SECTION 526 - CONCRETE BARRIER 5-153
526.01 Description This work shall consist of the furnishing, constructing, erecting,
setting, resetting, and removal of concrete barrier and associated elements in accordance with these specifications, the Standard Details and the lines and grades shown on the Plans or established by the Resident. The types of concrete barrier are designated as follows: Temporary Concrete Barrier Type I Double faced removable concrete barrier of the shape shown on the Plans. Permanent Concrete Barrier Type II Double face barrier of a shape shown on the Plans. Permanent Concrete Barrier Type IIIa Single face barrier 32 inches high of a shape shown on the Plans. Permanent Concrete Barrier Type IIIb Single face barrier 42 inches high of a shape shown on the Plans. Permanent Concrete Transition Barrier Barrier of various heights joining steel bridge rail to steel guardrail. Permanent Texas Classic Rail Barrier, either traffic rail or sidewalk rail, as shown on the Plans.
526.02 Materials
a.Concrete Concrete shall meet the provisions of Section 502, Structural Concrete, and Portland cement shall conform to the requirements of AASHTO M85, Type I, II, or III. Concrete for permanent barriers shall be Class LP, in accordance with Section 502.05, Composition and Proportioning. Concrete for temporary barriers shall be Portland cement concrete with a minimum compressive strength of 2,500 psi. The Department reserves the right to take test core samples from the barriers in accordance with ASTM C42. Average compressive test strengths below 2,500 psi will result in rejection of the barriers.
b.Reinforcing Steel Reinforcing steel shall meet the requirements of Section 503, Reinforcing Steel.
c.Structural Steel Plate steel shall meet the requirements specified in Section 713.01, Structural Steel. Hot dipped galvanizing of plate steel shall be in accordance with AASHTO M111 (ASTM A123). 5-154
d.Bolts Bolts shall meet the requirements specified in Section 713.02, High Strength Bolts.
e.Connecting Pin for Temporary Concrete Barrier For all projects on the NHS, including the Interstate System, temporary concrete barriers must be connected using a 1-⅛ inch diameter rod with a washer and cotter pin on the bottom, per Standard Detail 526(02), The Contractor has the option to use a hex nut and washer connection at the top of the rod, as shown on the Standard Detail, or the top of the rod may be hooked over the top connector. The connecting pin must be smooth, not deformed, i.e., reinforcing bar may not be used, and shall meet the strength requirements of ASTM A36 steel, minimum. For projects not on the NHS, temporary concrete barriers must be connected in accordance with Standard Detail 526(02), except that the top of the rod may be hooked over the top connector, instead of using a hex nut and washer. The connecting pin shall meet the strength requirements of ASTM A36 steel, minimum.
526.03 Construction Requirements Permanent Concrete barrier shall be constructed in
accordance with the provisions of Standard Specification Section 502.05, Composition and Proportioning, through Section 502.14, Curing Concrete, inclusive, with the following additions:
a.Permanent concrete barrier may be formed by cast-in-place or slip forming methods.
b.Concrete finish shall be equal to a steel form finish.
c.Liquid membrane-forming compounds may be used for curing concrete barriers, if approved by the Resident. If a membrane-forming compound that contains fugitive dye or other agents which will discolor the concrete is used, the curing compound shall be removed to the satisfaction of the Resident prior to Final Acceptance. When the slip forming method is used, a dissipating curing compound shall be applied to the concrete during placement, and then wet curing shall proceed in accordance with Section 502. In addition to the foregoing methods of curing concrete, barrier may be cured by an accelerated curing method using low-pressure steam or radiant heat in a moist environment. Other methods of curing may be used if approved by the Resident. If called for, protective coating shall be applied in accordance with Standard Specification Section 515, Protective Coating for Concrete Surfaces. Temporary concrete barrier shall be generally free from fins and porous areas and shall present a neat and uniform appearance. Permissible dimensional tolerances for all concrete barriers shall be as follows:
a.Cross-sectional dimensions shall not vary from design dimensions by more than ¼ inch. The vertical centerline shall not be out of plumb by more than ¼ inch. 5-155
b.Longitudinal dimensions shall not vary from the design dimensions by more than ¼ inch per 10 feet of barrier section and shall not exceed ¾ inches per section.
c.Location of anchoring holes shall not vary by more than ½ inch from the dimensions shown in the concrete barrier details on the Plans.
d.Surface straightness shall not vary more than ¼ inch under a 10 foot straightedge.
e.The barrier shall have no significant cracking. Significant cracking is defined as fractures or cracks passing through the section, or any continuous crack extending for a length of 12 inches or more, regardless of position in the section.
526.04 Method of Measurement Concrete Barrier Type II, IIIa, IIIb, and Texas Classic
Rail will be measured for payment by lump sum, complete in place. Temporary concrete barrier will be measured for payment by the lump sum. Lump sum measurement will include verification of the installation and removal of all concrete barrier required by the plans for the Contractor’s operations. The Contractor shall replace sections of temporary concrete barrier damaged by the traveling public when directed by the Resident. Replacement sections will be measured for payment. Transition barrier will be measured by each barrier connecting bridge rail to guardrail, complete in place.
526.05 Basis of Payment The accepted quantities of Texas Classic Rail, Type II, IIIa,
and IIIb concrete barrier will be paid for at the Contract lump sum price for the type specified, complete in place. The accepted quantities of Temporary Concrete Barrier Type I will be paid for at the Contract lump sum price. Such payment shall be full compensation for furnishing all materials, assembling, moving, resetting, transporting, temporarily storing, and removing barrier, furnishing new parts as necessary, and all incidentals necessary to complete the work. Temporary barrier shall become the property of the Contractor upon completion of the use of the barrier on the project, and shall be removed from the project site by the Contractor. Transition barrier will be paid for at the Contract price each, complete in place. The accepted quantity of all types of concrete barrier, whether temporary or permanent, will be paid for at the lump sum or per each price, as applicable, which payment shall be full 5-156 compensation for all materials, including reinforcing steel, steel plates and hardware, equipment, labor and incidentals required, as necessary, to complete the work. Payment will be made under: P a y I t e m P a y U n i t 526.301 Temporary Concrete Barrier, Type I Lump Sum 526.312 Permanent Concrete Barrier Type II Lump Sum 526.321 Permanent Concrete Barrier Type IIIa Lump Sum 526.323 Texas Classic Rail L u m p S u m 526.331 Permanent Concrete Barrier Type IIIb Lump Sum
526.34 Permanent Concrete Transition Barrier Each
Concrete Barrier in other states
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Source: Standard Specifications — Highways and Bridges, 2020 Edition. Pages 444–448 of 817. View official source ↗