Investigation of low temperature cracking in asphalt concrete pavement

Qadir, Adnan
In this study, low temperature cracking of asphalt concrete is investigated based on a laboratory experimental program including the design variables of aggregate type, gradation, asphalt content, binder grading, binder modification, and the experimental variables of cooling rate, and specimen size. The design of experiment is proposed according to the fractional factorial design principles to reduce the required number of test specimens. Mix designs are performed according to the Superpave mix design guidelines using materials obtained from the Turkish General Directorate of High-ways. In the course of this study, a test setup for thermal stress restrained specimen test for asphalt concrete is developed and used successfully to test a number of as-phalt concrete beam specimens. The same setup is also used for measuring the glass transition temperatures to obtain various thermo-volumetric properties of mixtures. Statistical methods are used to identify the effect of experimental variables on frac-ture strength, fracture temperature and other dependent variables obtained from the testing program. Statistical models are also developed to predict the fracture strength, fracture temperature and other thermo-volumetric properties of mixtures. Results of analyses show that aggregate type, binder modification, and asphalt content significantly affect both the fracture strength and fracture temperature of asphalt concrete. While the glass transition temperature is affected by only aggregate type, coefficients of contraction before and after the glass transition temperature are not influenced by any of the experimental variables. The results of this study provide an important basis to prevent low temperature cracking in asphalt concrete pavements.


The Influence of different mixture design variables on thermal fatigue cracking of asphalt concrete pavements /
Arabzadeh, Ali; Güler, Murat; Department of Civil Engineering (2014)
In this study, in order to investigate the thermal fatigue resistance of naturally-aged asphalt concrete specimens, an experimental setup is developed. Mixture design variables, selected according the superpave method of design, include asphalt content, asphalt type, aggregate type, gradation and modification. In the course of this study, using the developed setup, thermal coefficients and thermal fatigue life of the asphalt concrete specimens are measured. Then, using the analysis of variance tests the sig...
Effects of mixture design parameters and compaction methods on the properties of roller compacted concrete pavements
Şengün, Emin; Yaman, İsmail Özgür; Department of Civil Engineering (2019)
The aim of the thesis is to develop laboratory compaction methodology suitable for simulating field compaction procedures used for creating roller compacted concrete (RCC) mixtures. Based on this methodology, mechanical performance and fracture properties of RCC mixtures of different strength classes were determined and long-term fatigue performance of RCC mixtures with different strength levels was investigated. In this context, a three-phase experimental study was designed. First, mixtures with different ...
Investigation of variations in performance properties of asphalt concrete using image-based finite element model
Karakaya, Yalçın; Güler, Murat; Department of Civil Engineering (2022-7-20)
The objective of this study is to evaluate variations in performance properties of asphalt concrete using a two-dimensional image-based finite element model. Two different asphalt mixtures are used in both laboratory tests and in FEM analyses representing different conditions. A flatbed scanner is then used to capture cross-sectional images of the samples and various image processing techniques are applied to prepare the images for FEM. A unique image vectorization method has been developed to transform cro...
Investigation of the impact of aggregate segregation on rutting resistance of asphalt concrete
Yücel, Ayhan Öner; Güler, Murat.; Department of Civil Engineering (2019)
In this study, effect of aggregate segregation on rutting resistance of asphalt concrete is investigated using laboratory compacted specimens. A procedure to determine inhomogeneity level is proposed using 2-dimensional cross section images of asphalt concrete specimens. A redistribution algorithm is developed to assess the aggregate distribution characteristics and inhomogeneity index of the cross sectional images. In order to simulate field conditions, specimens are produced in two different groups: (i) w...
Comparison of jointed plain concrete pavement systems designed by mechanisticempirical (M-E) method for different traffic, subgrade, material and climatic conditions Farkli trafik, zemin, malzeme ve iklim kosullari için mekanistik-ampirik (M-E) yöntemle tasarlanan derzli donatisiz rijit üstyapi sistemlerinin karsilastirilmasi
Öztürk, Hande Işık; ŞENGÜN, EMİN; Yaman, İsmail Özgür (2019-01-01)
In pavement design, traditional empirical catalog methods leave their place to next generation mechanistic-empirical (M-E) design methods that utilize cracking, faulting and roughness as pavement performance parameters. Within the scope of this study, the effects of different traffic, subgrade and concrete strength classes for 20 and 40 year's service periods on the thickness and joint spacing of JPCP are determined by M-E design method for ten regions representing different climatic classes. A total of 360...
Citation Formats
A. Qadir, “Investigation of low temperature cracking in asphalt concrete pavement,” Ph.D. - Doctoral Program, Middle East Technical University, 2010.