Document Type : Original Article
Authors
1
Assist.Prof, Department of Civil Engineering, Payame Noor University, Tehran, Iran
2
Assoc.Prof, Department of Industrial Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
3
Ph.D. Candidate, Department of Civil Engineering, Payame Noor University, Tehran, Iran
10.22034/tri.2022.353425.3070
Abstract
Abstract
Freeze-thaw cycles are among the most important climatic factors that change the mechanical properties of pavement concrete, and play an important role in creating cracks and also affect the growth mechanism of cracks. Concrete pavement damage caused by environmental factors including daily and seasonal fluctuations in humidity and temperature profiles, changes in groundwater level, precipitation/ infiltration, freeze-thaw cycles and other external factors, are completely modeled in the mechanistic-empirical design method (ME). The effects of melting and freezing are experienced in the substrates, but ultimately cause damage to the pavement surface. In order to analyze the sensitivity of JPCP concrete pavement to freeze-thaw cycles, in this study, the sensitivity of the resilient modulus (Mr) of the base material against these cycles and also against the groundwater level was analyzed using enhanced integrated climate model (EICM). For this purpose, the fluctuations of modulus adjustment factors (F_env) against various variables such as technical characteristics of base materials, number of days elapsed since ice melting, groundwater table level and saturation degree of materials were calculated and then, the sensitivity of the base layer resilient modulus to changing the adjustment factors was evaluated. Then, using the normal sensitivity index (NSI), the change in the damage potential of this type of pavement was analyzed. The results showed the potential for vulnerability of jointed plain concrete pavement (in terms of faulting, cracking and roughness) to freeze-thaw cycles to be "Extremely Sensitive".
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