract.
c.When the item is “Preformed Expansion Joint, Type ___”, the joint may be either a Precompressed Polyurethane Foam Joint or a Preformed Silicone Joint of the ty pe indicated in the contract.
734.02 Material Requirements
1.Precompressed Polyurethane Foam Joints:
a.PPF Joint shall be precompressed self-expanding polyurethane foam with factory applied silicone facing on top of the foam.
b.PPF joints shall be ordered for the joint material dimension shown in the contract.
c.Approved PPF Joint systems are shown on the Department’s Approved Products List under Precompressed Polyurethane Foam Joint, Type A or B.
2.The approved Preformed Silicone Joint systems are shown on the Department’s Approved Products List under Preformed Silicone Joint, Type A or B.
3.Primers, epoxy adhesives, and silicone sealants shall comply with the manufacturer’s recommendations.
4.Materials shall be resistant to ozone, ultraviolet rays, petroleum products, solvents, industrial cleaners, corrosive vapors and acids.
5.Joint material shall be delivered to the Contractor’s storage area and to the job site in the Manufacturer’s original undamaged containers with wrapping intact. Storage of joint material shall be in a dry, enclosed area, off the ground, between 60 F (16C) and 75 F (24C) and out of direct sunlight until immediately prior to installation.
734.03 Construction Methods
1.The installation of the Pr eformed Expansion Joint and the adhesives shall be completed according to the manufacturer's specifications. Additional field applied silicone is requ ired on both sides of the top of the joint. Any installation that fails to meet the manufacturer's specifications shall be removed and replaced at no cost to the Department.
2.The installation instructions and specifications shall be given to the Engineer 7 days prior to the installation.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 688–690 of 1,048.