Jostein, Quality control measures, State of practise
Transcript of Jostein, Quality control measures, State of practise
![Page 1: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/1.jpg)
Quality Control Measures, State of Practice
Jostein Aksnes
NPRA, Road Technology Division
![Page 2: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/2.jpg)
Outline
• The Norwegian Design Guide
• What materials do we use, and why?
• Quality control measures
![Page 3: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/3.jpg)
The Norwegian design guide
• Pavement design according to the Norwegian design guide, ”Håndbok 018”
• Specification of layerthicknesses and materials
• Quality requirements for eachlayer and material are given in ”Håndbok 018”
• Norwegian quality requirementsare adapted to EU-standards
![Page 4: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/4.jpg)
What type of materials do we normally choosefor Norwegian pavementconstructions?
![Page 5: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/5.jpg)
Sub-base layer
• Unbound, coarse crushed rock materials are normally used
• Dmax < 2/3 of the layer thickness
• Fraction 0-120 mm up to 0-600 mm
• Gravel and recycled materials (asphalt, concrete, brick) may also be used
![Page 6: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/6.jpg)
Base layer
• Lower layer
– Unbound materials
– Crushed and well graded
• Upper layer
– Bituminous or unbound materials, depending on the traffic volume
![Page 7: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/7.jpg)
![Page 8: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/8.jpg)
![Page 9: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/9.jpg)
Pavement
Normally hot mixed asphalt
![Page 10: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/10.jpg)
Reasons for choice of materials
• Unbound materials
– Crushed and well graded to ensure good stiffness and stability
– Low fines content to avoid frost susceptibility
– High mechanical strength to reduce crushing and generation of fines
• Bituminous materials
– Durability (economy)
– Properties of the mixture adjusted to traffic, climaticloads and sub-grade condition
– Good friction properties
– Easy to maintain (compared to concrete)
![Page 11: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/11.jpg)
Construction
• The construction job is allocated to a contractor after an ordinary tender procedure
• The quality control is mainly based on thecontractors documentation
• In addition: Spot checking, varyingnumber and extent
![Page 12: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/12.jpg)
Quality control - what do we emphasize?
Forsterkningslag 1)
Mek. stab. bærelag
Bærelag av bitumenstabiliserte materialer
Kontroll av S/G P/K SS Gk Fk Fp Ag As Ap Pp Eg Ep Sg Bg Ak
Gjb I Gjb II
Materialegenskaper • Los Angeles-verdi X X X X X X X X X X X X X X • flisighetsindeks X X X X X X X X X X X • mølleverdi2) X X X X X X X X X X X X X X X • micro-Deval-koeffisient X X X X X X X X X X X X X X X • andel knuste korn X X X X • bindemiddelkvalitet • massesammensetning
X X X X X X X X X
Korngradering • kornfordeling • maks. steinstørrelse
X X
X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X
Vannømfintlighet X X X X X X X Telefarlighet X X X X X X X Bindemiddelmengde X X X X X X X X Asfalttemperatur • materialproduksjon • utlagt materiale
X X
X X
X X
X
Komprimering X X X X X X X X X X Forbruk X X X X X X X X Indirekte strekkstyrke X X X X X Sammensetning (renhet) X X
1) S/G betyr sand/grus; P/K betyr pukk/kult; SS betyr sprengt stein 2) Kullemølleverdien tillates brukt i produksjonskontrollen som et alternativ til
kontroll av micro Dev
Sub-base
Base, unbound
Base, bituminous
Recycled concrete
Material quality
Water sensitivity, frost susceptibility
Binder content, temperature
Compaction, quantity
Purity
![Page 13: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/13.jpg)
Compaction of unbound layers
Compaction program including type ofcompactor and requirements for min. and max. passages shall be worked out
![Page 14: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/14.jpg)
Compaction control, unbound layers
• Dmax < 32 mm
– Troxler measurements, required densityaccording to Modified Proctor
• Dmax > 32 mm
– Levelling: average settlement for the last passage of the compactor must be less than10% of the total settlement
• 10 measure points over the road cross section
• Minimum 5 controlled cross sections per ”uniform road section”
– Plate loading test
![Page 15: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/15.jpg)
Layer thicknesses
• Geometric control on top of every layer
– Use of total station and GPS
• Bituminous layers
– contractors documentation of quantitypaved mix (kg/m2)
![Page 16: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/16.jpg)
Pavement quality control
Documentationfrom the producer
Documentation from contractor + NPRA’s spot check
Type testing and factoryproduction control by ”Notified body”
Delivered pavement:
- void content
- homogeneity
- evenness
- crossfall
- friction
Mixture:
- binder content
- grading
- mechanical properties
- temperature
![Page 17: Jostein, Quality control measures, State of practise](https://reader031.fdocuments.net/reader031/viewer/2022012421/6176017896a138420e20b25b/html5/thumbnails/17.jpg)
Thanks for your attention!