SECTION 909 — CONCRETE BARRIER — CONCRETE BARRIER
909.01 Description.
This work includes providing MASH compliant concrete barriers on previously prepared gravel borrow subbase courses at the required locations . This work also inc ludes installing barrier delineators as required.
909.02 Materials.
General.
a.Portland Cement Concrete. Use Class HP concrete that conforms to SECTIONS 601 and M02. Field coat all exposed concrete after final installation with a white film forming a concrete sealer. Ensure that cast in place concrete cures not less than 28 days before coating. Use white film forming the concrete sealer that conforms to SECTION M12.
b.R einforcement . Use galvanized bar reinforcement that conforms to Subsection M05.02. Use dowels that conform to ASTM A36 and that are galvanized according to Subsection M05.06.
c.A nchor Bolts for Light Standards . Use b olts and nuts that conform to Subsection M05.05.4(a). Ensure that the top exposed 4 in. of anchor bolts are galvanized, together with their nuts according to Subsection M05.06.
d.B arrier Delineators . Use delineators that have a minimum of 9 sq in. of reflective surface area and that can be mounted on the side of the barrier by use of an adhesive or other method approved by the manufacturer. Use delineators that are on the Department's Approved Materials List.
909.03 Construction Methods.
Plant Requirements.
a.Manufacture. Manufacture concrete barrier units according to SECTION 601 and SECTION 809.
b.R einforcement . Ensure that all reinforcing bars have a minimum cover of 2 in.
c.Dowels, Light Standard Bolts . Set d owels accurately and maintain the dowels at right angles to the plane of the end of the unit. Space anchor bolts for light supports accurately in the required bolt circle and maintain vertical to the plane of the bottom of the recess.
d.Ca sting . Cast the units with the forms in a 180-degree inverted position. Devices cast flush with the bottom of the barrier to facilitate removal from the forms may remain in place with the approval of the Engineer. Locate the lifting devices so that the unit will not be over-stressed while lifting in the inverted position. Ensure that the finish on all exposed surfaces is smooth and dense concrete with a reasonably uniform appearance. No rub will be required, but immediately fill and finish any air holes after form removal to the satisfaction of the Engineer.
Part 900 — Incidental Construction and Services August 2025
SECTION 909 — CONCRETE BARRIER 900-31 Do not remove units from forms before attaining the minimum seven- day compressive strength.
e.Inspection. Inspect all precast concrete barrier units both at the points of manufacture and on the Project site. Remove and replace any units showing defects or damage at no additional cost to the State.
f.Tol erances . Ensure that the concrete barrier units are cast true and square according to the applicable details. Ensure that the dimensions of units are accurate within the following tolerances: Dimension T olerance ± Greater than 0 in. to 12 in. ¼ in. Greater than 12 in. to 24 in. ½ in. Greater than 24 in. to 72 in. ¾ in. Greater than 6 ft to 20 ft 1 in.
g.Barrier Delineators. Install white reflectors on the right side of the road and amber on the left side. Affix the delineators to the top of the barrier. If there is an object that prohibits the installation on the top, install the delineator on the face of the barrier facing the direction of traffic. Preparation of Subbase. Place the subbase according to Subsections 302.03.1 and 302.03.2. Setting. Place units on previously prepared gravel borrow subbase to the required lines and grades. Use precast concrete blocks previously set in the compacted subbase and flush with the finished grade. When single-faced barrier units are installed on horizontal curves and/or at locations where they are back-to-back because of a grade difference between roadways, the Contractor will be allowed to use 2 -in. × 4- in. timbers as spacers to facilitate the installation of the units. Fill the space between the units with a cement concrete grout mixture approved by the Engineer. Haul, store, hoist, and handle the units to prevent cracking or damage. Remove and replace any units showing defects or damage at no additional cost to the State.
909.04 Method of Measurement.
Concrete Barrier is measured by the number of linear feet installed. Standard precast concrete barrier light units and transition units and barrier delineators are incidental to the Concrete Barrier and will not be measured separately for payment.
Part 900 — Incidental Construction and Services August 2025
900-32 SECTION 909 — CONCRETE BARRIER
909.05 Basis of Payment.
The Department will pay for the completed and accepted quantities as follows. Pay Item Pay Unit Concrete Barrier LF The price constitutes full compensation for all labor, materials, and equipment for furnishing and placing units on previously prepared compacted subbase courses, including spacer timbers and concrete grout where applicable, and for the s tandard precast concrete barrier light units and transition units , barrier delineators , all incidentals required to finish the work, complete and accepted. Payment for compacted gravel borrow subbase course is not included in the Contract unit prices for concrete barrier units.
Part 900 — Incidental Construction and Services August 2025
SECTION 910 900-33 This Section has been Reserved for Future Use.
Referenced in this section
Sections that cite this one
Concrete Barrier in other states
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Source: Standard Specifications for Road and Bridge Construction (Blue Book), 2022 (Aug 2025 compilation) Edition. Pages 637–640 of 951. View official source ↗