623.03 Construction Requirements.
such is considered incidental to the work and the cost included in the unit price bid for the reset item. Should the Contractor remove any portions of the structure in excess of that directed by the Engineer, he shall restore the structure to the designated removal line without additional compensation.
622.04 Method of Measurement.
Manhole covers reset and gratings reset will be measured individually as one complete unit of the base height or less as provided by the plan details. Where adjustments to the manhole covers or gratings reset exceed the base unit height, measu rement and payment for the excess height will be made as provided in Articles 621.04 and 621.05 for Manhole or Inlet Units.
622.05 Basis of Payment.
a.Unit Price Coverage .
1.Accepted manhole covers reset, measured as provided above, will be paid for at the contract unit price for Manhole Covers Reset, which shall be payment in full for all material, equipment, tools, labor, and incidentals necessary to complete the work.
2.Accepted gratings reset, measured as provided above, will be paid for at the cont ract unit price for Gratings Reset, which shall be payment in full for all material, equipment, tools, labor, and incidentals necessary to complete the work.
b.Payment will be made under Item No .: 622-A Manhole Covers Reset - per each 622-B Gratings Re set - per each CURB, GUTTER, AND COMBINATION CURB AND GUTTER
623.01 Description.
This Section shall cover the work of constructing Portland cement concrete gutter, curb, or combination curb and gutter, constructed with or without metal reinforcement. All of which shall be constructed in accordance with the plan details and these specifications at the locations shown on the plans or established in conformity with the lines, grades, dimensions, and cross s ections shown on the plans or designated.
623.02 Materials.
All materials shall conform to the requirements of Division 800, Materials. Concrete shall conform to the requirements of Section 501. Expansion joint filler shall be as specified in Section 832.
623.03 Construction Requirements.
a.Concrete Mixes . Concrete mixes shall be provided by Section 501, with Class A concrete being used with standard forms and either a Class A or Class C concrete mix, modified as deemed necessary by the Testing Engineer, to fit the type curbing machine being used.
b.Foundation . The foundation shall be constructed or excavated to the required depth below the finished surface in accordance with the cross section shown on the plans or as designated. All soft or ot her unsuitable material shall be removed and replaced with suitable material, in layers not to exceed 4 inches {100 mm} compacted. The foundation shall be compacted as provided for the applicable types of material involved.
c.Foundation Backfill . If provided by the plans and/or proposal, foundation backfill to replace unsuitable material shall be placed and constructed as provided in Section 214. No direct payment will be made for foundation backfill, except when the proposal includes a unit price for t his pay item.
623.03 Construction Requirements.
d.Forms .
1.General . The Contractor shall use standard type metal forms as noted herein or, if requested in writing and approved by the Department, an approved automatic extrusion type curb and/or gutter machine.
2.Standard Forms . These forms shall be metal, except for radial sections, straight, and free from warps and of sufficient strength, when staked, to hold the concrete true to line and grade without distortion. They shall provide the approved typical section and depth of the section shown on the plans. Radial or curved forms may be of flexible metal or a wood form of approved design. Bent or damaged forms shall not be used. All forms shall be securely staked, braced, and held together to the exact lines and grades established and shall be kept sufficiently tight to prevent leakage of mortar. All forms shall be cleaned and oiled with a suitable oil immediately before concrete is placed against them.
3.Machine Formed . Any automatic extrusion type curb and/or gutter machine consi dered for approval must be demonstrated to produce a section conforming to the dimensions, cross -section, lines, and grades shown on the plans within the tolerances provided in Item 623.03(h)2 for formed curbs and/or gutters. Failure to consistently produc e an acceptable product shall be cause to withdraw approval of the machine and order the use of standard forms. All types of curbs, gutter, and combinations shall be placed in one operation, to the depth of cross section specified on the plans. The use of a two stage operation will not be permitted.
e.Sections . Gutter, curb, and combination curb and gutter shall be constructed in sections of the lengths shown on the plans. The length of section may be reduced where necessary to form closure.
f.Handling, Proportioning, and Mixing Materials . The handling, storage, proportioning, and mixing of concrete shall conform to the requirements of Section 501.
g.Joints . All expansion, contraction, and construction joints shall be constructed as shown on the plans and in accordance with the requirements of Article 501.03. If not shown on the plans, joints shall be placed as follows:
1.Expansion joints shall be placed in curb and/or gutter to match those in concrete pavement where the two are adjacent.
2.Expansion joints shall be 3/4 of an inch {20 mm} wide. They shall be placed where curb, gutter or combined curb and gutter terminate against concrete driveways and other concrete structures except inlets. The joints shall be placed at least 20 feet from the location of the termination of the curb, gutter or combined curb and gutter at inlets.
3.Expansion joint filler and sealer shall meet the requirements given of Articles 832.01 and 832.02. Expansion joint filler shall extend from the bottom of the curb and/or gu tter to within 1 inch {25 mm} of the top; the sealer shall be 3/4 of an inch {20 mm} thick and shall be recessed 1/4 of an inch {6 mm} from the top.
4.Contraction joints shall be placed in curb and/or gutter to match those in concrete pavement where the t wo are adjacent, but in no instance more than 20 feet {6 meters} between joints. The contraction joints shall be sawed or otherwise cut 2 inches {50 mm} deep by 1/8 of an inch {3 mm} wide and shall extend 2 inches {50 mm} below the pavement surface.
h.Placing and Finishing Concrete - Standard Method .
1.Placing . The subgrade and forms shall be checked and approved just prior to placing concrete against them. All debris or other foreign material shall have been removed from the space to be occupied by the concrete. The subgrade shall be moist but not wet or muddy. After mixing, the concrete shall be placed in the forms and shall be tamped, spaded, or vibrated sufficiently to produce a dense homogeneous mass and to bring the mortar to the surface. Particular attention shall be given to spading the concrete along and against the surface of the forms to prevent honeycombing and secure a smooth, uniform surface.
623.05 Basis of Pay ment.
2.Strike -Off and Finishing. When the forms are filled, the concrete shall be struck off with a templ ate, cut to the curb edge design. The exposed concrete surface shall then be finished smooth with a wooden float in a manner that will compact the mass and produce a true, even top surface. Plastering with mortar to build up or finish will not be permitted . The surface of the gutter and the face and top of the curb shall be checked with a 10 foot {3 m} straightedge and any irregularities more than 1/4 of an inch in 10 feet {6 mm in 3 m} corrected. The alignment and grade shall not at any point vary more tha n 1/2 of an inch {10 mm} from that established by the elevation control stakes. Excessive troweling with a steel trowel will not be permitted. A textured finish shall be provided on the exposed surface just before the concrete becomes nonplastic by the use of a burlap or cotton fabric drag, brush, or broom which will produce a uniform gritty texture along the length of the curb, gutter, or combination curb and gutter. The upper edges of curb and gutter shall be rounded with an approved edging tool to the radius shown on the plans. The joint templates shall be set during the placing of the concrete and allowed to remain in place until the concrete has set sufficiently to hold its shape, but shall be removed while the forms are still in place. The forms shall be left in place until the concrete has set sufficiently so that they can be removed without damage to the work, but, unless otherwise directed, they shall be removed within 24 hours after the concrete has been placed. Immediately after the removal of the forms, the repair of any minor defective areas shall be accomplished.
i.Placing and Finishing Concrete - Machine Laid . The requirements of Subarticle 623.03(h) are applicable except that fixed forms are not required.
j.Curing and Protection. Immediatel y after the finishing operation is completed, the concrete shall be cured as provided by Subarticle 450.03(m). If mats are used, they shall be kept continuously moist for a period of at least 72 hours. During this period, and until completion and acceptanc e of the work, it shall be protected from damage by the elements or other cause.
k.Backfilling . After the concrete has set sufficiently, spaces along the front and back sides of the gutter, curb, or combination curb and gutter, shall be backfilled to the required elevation with suitable material which shall be compacted by tamping with approved metal tamps or mechanical tamps in layers not more than 4 inches {100 mm} thick until firm and solid.
623.04 Method of Measurement.
Accepted Concr ete Gutter, Concrete Curb, and Combination Curb and Gutter will be measured in linear feet {meters}, complete in place, to the nearest 0.1 foot {0.1 m} along the base of the curb face or along the flow line of the gutter continuing on such line extended ac ross driveways, alleyways, and other entrances. Measurement for separate payment for Foundation Backfill will only be made when Item 214-B is provided in the proposal.
623.05 Basis of Payment.
a.Unit Price Coverage . The accepted length of Concrete Gutter , Concrete Curb, and Combination Concrete Curb and Gutter, measured as provided above, will be paid for at the respective contract unit prices, complete in place, which shall be payment in full for all excavation, backfilling, disposal of surplus material, all joints, all special construction at driveways and other entrances and other points, furnishing all materials, hauling and placing materials, and for all labor, equipment, tools, and incidentals necessary to complete the work in accordance with the specifications including all approaches through curb and gutter indicated on the plans.
b.Payment will be made under Item No .: 623-A Concrete Gutter - per linear foot {meter} 623-B Concrete Curb, Type ____ - per foot {meter} 623-C Combination Curb & Gutt er, Type ____ - per linear foot {meter}
624.01 Description.
SECTION 624 CABLE GUIDERAIL
624.01 Description.
This Section shall cover the work of furnishing and installing posts, anchors, cables and miscellaneous hardware required for the constructi on of tensioned cable guiderail.
624.02 Materials and Design.
The cable guiderail system shall be a system accepted by ALDOT and determined by FHWA as passing NCHRP Report 350 or the AASHTO Manual for Assessing Safety Hardware (MASH) requirements for the Test Level, post spacing, slope, placement location, and other details as shown on the plans. The cable guiderail system shall be designed by the manufacturer, specific to the project site, to limit the deflection to the design value shown on the plans. Th e manufacturer’s design shall take into consideration the locations of the cable guiderail and cable guiderail runs as shown on the plans. The manufacturer shall design anchors for the beginning and ending termini of each cable guiderail run as shown in t he plans and shall determine if intermediate anchors within each cable guiderail run are necessary to limit the deflection to the design value.
624.03 Construction Requirements.
a.Submittal of the Design and Details of the Proposed Cable Guiderail Syste m. The Contractor shall submit 5 sets of copies of the manufacturer’s system design and details to the Engineer within 14 calendar days after the date of the "Notice to Proceed". The contract documents may include information regarding the existing soil, but it is the Contractor’s responsibility to provide the cable guiderail system manufacturer with any geotechnical information needed to design the cable barrier system. The Contractor shall include the manufacturer’s required soil parameters and the resul ts of the geotechnical investigations in the submittal package. The submittal shall include a written statement from the cable guiderail manufacturer that the proposed cable guiderail system’s anchor spacing is adequate to limit the deflection to the des ign value shown in the plans. The manufacturer’s statement shall be signed and stamped by a Professional Engineer registered in the State of Alabama. If clarifications are required, one set of the submittal will be returned to the Contractor with comments for clarification. The Contractor will be allowed 14 calendar days to provide clarification of the submittal. The Contractor shall submit 5 sets of copies of the system design and details to the Engineer in each response to the request for clarification by the Engineer. The Engineer will not approve the submittal but will review the submittal for completeness. The Engineer will distribute copies of the submittal when the review is complete.
b.Contractor’s Responsibility for System Installation. The Contractor shall be fully responsible for insuring that the cable guiderail system is constructed in compliance with the cable guiderail manufacturer’s recommendations and requirements.
c.Cable Guiderail Manufacturer’s Representative. A representati ve of the cable guiderail manufacturer shall be present at the site of the installation during the various phases of installation to insure that the Contractor installs all components of the cable guiderail system in accordance with the manufacturer's requ irements. The various phases of installation include anchor installation, line post installation, attachment to guardrail, splicing cable, cable tensioning, etc. The manufacturer's representative shall provide training for Departmental personnel applicable to the installation and maintenance procedures for all features of the guiderail. The manufacturer’s representative may also be required to provide training for local first responders regarding precautions to be taken when working in and around crash sit es involving the guiderail. The training sessions will be conducted at a location determined by the Engineer and will be of sufficient length to address all training topics.
d.Letter of Compliance. Within five calendar days after the completion of the installation of all components of the cable guiderail system, the Contractor shall submit a letter from the manufacturer to the Engineer stating that all components of the cable guiderail system, foundations, and all geotechnical conditions are in
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 508–510 of 934.