408.01 408-1 SECTION 408 JOINT AND CRACK SEALANT DESCRIPTION
408.01 This work consists of furnishing and placing an approved hot poured joint and crack
sealant in properly prepared cracks in asphalt pavements. Cracks with a width greater than 1/8 inch and less than 1 inch are to be filled with this material. MATERIALS
408.02 Materials for hot poured joint and crack sealant shall meet the requirements of
subsection 702.04. Using a mixture of different manufacturers’ brands or different types of sealant is prohibited. CONSTRUCTION REQUIREMENTS
408.03 Immediately before applying hot poured joint and crack sealant, the cracks shall be
cleaned of loose and foreign matter to a depth approximately twice the crack width. Cleaning shall be performed using a hot compressed air lance. This lance shall be used to dry and warm the adjacent asphalt immediately before sealing. Direct flame dryers shall not be used. These Cracks shall be filled with hot poured joint and crack sealant flush with the pavement surface. Immediately following the filling of the crack, excess sealant shall be leveled off at the wearing surface by squeegee, a shoe attached to the applicator wand, or other suitable means approved by the Engineer. The squeegeed material shall be centered on the cracks and shall not exceed 3 inches in width or 1/16 inch in depth. The sealant material shall be heated and applied according to the manufacturer’s recommendations. The equipment for heating the material shall be an indirect heating type double boiler using oil or other heat transfer medium and shall be capable of constan t agitation. The heating equipment shall be capable of controlling the sealant material temperature within the manufacturer’s recommended temperature range and shall be equipped with a calibrated thermometer capable of plus or minus 5 °F accuracy from 200 to 600 °F . This thermometer shall be located so the Engineer can safely check the temperature of the sealant material. Overheating of the sealant material will not be permitted. The face of the crack shall be surface dry, and the air and pavement temperatures shall both be at least 40 °F and rising at the time of sealant application. Sealant material picked up or pulled out after being placed shall be replaced at the Contractor’s expense. The Contractor shall have blotter material available on the project in the event it is required to prevent tracking or pulling. If required, blotter material shall be approved by the Engineer and placed at the Contractor’s expense. 408.04 408-2 METHOD OF MEASUREMENT
408.04 Hot poured joint and crack sealant will be measured by the ton of material used.
The Engineer may require the weighing of equipment for determination of actual quantities of material used. BASIS OF PAYMENT
408.05 The accepted quantities will be paid for at the contract unit price per ton.
Payment will be made under: Pay Item Pay Unit Hot Poured Joint and Crack Sealant Ton All materials, equipment, and costs incidental to the preparation of the surface before application of the hot poured joint and crack sealant will not be paid for separately but shall be included in the work. 409.01 409-1 SECTION 409 CHIP SEAL DESCRIPTION
409.01 This work consists of furnishing and applying asphalt emulsion and cover coat material on
an existing surface, per these specifications and in conformity with the lines shown on the plans or established. When rejuvenating agent or emulsified asphalt is used as a fog seal, cover coat material will not be required. MATERIALS
409.02 Asphalt Emulsion . Emulsified asphalt shall be polymerized or latex modified and shall
be rapid set or medium set conforming to the requirements of subsection 702.02(b). Rejuvenating agent shall conform to the requirements of subsection 702.02(f).
409.03 Cover Coat Material . Cover coat material shall meet the requirements of subsection
703.05 for the type specified. The material will be accepted at the spreader.
CONSTRUCTION REQUIREMENTS
409.04 Weather Limitations . Asphalt emulsion shall not be applied on a damp surface, when
either the air or pavement surface temperature is below 70 °F , or when weather conditions would prevent the proper construction of the chip seal.
409.05 Equipment. The following equipment or its equivalent shall be used:
1.Asphalt distributor and equipment shall be capable of uniformly distributing asphalt emulsion at even temperature and uniform pressure on variable widths of surface up to 15 feet at readily determined and controlled rates from 0.05 to 2.0 gallons per squar e yard. The allowable variation from any specified rate shall not exceed plus or minus 0.02 gallon per square yard. The distributor’s spreading capabilities shall be computer controlled or it shall be calibrated to conform to the distributor manufacturer’s procedure before applying the emulsified asphalt. Distributor equipment shall include a tachometer, pressure gauges, accurate volume measuring devices or a calibrated tank, and a thermometer for measuring temperatures of tank contents. Distributors shall be equipped with a power unit for the pump, and full circulation spray bars adjustable laterally and vertically. Distributors shall be equipped with an automatic heater capable of maintaining the asphalt emulsion at the manufacturer’s recommended applicati on temperature or at 140 °F , whichever is higher.
2.A rotary power broom.
3.A minimum of two pneumatic tire rollers that weigh at least 10 tons each.
4.One self -propelled aggregate spreader of approved design supported by at least four wheels equipped with pneumatic tires on two axles. The aggregate spreader shall be capable of applying the larger cover coat material to the surface ahead of the smaller cover coat material and shall have positive controls, so the required quantity of material is deposited uniformly over the full width of the asphalt emulsion. Other types of aggregate spreaders may be used provided they accomplish equivalent results and are approved.
Source: Colorado Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 371–372 of 943.