707.01 DESCRIPTION. Furnish and construct curbs and gutters in
accordance with these specifications and in conformity with lines, grades, dimensions, and typical sections shown on the plans or established.
707.02 MATERIALS. Materials shall comply with the following
sections and subsections: Usable Soil 203.06.1 Asphalt Concrete Section 502 Portland Cement Concrete (Class A1, B, D) Section 901 Asphalt Cement Section 1002 Aggregates Section 1003 Joint Fillers 1005.01 Joint Sealant 1005.02 Joint Seals 1005.03 Curing Materials 1011.01 Form Release Agent 1018.06
707.02.1 Concrete Curbs and Gutters: Use the same type of
concrete for curbs and gutters as used throughout the project, unless shown otherwise on the plans.
707.02.2 Asphalt Concrete Curbs: Use Asphalt Concrete (Level
A) mixtures for asphalt concrete curbs in accordance with Section 502.
707.03 SUBGRADE. Shape the subgrade and compact to a firm, even
surface. When possible, shape the subgrade and compact at the same time and in the same manner as the subgrade for the pavement. Remove unsuitable material and replace with approved material at no direct pay.
707.04 CONCRETE FORMS. Use forms for combination curb and
gutter conforming to 601.03.1.8 and 601.03.5. Forms for other curbs or gutters shall be wood or metal, straight, and of sufficient strength to resist pressure of the concrete without deforming. Clean forms and coat with form release agent before concrete is placed against them. Do not use forms that are excessively worn, bent, or broken. An approved mechanical curb forming machine conforming to 707.06.3 may be used without forms.
707.05 CONCRETE JOINTS. Form joints in integral curbing to
correspond with transverse joints in the pavement slab. Extend joints under and through the curb; finish and fill with the specified filler. Form other types of curbing with 1/4 inch joints at maximum intervals of 20 feet. Form by using steel plates 1/4 inch thick, cut to section, and set vertically in forms until concrete has set sufficiently to permit removal of plates. Tie-ins of existing concrete curbs and gutters shall be made by full depth sawing at no direct pay.
707.06 Placing Concrete.
707.06.1 Integral Types: After concrete pavement has been struck
off, clamp the curb forms or otherwise securely fasten in place on the slab form. Place concrete for curbing and thoroughly tamp within 30 minutes after pavement has been finished. Spade or sufficiently vibrate concrete to eliminate voids and tamp to bring mortar to the surface. Finish the concrete smooth and even with a wooden float. Round edges to the specified radius with an approved finishing tool. Take care to ensure that the pavement and curb are constructed monolithically. Integral type curb may be placed after completion of pavement, provided steel reinforcement is placed in the pavement of the size, type, and spacing shown on the plans at no direct pay.
707.06.2 Non-Integral Types: Place concrete on the prepared
subgrade, strike off, and consolidate to required thickness. Spade or sufficiently vibrate concrete to eliminate voids and tamp to bring mortar to the surface. Finish smooth and even with a wooden float. Round edges to the specified radius.
707.06.3 Slip-formed Concrete: Slip-formed concrete shall have
uniform consistency. Place with an approved extrusion machine designed to spread, consolidate, and finish concrete in one pass of the machine with minimum hand finishing. Rigidly hold sliding forms together to prevent spreading of forms. After the passing of the forms there shall be no noticeable slumping of concrete. Finished concrete shall be free from voids. Perform any additional finishing required immediately after placement. When slip-formed methods are used, concrete for curbs and gutters shall have no more than a 1-1/2 inch slump.
707.06.4 Tolerances: Do not exceed the theoretical grade of
combination curb and gutter nor be more than 1/2 inch low.
707.07 FINISHING. Remove forms within 24 hours after concrete has
been placed. Fill honeycombed areas and other minor defects with mortar, complying with 1001.03. Plastering will not be permitted on faces of curb or gutter. Remove and replace rejected curb or gutter. Finish the top and face of curb or gutter prior to initial set with a wood float, brush, and water.
707.08 ASPHALT CONCRETE CURB. Place asphalt concrete curb
with an approved extruding machine. Prior to placing curb, apply asphalt tack coat complying with Section 504.
707.09 CURING CONCRETE CURB OR GUTTERS. After
finishing, cure curb or gutter in accordance with 601.03.10.
707.10 BACKFILLING. After curb or gutter has set sufficiently,
backfill adjacent to curb or gutter with usable soil complying with 203.06.1 compacted to the density of surrounding soil.
707.11 MEASUREMENT. Quantities of curbs and/or gutters for
payment will be the design lengths as specified on the plans and adjustments thereto. Design quantities will be adjusted if the engineer makes changes to adjust to field conditions, if design errors are proven, or if design changes are made. Excavation, backfill, joint materials, asphalt tack coat, and steel tie bars will not be measured for payment. When combination curb and gutter is specified, gutters required at catch basins will be included in design quantities for combination curb and gutter.
707.12 PAYMENT. Payment for curbs and/or gutters will be made at the
contract unit price per linear foot, subject to the following provisions:
707.12.1 Asphalt Concrete Mixtures: Asphalt concrete curbs will
be subject to the payment adjustment provisions of Section 502. Asphalt cement shall comply with the requirements of Section 1002. The Materials and Testing Section will provide the payment adjustment percentage for properties of asphalt cement.
707.12.2 Portland Cement Concrete: The portland cement
concrete in the curbs and/or gutters will be identified by lots and shall be subject to payment adjustments per linear foot in accordance with Table 901-5. Size, sampling, and testing of each concrete lot shall be in accordance with the Materials Sampling Manual. Payment will be made under: Item No. Pay Item Pay Unit 707-01 Concrete Curb Linear Foot 707-02 Concrete Gutter Linear Foot 707-03 Combination Concrete Curb and Gutter Linear Foot 707-04 Asphalt Concrete Curb Linear Foot
Curbs and Gutters in other states
Get an email when 707 changes
Louisiana revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.