CONSTRUCTION SPECIFICATION FOR RUBBLIZING CONCRETE PAVEMENT AND CONCRETE BASE

Transcription

1 ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 361 NOVEMBER 2011 CONSTRUCTION SPECIFICATION FOR RUBBLIZING CONCRETE PAVEMENT AND CONCRETE BASE TABLE OF CONTENTS SCOPE REFERENCES DEFINITIONS DESIGN AND SUBMISSION REQUIREMENTS - Not Used MATERIALS EQUIPMENT CONSTRUCTION QUALITY ASSURANCE - Not Used MEASUREMENT FOR PAYMENT BASIS OF PAYMENT APPENDICES 361-A Commentary SCOPE This specification covers the requirements for in-place rubblizing of concrete pavement or concrete base and compaction of the rubblized 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: 11/2011 OPSS 361

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 provincialoriented 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 municipaloriented 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 Specification, Construction OPSS 501 Compacting Ontario Provincial Standard Specification, Material OPSS 1010 Aggregates - Base, Subbase, Select Subgrade, and Backfill Material DEFINITIONS For the purpose of this specification, the following definitions apply: Concrete Base means a rigid pavement structure that is overlaid with asphaltic concrete on the same Contract and may include concrete shoulders. Concrete Pavement means a rigid pavement structure with an exposed concrete surface that may include concrete shoulders. Page 2 Rev. Date: 11/2011 OPSS 361

3 Rubblizing means the thorough fracturing of plain or reinforced concrete slabs with or without dowels to produce an in-place material for use as a base or subbase MATERIAL Granular A Granular A shall be according to OPSS EQUIPMENT Rubblizing The rubblizing equipment shall be a self-contained, self-propelled, resonant frequency pavementbreaking unit capable of producing high frequency, low amplitude blows with a minimum impact energy of 8,000 Newtons at a rate of not less than 44 impacts per second. The equipment shall be capable of rubblizing concrete pavement and concrete base in-place. The compactor shall be a self-propelled, vibratory, single smooth steel drum grade roller with a minimum weight of 9,200 kg. The equipment shall apply water for dust suppression, as required CONSTRUCTION Operational Constraints All new and existing pavement drainage systems shall be fully operational for two weeks prior to rubblizing. Prior to rubblizing, adequate lateral support shall be provided against the existing concrete slab, either by the existing or the new granular shoulders or base. All overlying bituminous material shall be fully removed prior to rubblizing. Only construction traffic shall be permitted on the rubblized surface. Construction traffic shall be limited on the rubblized surface, and the compacted condition of the rubblized pavement shall be maintained prior to placing the overlying material. The rubblizing operation shall not damage exposed road appurtenances and fixtures. A full depth saw cut shall be made along an existing joint at all ramps and mainline pavement where rubblized concrete abuts pavement that is to remain in place. All dowels between the planned rubblizing and concrete pavement to remain in place shall be severed. In areas where the roadway is to be overlaid with hot mix asphalt one lane at a time, rubblizing shall extend a minimum of 15 cm beyond the edge of pavement to be overlaid Compaction of Granular A Compaction of Granular A shall be according to OPSS 501. Page 3 Rev. Date: 11/2011 OPSS 361

4 Gradation Requirement for Rubblized Concrete The rubblized concrete shall meet the following gradation requirements: a) No particles shall exceed 150 mm in the largest dimension. b) A maximum of 10%, by mass, shall pass the 75 µm sieve. Any pieces of rubblized concrete greater than 150 mm shall be removed or reduced to an acceptable size. The resulting void shall be replaced with compacted Granular A material Test Section The proposed rubblizing operation shall be demonstrated by the Contractor over a 100 m full width test section. The test section location shall be subject to the approval of the Contract Administrator. The resultant rubblized concrete shall meet the specified requirements. When the rubblizing operation does not conform to the specification, appropriate adjustments shall be made to the operation to ensure conformance to the specification and an additional test section shall be performed Compaction and Proof Rolling The rubblized concrete shall be compacted with a minimum of two passes, each pass being up and back, of the self-propelled, vibratory, single smooth steel drum grade roller. The roller shall be operated at a speed not exceeding 5 km/h. Where deflections and associated movement of the rubblized concrete surface are apparent, remedial action shall be taken as directed by the Contract Administrator Sampling A minimum of one sample per day of production shall be taken on a random basis by the Contractor at locations determined by the Contract Administrator. The sample size shall be a minimum of one square metre for the full depth of the rubblized concrete, including the embedded steel. The sampling frequency may be reduced at the discretion of the Contract Administrator. The removed rubblized material shall be visibly inspected by the Contract Administrator for conformance to the specification. After sampling, the sampled area shall be backfilled and compacted with Granular A material Embedded Steel All embedded steel reinforcement in the rubblized concrete shall be left in place. Where reinforcement is present, the bond between the concrete and the reinforcement shall be broken. Any steel exposed or protruding above the surface shall be cut off flush with the surface and removed from the site Management of Excess Material Management of excess material shall be according to the Contract Documents. Page 4 Rev. Date: 11/2011 OPSS 361

5 MEASUREMENT FOR PAYMENT Actual Measurement Rubblizing of Concrete Pavement Rubblizing of Concrete Base Measurement of rubblizing of concrete pavement and concrete base shall be by area in square metres Plan Quantity Payment When measurement is by Plan Quantity, such measurement shall be based on the units shown in the clause under Actual Measurement BASIS OF PAYMENT Rubblizing of Concrete Pavement - Item Rubblizing of Concrete Base - Item Payment at the Contract price for the above tender items shall be full compensation for all labour, Equipment, and Material to do the work. Asphalt removal shall be paid for under a separate item. Page 5 Rev. Date: 11/2011 OPSS 361

6 Appendix 361-A, November 2011 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 Other concrete pavement rehabilitation treatments should be considered prior to specifying rubblizing. For effective rubblizing, the concrete slab shall be free of delamination and material deterioration. This specification is written as a method specification identifying a unique process incorporating a resonant frequency pavement breaker. Gradation control of the final product is based on visual assessment of the rubblized material. When greater gradation control is required of the final product, full depth removal of the concrete pavement and off-site crushing is recommended. All overlying bituminous material shall be fully removed prior to rubblizing. Payment for removal of bituminous material shall be under separate items. The designer should ensure that areas previously repaired with full depth asphalt are removed to ensure uniform performance of the rubblized material. Proper subgrade support for the rubblizing operation shall be assessed during precontract engineering. Granular A material for backfill purposes may be substituted with an alternate crushed granular material. When paving directly on the rubblized surface, a hot mix asphalt levelling course is recommended. If an alternate material is required, this must be indicated in the Contract Documents. The designer should identify the thickness of the concrete slab to be rubblized and identify the type of embedded steel in the concrete slab. Pavement drainage systems including ditch, sub-drains, and outlets are to be staged so that they are installed and operational prior to rubblizing operations beginning. Operations should be staged so that the lateral pavement edge support remains in place until the rubblizing operations are completed. This is to ensure that the maximum impact energy is transferred to the concrete slab. Since only construction traffic is permitted on the rubblized surface, traffic staging should be shown in the Contract Documents. 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 6 Rev. Date: 11/2011 OPSS 361