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Subgrade-Associated Factorial Influences on Fatigue Cracking of Cement Concrete Pavement

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2017

Key Words:

Author NameUniversity of Author
Abstract (2. Language): 
Cracking is a kind of normal distress of cement concrete pavement, which occurs frequently under cyclic loads and reduces the pavement performance and shortens the pavement life substantially. In this paper, a general numerical model for cracking damage of cement concrete pavement under traffic loads is established, a series of analyses were carried out based on the general model with tailored parameters to analyze the influences of subgrade and associated factors on cracking index and sensitivity. The results show that subgrade stiffness has a great influence on fatigue cracking of cement concrete pavement, the damage accumulated in periods with low subgrade stiffness plays a pivotal role in fatigue cracking. The axle types and the subgrade stiffness have correlated influences on the destructive effect of the cement slab and the adaptability of different axle types. The combined effect of increasing the cement slab thickness and the modulus of rupture of cement concrete, reducing axle weight, load cycles and improving subgrade modulus result in an apparent increase of the fatigue cracking life. However, the sensitivity of the fatigue cracking life on the slab thickness, the modulus of rupture of cement concrete and the single-axle weight become weaker with the improvement of subgrade modulus. The increase of the base layer thickness can improve the fatigue cracking life definitely, but has no obvious influence on the relative change rate of CI varying with the subgrade stiffness. The interaction between the subgrade stiffness and the base thickness on the sensibility of fatigue cracking under traffic loads is very slight.
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REFERENCES

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International Journal of Science and Engineering Investigations, Volume 6, Issue 62, March 2017 104
www.IJSEI.com Paper ID: 66217-11
ISSN: 2251-8843
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