- 439 - SECTION 610 -- CONCRETE MEDIAN BARRIERS
610.01 Description
1.The Contractor shall furnish all materials, construct, and install cast-in-place concrete median barriers and cast-in-place concrete median barrier ends and transition sections in accordance with the details shown in the contract.
610.02 Material Requirements
1.The concrete Class will be specified in the contract.
2.All materials shall be furnished by the Contractor and shall conform to the requirements in Table 610.01. Table 610.01 Material Requirements Applicable Materials Section Concrete .................................................................... 1002 Reinforcing Steel ....................................................... 1020 Dowel Bars ................................................................ 1022
610.03 Construction Methods
1.Construction of the concrete median barrier shall conform to the applicable provisions of Sections 704 to 707.
2.a. The surface finish of the median barrier shall be a rubbed finish in accordance with Subsection 704.03 if shown in the contract.
b.Each individual section of concrete median barrier shall have a uniform color and texture.
3.All forms shall be metal except for end and transition sections.
610.04 Method of Measurement
1."Concrete _____ Median Barrier, Type _____" will be measured by the linear foot (meter). "Concrete _____ Median Barrier End Section, Type ____" and "Concrete _____ Median Barrier Transition Section, Type ______" will be measured by the each.
610.05 Basis of Payment
1.Pay Item Pay Unit Concrete _____ Median Barrier, Type _____ Linear Foot (LF) [Meter (m)] Concrete _____ Median Barrier End Each (ea) Section, Type _____ Concrete _____ Median Barrier Transition Each (ea) Section, Type _____
2.a. The 28-day compressive stre ngth of each day's production will be determined from cyli nder strength tests.
b.Payment shall be reduced by the amount described in Table 603.03.
610.05 Concrete Median Barriers
- 440 - c. (1) If the 28-day compressive strength fails, the Contractor has the option to take 3 core samples, at no additional cost to the Department, and under the supervision of the Engineer. The Department will take immediate custody of the cores at the time of sampling. The average compressive strength of these cores wi ll be used to determine the actual 28- day compressive strength of each day's production.
2.Cores shall be taken and tested within seven (7) days of being notified of the strength deficiency.
3.The Engineer will select the site where the cores will be taken.
3.Payment is full compensation for all work described in this Section. - 441 - SECTION 611 -- SEALING CRACKS
611.01 Description
1.This work shall consist of prep aration and sealing of cracks, located in Portland cement concrete roadway.
611.02 Material Requirements
1.The cracks shall be sealed with a hot-poured type jo int sealing filler which conforms to the requi rements of Section 1014.
611.03 Construction Methods
1.Preparation of Cracks:
a.New cracks 1/4 inch (7 mm) and over in width shall be filled with crack sealing filler. Old cracks sha ll have all existing cr ack sealing filler or other foreign material removed by sandblasting or other methods that provide a clean and dry surface fo r the full depth of the crack.
b.The location of the cracks to be sealed will be designated by the Engineer.
2.Sealing Cracks: a. The Contractor shall furnis h the Engineer, the manufacturer's recommendations for mixing, application, and temperature rest rictions of the hot pour sealer seven days prior to work beginning. These recommendations shall be strictly followed. In no case shall the temperature of the hot pour sealer exceed the maximum heating temperature recommended by the manufacturer. The hot pour sealer te mperature shall not fall below the minimum application temperature recommended by the manufacturer during the application process.
b.When the minimum applicati on temperature of the hot pour sealer is attained, the cracks shall be fi lled as shown in th e contract through the use of a pressure type applicator equipped with a nozzle which will fit into the cracks.
c.The cracks shall be filled full depth as shown in the contract to 1/4 inch to 5/8 inch (7mm to 16mm) below the pav ement surface.
d.Material spilled on surfaces of the pavement adjacent to the crack shall be cleaned away by the Contractor at no additional cost to the Department.
e.Cracks shall not be sealed unt il after any corrective work or Diamond Grinding and Texturing Concrete Pavement is completed.
611.04 Method of Measurement
1.Sealing cracks will be measur ed for payment by the linear foot (meter) of cracks sealed, measured to the nearest foot (meter) of sealed cracks, complete, in place and accepted by the Engineer.
611.05 Basis of Payment
1.Pay Item Pay Unit Sealing Cracks Linear Feet (LF) [Meter (m)]
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 473–474 of 1,048.