520BITUMINOUS PATCHING OF CONCRETE PAVEMENT

- 387 - SECTION 520 -- BITUMINOUS PATCHING OF CONCRETE PAVEMENT

520.01Description

the concrete pavement with bituminous material. The work will be performed at locations shown in the contract or designated by the Engineer. This work shall include removing and disposi ng of deteriorated pavement and/or existing bituminous patching material , preparation of the repair areas, and furnishing, placing, and compacting the bituminous patch material in the repair area.

520.02Material Requirements

plant-mixed with a liquid asphalt blend. The bituminous material shall be capable of coating aggregates without stripping. The patching material shall be capable of maintaining adhesive qualities in patched areas which are damp or wet at time of application.

liquid asphalt blend with chemical additives capable of coating wet aggregates without stripping. The binder shall be homogeneous, free from water, and shall not foam when heated to mixing temperature. The bituminous material shall meet the following requirements: Requirement Criteria ASTM D-1310 Flash Point (TOC): 200°F (94 °C) AASHTO T201 or ASTM D-2170 Kinematic Viscosity at 140°F (60°C): 300-4000 AASHTO T55 or ASTM D-95 Water: 0.2% Maximum AASHTO T78 or ASTM D-402 Distillate Test (Volume of original sample): To 437°F (225 °C): None To 260 ° C (500° F): 0-5% To 315 ° C (600° F): 0-25% Residue from Distillate at 360 ° C (680° F): 72-95% Residue Tests: AASHTO T202 or ASTM D-2171 Abs. Viscosity at 140°F (60 °C):

125-425Poise

AASHTO T49 or ASTM D-5 Penetration: 200 Minimum AASHTO T51 or ASTM D- 113 Ductility at 39°F (4 °C) 1 cm/min: 100 Minimum AASHTO T44 or ASTM D-2042 Solubility in Trichloroethylene: 99% Minimum

Bituminous Patching of Concrete Pavement

- 388 - 3. Aggregate - The aggregates hall consist of a crushed limestone complying with the following requirements: English Sieve Size (Metric) Percent Passing 3/8 inch (3.5 mm) 90-100 No. 4 (4.75 mm) 20-55 No. 8 (2.36 mm) 5-30 No. 16 (1.18 mm) 0-10 No. 50 (300 µm) 0-5

Requirement Criteria AASHTO T104 or ASTM C-88 Soundness Loss (Sodium-5 Cycles): 12.0% Max. AASHTO T96 or ASTM C-131 Los Angeles Abrasion Loss: 40.0% Max. AASHTO T-11 or ASTM C-117 -200 Sieve (75 μm) (By Wash): 2.0% Max. AASHTO T-85 or ASTM C-127, 128 Absorption: 1.0%-2.5% AASHTO T-85 or ASTM C-127, 128 Specific Gravity: 2.55-2.75 Other Deleterious Matter: NDOT T504 Soft Pieces 3.0% Max. NDOT T504 Coal and Lignite 1.0% Max. NDOT T504 Shale 2.5% Max.

bituminous material and aggregate as described above, plant-mixed in such a manner as to contain a minimum of 100 lbs. (45.4 kg) of bituminous material for each finished ton (.9 Mg).

the basis of a producerce rtification of the finished product. Bituminous patching materials approved for use are shown on the Department’s Approved Products List as cold mix.

520.03Construction Methods

area is greater than 10 sq. ft. (0.9 m2), then the Engineer must approve either a bituminous repair or a Port land cement concrete (PCC) repair. A PCC repair will be done as extra work if PCC repair is not a bid item. The deteriorated concrete shall be removed to a minimum depth of 4 inches (100 mm) or to sound concrete. The deteriorated concrete may be removed to a depth specified with a self-propelled milling machine or a 35 pound (15.9 kg) maximum jack hammer. The operation of the machine must be closely monitored to insure that t he impact and vibration of the milling head will not cause damage to the slab out side of the area designated for patching. The radii at the ends of each milled area must be cut to a reasonably neat vertical face with a 15 pound (6.8 kg) chipping hammer. For areas smaller than the milling head, removal must be accomplished with a 35 pound (15.9 kg) jack hammer or other equipment approved by the Engineer. Bituminous Patching of Concrete Pavement 520.04

- 389 - 2. After the deteriorated concrete and/or the existing bituminous patching material has been removed to the extent practical, the spalled areas at the joints or in the conc rete slab shall be thoroughly cleaned.

patching material shall be placed using hand methods to assure complete filling of the repair areas. The repair areas shall be slightly overfilled with bituminous material and compacted to a density that is satisfactory to the Engineer. A mechanically powered hand-held tamper shall be used for the smaller areas and a steel drum vibratory roller, minimum 2.5 ton (2.3 Megagram), shall be used on the other repair areas. The layer of the bituminous material shall not be in excess of that which the equipment is capable of compacting to a uniform density throughout the layer.

shall become the property of the Cont ractor and shall be removed from the project. The material shall be disposed of in accordance with Section 203.

accomplished at the same time the traffic lane is closed for concrete joint and panel repair.

patch material shall be removed and the patch completed during daylight hours in the same working day.

pavement repair or joint repair work is performed, and the drop-off created by the repair is greater than one inch (25 mm), the drop-off will be feathered a minimum of three foot (900 mm) in length for each inch (25 mm) in height with a commercially available cold-mix bi tuminous mixture, or other suitable temporary patch material with a durable surface approved by the Engineer. The Contractor will be required to main tain normal traffic flow across these patches while they are in service. Wher e it has been necessary to use these "temporary patches", they will be re moved, the area cleaned out, and the required permanent asphaltic concrete patch placed. The material, installation, maintenance, removal and disposal of these temporary patches will not be measured and paid for directly, but shall be considered subsidiary to the concrete pavement repair or concrete joint repair work being performed. The asphaltic concrete for the permanent patches shall be any available hot-mix bituminous mixture approved by the Engineer. The hot-mix material will be subsidiary to the items for which direct payment is provided.

520.04Method of Measurement

tons (megagrams) on approved scales.

driver shall carry the original scale ticket, and copy, for each load. The truck driver shall give the copy to the Engineer at the delivery point.

bituminous patching shown on the scale ticket without deduction for the asphalt binder in the mixture.

wasted, damaged, rejected, or applied contrary to these Specifications.

Bituminous Patching of Concrete Pavement

- 390 - 2. The tonnage (mass) shall be the actual weight of the mixture including the liquid asphalt and the chemical additive.

520.05Basis of Payment

Bituminous Patching Ton (Tn) [Megagram (Mg)]

and all sealant manufacturer’s requirements.

- 391 - DIVISION 600 -- PORTLAND CEMENT CONCRETE PAVEMENTS 602 -- PORTLAND CEMENT CONCRETE PAVEMENT SMOOTHNESS 396 607 – CONCRETE SIDEWALKS, BIKEWAYS, AND MEDIAN SURFACING