I. DESCRIPTION The work covered by this project shall include texturing existing concrete and/or asphalt pavement at locations and widths stated in the Proposal, cleaning the textured surfaces, and collecting and disposing of all surface materials generated during the texturing process at locations approved by the Department. II. EQUIPMENT The equipment used shall be specifically designed and built for high production pavement texturing. Use equipment employing the HVIM (High Velocity Impact Method) by hurling steel abrasive media at a high velocity to abrade and texture the surface. The equipment shall be capable of varying the velocity of the steel abrasive as well as the speed of the machine to produce the desired surface texture such that a 12 foot wide lane is completed with a maximum of two parallel passes. The equipment shall be equipped with a vacuuming method to recover the abrasive and surface materials without emitting objectionable dust into a minimum 6 cubic yard container in such manner that meets or exceeds all local, State, and Federal air pollution control laws and regulations. Each equipment unit shall have a minimum average production rate of 1200 square yards per hour for concrete pavement and 1800 square yards per hour for asphalt pavement. The equipment shall direct the velocity of abrasion in a bi -directional fashion, giving uniform abrasion to the surface. When transverse grooves are present, use equipment that directs abrasion at an angle transverse to the grooves to give equal texture to the groove edges. The equipment shall have on -board controls capable of providing and monitoring uniform velocity and direction, and with self -contained lighting for night operations. Provide additional equipment to electro -magnetically remove any remaining steel abrasive at the same width and production rate of the texturing equipment if deemed necessary by the Engineer. Upon request by the Engineer, the Contractor may be required to provide documentation from previous pavement texturing projects demonstrating the ability to meet the requirements of this specification or conduct test sections at no cost to the Department to demonstrate that ability, prior to the approval of the use of the equipment within the limits of the project. The liquid densifier application equipment must consist of either bulk liquid tanks or IBCs, a positive displacement pump that has onboard monitoring and cloud reporting, and a spray bar. The positive displacement pump must be electronically operated, be able to place 1000 gallons of liquid densifier per hour, automatically adjust application rate within 2% tolerance during the installation. The monitoring component of the system must be able to display gallons placed, square feet per gallon target, GPS installation positions with station reporting, material applied at each station, application rate with the date and time of each installation. Each report will indicate the name of the installer, contract ID, and material installed. The spray bar must be able to accommodate a 12 LF pass, provide even coverage across the lane High Velocity Surface Texturing Page 2 of 3 during the application. The spray tips must not atomize the material or present a traffic hazard in adjacent lanes. A manufacturer rep with a minimum of 10 years of on grade densifier application experience must be present for the application of material to oversee application rates, profile of substrate and monitor correct procedure. III. MATERIAL Provide a liquid densifier that contains > 8% reactive lithium silicate densifier that is water based, and the solids component is 100% reactive. It must also contain highly active wetting agent for better aggregate penetration and a siliconate/silane blend for added water repellency to mitigate moisture damage caused during freeze/thaw cycles. The liquid densifier must not be film forming or create a friction/traction hazard once visibly dry. The liquid densifier must contain ≤ 2% sodium or potassium elements in the solution. The material must be packaged in a minimum of 275 -gallon IBC’s or other bulk transport. IV. CONSTRUCTION Texture the pavement surfaces in a continuous operation of consecutive passes up to 6 feet in width, parallel to the centerline such that a 12 foot wide lane is completed with a maximum of 2 passes. Operate the equipment in such a manner that the textured surface has a uniform surface appearance, with a non -directional texture, and is devoid of machine produced streaks, ruts, or over -lap grooves which will inhibit the free flow of water
