454.05 Basis of Payment.
454.05 Basis of Payment.
a.Unit Price Coverage . The contract unit price for cleaning and sealing concrete pavement joints and cracks shall be full compensation for sawing the joints, routing the cracks, furnishing all materials, equipment, tools, labor, and incidentals necessary to clean and seal all designated concrete pa vement joints and cracks.
b.Payment will be made under Item No .: 454-A Cleaning and Sealing Concrete Pavement, Type * ** - per linear foot {meter} * Specify I or II ** Specify Joints or Cracks GRINDING CONCRETE PAVEMENT SURFACES
455.01 Description.
This Section shall cover the work of grinding Portland Cement Concrete pavement at locations shown on the plans or directed by the Engineer. The primary locations will be th e right -hand lane, or truck lane, of each roadway, but may include other locations. Said grinding is intended to substantially correct joint faulting, surface drainage, skid resistance, riding characteristics and/or removal of excessive surface material.
455.02 Materials.
N/A
455.03 Construction Requirements.
a.General . It is intended that areas of the pavement surface designated by the plans or Engineer to be processed shall be ground to eliminate joint or crack faults and to provide a constant pavement cross slope within the designated grinding limits in each lane. Adjacent sides of longitudinal joints or crack shall be in the same plane. Adjacent sides of transverse joints or cracks in excess of 1/16 of an inch {2 mm} shall be reground until flush. If a progress schedule for the grinding operation is not shown on the plans, the Contractor may select his own grinding operation schedule. The grinding operation shall be expeditiously performed in a continuous operation on a traffic lane before grinding begi ns on a succeeding lane. The residue created by the grinding operation shall be satisfactorily removed as the grinding operation proceeds.
b.Equipment . Grinding equipment shall be a self -propelled unit specifically designed to grind Portland Cement concr ete pavement using diamond grinding blades capable of grinding the designated surfaces without causing spalls at cracks or joints or at other locations. The equipment shall be of a size, shape and dimension capable of working within the designated work lim its without restricting the movement of traffic outside of the work limits. The Contractor shall provide positive means for the removal of the grinding residue before such residue is blown by traffic action or wind. Residue shall not be permitted to flow a cross lanes designated for traffic use or into gutters or other drainage structures.
c.Operational Requirements .
1.General . It is the intent that the work of grinding of the pavement surface be performed under traffic. Traffic may be shifted to one lane on a 4 -lane facility; but no consideration will be given to transferring traffic to one travelway during this operation. The area of pavement surfaces to be ground will be designated on the plans, unless directed otherwise by the Engineer. The constructio n operations shall be scheduled and prosecuted in such a manner that a uniform surface finish which eliminates the joint or crack faults while maintaining positive lateral drainage by maintaining a constant cross slope is obtained.
455.04 Method of Measurement.
2.Main Roadway. All pre liminary work of stabilizing and repair on the main roadway shall be completed prior to commencing grinding operations. This preliminary work includes the stabilization of designated pavement slabs and removal and replacement of certain slab sections as noted by plan details or as directed by the Engineer. The entire area of the travelway designated to be ground shall be ground until the adjacent sides of joints and cracks are in the same plane, the cross slope complies with typical section shown by plan details and the surface requirements of Subarticle 455.03(d). It is the intent of this specification that the faulting at joints and cracks be eliminated, the overall roughness be within the specified limits and that the pavement surface of the lane designat ed for treatment be textured.
d.Final Surface Finish . The grinding process shall produce a pavement surface that is true to grade and uniform in appearance with a longitudinal line type texture. Said line type texture shall consist of parallel longitudinal corrugations of approximately 60 evenly spaced grooves per foot {300 mm} with the ridges approximately 1/32 of an inch {1 mm} higher than the bottom of the grooves. Joints and cracks shall be visually inspected to insure that adjacent surfaces are in th e same plane. Misalignment of the surface planes of adjacent sides of joints or cracks which is in excess of 1/16 of an inch {2 mm} shall be ground until the surfaces are flush. The transverse slope of the ground pavement shall be uniform to a degree that no depressions or misalignment of slope greater than 1/4 of an inch {6 mm} in 12 feet {3.5 m} are present when tested with a 12 foot {3.5 m} straightedge placed perpendicular to the pavement centerline. Straightedge requirements do not apply outside o f the ground areas.
e.Smoothness Requirements .
1.Application of Smoothness Requirements. Smoothness requirements shall be applicable to the grinding of the concrete pavement surfaces if Pay Item 455 -C Smoothness Testing, Certified Inertial Profiler is included in the contract.
2.Smoothness Testing Procedure . The smoothness testing procedure shall be ALDOT -448, Evaluating Pavement Profiles. This procedure is posted on the ALDOT Internet site in the pages of the Materials and Tests Bureau. The Mean Roughness Index shall be measured after the grinding of the concrete pavement surface. The results of the smoothness tests will be evaluated by t he Engineer.
3.Contract Price Adjustment based on Mean Roughness Index . Payment for the grinding will be made in accordance with the contract price adjustments given in the following table. Mean Roughness Index Inches/mile/section {meters/kilometer/secti on Contract Price Adjustment, Percent of "Grinding Concrete Pavement" Unit Contract Price Under 40.0 {Under 0.6} 105 40.0 to less than 65.0 {0.6 to less than 1.0} 105 – [(Mean Roughness Index -40)/5)] {105 – [(Mean Roughness Index - 0.6)/0.08]} 65.0 to less than 9 5.0 {1.0 to less than 1.5} 100 95 through 145 {1.5 through 2.3} 100 – [(Mean Roughness Index – 95.0)/2.5] {100 – [(Mean Roughness Index – 1.5)/0.04]} Over 145.0 {Over 2.3} Unacceptable
455.04 Method of Measurement.
The grinding of pavement ordered and accepted will be measured in square yards {square meters} computed from surface measurements taken to the nearest 0.1 of a foot {0.1 m} on the processed pavement. Those areas of pavement requiring corrective action due to inappropriate or unacceptable work or negligence on the part of the Contractor will be excluded from measurement for payment.
455.05 Basis of Payment.
455.05 Basis of Payment.
a.Unit Price Coverage . The grinding of pavement ordered and accepted, measured as noted above, will be paid for at t he contract unit price bid which shall be full compensation for the grinding of the pavement, the removal of grinding residue and the satisfactory disposal thereof, the cleaning of the pavement and for all materials, equipment, tools, labor and incidentals necessary to complete the work. Payment for the grinding will be adjusted in accordance with the requirements for smoothness if Pay Item 455 -C, Smoothness Testing, Certified Inertial Profiler is included in the contract.
b.Payment will be made under It em No .: 455-A Grinding Concrete Pavement - per square yard {square meter} 455-C Smoothness Testing, Certified Inertial Profiler - per each SECTION 490 BRIDGE DECK THIN POLYMER OVERLAY
490.01 Description.
This Section shall cover the work of applying Thin Polymer Overlays (TPO) and crack sealing to waterproof and provide a skid resistant riding surface.
490.02 Materials.
a.General. Materials f urnished for use shall conform to the appropriate requirements of Division 800, Materials, and the requirements noted in this Section.
b.Crack Sealer Material. The crack sealer material, if needed, shall be specified as shown in plans. The crack sealing material shall be a solvent less Type I Grade 1 epoxy as specified in AASHTO M 235. The crack sealer material shall be used to repair bridge deck cracks by gravity feeding. The crack sealer shall meet the properties in TABLE 490 -1. TABLE 490 -1: Proper ties of Crack Sealer Property Requirement* Test Method Viscosity poises, max. 7 ASTM D 2556 Tensile Strength, min. psi. 2500 AASHTO M 235 Elongation, % min. 30 AASHTO M 235 Water Absorption, % by wt. max. 1.0 AASHTO M235 *Based on samples cured and tested at 75°F
c.Overlay Material . The overlay material shall be a completely non -porous polymer bridge deck overlay system designed for low temperature applications. The overlay system shall consist of polymer epoxy binder and aggregate. The overlay system shall not contain any fillers or volatile solvents. The overlay system shall meet the properties in TABLE 490 -2. TABLE 490 -2: Properties of Overlay System Property Requirement* Test Method Viscosity poises 7 - 30 ASTM D 2556 Tensile Strength, min. psi. 2500 AASHTO M 235 Elongation, % min. 30 AASHTO M 235 Adhesive Strength, min. psi. @ 24 hours** 250*** ASTM C 1583 Compressive Strength, min. psi. @ 3 hours*** 1000 ASTM C 579 Method B Compressive Strength, min. psi. @ 7 days*** 5,000 ASTM C 579 Method B Water Absorption, % by wt. max. 1.0 AASHTO M 235 Chloride Permeability, max. Coulombs @ 28 days 100 AASHTO T 277 *Based on samples cured and tested at 75°F **Or the manufacturers minimum cure time
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 281–282 of 934.