Cracking in asphalt pavements

Cracking in asphalt pavements - GN 6506 GN 6506 ITUMINOUS...

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Unformatted text preview: GN 6506 GN 6506 ITUMINOUS MATERIALS ITUMINOUS MATERIALS CGN 6506 CGN 6506: BITUMINOUS MATERIALS BITUMINOUS MATERIALS Topic: Topic: CRACKING IN ASPHALT CRACKING IN ASPHALT PAVEMENTS PAVEMENTS resented by: Anh Tu Do resented by: Anh Tu Do Presented by: Anh Tu Do Presented by: Anh Tu Do Dec 2010 Dec 2010 Introduction Introduction Cracks occur from a variety of causes including stresses from axle loads, temperature changes in the HMA layer, or moisture and temperature changes in an underlying layer. It is important t o accurately identify the type of cracking which a pavement exhibits in order to ccurately ssess e uses r e acking nd accurately assess the causes for the cracking and subsequently the proper repair techniques. he pes f acking eing iscussed clude The types of cracking being discussed include fatigue, low temperature, longitudinal, block, flection, nd ippage reflection, and slippage. Types, causes and repair of cracking Types, causes and repair of cracking Fatigue Cracking Low temperature Cracking Longitudinal Cracking lock racking Block Cracking Reflection Cracking Slippage Cracking Fatigue Cracking Fatigue Cracking pavementinteractive.org atigue acking ften lled lligator acking ecause Fatigue cracking is often called alligator cracking because this closely spaced crack pattern is similar to the pattern on an alligator’s back. Fatigue Cracking Fatigue Cracking www8.dotd.louisiana.gov his pe f ilure enerally ccurs hen e avement This type of failure generally occurs when the pavement has been stressed to the limit of its fatigue life by repetitive axle load applications. Fatigue Cracking Fatigue Cracking Causes of Fatigue cracking: • too heavy loads • more repetitions of a given load than provided for in design. • repetitive passes with overweight trucks and/or • inadequate pavement thickness due to improper design or poor quality control during construction onsequence Consequence: • development of potholes when the individual pieces of HMA physically separate from the adjacent material and are dislodged from the pavement surface by the action of traffic Fatigue Cracking Fatigue Cracking Investigation: needed prior to repair of a pavement with fatigue cracking determines the cause of the problem so that a proper solution can be selected ay volve igging it etermine e...
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Cracking in asphalt pavements - GN 6506 GN 6506 ITUMINOUS...

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