technical recommendations for highways no 12 trh 12
TRANSCRIPT
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Technical Recommendations for
Highways No 12TRH 12
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Technical Recommendations for Highways No 12
TRH 12
19801980
1983 – 1983 – draft TRH 12: Bituminous pavement rehabilitation design
1983 1989 19901983 1989 1990
1990 – 1990 – draft TRH12: Flexible pavement draft TRH12: Flexible pavement rehabilitation investigation and rehabilitation investigation and
design - design - 19971997
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1983 draft TRH 12: bituminous pavement rehabilitation design
Initial assessmentInitial assessment Detailed assessmentDetailed assessment Rehabilitation designRehabilitation design Economic analysisEconomic analysis
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1990 &1997draft TRH 12: flexible pavement rehabilitation investigation and
design Managerial inputs Condition assessment
Initial assessment (evaluation criteria) Detailed assessment
Rehabilitation design – applicability - refer to detailed documents
Practical and functional aspects Economic analysis
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draft TRH 12: flexible pavement rehabilitation investigation and
designLatest revision:: 2004 – Need identified – RMC of COTO 22 July 2004 – Symposium in Cape town
- feedback from industry/role players 15 Nov 2004 – Workshop at Gautrans 27 Jan 2005 – Needs list of all inputs
received
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draft TRH 12: flexible pavement rehabilitation investigation and
designSANRAL fundingSANRAL coordinate for RMC Chair – Mr JC van der Walt (SANRAL)
Manager - Mr R Lorio (SANRAL) Members – Industry/Universities/private
practice First meeting – 14 July 2005
Confirm scope
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draft TRH 12: flexible pavement rehabilitation investigation and
designScope: Include new/improved knowledge Definitions & back ground information Change tone – step by step & check lists Provide guidelines :
type & accuracy of information needed Details on the use of information
Examples & photographs Layout of document
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draft TRH 12: revision
Very comprehensive revision
First draft – 31 May 2006 Committee Meeting - 3 August 2006
Work groups Detailed workshop 12 &13 Oct 2006
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draft TRH 12: Flexible pavement investigation, analysis and
rehabilitation design
1. Introduction2. Non pavement related aspects influencing
pavement rehabilitation design3. Pavement Condition Assessment
1. Initial assessment2. Detailed assessment
4. Rehabilitation options and design approach5. Life cycle cost comparisons
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2006 – draft TRH12
1 Introduction1.1 Background
1.2 Scope
1.3 Pavement “life”
1.4 The art of pavement rehabilitation design
1.5 Managing pavement rehabilitation design
1.6 Recommended approach
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Pavement “end of life”
End of “optimal functionality”Service will continue - BUT
Risk to road user• Safety considerations• Road user costs
Risk to road authority/owner• Costs (maintenance & rehab)
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The “art” of pavement rehabilitation design Perception: relatively simple
Low risk of disastrous consequencesProfessional riskLack of accountability
however
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The “art” of pavement rehabilitation designFact : complex structures Pavement engineer – optimal (cost effective) design:
Materials (various types, large variability) Construction techniques Moisture control & drainage Evaluation tests/methods Design methods (applicability) Environmental conditions & influence Life cycle cost comparison techniques etc
“ “ forensic investigation”forensic investigation”
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Optimal design
Conservative design
Increase in risk
Acceptable risk
Increase in expertise
Increase in rehabilitation construction costs
High risk
Low risk
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MANAGEMENTCONSIDERATIONS
SECTION 2.1
Commission project level rehabilitation investigation and design
projects
SOCIAL/ENVIRONMENTALCONSIDERATIONS
SECTION 2.2
PRACTICAL & FUNCTIONALCONSIDERATIONS
SECTION 2.3
CONDITIONASSESSMENT
SECTION 3
REHABILITATION DESIGN
SECTION 4
LIFE CYCLE COSTCOMPARISON
SECTION 5
NETWORK LEVEL INVESTIGATIONS:
ROAD MANAGEMENT SYSTEMS
PROJECT LEVEL INVESTIGATIONS TRH12
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Section 2: Non pavement related aspects influencing rehabilitation design
2.12.1 IntroductionIntroduction2.2 2.2 Management considerationsManagement considerations2.32.3 Social and environmental Social and environmental
considerationsconsiderationslabour int; OH&S; EIAlabour int; OH&S; EIA
2.42.4 Practical & function aspectsPractical & function aspects2.52.5 ChecklistChecklist
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Pavement surveillancePavement surveillance
•Input data sensitiveInput data sensitive– type of measurementtype of measurement
–frequency - accuracyfrequency - accuracy
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Traffic loading
GuidelinesDetailed load surveysEstimates – traffic volumes
Updated E80 values E80 growth rates Example – sensitivity analysis
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TABLE 3.963: E80 factors for different heavy vehicle groupings
HEAVY VEHICLE
GROUPING
TRH 16 (1991) SATCC (1998) CTO STATIONS(1986-2002)
HSWIM#
Low Med High Low Med High Low Med High
2 + 3 Axles 0.6 1.2 1.9 0.4 1.8 2.5 0.7 2.0 2.5
>3 Axles 1.6 3.0 4.1 1.2 4.1 5.5 1.9 3.7. 5.0
Short(2 axles)
0.3 0.7 1.1 0.3 1.5 2.0 0.3 0.9 1.7
Medium(3+4 axles)
0.8 1.8 2.8 0.6 2.3 3.3 1.0 2.1 3.1
Long(>4 axles)
2.1 3.4 4.4 1.4 4.6 6.2 2.2 4.2 5.6
Low
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Processing of data
Facilitate objectives of the initial assessmentIdentify uniform pavement sections
Differences in;
• Visual condition (S – W – S)
• Serviceability (S – W –S)
• Structural integrity
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Evaluation criteria
Facilitate the identification of differencesRelatively “poor “ sectionsRelatively “average” sectionsRelatively “good” sections
Relative to past traffic loading
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µ = mean
σ = standard deviation
X, Y = percentile valuesα = percentage of data
Y X
α1
α2
α3
α1 α2 α3~ ~
X = X = µ + 0.45µ + 0.45σσ Y = µ - 0.45Y = µ - 0.45σσ
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Identification of uniform sections
All informationAs built & historyLoadingVisual conditionSurveillance measurements
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Identification of uniform sections
Surveillance measurementsCusum Normalized CusumCombination of data
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Normalized cusum
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Detailed assessment
Cause and mechanism of distressCause and mechanism of distress Pavement situation of each Pavement situation of each
uniform pavement sectionuniform pavement section
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End of detailed assessment
All details of each section Know what is wrong Know cause and mechanism of distress Identified applicable rehab options
Proceed with design
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Rehabilitation options & design approach
ApplicabilityAdvantages/limitations/disadvantages
Design methodsDeflectionDCPMechanistic
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Cos
ts o
f im
ple
men
tati
on
Confidence and benefits
Level of sophistication
Lev
el o
f ex
per
tise
req
uir
ed
Not
practical
b/c ratio
too low
Non- simplified
Mech design
Design curve
Behaviour catalogue
Empirical/ theoretical
Design charts
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Life-cycle cost comparison
PPWOCAgency costsRoad user costs
Probability theory
REACT to be incorporated
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2006 TRH12
300 + pages - to be shortened300 + pages - to be shortened Background to recommendations to be Background to recommendations to be
removed – use referencesremoved – use references Traffic loading = TRH16Traffic loading = TRH16 Incorporate typical document contents Incorporate typical document contents
pages in line with practicepages in line with practice Eg Scoping Report, IA Report, DA Eg Scoping Report, IA Report, DA
Report, ectReport, ect