- 430 - SECTION 606 -- CONCRETE CURB AND CONCRETE GUTTER
606.01 Description
1.The Contractor shall furnish all materials and construct concrete curb, combination concrete curb and gutter, and concrete gutter as described in the contract. This Section sh all not include integral curb that is covered under Section 603.
606.02 Material Requirements
1.The concrete Class shall be specified in the contract.
2.All materials shall be furnished by the Contractor and shall conform to the requirements in Table 606.01. Table 606.01 Material Requirements Applicable Materials Section Portland Cement Concrete ...................... 1002 Joint Sealing Filler ................................... 1014 Preformed Join t Filler .............................. 1015 Reinforcing St eel ..................................... 1020, 1021, 1024 Deformed Metal Join t Material ................. 1027 Curing Materi als ...................................... 1010, 1011, 1012, 1013 Aggregates .............................................. 1033 Admixtures .............................................. 1007 Water ....................................................... 1005
606.03 Construction Methods
1.a. The Contractor shall prepar e the curb and gutter subgrades by excavating or filling with suitable material to the required depth below the finished surface in accordance with the dimensions shown in the contract.
b.All soft and yielding or other unsuitable material shall be removed and replaced with suitable material.
c.The material shall be compacted thoroughly by tamping or rolling and finished to a firm, smooth surface.
d.If necessary, water shall be added by sprinkling to facilitate compaction.
e.Concrete shall be deposited upon a thoroughly moistened subgrade. Ponding or puddling shall be prohibited.
2.a. Forms shall be metal, straight, free from warp, and of sufficient strength to resist the pressure of the concrete and vibration.
b.Wood forms or curved metal forms shall be used for curves having a radius of less than 100 feet (30 m).
c.Forms shall be used for both the inside and outside faces of the curb and gutter.
d.All forms shall be thoroughly cleaned and oiled before concrete is placed against them. Forms that have become worn, bent, or broken shall not be used.
e.The forms shall be neatly and tightly joined and then securely pinned and staked to line and grade. Concrete Curb and Concrete Gutter 606.05 - 431 - 3. Slip-form techniques are acceptable.
4.The concrete in curbs and/or gutters shall be deposited full depth in one operation and shall be consolidated immediately after being placed with an internal vibrator.
5.a. The Contractor shall fini sh the exposed surfaces with a wooden or cork hand float.
b.The Contractor shall finish concrete gutters in accordance with the requirements of Subsection 603.03.
c.The edges of the curb face and backs are to be rounded in accordance with the details shown in the contract.
6.a. Contraction joints are to be opened with a double edger while the concrete is still plastic.
b.Preformed joint filler shall be placed at locations and in accordance with the details shown in the contract and double-edged while the concrete is plastic.
7.Forms may be removed 12 hours after the concrete has been placed. All honeycomb areas or small defects shall be properly pointed with mortar (1 part cement and 2 parts sand) or an approved grout.
8.When the inside or outside face of the curb and gutter forms a joint with other surfacing, all surplus conc rete shall be remo ved from the face.
9.The Contractor shall cure concrete by one of the methods described for curing concrete pavement in Subsection 603.03.
606.04 Method of Measurement
1.The quantity of curb and combination curb and gutter will be measured in linear feet (meter).
2.The quantity of concrete gutter will be measured in square yards (square meters).
606.05 Basis of Payment
1.P a y I t e m P a y U n i t Concrete _____ Curb Type _____ Linear Foot (LF) [Meter (m)] Concrete _____ Curb _____ Linear Foot (LF) [Meter (m)] Concrete _____ Island Curb _____ Linear Foot (LF) [Meter (m)] Concrete _____ Median Curb _____ Linear Foot (LF) [Meter (m)] Concrete _____ Barrier Curb _____ Linear Foot (LF) [Meter (m)] Combination Concrete _____ Curb and Linear Foot (LF) Gutter _____ [Meter (m)] Concrete _____ Gutter Square Yards (SY) [Square Meter (m2)]
606.05 Concrete Curb and Concrete Gutter
- 432 - 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.
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 will be used to determine the actual 28-day compressive strength of each day's production.
2.Cores must be taken and tested within seven (7) days of being notified of the strength deficiency.
3.The Engineer shall select the site where the cores will be taken.
3.Payment is full compensation for all work described in this Section. - 433 - SECTION 607 -- CONCRETE SIDEWALKS, BIKEWAYS, AND MEDIAN SURFACING
607.01 Description
1.The Contractor shall furnish all materials and construct sidewalks, curb ramps, bikeways, and median surfacing of Portland cement concrete on a prepared subgrade as described in the contract.
607.02 Material Requirements
1.The concrete Class will be specified in the contract.
2.Fill for medians shall be sand, millings, crushed concrete or other suitable material approved by the Engineer.
3.Approved detectable warning panels are shown on the Department’s Approved Products List.
4.All materials shall be furnished by the Contractor and shall conform to the requirements in Table 607.01. Table 607.01 Material Requirements Applicable Materials Section Concrete .................................................................. 1002 Fly Ash .................................................................... 1008 Aggregate ................................................................ 1033 Preformed Join t Filler .............................................. 1015 Steel Bars for Concrete Reinforcem ent ................... 1020
607.03 Construction Methods
1.Sidewalks, curb ramps, and bikeways shall be constructed as shown in the contract.
2.a. The Contractor shall pre pare the subgrade by excavating or filling to the elevation de scribed in the contract.
b.The subgrade shall be t horoughly compacted to insure stability.
c.In fills, the su bgrade shall be made at least 1 foot (300 mm) wider on each side of the required bikeway and/or sidewalk width.
d.Concrete shall be deposited upon a thoroughly moistened subgrade. Ponding or puddling shall be prohibited.
e.Sand fill, when required, shall be uniformly compacted to facilitate placing the conc rete median surfacing.
3.a. Forms shall be wood or metal and of a depth equivalent to the design thickness of concrete shown in the contract.
b.Forms shall be straight and able to support the concrete pressure without any deformation.
c.The forms shall be securely staked, braced, held firmly to the required line and grade, and sufficiently tight to prevent leakage of mortar.
d.All forms shall be thoroughly cleaned and oiled before the concrete is placed against them.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 464–466 of 1,048.