Withdrawn. NRA Interim Advice Note 08/13. Specification and Notes for Guidance on the Use of Permanent Repair Material Systems.

Transcription

1 October 2013 NRA Interim Advice Note 08/13 Specification and Notes for Guidance on the Use of Permanent Repair Material Systems Withdrawn St. Martin s House, Waterloo Road, Dublin 4 Tel: Fax infodmrb@nra.ie Web:

2 Summary: This NRA Interim Advice Note 08/13 (NRA IAN 08/13) sets out the specification and notes for guidance to the specification on the use of Permanent Repair Material Systems (PMRS). NRA IAN 08/13 shall be read in conjunction with all parts of the NRA Manual of Contract Documents for Road Works for Series 900, Road Pavements Bituminous Bound Materials, NRA IAN 06/13 Procedures for Use of Permanent Repair Material Systems on National Roads and NRA IAN 07/13 Monitoring Phase Procedures for Permanent Repair Material Systems. Published by National Roads Authority, Dublin 2013

3 NRA Interim Advice Note 08/13 Specification and Notes for Guidance on the Use of Permanent Repair Material Systems Contents Chapters 1. Introduction to NRA IAN 08/13 2. Specification for Use of Permanent Repair Material Systems 3. Notes for Guidance on the Specification for Use of Permanent Repair Material Systems 4. References 5. Enquiries October 2013

4 1. INTRODUCTION TO NRA IAN 08/13 This NRA Interim Advice Note 08/13 (NRA IAN 08/13) covers the specification and notes for guidance to the specification on the Use of Permanent Repair Material Systems. NRA IAN 08/13 shall be read in conjunction with all parts of the NRA Manual of Contract Documents for Road Works for Series 900, Road Pavements Bituminous Bound Materials, NRA IAN 06/13 Procedures for Use of Permanent Repair Material Systems on National Roads and NRA IAN 07/13 Monitoring Phase Procedures for Permanent Repair Material Systems. This NRA IAN 08/13 includes a specification under development and has been prepared as Clause 946 of the NRA Manual of Contract Documents for Road Works for Series 900, Road Pavements Bituminous Bound Materials. NRA IAN 08/13 shall be used in conjunction with all relevant parts of the NRA DMRB and NRA MCDRW. October

5 2. SPECIFICATION FOR USE OF PERMANENT REPAIR MATERIAL SYSTEMS General Permanent Repair Material Systems (PRMS) shall be used for the permanent repair of surface defects, filling of road stud cavities and core holes, filling around ironworks, trench reinstatements and utility cuttings/openings in National Roads. The PRMS is intended to provide satisfactory levels of carriageway operation compatible with the lifetime of the surrounding carriageway The two permitted Permanent Repair Material Systems shall be as follows: (i) Permanent Repair Material as defined in sub-clause (ii) Localised Surface Repair as defined in sub-clause PRMS may be proprietary products. However any such products shall be required to comply with the requirements of NRA IAN 08/13. Permanent Repair Material Permanent Repair Material shall be defined as follows: Permanent Repair Material is a cold-lay bituminous material which shall provide a permanent repair to surface defects, road stud cavities and core holes, filling around ironworks, trench reinstatements and utility cuttings/openings. It shall conform to the requirements of NRA IAN 08/ In accordance with sub-clause 901.2, Permanent Repair Material shall be produced in plants that are independently accredited to ISO 9001 or an equivalent quality management system. Localised Surface Repair Localised Surface Repair shall be defined as follows: A Localised Surface Repair is an infra-red process that reconstitutes the surfacing material insitu to provide a permanent repair and which conforms to the requirements of NRA IAN 08/ If specified by the system installer, Permanent Repair Material (as defined in sub-clause 946.3) may be used in Localised Surface Repair works to supplement the in-situ material such that the repair conforms to NRA IAN 08/13. Where supplementary materials are used the visual consistency of the existing surface course shall be maintained. October

6 Trench Reinstatements When proposing to use Permanent Repair Material, as defined in sub-clause 946.3, for trench reinstatements, the reinstatement method requirements of the NRA Specification for Openings in National Roads shall also be complied with. Reinstatement of core holes Reinstatement of core holes using Permanent Repair Material as defined in sub-clause shall be carried out in accordance with BS Clause Aggregate The coarse aggregate shall consist of crushed rock complying with sub-clause Resistance to Fragmentation (Hardness) of the coarse aggregate shall comply with the requirements of sub-clause The fine aggregate shall comply with the requirements of IS EN Unless otherwise specified in Appendix 7/1 and in accordance with IS EN Clause and SR17 Section 3.3.2, the aggregate shall conform to a minimum PSV 60 declared Acceptability of the polished stone value of an aggregate shall be in accordance with sub-clause Unless specified in Appendix 7/1, the aggregate shall conform to category AAV 10 in accordance with IS EN Clause and SR17 Section Filler Added filler shall be in accordance with IS EN Added filler shall include crushed rock, crushed slag, hydrated lime, cement (CEM I or CEM II complying with IS EN 197-1). Reclaimed Asphalt Unless re-used directly on site during Localised Surface Repair works, as defined in sub-clause 946.5, reclaimed asphalt shall not be used. Mixture Requirements Laboratory prepared test specimens of Permanent Repair Materials shall conform to the requirements of sub-clauses , , and All testing shall be carried out in an INAB-accredited laboratory, or similar approved. October

7 All samples of Permanent Repair Materials shall be pre-conditioned in accordance with the product manufacturer s requirements. Skid Resistance In addition to sub-clause , laboratory testing to determine the friction after polishing shall be carried out in accordance with draft standard IS EN using an appropriate apparatus (e.g. the Wehner-Schulze apparatus). Refer to Annex A of IAN 05/13 for further details. Upon successful testing in accordance with this standard, the results achieved shall be recorded and notified to the Employer s Representative in accordance with record keeping procedures outlined in Chapter 3 of NRA IAN 08/13. Air Void Content The Air Void Content shall be determined in accordance with IS EN and comply with the requirements shown in Table 9/39. Samples used to determine the Air Void Content shall firstly be compacted in accordance with IS EN Maximum density shall be measured in accordance with IS EN Procedure A Volumetric Procedure and bulk density shall be measured in accordance with IS EN Procedure C Sealed specimen. Table 9/39 Air Voids Content Requirements Permitted Air Voids Material Carriageways Footways Max % Min % Max % Min % Permanent Repair Material Water Sensitivity The Water Sensitivity shall be determined in accordance with IS EN and expressed as the Indirect Tensile Strength Ratio (ITSR). The ITSR shall be determined in accordance with IS EN The ITSR shall be calculated as the ratio of the indirect tensile strength of wet (water conditioned) specimens to that of dry specimens, expressed in percent. Water sensitivity of the mixture shall be ITSR 80. Testing shall be conducted at a temperature of 25 C. Resistance to Permanent Deformation The resistance to permanent deformation shall be determined in accordance with IS EN and comply with Table 9/40. Tests shall be carried out on material specimens using the small wheel tracking device on 305 mm square slabs which shall be compacted by a laboratory roller compactor in accordance with IS EN October

8 Table 9/40 Wheel Tracking requirements for site classifications Test Category Category temperature No. 1 2 Classification Description Moderate to heavily stressed sites requiring high rut resistance Very heavily stressed sites requiring very high rut resistance Test method o C WTS AIR IS EN , Small device, Procedure B Wheel track slope (μm/cycle) WTS AIR DECLARED WTS AIR DECLARED PRD AIR IS EN , Small device, Procedure B Proportional rut depth (mm) PRD AIR DECLARED PRD AIR DECLARED Requirements when tested to BS Max rut rate (mm/hr) Max rut depth (mm) Other sites N/A WTS AIR NR PRD AIR NR - - Notes: 1. The values for WTS AIR and PRD AIR categories in Table 9/41 shall be declared until experience with the test methods has been established in Ireland. It is therefore recommended that the test method described in BS be used in conjunction with the EN method, and that the results be correlated with results obtained on the same mixtures. 2. The values given in Table 9/41 for the British Standard method should be used until an acceptable correlation has been established. Preparation The product manufacturer and/or system installer shall submit a method statement to the Employer s Representative prior to the works commencing which shall comply with sub-clause The works shall only proceed once the method statement has been approved by the Employer s Representative For both systems defined in sub-clause 946.2, diamond patches shall be the preferred repair shape for heavily trafficked roads in accordance with BS The requirement for diamond patches shall not apply for trench reinstatements Preparation for works using Permanent Repair Material, as defined in sub-clause 946.3, shall meet the following requirements: (i) The area to be treated shall be marked out and joints shall be saw cut vertically to a depth such that sound material can be determined. If the repair extends into two or more pavement layers; parallel joints shall be offset be in accordance with sub-clause (ii) The repair area shall be swept free of all loose material, oil, grease, ice, and any other contaminants. The surface as a whole shall be dry and any damp areas shall be completely free of standing water. October

9 (iii) A spray-applied primer as specified by the product manufacturer shall be used to seal the base and vertical edges of the repair area. The applicator to be used, the rate of spread of the material and the allowed curing time shall be specified by the product manufacturer Preparation for works using Localised Surface Repair, as defined in sub-clause 946.6, shall meet the following requirements: (i) The existing surface to be treated shall be heated using infra-red equipment to a temperature specified by the system installer. The heat must penetrate to a depth within the existing pavement structure as specified by the system installer. (ii) A joint 100 mm inside the perimeter of the heated area shall be cut into the surface. (iii) The surface shall then be raked thoroughly to maximise the surface area of the exposed material. (iv) A bitumen emulsion rejuvenator, if specified by the system installer, shall be sprayapplied to the raked material. The bitumen emulsion rejuvenator shall be applied at a rate using an applicator, both of which shall be specified by the system installer. Installation Both systems, as defined in sub-clause 946.2, shall be installed solely by competent personnel Both systems, as defined in sub-clause 946.2, shall be installed within the weather parameter guidelines outlined by the product manufacturer/system installer Installation works involving Permanent Repair Material, as defined in sub-clause 946.3, shall meet the following requirements: (i) In accordance with the product manufacturer s requirements, material shall be laid in uniform lifts allowing for surcharge per lift such that compaction can be achieved Installation works involving Localised Surface Repair, as defined in sub-clause 946.5, shall meet the following requirements: (i) Permanent Repair Material shall be added to the repair area if so required in accordance with sub-clause (ii) When compaction in accordance with sub-clauses , , and is complete, a spray-applied bitumen preservative and surface dressing shall be applied to the compacted surface. While the requirement and specifications for these products shall be specified by the system installer, the surface dressing shall also comply with the PSV and texture depth requirements of NRA IAN 08/13. Compaction In the event that installation takes place in two or more lifts when using Permanent Repair Material, the compaction for each lift shall take into account material surcharge and the product manufacturer s and/or system installer s requirements Once the final lift is placed, compaction shall commence in accordance with the product manufacturer s and/or system installer s requirements Compaction shall cease before migration of binder to the surface or crushing of aggregates is observed. October

10 Once laid and compacted the finished surface shall be planar with the adjoining surface Upon completion of works compacted materials shall be capable of being wet flush cored. Completion of Permanent Repair Material System Works Measurements to determine the initial texture depth of the repair area shall be conducted before opening to traffic. Testing shall be conducted using the volumetric patch method described in IS EN and shall conform to the requirements of Table 9/41. Should the repair area not be of sufficient size to carry out the volumetric patch method test a previous test conducted by the product manufacturer and/or system installer on an appropriate sized repair area may be used a reference Once testing has been completed the system installer shall confirm in writing to the Employer s Representative that the works have been installed as per the product manufacturer s and/or system installer s requirements and the testing conducted meets the requirements of NRA IAN 08/ The time period between completion of works and opening to live traffic shall be determined by the product manufacturer s and/or system installer s requirements, and agreed with the Employer s Representative. Table 9/41 Requirements for Initial Texture Depth Road Type Measurement (min-max) All 1 1.2mm (including roundabouts) Permanent Repair Material System Performance In accordance with NRA IAN 07/13 when a PRMS is first installed the repair area shall undergo monitoring for seven days from the date of opening to traffic to determine the System s durability. Where the repair area contains no defects, the performance of the PRMS shall be deemed as suitable. The location and extent of any defects such as ravelling, bleeding, rutting, surface cracking and edge breakup or edge cracking of the repair area shall be noted. The repair area shall be deemed as unsuitable if any such defects are noted In accordance with NRA IAN 07/13 further visual inspections are carried out at specified intervals of 1 month, 3 months, 6 months and 12 months after opening to traffic. Where the repair area contains no defects, the performance of the PRMS shall be deemed as suitable. The location and extent of any defects such as ravelling, bleeding, rutting, surface cracking and edge breakup or edge cracking of the repair area shall be noted. The repair area shall be deemed as unsuitable if any such defects are noted. October

11 Providing previous inspections have not noted any defects, a final visual assessment shall be carried out by the product manufacturer/system installer and the Employer s Representative in accordance with NRA IAN 07/13, after one year in service. If no defects are noted, this inspection shall confirm that the Permanent Repair Material System is suitable for further use on the same National Route road type category upon which the assessed repair was installed. The road type category shall as defined in Table 9/42. If the PRMS is deemed to be suitable, the PRMS will also be deemed suitable for use on lower road type categories. Table 9/42 Categories of Road Type for monitoring of PRMS Road Type Category Annual Average Daily Flow (AADF) [Note 1] 0 > a b Notes: 1. AADF Figures shall be the Daily Flow of Commercial Vehicles at time of repair works. Categories above are for total flow in one direction Should the PRMS be deemed suitable in accordance with sub-clause any further repairs on the same or lower road type category shall not be required to undergo the requirements of NRA IAN 07/13. However the system shall continue to meet the testing and workmanship requirements of NRA IAN 08/ Should any defects be recorded in the repair area during the Monitoring Period, the PRMS shall be deemed not suitable and shall not be permitted for further use on the road type category of the National Roads network where the defect occurred or any higher road type categories. If subsequently proposed for use on a road category which is lower than where the defect occurred, the PRMS will be required to fully comply with NRA IAN 08/13. Further Installation of Permanent Repair Material Systems Subject to the approval of the National Roads Authority Head of Standards, further use of a PRMS that is undergoing monitoring in accordance with sub-clause on the National Roads network may be permitted in other locations. These locations shall be on a road type category, as defined in Table 9/42, which is the same or lower than the initial repair Use of PRMS under the conditions outlined in sub-clause shall only be permitted after the initial repair works has been carried out in accordance with NRA IAN 08/13 and monitored successfully for a three month period with the repair deemed suitable in compliance with the requirements of NRA IAN 07/ Until such time as the full requirements of NRA IAN 07/13 are met these further installations shall be undertaken at the risk of the product manufacturer and/or system installer. October

12 3. NOTES FOR GUIDANCE ON THE SPECIFICATION FOR USE OF PERMANENT REPAIR MATERIAL SYSTEMS Introduction This Specification for Permanent Repair Material Systems (PRMS) is not intended to be an exhaustive specification for the use of proprietary systems, but rather to form a set of minimum performance related requirements for product manufacturers and/or system installers. PRMS is intended as an option for use in the permanent repair of surface defects, patching, filling road stud cavities and core holes, filling around ironworks, trench reinstatements and utility cuttings/openings in National Roads. Surface defect repairs that may be appropriate for remedial treatment with PRMS include potholes, delamination, surface cracks, joint failures and previously patched areas. Designers should be aware that PRMS may not be suitable for treatment of extensive surface defects or defects within the unbound layers of the pavement structure. NG Given the requirements of sub-clause the maximum advised individual area of repair allowed using PRMS systems shall be approximately 2m 2. Quality Control Materials used for the installation of PRMS shall be supplied from locations that are independently accredited to ISO 9001 or equivalent quality management system. NG The minimum polished stone value of the coarse aggregate shall be in accordance with subclause NG The maximum aggregate abrasion value shall be in accordance with sub-clause Mixture Requirements The air void content, water sensitivity and deformation resistance of Permanent Repair Material shall conform to the requirements of NRA IAN 08/13. It is the responsibility of the product manufacturer to meet these requirements by having the required tests carried out testing in an INAB-accredited laboratory, or similar approved. These tests and tests conducted to determine the friction after polishing shall be carried out on samples of proposed Permanent Repair Material. Where the Permanent Repair Material mix is amended in any way additional tests conducted to determine the friction after polishing shall be carried out on the amended mix. Results of such testing shall be forwarded to the Employer s Representative prior to installation of the material on site. October

13 NG When specifying resistance to permanent deformation, it will be necessary to take into account the transitional problems brought about by the change in the wheel tracking test method from BS 598 Part 110 to IS EN , which uses similar equipment but different duration and loading. Further information is given in SR28. Work is in hand to establish criteria for the new method, but in the interim, requirements shall be based on the BS 598 test but with data provided to show the values for the same mix tested to the IS EN method. Surface Preparation, Transportation, Placement and Compaction Within the constraints of NRA IAN 08/13, the design, manufacture and installation of the PRMS are the responsibility of the product manufacturer/system installer. Record Keeping Prior to the commencement of works, copies of documentation relating to the PRMS shall be supplied to the Employer s Representative. Records submitted shall include details of materials proposed and laboratory test results. Copies of all documentation relating to the PRMS shall be supplied to the Employer s Representative at the time of installation. Records submitted shall include details of materials used, site test results, layer thicknesses and compaction methods. Completion of Permanent Repair Material System Works NG Testing to determine the initial texture depth requirements in accordance with sub-clause and Table 9/41 shall be carried out on a repair area of such size as to enable the minimum number of test measurements required in IS EN When works in accordance with NRA IAN 08/13 are sufficiently small such that carrying out the volumetric patch method is not feasible, product manufacturers/system installers may use previously tested areas as a reference in order to demonstrate compliance with sub-clause and Table 9/41. Monitoring Period Where applicable, an appropriate special requirement shall be included in the Contract Conditions or the Works Requirements which draws particular attention to sub-clauses , , , , and NRA IAN 07/13. October

14 4. REFERENCES 4.1 National Roads Authority Publications: NRA Manual for Contract Documents for Road Works (NRA MCDRW), generally and specifically: NRA MCDRW Volume 1, NRA Specification for Road Works (NRA SRW) Series 700, Clause 901 and 903. NRA IAN 06/13 Procedures for Use of Permanent Repair Material Systems on National Roads NRA IAN 08/13 Specification and Notes for Guidance on the Use of Permanent Repair Materials 4.2 National Standards Authority of Ireland Publications: IS EN "Cement - composition, specifications and conformity criteria for common cements." IS EN "Bituminous mixtures. Test methods for hot mix asphalt: Determination of the maximum density." IS EN "Bituminous mixtures. Test methods for hot mix asphalt: Determination of bulk density of bituminous specimens Bituminous mixtures. Test methods for hot mix asphalt: Determination of bulk density of bituminous specimens." IS EN "Bituminous mixtures. Test methods for hot mix asphalt: Determination of void characteristics of bituminous specimens." IS EN "Bituminous mixtures. Test methods for hot mix asphalt: Determination of the water sensitivity of bituminous specimens." IS EN "Bituminous mixtures. Test methods for hot mix asphalt: Wheel tracking." IS EN "Bituminous mixtures. Test methods for hot mix asphalt: Determination of the indirect tensile strength of bituminous specimens." IS EN "Bituminous mixtures. Test methods for hot mix asphalt: Specimen prepared by roller compactor." Draft IS EN Test methods for hot mix asphalt - Determination of friction after polishing IS EN "Aggregates for bituminous mixtures and surface treatments for roads, airfields and other trafficked areas." IS EN "Road and airfield surface characteristics - Test methods. Measurement of pavement surface macrotexture depth using a volumetric patch technique." IS EN ISO Quality management systems - requirements (includes corrigendum 2009). SR 17. "Guidance on the use of IS EN 13043: aggregates for bituminous mixtures and surface treatments for roads, airfields and other trafficked areas." SR 28. "Recommendation for the use and implementation of the IS EN series bituminous mixtures - material specification." October

15 4.3 British Standards Institution Publications: BS "Asphalt for roads and other paved areas - Specification for transport, laying and compaction and type testing protocols." BS "Sampling and examination of bituminous mixtures for roads and other paved areas: Methods of test for the determination of wheel-tracking rate and depth." BS "Bitumen road emulsions. Code of practice for use of cationic bitumen emulsions on roads and other paved areas." October

16 5. ENQUIRIES 5.1 All technical enquiries or comments on this document, or any of the documents listed as forming part of the NRA MCDRW, should be sent by to addressed to the following: Head of Network Management, Engineering Standards & Research National Roads Authority St Martin s House Waterloo Road Dublin 4... Pat Maher Head of Network Management, Engineering Standards & Research October