9 Materials Evaluation.ppt - KFUPMfaculty.kfupm.edu.sa/CE/hawahab/WEBPAGE/CE442_files/CLASS...
Transcript of 9 Materials Evaluation.ppt - KFUPMfaculty.kfupm.edu.sa/CE/hawahab/WEBPAGE/CE442_files/CLASS...
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Material Characterization
Material Characterization
Purpose:• to understand material behavior• construction control• material properties for design( h= f (material))• pavement evaluationpavement evaluation• establish failure criteria
Types of tests:• Arbitrary: CBR, Stability....• Fundamental: Triaxial, Diametral...• Full Scale: AASHTO road test, ...
Requirement:• establish properties: Test....• Failure criteria: Fatigue, rutting, deformation, serviceability...
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Material Testing
soils and granular materials:soil classificationsubgrade support (plate bearing, k)California bearing ratio (CBR)California bearing ratio (CBR)Static triaxial test (φ, angle of internal friction, C, cohesion and τ, shear)Dynamic triaxial test ( permanent deformation, resilient modulus (Mr) for fine and coarse materials and poisons ratio (μ))
Bituminous materials testing:Marshall testSuperPaveModulus of rupture, MRindirect tensile test, ITS or σTDiametral test, resilient modulus,MrDynamic triaxial, resilient modulus,Mr, poisons ratio (μ)and permanent deformationcomplex dynamic modulus, E*
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subgrade support (plate bearing, k)
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p
k = P / ∆
∆
σ2 = σ1- σ3
Static triaxial test (φ, angle of internal friction, C, cohesion and τ, shear)
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φστ tan+= c
σ3 σ2
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Dynamic triaxial test ( permanent deformation, resilient modulus (Mr) for fine and coarse materials and poisons ratio (μ))
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Mr =(σ1- σ3) /εz = σ2/εz
μ = εr / εz
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Dynamic triaxial test
G l M t i lGranular Materials
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Fine Grained Materials
K1
K2
Modulus of rupture, MR, Es
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indirect tensile test, ITS or σT
σ = 2P / π d t
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σT = 2P/μ D H
dtP
π=σ=
2StressTensileHorizontal
⎥⎦
⎤⎢⎣
⎡πμ+
μ+δ=ε=
)()31(2StrainTensileHorizontal
bad
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Diametral test, resilient modulus,Mr
Diametral test
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Diametral test
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Dynamic triaxial test
εp= I NS
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Diametral test
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Bending Beam Fatigue test
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Fatigue concept
Nf =k1(1/δ)k2
N k3(1/Є)k4Nf =k3(1/Є)k4