Post on 29-Dec-2015
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IntroductionCompositeColloid structureTechnical propertyTechnical propertyStandards and choices
Petroleum Asphalt
§8.2 Basic Components of Water Proofing Material
Waterproofing propertyViscosityPlasticityTemperature stabilityAtmosphere stability
Technical Property
Petroleum asphalt has the characteristics Hydrophobic
Compact structureStrong adhesive
force Good plasticity
Waterproofing Property
Petroleum asphalt has the characteristics : hydrophobic, compact structure, strong adhesive force and good plasticity. So it has good performance moisture-proofing and water proofing material.
well moisture-proofing and water proofing material
Waterproofing Property
Viscosity
It refers to a property which can hinder the relative flow among asphalt. It has an ability of deformation resistance against the outer force. It is an important index of petroleum asphalt properties.
Absolute viscosityViscosity can be expressed by absolute viscosity. But it is often replaced by relative viscosity because the test methods are complicate.
Relative viscosity penetration degree - solid or semi-solid petroleum asphalt Normal viscosity - liquid petroleum asphalt
Index and Test MethodIndex and Test Method
Viscosity
Penetration Degree
It refers to relative viscidity of solid It refers to relative viscidity of solid and semi-solid petroleum asphalt.and semi-solid petroleum asphalt.
DefinitionDefinition
Test InstrumentTest Instrument
Penetro-meter showPenetro-meter shown in Fig.8.2.2.n in Fig.8.2.2.
Fig.8.2.2 Penetro-meterFig.8.2.2 Penetro-meter
Test Conditions and Methods
Put the 100g load-staPut the 100g load-standard needle into the 2ndard needle into the 25 specimen in 5 secon℃5 specimen in 5 secon℃ds. ds.
Read the depth of the Read the depth of the penetrometer in the spepenetrometer in the specimen (Fig.8.2.3 ).cimen (Fig.8.2.3 ). Fig.8.2.3 Sketch map of Fig.8.2.3 Sketch map of
penetration degree testpenetration degree test
Penetration Degree
Relation Between Index and PropertyRelation Between Index and Property
Hardener
Lower penetration degree
Higher viscosity
The relationship The relationship between penetration between penetration degree and viscosity is degree and viscosity is the lower the the lower the penetration degree, the penetration degree, the higher the viscosity, higher the viscosity, the hardener the the hardener the Petroleum Asphalt Petroleum Asphalt
It refers to relative viscidity of liquid It refers to relative viscidity of liquid petroleum asphalt.petroleum asphalt.
Standard ViscidityStandard Viscidity
Normal viscidity instrumentNormal viscidity instrumentTest the time of the 50cm³ asphaTest the time of the 50cm³ aspha
lt flowing through the required dilt flowing through the required diameterameter(3,5,10mm) in the required tempe(3,5,10mm) in the required temperature(20rature(20 、、 2525、、 3030、、 60℃60℃))
DefinitionDefinition
TestTest
Fig.8.2.4 Normal viscidity instrument
Plasticity
Index
Definition
Plasticity is a kind of property that petroleum Plasticity is a kind of property that petroleum asphalt keeps the shape after distortion.asphalt keeps the shape after distortion.
DuctilityDuctility
Testmake the asphalt sample as pattern standard make the asphalt sample as pattern standard
mold at 25 ℃mold at 25 ℃have a draw test at 5cm/min speedhave a draw test at 5cm/min speedthe ductility is the length of the asphalt when the ductility is the length of the asphalt when it breaksit breaks
Test
stronger ductility
better plasticity
Flash of Flash of ductility test test
Plasticity
Temperature stability refers to the Temperature stability refers to the change of viscosity and plasticity of change of viscosity and plasticity of petroleum asphalt with temperature petroleum asphalt with temperature transformation.transformation.
Softening pointSoftening point
Definition
Index
Temperature StabilityTemperature Stability
Test InstrumentTest Instrument
Ring and Ball Softening Point Instrument
softening point temperature stability
Fig.8.2.5 Ring and Ball Fig.8.2.5 Ring and Ball Softening Point InstrumentSoftening Point Instrument
RelationshipRelationship
Temperature StabilityTemperature Stability
Test Conditions and Methods
Fig 8.2.6 Sketch Fig 8.2.6 Sketch map of ductility testmap of ductility test
Put the asphalt sample into the required copper ring (D=16mm,h=6mm), where a steel ball was put on. Dip them into the water or the glycerine and heat them in required velocity (5 /min). After ℃that, make the asphalt fall down . The temperature is the softening point when the asphalt falls to the required point.
Temperature StabilityTemperature Stability
BackBack
Atmosphere stability Atmosphere stability refers that refers that petroleum asphalt resists aging in resists aging in heat, oxygen and wet heat, oxygen and wet conditions.conditions.
Index
Atmosphere Atmosphere StabilityStability
Definition
It was evaluated by thIt was evaluated by the loss of evaporation ane loss of evaporation and the penetration grade d the penetration grade after the evaporation.after the evaporation.
(The standard of pavement asphalt): 50g asphalt container D=5.5×35, 163 for 5 hours℃
less loss → more stable
RelationshipRelationship
weightoriginal the
weight loss then evaporatio of Loss
Test of the loss of evaporation
Atmosphere Atmosphere StabilityStability
Test of the ratio of penetration degree after evaporation
(The standard of pavement asphalt): make 50ml asphalt 3.2mm thick, oven( 163 5h℃ )
degreen penetratio original
n evaporatioafter degreen penetration evaporatioafter degreen penetratio of ratio The
The greater the ratio of penetration degree after evaporation, the more stable
RelationshipRelationship
Atmosphere Atmosphere StabilityStability