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Alternativesforbridgesurfacingswithorthotropicplateddeck:afatiguepointofview
11
3.2.Testlayers
Beforetheinstallationoftheballastandthetracks,anumberofbridge
sectionsisequippedwithvariousdispersionlayersasdiverseasasphalt,rubber
withandwithoutpolyamideinlays,glassfiberreinforcedepoxyplates,
aluminumhoneycombsandwichpanels,e.a.,someofwhichareshowninFig.5
Somemoredetailedinformation,suchasdimensionsandthickness
values,abouttheselayersissummarizedintable1.Thistablealsoillustratesa
widevariationbetweenthedifferentlayersbeingstudied.Mostlayers,butthe
asphaltone,weregluedontothesteeldeckplate,usingspecialneoprene-based
glue.Theasphaltlayerwasinstalledusingclassicinstallationtechniquesfor
coldasphalt.
Theuseofneoprene-basedglueensuredthattheconnectionbetween
dispersionlayeranddeckplatewasassoundaspossible,keepinginmindthat
thetestswereperformedonarailwaybridge,implyingthatalllayersandstrain
gaugesneededtoberemovedattheendofthestrictlylimitedtestingperiod.
Thisfactoralsoimpliedthattheusedgluehadtobeaquick-bondingone.
Theattachmentoflayerstothedeckplateprovedtobeoptimalinmost
layers.Onlythegluingoftheglassfiberreinforcedepoxylayerprovedtobeless
thanideal,whenexaminedduringtheremovalofthelayers.Aspreviousfinite
elementstudiesprove,agoodconnectionofthedispersionlayerisoftheutmost
importanceforoptimaldispersion.Thismightimplythattheresultsfoundfor
theepoxylayeraren’taspositiveastheywouldbeunderidealconditions.
Table1:Characteristicsofthedispersionlayers
NR/SBRRubberlayer
CR/SBRNeoprenelayer,
Polyurethaneplate,
Epoxyplate,
inlays
Asphaltlayer,
Aluminumsandwichpanel
with2PAinlays
PUR90
HGW2372.4withglassfiber
particlefraction2-5mm
-skin
-core,cellsize6,3mm
Area
[m²]
2,2
4,5
7
7
4
3
Thickness
[mm]
23,1
0,8
20
15
20
55
25
8
