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Håkan Arvidsson


LA vs HVS
Los Angelesvärde i jämförelse med
nedbrytning från hjullast på obundet bärlager.
Vad är vad…?
Los Angeles, LA = motstånd mot fragmentering
• 5 kg, 10/14 mm roteras med 11 kulor (5 cm) i 500 varv i en ”stor
  trumma”. LA = andel < 1,6 mm efter test.
HVS = Simulator för nedbrytning från tung trafik
• Accelererad provning 20-25 tusen axellaster/dygn
• ”Lab. i fullskala.”
Material
5 granitiska material med olika LA med tonvikt kring 35.
Likadana kornkurvor (proportionerade).
• Bärlager 0/32 mm; < 0,063: 2,5 %
• 1 x 1 m, tjocklek 8 cm => 168 kg (2,1 Mg/m³)
• 12 delprover à 14 kg
                     K      F      S      V       H          Fraktion
nedkrossning   LA    34     38      21     28       36         10/14
nötning        MDE     10      9      5     16        8        10/14
flisighet      FI      16     17     27     21       14         4/32
densitet       ρp    2,69   2,64   2,64   2,80     2,63    typ 11/16, 8/16 eller 14/16
Kornstorleksfördelning

                          0,06                    0,2   Sand       0,6          2              6     Grus       20           60
                                         fin            mellan           grov       fin              mellan           grov
                   100%

                   90%
                                                   Målkurva prop.
                   80%
                                                   Bärlager 0/32 VV TBT 2007, dekl mtrl
                   70%
Passerande mängd




                   60%

                   50%

                   40%

                   30%

                   20%

                   10%

                    0%
                          0,063           0,125     0,25         0,5     1      2         4   5,6   8 11,2 16        31,5 45 63   90   200
                                 0,075
                                                                             Kornstorlek, mm
Preparering
Test
Provgropar
Efter test

                          0,06                    0,2   Sand       0,6          2              6        Grus       20             60
                                         fin            mellan           grov       fin                 mellan           grov
                   100%

                   90%
                                               K efter HVS
                   80%
                                               K före test
                   70%
Passerande mängd




                   60%

                   50%

                   40%

                   30%

                   20%

                   10%

                    0%
                          0,063           0,125     0,25         0,5     1      2         4   5,6   8    11,2 16        31,5 45   63   90   200
                                 0,075
                                                                             Kornstorlek, mm
Skillnad mellan övre och undre skikt
Areor under kurvan
        3.0



        2.5



        2.0                                                Area före


                                                           Area efter
        1.5


                                                           Målkurva, Fuller
        1.0



        0.5



        0.0
              S (21)   V (28)   K (34)   H (36)   F (38)
Samband LA och HVS?
Ändring av area under test som funktion av
”stenanalys”
Spårutveckling
                                            Antal passager
                         0   5000   10000       15000        20000   25000    30000
                     0

                     2

                     4
                                                                                      Spårdjup K (34)
                     6
                                                                                      Spårdjup F (38)
     Spårdjup, mm




                     8                                                   8
                                                                                      Spårdjup V (28)
                    10                                                   10
                                                                         11           Spårdjup S (21)
                    12                                                   12
                                                                                      Spårdjup H (36)
                    14

                    16

                    18                                                   18

                    20
Spårdjup som funktion av skillnad mellan lager
               20

               18
                                             R² = 0.97
               16

               14

               12
    Spårdjup




               10

                8

                6

                4

                2

                0
       -0.1         0   0.1    0.2            0.3        0.4   0.5   0.6
                              areaDiff (Undre-Övre)
Slutsatser


 • Det finns en tydlig mätbar nedbrytning av
   materialet i HVS:en

 • Med de testade materialen inget tydligt
   samband mellan nedbrytning och LA

 • Man kan studera omlagringar
Fortsättning…
120

                                                                      7
100


 80                                                                   38


                                                                             FI
 60                                                           10
                       21      16                     17                     MDE
                                      16      14              11
               13                                      9
                                                                             LA
 40    27                     18      10       8
                      16
               9                                                      62
       5                                                      44
 20                                           36      38
                              29      34
              27      28
       21
 0
       S)      St     (V)      T      (K)     (H)     (F)     E6      N

 Materialbeteckning inom parentes är material från ”försök 1”.
 Material S kommer att vara med även i ”försök 2”, därav halva parentesen.
Mer info…


Publicering
VTI Notat 4-2011
”Jämförelse mellan Los Angelesvärde och
nedbrytning från hjullast”

hakan.arvidsson@vti.se




TACK!

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Session 77 Håkan Arvidsson

  • 1. Håkan Arvidsson LA vs HVS Los Angelesvärde i jämförelse med nedbrytning från hjullast på obundet bärlager.
  • 2. Vad är vad…? Los Angeles, LA = motstånd mot fragmentering • 5 kg, 10/14 mm roteras med 11 kulor (5 cm) i 500 varv i en ”stor trumma”. LA = andel < 1,6 mm efter test. HVS = Simulator för nedbrytning från tung trafik • Accelererad provning 20-25 tusen axellaster/dygn • ”Lab. i fullskala.”
  • 3. Material 5 granitiska material med olika LA med tonvikt kring 35. Likadana kornkurvor (proportionerade). • Bärlager 0/32 mm; < 0,063: 2,5 % • 1 x 1 m, tjocklek 8 cm => 168 kg (2,1 Mg/m³) • 12 delprover à 14 kg K F S V H Fraktion nedkrossning LA 34 38 21 28 36 10/14 nötning MDE 10 9 5 16 8 10/14 flisighet FI 16 17 27 21 14 4/32 densitet ρp 2,69 2,64 2,64 2,80 2,63 typ 11/16, 8/16 eller 14/16
  • 4. Kornstorleksfördelning 0,06 0,2 Sand 0,6 2 6 Grus 20 60 fin mellan grov fin mellan grov 100% 90% Målkurva prop. 80% Bärlager 0/32 VV TBT 2007, dekl mtrl 70% Passerande mängd 60% 50% 40% 30% 20% 10% 0% 0,063 0,125 0,25 0,5 1 2 4 5,6 8 11,2 16 31,5 45 63 90 200 0,075 Kornstorlek, mm
  • 8. Efter test 0,06 0,2 Sand 0,6 2 6 Grus 20 60 fin mellan grov fin mellan grov 100% 90% K efter HVS 80% K före test 70% Passerande mängd 60% 50% 40% 30% 20% 10% 0% 0,063 0,125 0,25 0,5 1 2 4 5,6 8 11,2 16 31,5 45 63 90 200 0,075 Kornstorlek, mm
  • 9. Skillnad mellan övre och undre skikt
  • 10. Areor under kurvan 3.0 2.5 2.0 Area före Area efter 1.5 Målkurva, Fuller 1.0 0.5 0.0 S (21) V (28) K (34) H (36) F (38)
  • 12. Ändring av area under test som funktion av ”stenanalys”
  • 13. Spårutveckling Antal passager 0 5000 10000 15000 20000 25000 30000 0 2 4 Spårdjup K (34) 6 Spårdjup F (38) Spårdjup, mm 8 8 Spårdjup V (28) 10 10 11 Spårdjup S (21) 12 12 Spårdjup H (36) 14 16 18 18 20
  • 14. Spårdjup som funktion av skillnad mellan lager 20 18 R² = 0.97 16 14 12 Spårdjup 10 8 6 4 2 0 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 areaDiff (Undre-Övre)
  • 15. Slutsatser • Det finns en tydlig mätbar nedbrytning av materialet i HVS:en • Med de testade materialen inget tydligt samband mellan nedbrytning och LA • Man kan studera omlagringar
  • 16. Fortsättning… 120 7 100 80 38 FI 60 10 21 16 17 MDE 16 14 11 13 9 LA 40 27 18 10 8 16 9 62 5 44 20 36 38 29 34 27 28 21 0 S) St (V) T (K) (H) (F) E6 N Materialbeteckning inom parentes är material från ”försök 1”. Material S kommer att vara med även i ”försök 2”, därav halva parentesen.
  • 17. Mer info… Publicering VTI Notat 4-2011 ”Jämförelse mellan Los Angelesvärde och nedbrytning från hjullast” hakan.arvidsson@vti.se TACK!