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. (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 9−26 an elastomeric pad and adhesively attached to the casting. The reflector shall be shaped like the shallow frustum of a pyramid and shall conform to the following design requirements: Dimensions: 4" x 2" x 0.48" (nominal) Slope of Reflecting Surface: 30 degrees Area of Each Reflecting Surface: 1.87 square inches (nominal) Thickness of Elastomeric Pad: 0.04 inch The outer surface of the shell shall be smooth except for purposes of identification. Thin untempered glass shall be bonded to the prismatic reflective faces to provide an extremely hard and durable abrasion-resistant surface. The shell shall be molded of methyl methacrylate conforming to Federal Specification L-P-380C, Type I, Class 3. The color of the reflective elements when illuminated by an automobile headlight shall be white or amber. Off-color reflection shall constitute grounds for rejection. The reflectors shall be adhered to the casting, in proper position, at the factory.
910.02.2 Epoxy Adhesive; Marker to Roadway . The formulation of epoxy adhesive shall
conform to the requirements of the current issue of AASHTO M237. The manufacturer of the RRPM's must approve of the use of any particular formulation of epoxy adhesive. The epoxy manufacturer shall provide the Engineer with a Certificate of Analysis with the delivery of the material. This certificate shall include the formulation of the adhesive as determined by Certified Test Data of the component parts and the cured system. Tests shall be conducted in accordance with methods set forth in AASHTO M237, current issue. The formulation should be for both components and should indicate all its various parts, their brand names, producers and percent by weight. Certified test data may be provided by either the epoxy adhesive manufacturer or an independent testing laboratory. Test results for each individual batch must be provided. The Contractor shall also furnish to the Engineer a 1-pint sample of each component from the initial batch of epoxy adhesive to be used on the project and each subsequent batch. 910.03 CONSTRUCTION METHODS. 910.03.1 Surface Preparation. At the time of installation, the metal casting shall be free of dirt, oil, grease, rust, moisture or any foreign matter which will impair adhesion to the pavement. It shall be 9−27the Contractor's responsibility to clean each contaminated casting by sand blasting or some other approved method to remove all such foreign matter prior to installation. Pavement markers shall not be placed on pavement surfaces that show evidence of cracking, checking, spalling or failure of underlying base material. If during the laying out process, it is determined that the marker would be installed at a point with one of the aforementioned surf ace defects or at a pavement construction joint, then the marker shall be relocated a distance not to exceed 10 percent of the typical marker spacing. The minimum pavement surface temperature at the time of application shall be that recommended by the epoxy manufacturer. No markers shall be installed if the pavement surface or precut slots are wet. 910.03.2 Installation. Plowable pavement markers shall be installed by inserting the two keels of the casting into parallel slots cut into the pavement, said slots to be partially filled with epoxy adhesive, all in accordance with the RRPM manufacturer's recommendations. The markers shall be placed no later than seven days after the slots are cut into pavement. Before applying the epoxy adhesive, the slots shall be brushed or blown clean of loose material and shall be dry. A pre-determined amount of epoxy shall be placed in and between the slots to ensure that all voids beneath and around the casting are filled so as to create a watertight seal around the casting, and yet not produce an excessive overflow resulting in unacceptable residue on pavement. The keels of the pavement ma rker casting shall be hand placed into the slots in such a manner as to assure that the tips of the marker's deflecting surface are below the pavement surface. The four lugs on the keels of the casting shall be in contact with the pavement. The epoxy adhesive requires that the mixing oper ation and placing of the pavement markers be accomplished in a timely manner. Any mixed batch that becomes so viscous that it cannot be readily extruded from under the marker under light pressure shall not be used. Any heating of the epoxy shall be by the application of indirect heat. The markers shall be protected against traffic until the adhesive has hardened. The following table may be used as a guideline. Minimum Period Protected Ambient Air Temperature oF From Traffic (Minutes) 100 15 90 20 80 25 70 30 60 35 50
1.45 Note 1: No installations will be made at a lower temperature than 50 oF unless the epoxy manufacturer can guarantee his product will harden sufficiently at this lower temperature to withstand traffic in 45 minutes. Excess adhesive on the pavement and on the ex posed surface of the marker shall be 9−28 immediately removed. Any marker leaving a raised end exposed abov e the pavement must be removed. The resulting hole must be filled with an acceptable patch and a new marker properly installed within 2 feet from the faulty installation. 910.04 METHOD OF MEASUREMENT. "Raised Reflectorized Pavement Markers (Snow Plowable)" will be measured by the number of su ch units actually furnished and installed in accordance with the Plans and/or as directed by the Engineer. 910.05 BASIS OF PAYMENT. The accepted quantity of "Raised Reflectorized Pavement Markers (Snow Plowable)" will be paid for at the contract unit price per each as listed in the Proposal. The price so-stated is full and complete compensation for all labor, materials and equipment, including cutting the pavement to the specified dimensions to receive the marker housing, mixing the epoxy adhesive and placing it into the parallel slots, placing the marker units in the prepared slots, and all incidentals required to finish the work, complete in place and accepted by the Engineer. SECTION 911 STONE MASONRY WALLS
911.01 DESCRIPTION. This work consists of providing wet stone masonry walls of standard
designs at locations indicated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 911.02 MATERIALS. 911.02.1 General.
a.Stone . Stone for masonry walls shall conform to the requirements of SECTION M.14; STONE FOR MASONRY , of these Specifications.
b.Mortar. Mortar shall conform to the requirements Subsection M.04.03.5; Mortar , of these Specifications. 911.03 CONSTRUCTION METHODS.
911.03.1 Weather Limitations . Temperature and weather conditions for stone masonry wall
construction shall conform to the provisions of Subsection 807.03.1 of these Specifications.
911.03.2 Mixing of Mortar . The requirements for the mixing of mortar shall conform to the
provisions of Subsection 807.03.2 of these Specifications.
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 557–560 of 826.