Specific Provisions – Cape Seal Specification

a. Description:

The work specified in this section consists of furnishing and applying multiple bituminous surface treatments composed of an asphalt emulsion chip seal followed by the application of asphalt emulsion micro-surface on a paved roadway or on a prepared road base, compacted to the lines, grades, and thickness established by the County and in substantial conformance with the limits established by the owner.

b. Materials:

I. Cover Aggregate for the Chip Seal:

Cover aggregate for the chip seal shall conform to FDOT specifications section 901, Table 1 for #89, #78 or #67 gradation for coarse aggregates except as modified under the Chip Seal Specification in this bid package. The aggregate shall be washed granite obtained from a source approved by the owner.

Sampling and testing of aggregate shall be the responsibility of the Contractor.

Copies of test results from the aggregate supplier shall be furnished to the County prior to the start of the surface treatment.

II. Aggregate for Micro-surface:

Use an aggregate consisting of 100% crushed stone. The aggregate shall be a crushed stone such as granite, slag, limestone, chat, or other high-quality aggregate, or a combination thereof, and conform to the Micro-surfacing Specification in this bid package.

a. High Performance Micro-surface Emulsion:

Provide a quick-traffic, polymer-modified emulsified asphalt conforming to the requirements specified in AASHTO M 208 for CSS-1EP. The product should meet the performance and technical criteria outlined in this bid package. Contractor may propose the project listed in Ergon Asphalt and Emulsion CSS-1EP Product Data Sheet OR submit an equivalent product alternative that meets all applicable test procedures, specifications, and mix design provided herein. See Attachment G in the bid package.

b. Mineral Filler:

If mineral filler is utilized in the micro-surface mix design, use non air-entrained Portland cement or hydrated lime that is free from lumps, consistent with the requirements of the Micro-surface Specification in this bid package.

c. Water:

Utilize water that is potable and free of harmful soluble salts, reactive chemicals, or any other contaminants.

d. Additives:

Additives may be added to the mixture or any of the component materials to provide control of quick-trafficking properties. The additives to be used should be indicated on the mix design and be compatible with the other components of the mix.

e. Crack Filler:

When required for the project, utilize a crack filler meeting the material requirements of the Crack Filling/Sealing Specification. Pre-treat any cracks in the pavement's surface with a crack filler meeting the requirements of FDOT Developmental Specification Section 305 prior to the application of the microsurfacing. Fill any cracks with a width greater than 1/4 inch. Do not overfill the cracks. Crack filling material must cure for a minimum of 14 days prior to application of the microsurfacing.

f. Material Samples:

The County will require the Contractor to sample and test each load of emulsion prior to delivery. The Contractor will also provide a sample of the emulsion, on site, prior to commencing work. The County will require the Contractor to provide sample containers and a local independent testing laboratory with no affiliation to the emulsion supplier for the analyzing of emulsion. The Contractor will be responsible for the cost of the testing. The County reserves the right to test any shipment of emulsion that is believed to be of substandard. All samples shall be shipped and stored in clean airtight sealed wide mouth jars or bottles made of plastic.

III. Equipment:

a. Asphalt Emulsion Distributor:

The liquid bituminous material shall be applied with a truck mounted, pressure distributor that has been calibrated within the previous twelve (12) months, for transverse and longitudinal application rate. The distributor shall be equipped, maintained and operated so that the bituminous material can be applied at controlled temperatures and rates from .035 to 1.5 gallons per square yard. The distributor shall be capable of applying bituminous material of variable widths up to sixteen (16) feet.

The distributor shall uniformly apply the bituminous material to the specified rate with a maximum allowed variation of 0.015 gallons per square yard. Distributor equipment shall include tachometer, accurate volume measuring device, a calibrated tank and a thermometer for measuring the temperature of the tank’s contents.

Distributors shall be equipped with a heating device, asphalt pump and full circulating spray bars adjustable laterally and vertically. Distributors and transport trailers shall be equipped with a sampling valve. Distributor trucks shall be of the pressure type with insulated tanks. The use of gravity distributors will not be permitted. The valves shall be operated by levers so that one or all valves may be quickly opened or closed in one operation. The valves which control the flow from nozzles shall act positively so as to provide a uniform unbroken spread of bituminous material on the surface. The distributor shall be equipped with devices and charts to provide for accurate and rapid determination and control of the amount of bituminous material being applied and with a bitumeter of the auxiliary wheel type registering speed in feet per minute, and trip and total distance in feet. Two distributor trucks will be required on all projects.

b. Aggregate Spreader:

The aggregate spreader shall be a self-propelled unit capable of uniformly spreading the aggregate at the required rate on a minimum width of six (6”) inches wider than the width of the lane to be treated. The spreader shall be calibrated within the previous twelve (12) months for transverse and longitudinal application.

The spreader shall be capable of extending to a width of 22 feet. The spreader shall be equipped with a computer-controlled aggregate/chip spreader in order to ensure the appropriate aggregate coverage at varying speeds, unless approved otherwise by Engineer.

c. Rollers:

The Contractor shall use one, ten (10) ton steel wheeled roller and two, eight (8) to twelve (12) ton self-propelled pneumatic tire rollers with oscillating wheels and low pressure, smooth tires. Maintain the inflation of the tires such that in no two tires the air pressure varies more than 5 psi. The rollers will be equipped with an operating water system and coco pads. A sufficient number of rollers and a sufficient number of passes shall be used to ensure cover aggregate is properly rolled. The final passes of the rolling process shall be performed by a static steel wheel roller, which shall be operated without the vibrating function.

d. Self-Propelled Rotary Power Broom:

The self-propelled rotary broom shall be designed, equipped, maintained and operated so the pavement surface can be swept clean. The broom shall have an adjustment to control the downward pressure.

e. Mixing Equipment:

Use a machine specifically designed and manufactured to place micro surfacing consistent with the requirements of the microsurfacing specification of this bid package. Truck mounted and self-loading continuous machines are acceptable.

f. Spreading Equipment:

The spreading equipment should be a mechanical squeegee type equipped with flexible material in contact with the surface to prevent loss of the microsurfacing slurry from the distributing box. There should be a flexible rear strike-off which is adjustable in width and capable of producing a uniform surface its full width. For detailed requirements, refer to the microsurfacing specification of this bid package.

g. Additional equipment:

Additional equipment will be needed to complete the operations required by this technical provision. All equipment necessary for the successful completion of projects governed by this technical provision shall be included in the unit costs associated herein. Availability of quality assurance devices (such as a 10' straight edge) shall be the responsibility of the Contractor.

IV. Construction:

a. Layout:

The Contractor will be responsible for the string lining and lay out of the roadway prior to paving.

b. Weather and Seasonal limitations:

The surface treatment shall not be applied to a wet surface or when rain is occurring, or the threat of rain is present immediately before placement. The surface treatment shall not be applied when the surface or/and air temperature is less than 50 degrees Fahrenheit in the shade. If Relative humidity is between 75% and 80%, additional time may be required to allow the emulsion to set before the lane can be opened to traffic. Operations may not continue if the relative humidity is above 80%. When applying emulsions, the temperature of the surface shall be a minimum of 55°F, and no more than 140°F.

If an unexpected rainstorm ensues, sufficient aggregate should be spread to cover all of the applied binder. If possible, the road or lane should be closed to traffic and, if not, traffic should be kept to a minimum speed during this period by use of pilot vehicles. The amount of rolling should be reduced, if not completely ceased, while the aggregate is wet, to avoid binder emerging from the voids and be picked up on the wheels of the roller.

c. Preparation of Surface:

The chip seal material shall be placed on a firm unyielding prepared roadway. Any patching or crack sealing that the Contractor is also authorized to perform for the project should be done a minimum of 14 days prior to the chip seal application.

The Contractor shall be responsible for clipping back shoulders and removing overburden or any other vegetation or debris to ensure that the road is free of organic and deleterious material. The Contractor shall spray all cut back edges with a pre-emergent herbicide before and after treatment. The Contractor will be responsible for blowing or sweeping the road immediately ahead of the chip seal operation to make sure the road is free of loose aggregate and other debris, as well as sweeping and cleaning the streets after treatment. If, in the opinion of the Engineer, the hand cleaning is not sufficient then a self-propelled street sweeper shall be used.

All manhole and valve covers, inlets and other service entrances, etc., shall be protected from bituminous material by placing reinforced waterproof, all-purpose paper or other suitable material, approved by the Engineer.

Thermoplastic striping and pavement markings, raised pavement markers, and raised pavement marker adhesive shall be removed.

Micro-surfacing may be used as rut fill if so contracted for the specific project to level bumps, waves and corrugations.

d. Resident Notification In residential areas, the Contractor shall distribute by hand, a typed notice to all residences and businesses on the street to be treated. The notice will be delivered no more than 24 hours prior to the treatment of the road. The notice will have a County phone number that the residents may call to ask questions. The notice shall be of the door hanger type which secures to the door handle of each dwelling.

Unsecured notices will not be allowed. The Contractor shall also place the notice on the windshield of any parked cars on the street. Hand distribution of this notice will be considered incidental to the contract.

e. Traffic Control:

The Contractor shall furnish all necessary traffic control, barricades, signs and flagmen, to ensure the safety of the traveling public and to all working personnel.

Traffic shall not travel on fresh mix until rolling and blotting has been completed.

All traffic control shall be in accordance with the FDOT Roadway Design Standards, most current edition. M.O.T. and associated devices shall be checked daily and periodically throughout the project for compliance; and where adjustments or corrections are needed, prompt revisions shall be made.

The Contractor shall submit an M.O.T plan indicating all facets of traffic control for the project area. The MOT plan should be approved in writing by the County prior to commencing any work.

Traffic shall not be allowed on the roadway after placement of the chip seal for a minimum of two hours. During and after placement of the chip seal, pilot cars should escort traffic at a speed of 20 mph (30 kph) over the chip sealed surface for two to 24 hours. For collector roads, pilot cars will be required unless otherwise instructed by Inspection. Once all the loose aggregate is removed from the new chip seal surface, pilot cars are no longer needed.

f. Chip Seal Normal good practices shall be followed for the chip seal construction as outlined in the chip seal specification of this bid package.

Some of the more important construction procedures required are:

i.Calibration of the asphalt emulsion distributor with the use of proper nozzle size and single and spray bar height above the surface.

ii.Immediately after the asphalt emulsion has been applied, it shall be covered with the chips.

iii.Rolling should begin as soon as possible after the cover aggregate has been applied with pneumatic tired units preferred. The rolling should consist of a minimum of 3 coverages. After the initial rolling has been completed with pneumatic tired units, further rolling may be carried out with a 5 to 8 ton steel wheeled unit (optional). To avoid excessive chip crushing, only one complete coverage should be made.

The surface should be clean with the surface broomed prior to the application of any tack coat or microsurfacing to remove excess chips, dirt and other objectionable matter.

g. Microsurfacing Once the chip seal application has been allowed a minimum of two days to settle, the Contractor shall apply a double micro-surface 30-34 lbs/sy in two lift. Normal good practices shall be followed for the chip seal construction as outlined in the microsurfacing specification of this bid package.

Some of the more important or unique construction procedures required are:

i. Each microsurfacing unit to be used should be previously calibrated.

ii. Immediately prior to the placement of the microsurfacing seal, the surface shall be cleaned by power brooming.

iii. Microsurface may be used as rut fill to level dips in the pavement.

iv. Not less than seven days, nor more than four weeks after the chip application, the microsurface shall be applied.

v. The Cape Seal should not be opened to traffic until the microsurface seal has cured sufficiently so as to not exhibit pickup by the tires of regular traffic.

h. Pavement Striping and Markings:

As part of the Maintenance of Traffic, the Contractor shall provide the necessary temporary striping and pavement markings during the different construction phases, and maintained for a minimum of two (2) weeks following the completion of the chip seal operation.

Permanent striping and pavement markings, including the installation of reflective pavement markers shall be performed after the two (2) week period. Prior to applying the permanent striping and markings, the Contractor shall broom the roadway. The Contractor shall be responsible for maintaining the permanent striping and markings for a minimum of two (2) weeks after installation.

i. Deliverables:

Upon completion of the project, the Contractor shall provide Inspection with logs showing the daily and running totals of aggregate and bituminous material during the chip seal stage, as well as the daily production logs for the microsurfacing stage. These logs shall become backup documentation for invoicing.

j. Warranty:

The Contractor shall provide the County upon final acceptance of the Cape Seal work, a warranty period of three (3) years which shall include all labor, materials, hauling, traffic control and striping to repair the defective areas. Defective areas shall include debonding/delamination, bleeding, excessive raveling and aggregate loss. The Contractor shall perform all warranty work at no cost to the County.

k. General Performance:

Provide completed pavement which performs to the satisfaction of the engineer without bleeding, rutting, shoving, raveling, stripping, or showing other types of pavement distress or unsatisfactory performance.

V. Method of Measurement:

If a pay item is listed on the Bid Form for work required in this provision, the quantity to be paid shall be as specified in the Bid Form including all items of work described herein. Any item necessary for Cape Seal and not specifically listed in another item in the Bid Form, shall be included in this item.

VI. Basis of Payment:

The Contract Unit Prices shall constitute full compensation for furnishing all labor, materials, equipment, tools, supervision, transportation, incidentals, overhead, profit, and all other costs necessary to complete the work in accordance with the Contract Documents, including the Terms and Conditions, General Conditions, Supplemental Specifications, and all requirements pertaining to Cape Seal operations as specified herein. No separate or additional compensation shall be allowed for any work, materials, equipment, operations, or incidental items required to satisfactorily complete the work described in the Contract Documents, unless such work is expressly authorized in writing by the County as additional or extra work in accordance with the applicable provisions of the Contract.