CONSTRUCTION SPECIFICATION FOR FULL DEPTH REPAIR OF CONCRETE PAVEMENT OR CONCRETE BASE

Transcription

1 ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 360 NOVEMBER 2015 CONSTRUCTION SPECIFICATION FOR FULL DEPTH REPAIR OF CONCRETE PAVEMENT OR CONCRETE BASE TABLE OF CONTENTS SCOPE REFERENCES DEFINITIONS DESIGN AND SUBMISSION REQUIREMENTS - Not Used MATERIALS EQUIPMENT CONSTRUCTION QUALITY ASSURANCE MEASUREMENT FOR PAYMENT BASIS OF PAYMENT APPENDICES 360-A Commentary SCOPE This specification describes the requirements for full depth repair of concrete pavement or concrete base including sawcutting; removal of pavement; installation of epoxy coated tie bars, dowel bars and load transfer devices; forming joints; and placing, texturing and curing of the concrete Specification Significance and Use This specification has been developed for use in provincial and municipal-oriented Contracts. The administration, testing, and payment policies, procedures, and practices reflected in this specification correspond to those used by many municipalities and the Ontario Ministry of Transportation. Use of this specification or any other specification shall be according to the Contract Documents. Page 1 Rev. Date: 11/2015 OPSS 360

2 Appendices Significance and Use Appendices are not for use in provincial contracts as they are developed for municipal use, and then, only when invoked by the Owner. Appendices are developed for the Owner s use only. Inclusion of an appendix as part of the Contract Documents is solely at the discretion of the Owner. Appendices are not a mandatory part of this specification and only become part of the Contract Documents as the Owner invokes them. Invoking a particular appendix does not obligate an Owner to use all available appendices. Only invoked appendices form part of the Contract Documents. The decision to use any appendix is determined by an Owner after considering their contract requirements and their administrative, payment, and testing procedures, policies, and practices. Depending on these considerations, an Owner may not wish to invoke some or any of the available appendices REFERENCES When the Contract Documents indicate that provincial-oriented specifications are to be used and there is a provincial-oriented specification of the same number as those listed below, references within this specification to an OPSS shall be deemed to mean OPSS.PROV, unless use of a municipal-oriented specification is specified in the Contract Documents. When there is not a corresponding provincial-oriented specification, the references below shall be considered to be to the OPSS listed, unless use of a municipal-oriented specification is specified in the Contract Documents. When the Contract Documents indicate that municipal-oriented specifications are to be used and there is a municipal-oriented specification of the same number as those listed below, references within this specification to an OPSS shall be deemed to mean OPSS.MUNI, unless use of a provincial-oriented specification is specified in the Contract Documents. When there is not a corresponding municipal-oriented specification, the references below shall be considered to be the OPSS listed, unless use of a provincial-oriented specification is specified in the Contract Documents. This specification refers to the following standards, specifications or publications: Ontario Provincial Standard Specifications, Construction OPSS 350 Concrete Pavement, Concrete Base and Lean Concrete Base Ontario Provincial Standard Specifications, Materials OPSS 1002 Aggregates - Concrete DEFINITIONS For the purpose of this specification the following definitions shall apply: Staged Repair means where an area cannot be repaired completely due to traffic or construction sequence requirements, the repair shall be completed in separate stages. Each stage shall be a minimum of one lane in width and 2 m in length. Page 2 Rev. Date: 11/2015 OPSS 360

3 Diamond Grinding means altering the profile and texture of a concrete pavement surface by utilizing grinding equipment that employs diamond blades MATERIALS Epoxy Resins Epoxy resins shall be as specified in the Contract Documents Concrete Concrete for full depth repair of concrete pavement or concrete base shall be according to the Materials section of OPSS 350 except that the nominal maximum size of coarse aggregate can be less than 37.5 mm according to OPSS The class of concrete shall be nominal minimum 28-day compressive strength of 30 MPa EQUIPMENT General Equipment for full depth repair of concrete pavement or concrete base shall be according to the Equipment section of OPSS Placing and Finishing Equipment Equipment used for placing, consolidating and finishing concrete shall be a self-propelled, vibratory steel screed or steel cylinder screed with integral internal vibration including automatic shut-off, levelling auger and shall operate on fixed forms. For repair areas less than 10 m in length, the concrete may be placed with a vibratory steel screed Gang Drill The gang drill shall consist of not less than three independently powered pneumatic drills. Drilling equipment shall be used in such a way so as not to damage the adjacent pavement CONSTRUCTION Staged Repair When the operation requires a staged repair, additional dowel bars shall be installed to connect the repair stages, as required Concrete Removal The outer limits of the concrete removal shall be saw cut full depth. The concrete removal method shall ensure that the concrete to be removed is not broken in place and that the adjoining concrete and underlying base remains undisturbed. When the existing granular base is disturbed, the loosened material shall be removed, the surface compacted and replaced with an additional depth of concrete. Page 3 Rev. Date: 11/2015 OPSS 360

4 Preparation Work The preparation work for full depth repair of concrete pavement or concrete base shall be according to OPSS Joints Joints for full depth repair of concrete pavement or concrete base shall be according to OPSS Dowel Bar and Tie Bar Placement Gang drills shall be used to drill holes in the existing concrete for insertion of the dowel bars or tie bars. Drill holes shall be thoroughly cleaned. The dowel bars or tie bars shall be secured into the existing concrete with epoxy resin. The epoxy resin shall be injected into the back of the cleaned drill hole and the dowel or tie bar, with grout retention disks attached, shall be inserted to ensure the bars are completely enveloped with epoxy resin Tie Bars Tie bars shall be installed at all longitudinal joints as specified in the Contract Documents Dowel Bars at Transverse Joints Dowel bars shall be installed at all transverse joints as specified in the Contract Documents. The tolerance for the alignment of dowel bars shall be 6 mm in the length of the dowel bar in both the vertical and horizontal planes of the pavement. When reinforcement is present, dowels may be adjusted 25 mm horizontally, and raised or lowered 10 mm, to avoid drilling the reinforcement Transverse Joints - Expansion Expansion joints shall be placed when replacing existing expansion joints or as specified in the Contract Documents Transverse Joints - Contraction Transverse contraction joints shall be cut or formed to match existing joints or working cracks and skewed if required. Dowels or load transfer devices shall be installed at mid depth of the concrete slab, in a plane with the pavement surface and parallel to the centreline of the road Concreting General Concreting for full depth repair of concrete pavement or concrete base shall be according to OPSS Placing Concrete Before placing concrete, it shall be demonstrated that the equipment to be used provides for proper adjustment of screeds, floats, propulsion and control equipment. Concrete shall be placed at or near its permanent location, at a steady rate and in such a manner to avoid segregation of the materials. Any concrete placed beyond the outer limits of the pavement edge shall be removed immediately. Page 4 Rev. Date: 11/2015 OPSS 360

5 Concrete shall be placed to avoid disturbing or displacing the load transfer devices. When an interruption in placing concrete of more than 45 minutes occurs, a transverse construction joint shall be formed. Concrete shall not be placed against any material which is at a temperature above 35 C or against any material which is at a temperature below 0 C Texturing of Surface Texturing of the surface shall be according to OPSS 350 except that manual devices may be used to provide the required tined texture. Texturing is not required on concrete base or when the concrete surface shall be diamond ground as specified elsewhere in the contract Surface Tolerance The surface of the concrete repair shall join flush with the existing concrete pavement or concrete base Curing, Joint Sealing, Removal of Forms and Shoulders Curing, joint sealing and shoulders for full depth repair of concrete pavement or concrete base shall be according to OPSS Miscellaneous Protection Miscellaneous protection for full depth repair of concrete pavement or concrete base shall be according to OPSS 350 except that the last sentence of the Traffic clause shall not apply Traffic For early opening determination, one set of cylinders shall be taken from the last placement of concrete in the section to be opened to traffic Sampling and Testing - Slump, Air Content and Compressive Strength Sampling and testing for full depth repair of concrete pavement or concrete base shall be according to OPSS 350 except that the compressive strength requirement shall be based on testing of standard cylinders with a frequency of one set of two cylinders 150 X 300mm (or one set of three cylinders 100 X 200mm) for each fifteen cubic metre unit of concrete but not less than one set of cylinders per Day Removal of Unacceptable Concrete Concrete found to be unacceptable shall be removed and replaced with new material Management of Excess Material Management of excess material shall be according to the Contract Documents. Page 5 Rev. Date: 11/2015 OPSS 360

6 QUALITY ASSURANCE Criteria for Determining Unacceptable Concrete If the tests on cylinders do not show a nominal minimum 28-day compressive strength of 30 MPa, the area represented by the cylinders shall be removed and replaced MEASUREMENT FOR PAYMENT Actual Measurement Full Depth Concrete Slab Repair Measurement shall be of the surface area of the concrete repair placed in square metres Plan Quantity Measurement Full Depth Concrete Slab Repair When measurement is by Plan Quantity, such measurement shall be based on the units shown in the clause under Actual Measurement BASIS OF PAYMENT Full Depth Concrete Slab Repair - Item Payment at the Contract price for the above tender item shall be full compensation for all labour, Equipment, and Material to do the work including dowel bars, tie bars and load transfer devices. Where the existing granular base is disturbed, the removal of loosened material, compaction of the surface, and replacement with an additional depth of concrete shall be at no extra cost to the Owner. The removal and replacement of unacceptable concrete shall be at no extra cost to the Owner. Page 6 Rev. Date: 11/2015 OPSS 360

7 Appendix 360-A, November 2015 FOR USE WHILE DESIGNING MUNICIPAL CONTRACTS Note: This is a non-mandatory Commentary Appendix intended to provide information to a designer, during the design stage of a contract, on the use of the OPS specification in a municipal contract. This appendix does not form part of the standard specification. Actions and considerations discussed in this appendix are for information purposes only and do not supersede an Owner s design decisions and methodology. Designer Action/Considerations The designer should specify the following in the Contract Documents: - Epoxy resins. ( ) - Tie bars. ( ) - Dowel Bars at Transverse Joints. ( ) - Transverse Joints - Expansion. ( ) The designer should ensure that the General Conditions of Contract and the 100 Series General Specifications are included in the Contract Documents. Related Ontario Provincial Standard Drawings No information provided here. Page 7 Rev. Date: 11/2015 OPSS 360

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