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Study on Estimation for Fatigue Cracked Life of Asphalt Pavement Based on Local Strain

Author: NiLei
Tutor: ZhengMuLian
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Asphalt Pavement Fatigue cracking life Local strain Direct tensile test Control strain
CLC: U416.217
Type: Master's thesis
Year: 2011
Downloads: 94
Quote: 0
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Abstract


With the continuous development of China 's traffic , asphalt pavement has become the main structure of the high-grade road in China , more than 90% of the semi-rigid base asphalt pavement . But the modern road transport large amount of traffic , serious overloading , exposing the weaknesses of the semi-rigid base asphalt pavement fatigue resistance , can no longer meet the need . Therefore, at home and abroad for better performance and longer life durability of pavement carried out research . Rigid base asphalt pavement durability road , it has a high strength, stiffness , good integrity and stability , good erosion resistance and crack resistance , can provide a durable foundation conditions and structural support force . The most critical technical issues in the rigid base asphalt pavement is to prevent reflective cracking . Therefore it is necessary to study fatigue cracking of the asphalt pavement . This paper presents a reasonable asphalt mixture tensile fatigue test conditions , the matrix asphalt mixture direct tension fatigue test strain under controlled conditions , using multi-level multi - specimen method asphalt mixture cyclic stress - strain curve equation and strain - fatigue life curve equation , asphalt mixture cracking tensile strain threshold limit value . KT - Neuber formula method based on local strain theory , KF - Neuber formula method to calculate the local strain of the asphalt pavement . The load converted into the bottom of the asphalt surface stress concentration true strain , strain - local strain fatigue life curve and calculated the binding assays , come to life prediction of fatigue cracking of asphalt mixture .

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Asphalt Pavement
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