9−23contract unit price per square foot as listed in the Proposal. The price so-s tated constitutes full and complete compensation for all labor, materials, and equipment, including sand base and all incidentals required to finish the work, complete in place and accepted by the Engineer.
909.01 DESCRIPTION. This work consists of providing various types of precast concrete median
barriers on previously prepared gravel borrow subbase courses at the locations indicated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 909.02 MATERIALS. 909.02.1 General.
a.Portland Cement Concrete. Concrete shall be Class XX(AE) and shall conform to the applicable requirements of both SECTIONS 601 and M.02; PORTLAND CEMENT CONCRETE , of these Specifications.
b.Reinforcement . Bar reinforcement shall conform to Subsection M.05.01; Bar Reinforcement , of these Specifications. Dowels shall conform to the requirements of ASTM A36 and be either epoxy coated or galvanized in accordance with Subsections M.05.05 and M.05.06 , respectively, of these Specifications.
c.Anchor Bolts for Light Standards. Bolts and nuts shall conform to Subsection
M.05.04.4, Para. a of these Specifications. The top exposed 4 inches of anchor bolts, together with their nuts, shall be galvanized in accordance with Subsection M.05.06 , of these Specifications.
909.03 CONSTRUCTION METHODS. 909.03.1 Plant Requirements.
a.Manufacture. Precast concrete barrier units shall be manufactured in accordance with the applicable provisions of SECTION 601 and SECTION 809; PORTLAND CEMENT CONCRETE and PRECAST/PRESTRESSED STRUCTURE CONCRETE MASONRY , respectively, of these Specifications.
b.Reinforcement . All reinforcing bars shall have a minimum cover of 2 inches.
c.Dowels, Light Standard Bolts. Dowels shall be accurately set and maintained at right angles to the plane of the end of the unit. Anchor bolts for light supports shall be accurately spaced in the required bolt circle and maintained vertical to the plane of the bottom of the recess. 9−24
d.Casting. The units shall be cast 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 be left in place with approval of the Engineer. Such lifting devices shall be located so that the unit will not be over-stressed while lifting in the inverted position. The finish on all exposed surfaces shall be smooth and dense concrete with a reasonably unifo rm appearance. No rub will be required, but any air holes shall be immediately filled and finished after form removal to the satisfaction of the Engineer. Units shall not be removed from forms before attaining the minimum 7-day compressive strength.
e.Inspection. All precast concrete barrier units shall be inspected both at the points of manufacture and on the project site. Any units showing defects or damage shall be removed and replaced by the Contractor at no additional cost to the State.
f.Tolerances . Precast concrete median barrier units shall be cast true and square in accordance with the applicable details as shown on the Plans. Dimensions of units shall be accurate within the following tolerances: Dimension Tolerance ± Greater than 0" to 12" 1/4" Greater than 12" to 24" 1/2" Greater than 24" to 72" 3/4" Greater than 6' to 20' 1"
909.03.2 Preparation of Subbase . The subbase shall be furnished and placed in accordance with
Subsections 302.03.1 and 302.03.2; Placing and Shaping and Compaction , respectively, of these Specifications. 909.03.3 Setting . Units shall be placed on previously prepared gravel borrow subbase to the lines and grades shown on the Plans. Precast concrete bl ocks, previously set in the compacted subbase and flush with the finish grade, shall be used. When single-faced barrier units are installed on horizontal curves and/or at locations where they are back to back because of a grade differ ence between roadways, the Contractor will be allowed to use 2-inch by 4-inch timbers as spacers to facilitate the installation of the units. The space between the units is to be filled with a cement concrete grout mixture approved by the Engineer. Care shall be exercised during hauling, storage, hoisting and handling of the units to prevent cracking or damage. No damaged units shall be installed. Units showing defects or damage shall be removed and replaced or repaired by the Contractor at no additional cost to the State. 909.04 METHOD OF MEASUREMENT. "Precast Concrete Median Barrier" units of the various types and configurations specified on the Plans will be measured in linear feet of continuous runs of said units actually installed in accordance with the Plans and/or as directed by the Engineer. 9−25"Standard Precast Concrete Median Barrier Light Units" and "Transition Units" will be measured by the number of such units actually in stalled in accordance with the Plans and/or as directed by the Engineer. 909.05 BASIS OF PAYMENT . The accepted quantities of "Precast Concrete Median Barrier" of the various types and configurations specified on the Plans will be paid for at their respective contract unit prices per linear foot as listed in the Proposal. The accepted quantities of "Standard Precast Concrete Median Barrier Light Units" and "Transition Units" will be paid for at their respective contract unit prices per each as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials, and equipment for furnishing and placing units on previously prepared compacted subbase c ourses, including spacer timbers and concrete grout where applicable, and for all incidentals required to finish the work, complete, in place and accepted by the Engineer. Payment for compacted gravel borrow subbase course is not included in the contract unit prices for precast concrete median barrier units. SECTION 910 RAISED REFLECTIVE PAVEMENT MARKER (SNOW PLOWABLE)
910.01 DESCRIPTION . This work consists of providing snow plowable raised reflective pavement
markers (RRPM), yellow, and white, at locations designated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 910.02 MATERIALS. 910.02.1 The Unit . The marker shall be Stimsonite Model 96LP as manufactured by Amerace Corporation, Signal Division, or approved equal. The marker shall consist of an iron casting to which is attached a replaceable prismatic reflective element. The pavement reflector and casting shall be able to withstand snow plowing in opposite directions without sustaining damage.
a.Casting . The casting shall be manufactured of nodular iron conforming to ASTM A536, hardened to 52-54 RC and shall be marked with the manufacturer's name and model number. The dimensions of the casting shall be approximately 9.3 inches long by 5.9 inches wide by 1.7 inches high. Installed height shall be approximately 0.25 inches above the road surface. Its weight shall be approximately 5.4 pounds. The surface of the keel and web of the casting shall be free of scale, dirt, oil, grease or other contaminant which may reduce the bond of the casting to the epoxy adhesive.
b.Reflectors . The reflector shall consist of an acrylic plastic shell filled with a tightly-adherent potting compound. The shell shall contain one or two prismatic retro reflective faces to reflect incident light from single or opposite directions. The reflector shall be laminated to
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 555–557 of 826.