261 SECTION 503 SEALING CRACKS IN CONCRETE PAVEMENT
503.1 -DESCRIPTION : This work shall consist of the cleaning and sealing of cracks in concrete pavemen t in the manner and subject to the conditions and regulation prescribed. The location of the cracks to be sealed shall be shown on the plans or as directed by the Engineer.
503.2 -MATERIALS : The crack sealant material shall be in accordance with Section 708.3. The filler or back -up material shall be in accordance with Section 708.4.2, shall meet the requirements of the Sealant Manufact urer, and shall be appropriate for outdoor applications.
CONSTRUCTION METHODS
Old filler and foreign material in the cracks shall be removed. The cracks shall then be sealed as prescribed. Other means and/or methods recommended by the Sealant Manufacturer and approved by the Engineer may be used.
503.3: Blank
503.4 -PREPARATION OF MATERIAL BEFORE USE : Before charging the compound into the melting unit, the unit shall be free from all foreign material. If the type of heater to be used requires that the sealing material as shipped, be cut into smaller pieces before melting, the method used is subject t o approval by the Engineer. The heating kettle used for melting sealing materials shall be of the indirect heating or double boiler type, using oil as the heat transfer medium. It shall have a thermostatically controlled heat source, a built -in automatic agitator, and thermometers installed to indicate both the temperature of the melted sealing material and that of the oil bath. Other methods of indirect heating approved by the Engineer may be used. A positive means of controlling the temperature of the heat transfer medium at all points in the system shall be incorporated in the heater. Sealing material shall be uniformly heated until the pouring temperature recommended by the Sealant Manufacturer is reached. Should the maximum recommended pouring tem perature be exceeded, the material will be rejected. The material shall be poured as soon as possible after the pouring temperature is reached. Only sufficient material for the day’s operation shall be heated each day. Other means and/or methods recomme nded by the Sealant Manufacturer and approved by the Engineer may be used.
503.5 -PREPARATION OF CRACKS FOR SEALING : Cracks should be widened with a saw to a minimum width of ½ inch and to a depth necessary to provide a 1:1 width to depth ratio including room for the backing material, if necessary. Cracks greater than ½ inch width, do not require saw cutting. Unless otherwise noted, sealing concrete pavement joints shall be applied as outlined in Section 510 and cracks greater than one ( 1) inch width shall be repaired as outlined in Section 507. The cracks shall be thoroughly cleaned of all loose scale, dirt, dust, other foreign matter, old sealant and loosely stuck par ticles of mortar and aggregate, so that dry, sound, and clean surfaces result. The use of any tool which results in damage to the pavement is prohibited. Just
262 prior to the actual sealing operation, the crack shall be thoroughly blown out with an air jet having sufficient volume and pressure to remove any loose material left by the cleaning operation. After the final cleaning, the backing material, if necessary, shall be inserted into the crack in accordance with the Manufacturer’s recommendations to prov ide the correct shape factor for the sealant.
503.6 -EQUIPMENT FOR APPLYING SEALER : The equipment used for the placing of sealing material in the cracks may consist of conventional hand pouring pots, individual mechanical pouring kettles mounted on wheels with a pouring shoe, or heating units from which material may be discharged into the crack through the use of flexible lines and suitable shoes. Any heat, which it may be necessary to apply to sealing material after it leaves the main heating unit, shall be applied by indirect and controlled methods as specified in subsection 503.4. No direct heat will be permitted on the pouring unit in order to meet field controls set forth below. Any method of placing sealing material, which results in compliance with the following requirements, will be satisfactory.
503.7 -PLACEMENT REQUIREMENTS : The crack shall be sealed in accordance with the Sealant Manufacturer’s recommendations. At the time of sealing, the crack faces shall be dry and dust free. The sealant shall be in troduced into the crack in a continuous uniform operation to properly fill and seal the crack from the bottom upward in order to avoid trapping any air bubbles. The crack shall be sealed to within 1/8 to ¼ inch below the pavement surface. Traffic shall n ot be allowed on the sealed joint for the minimum time recommended by the Sealant Manufacturer after placement, unless otherwise approved by the Engineer. Sealant shall never be applied to frozen, dirty, wet, or damp concrete or during inclement weather c onditions. Sealant shall not be placed in the cracks unless the temperature of the pavement is 40° F or higher unless approved by the Engineer.
503.8 -METHOD OF MEASUREMENT : The qua ntity of work done will be measured in linear feet of “Sealing Cracks”, when the item below is included in the contract.
503.9 -BASIS OF PAYMENT : The quantity of work, as described above, will be paid for at the contract unit price bid for the item below, which price and payment shall be full compensation for furnishing all the materials and doing all the work prescribed in an acceptable manner, including all the labor, tools, equipment, su pplies, and incidental items necessary to complete the work.
503.10PAY ITEM :
ITEM DESCRIPTION UNIT 503001 -* Sealing Cracks in Concrete Pavement Linear Foot
* Sequence number
263 SECTION 506 CONCRETE PAVEMENT REPAIR
506.1 -DESCRIPTION : This work consists of the removal and replacement of deteriorated concrete pavement and patches, and replacing subbase material where required, at locations as shown on plans or as specified by the Engineer. The following is a description of each patch type:
Patching shall consist of full depth, full lane width concrete pavement repairs equal to or greater than four ( 4) feet in length. Type I patches shall constructed in accordance with the Concrete Repair Details in the plans. ii. Jointed Concrete Pavement Patch, Type II: Patching shall consist of partial depth concrete pavement repairs that extend a minimum of two ( 2) inches and no deeper than one -half the slab thickness at cracks or no more than one -third the slab thickness at doweled joints. Type II patches shall be constructed in accordance with the Concrete Repair Details in the plans. iii. Jointed Concrete Pavement Patch, Type III: Patching shall consist of a repair along the edge of a transverse crack or joint that extends from the bottom of a partial depth repair (Type II) to potentially the full depth of the slab, and isolated within twelve ( 12) inches of either the longitudinal joint or pavement edge. Type III patches shall be constructed in accordance with the C oncrete Repair Details in the plans.
506.2 -MATERIALS : Materials shall meet the requirements of section 501 or 601, and as follows:
MATERIAL SECTION OR SUBSECTION Accelerating Admixtures 707.13 Curing Materials 707.6 -707.10 Epoxy -Coated Dowel Bars 709.15 Joint Sealer 708.3, 708.4 Portland Cement Concrete 501 or 601 Subbase 307 Tie Bars and Hook Bolts 709.1
A non -shrink cementitious grout meeting the requirements of ASTM C1107 or an approved epoxy adhesive meeting the requirements of AASHTO M 235, Type IV, Grade 3, Class B or C shall be used to firmly anchor dowel bars in 30 minutes. This material shall be approved by the Engineer for the intended application. Cement meeting the requirements of ASTM C150, Type III may be used in the concrete mixes for concrete pavement repair.
506.3 -PROPORTIONING : Portland cement concrete for patching concrete pavement shall meet the requirements of Section 501, or Class B or Modified Class B as specified in Section 601, except that it shall be shown by compressive strength tests, in the approved mix design, that th e concrete mix shall attain