DMRB VOLUME 7 SECTION 3 - Standards for …

1 VOLUME 7 pavement design and maintenance SECTION 3 pavement maintenance assessmentpart 2Hd 29/08data for pavement assessmentsummarYThis Standard describes the data required for pavement assessment and the data collection methods that are currently approved by the Overseeing Organisations. These methods cover measurement of the construction and condition of different types of pavements, except skidding resistance which is covered in HD 28 (DMRB ). This revision has been updated to reflect current practice and includes requirements previously issued in IAN 42 for use1. Remove Contents pages from VOLUME 7 and insert new Contents pages for VOLUME 7 dated May Remove HD 29/99 from VOLUME 7, SECTION 3 which is superseded by this Standard and archive as Insert HD 29/08 into VOLUME 7, SECTION Please archive this sheet as : A quarterly index with a full set of VOLUME Contents Pages is available separately from The Stationery Office manual for roads and Bridgesmay 2008design manual for roads and BridgesHd 29/08 VOLUME 7, SECTION 3, part 2tHe HigHwaYs agencYscottisH government welsH assemBlY government llYwodraetH cYnulliad cYmrutHe department for regional development nortHern irelandData for pavement AssessmentSummary: This Standard describes the data required for pavement assessment and the data collection methods that are currently approved by the Overseeing Organisations.

2 These methods cover measurement of the construction and condition of different types of pavements, except skidding resistance which is covered in HD 28 (DMRB ). This revision has been updated to reflect current practice and includes requirements previously issued in IAN 42 2008volume 7 SECTION 3 part 2 Hd 29/08registration of amendmentsamend nopage nosignature & date of incorporation of amendmentsamend nopage nosignature & date of incorporation of amendments registration of amendmentsmay 2008volume 7 SECTION 3 part 2 Hd 29/08registration of amendmentsamend nopage nosignature & date of incorporation of amendmentsamend nopage nosignature & date of incorporation of amendments registration of amendmentsvolume 7 pavement design and maintenance SECTION 3 pavement maintenance assessmentpart 2Hd 29/08data for pavement assessmentcontentsChapter1. Introduction 2. Traffic Speed Condition Surveys 3. Visual Condition Surveys4. Deflectograph Testing5.

3 Falling Weight Deflectometer6. Ground-Penetrating Radar (GPR)7. Coring and Test Pits8. References and Bibliography9. Enquiries Annexes1. Not currently used2. TRACS A. assessment Criteria B. Detailed Description of TRACS Condition Data3. Not currently used4. Deflectograph A. Calibration B. data Processing using PANDEF5. Falling Weight Deflectometer (FWD) A. Requirements for Consistency Checks B. FWD Surface Modulus and Reporting Template6. Ground-Penetrating Radar (GPR) A. Introduction to GPR B. Calibration of GPR for Determination of Layer Thickness C. Reporting the Results of a GPR Surveydesign manual for roads and Bridgesmay 2008may 2008volume 7 SECTION 3 part 2 Hd 29/081. introductionmandatory sections Sections of this document which form part of the Standards of the Overseeing Organisations are highlighted by being contained in boxes. These are the sections with which the Design Organisations must comply, or must have agreed a suitable alternative approach through a departure from Standard with the relevant Overseeing Organisation.

4 The remainder of the document contains advice and enlargement which is commended to Design Organisations for their consideration. This Part describes the data required for pavement assessment and the data collection methods that are currently approved by the Overseeing Organisations. These methods cover measurement of the construction and condition of different types of pavements, except skidding resistance which is covered in HD 28 (DMRB ). Guidance is also given on the processing of data obtained by the methods (where appropriate). Interpretation of the results is generally covered in HD 30 (DMRB ) which also describes the use of each assessment method in the context of the overall pavement monitoring and assessment process. Advice on the interpretation of TRACS data (see Chapter 2) is given in this Part. The list of methods is not exhaustive and is not intended to exclude the use of other machines and methods. However, those which are presently part of the Overseeing Organisations standard assessment procedure are all This Part must be used forthwith on all schemes for the improvement and maintenance of trunk roads including motorways currently being prepared, provided that, in the opinion of the Overseeing Organisation this would not result in significant additional expense or delay.

5 Design organisations must confirm its application to particular schemes with the Overseeing Organisation. use in northern ireland For use in Northern Ireland, this Standard will apply to those roads designated by the Overseeing Organisation. mutual recognition The construction and maintenance of highway pavements will normally be carried out under contracts incorporating the Overseeing Organisations Specification for Highway Works (SHW) which is contained in the Manual of Contract Documents for Highway Works VOLUME 1 (MCHW 1). In such cases products conforming to equivalent Standards and specification of other Member States (MS) of the European Economic Area (EEA) or a State which is party to a relevant agreement with the European Union and tests undertaken in other MS of the EEA or a State which is party to a relevant agreement with the European Union will be acceptable in accordance with the terms of Clauses 104 and 105 (MCHW ). Any contract not containing these Clauses must contain suitable clauses of mutual recognition having the same effect, regarding which advice must be sought from the Overseeing Organisation.

6 Health and safety All surveys and data collection on or in the vicinity of highway pavements must be carried out in accordance with: Health and Safety at Work Act (1974); Management of Health and Safety at Work Regulations (1999); Construction (Design and Management) Regulations (2007) (CDM Regulations);1/1chapter 1 introductionmay 2008volume 7 SECTION 3 part 2 Hd 29/081/2chapter 1 introduction Traffic Signs Manual Chapter 8 (2006); and Safety at Street Works and Road Works A Code of In Northern Ireland, the relevant Health and Safety documents are: Construction (Design and Management) Regulations (Northern Ireland) 2007; Health and Safety at Work (Northern Ireland) Order 1978; Management of Health and Safety at Work Regulations (2000); Traffic Signs Manual Chapter 8 (2006); and Safety at Street Works and Road Works A Code of Practice. For the Highways Agency network, further information on Health and Safety is given in Part 1 of the Network Management Manual.

7 Where data collection involves excavating or driving probes into the subgrade at locations where there may be buried services, the public utility organisations must be contacted for details of the locations of their equipment. The exact location of buried services should be established prior to carrying out the work using cable locating equipment. A glossary and list of principal abbeviations is given in HD 23 (DMRB ). The term asphalt replaces bituminous material as the generic term for pavement material consising of mineral aggregate combined with a bitumen binder and which is normally laid by a paver. Asphalt includes all bitumen bound base, binder course and surface course materials, except surface dressing. There are some exceptions to this as indicated below, where bituminous material continues in use: Deflectograph processing uses the technical terms Equivalent Thickness of Sound Bituminous Material (ESBM) , Total Thickness of Bituminous Material (TTBM) and PANDEF Base Type Classification BITS.

8 Use of the term asphalt would require changes to these acronyms and to text in the associated software. In some instances the term bituminous materials may also refer to surface dressings as well as paver laid material. The term Hydraulically Bound Mixture or HBM is used as the generic term for pavement material consisting of mineral aggregate bound with cement, lime, slag or fly ash binder, or a combination thereof. The terms lean concrete , cement bound material or CBM are no longer used except in connection with PANDEF Base Type Classification CEMT .may 2008volume 7 SECTION 3 part 2 Hd 29/082. traffic speed condition surveYstypes of On the trunk road network in England, surveys carried out under the Highways Agency (HA) TRAffic-speed Condition Survey (TRACS) contract replaced the previous High-speed Road Monitor (HRM) surveys in the summer of 2000. TRACS data is collected under a central HA contract which includes the loading of data to HAPMS for subsequent use by Agents and On the National Network in Scotland, designated roads in Northern Ireland and on the Local Authority Road Network in England, traffic-speed surveys are carried out using the Surface Condition assessment of the National NEtwork of Roads (SCANNER) system.

9 On the National Network in Wales a method similar to SCANNER is The SCANNER survey details are given in the five- VOLUME User Guide and Specifications published by the UK Roads Board (2007). A summary of the features of SCANNER surveys is given below, following the text relating to TRACS surveys. Traffic-Speed Condition Survey (TRACS) (Relevant to the HA in England) TRACS surveys are carried out using survey vehicles equipped with lasers, video image collection and inertia measurement apparatus to enable surveys of the road surface condition to be carried out whilst travelling at variable speeds, of up to 100 km/h, to match prevailing traffic, and hence cause minimum disruption to other road 2 Traffic Speed Condition Surveysfigure : tracs vehicle TRACS surveys are carried out annually usually over: a) both lanes of single carriageways;b) lanes 1 and 2 of the main carriageway on dual carriageways; and c) lane 1 of slip roads. Roundabouts are excluded from TRACS surveys.

10 For precise details of the coverage and frequency of these surveys the HA should be TRACS surveys are controlled by an end result specification for the survey equipment and a detailed Quality Audit procedure for the surveys includes regular independent checks to maintain quality The TRACS survey vehicle measures: Texture Profile in the nearside wheel-track at approximately 1mm longitudinal intervals; Transverse Profile across a width at approximately longitudinal intervals;may 2008volume 7 SECTION 3 part 2 Hd 29/082/2chapter 2 Traffic Speed Condition Surveys Longitudinal Profile in the nearside wheel-track at approximately longitudinal intervals; cracking over a width of (continuous monitoring); vehicle geographical position (Northing, Easting and altitude) as well as Road Geometry (gradient, crossfall and curvature) at discrete 5m intervals; a forward-facing video record of the road being surveyed; a downward-facing video record of the road being All data collected by the TRACS survey vehicle is referenced to the network sections to a longitudinal accuracy of 1m.