Resistance Of Asphalt Mixtures Research Articles

Fatigue damage evolution in asphalt mixture based on X-ray CT images

The fatigue damage of asphalt pavement occurs and develops under repeated vehicle loads, and its macro manifestation is the deterioration of mechanical properties and serviceability. In order to explore the internal cause of fatigue damage of asphalt mixtures, this paper proposed a method to obtain the internal section images of asphalt mixtures in different fatigue damage stages based on the X-ray CT (Computed Tomography) scanning technique and indirect tensile fatigue test. The fatigue damage evolutions in two different gradation types of AC and OGFC asphalt mixture were studied. The results show that the difference in gradation type causes different initial air void shapes, size and distribution, which result in different formation modes of the main cracks and fatigue damage resistance of asphalt mixture. The evolution of air voids during fatigue loading can be divided into three stages: compression, steady growth and rapid expansion. The macro fatigue damage presents an excellent linear relation (R-values > 0.98) with the internal structural damage.

Recent Advances in Basalt Fiber Reinforced Asphalt Mixture for Pavement Applications.

This paper conducts a thorough review of the literature on the feasibility and current state-of-the-art incorporation of basalt fiber (BF) into asphalt pavement materials, focusing on fiber characteristics, dosage, incorporation methods, mixture properties, and surface modification techniques. The optimum basalt fiber dosage should be determined based on engineering performance parameters such as asphalt type, fatigue cracking, thermal cracking, rutting, and moisture resistance of asphalt mixtures. Basalt fibers are added to asphalt mixes by dry method or mixed method to achieve better dispersion. Adding BF to asphalt mixtures increased performance characteristics like cracking resistance, rutting resistance, and fatigue resistance. Overall, incorporating BF into asphalt mixtures would lower costs while increasing pavement service life. More research is needed to fully understand the effects of different sizes of BF on pavement performance and the possible environmental and economic repercussions of fiber surface alteration.

Influence of fiber dispersion and distribution on flexural tensile properties of asphalt mixture Based on finite element simulation

• Basalt fibers can improve the low temperature crack resistance of asphalt mixture. • The Weibull distribution can approximately describe the fiber distribution in basalt fiber asphalt mortar. • Better reinforcement can be achieved by well dispersed basalt fibers. • The spatial distribution of fibers truly influence the flexural tensile properties of asphalt mixture. This study aims to reveal the relationship between the uneven distribution characteristics of basalt fibers and the flexural tensile performance of asphalt mixture. Nano Computed Tomography(nano-CT) was used to explore the realistic distribution features of basalt fibers in asphalt mortar. In addition, the distribution fitting and goodness of fit tests were carried out to find out the distribution form that can well describe the distribution of basalt fibers. The three-dimensional fiber models with different distribution forms were established in finite element software ABAQUS. Then the three-point bending test was simulated to analyze the influence of fiber dispersion and distribution on the flexural tensile properties of the asphalt mixture. Simulation results show that the asphalt mixture beam model shows better tensile resistance when the fibers are better dispersed. Moreover, when more basalt fibers are at the bottom of the middle span, it is more conducive to reducing the peak stress at the bottom of the beam and delaying the cracking of the asphalt mixture.

Evaluating fatigue resistance based on viscoelastic properties of asphalt mixtures

ABSTRACT In this study, the fatigue resistance of different asphalt mixture types subjected to the same aging condition was evaluated using linear viscoelastic properties of asphalt mixtures. The relaxation spectra were determined from the dynamic modulus test based on the linear viscoelastic theory, and the relationship between the parameters of relaxation spectra and the parameters of the storage modulus master-curves were developed. The Texas overlay test was conducted to evaluate the fatigue resistance with the number of load cycle to failure used as the measure of fatigue resistance. From the corresponding results, it is shown that the inflection point frequency of the dynamic modulus master-curves could be used to assess the fatigue resistance compared to other parameters. The Glover-Rowe parameter also exhibited a fair relationship with the fatigue resistance of the asphalt mixtures. The effect of the shape parameter (γ) of the dynamic modulus master-curves was quantified but seemed not very sensitive to fatigue resistance for the asphalt mixtures evaluated. In the study, a new parameter (VECIndex) was developed to evaluate the fatigue resistance, which considered the inflection point frequency and shape of the dynamic modulus master-curves, both of which influence the linear viscoelastic properties and fatigue resistance of asphalt mixtures.

Influence of ageing and moisture damage on the Illinois flexibility index value of polymer modified asphalt mixture

Asphalt pavements undergo ageing and moisture damage over the service life. The ageing and moisture process resulted in more cracking susceptibility and lowered pavement serviceability. Recently, the semi-circular bending (SCB) test has been widely utilised to characterise the fracture resistance of asphalt mixtures. In this study, the Illinois Flexibility Index Test (I-FIT) were utilised to investigate the impact of long-term ageing and moisture damage on the cracking resistance of asphalt mixtures modified by crumb rubber and plastic waste. This test is currently being adopted as a routine test in Illinois and has shown good correlations with the field cracking performance of asphalt mixture. For the Semi-Circular Bending (SCB) test, a sample width of 50 mm and a notch length of 15 mm was used for conducting the fracture test using a constant loading rate of 50 mm/min and a test temperature of 25 °C. The fracture energy-based crack mouth opening displacement of the control and modified mixtures was also evaluated using Digital Image Correlation (DIC). The results showed that the flexibility index (FI) values from the I-FIT are sensitive to the modifier type (elastomers or plastomers) and long-term ageing while underestimating the impact of moisture conditioning on the fracture performance of asphalt. Fracture energy results were higher for the rubberised mixture compared to the control and plastic waste modified asphalt mixture. Ageing condition has noticeably decreased the flexibility index (FI) of the rubberised mixture and consequently reduced the fracture performance.

Enhancement of the Rutting Resistance of Asphalt Mixtures at Different High Temperatures Using Waste Polyethylene Polymer

The temperature and stress caused by the load can be cited as two main parameters leading to breakage in asphalt pavement, especially rutting (permanent deformation). So, to reduce the problems of rutting of roads, several actions have been taken, including improving pavement quality and the structure design methods. The increase in the attention of respective engineers in the last few years to modify and improve the asphalt performance through providing different types of additives and replacing the raw materials of asphalt mixture with recycled materials to improve the environment and reduce the cost of modified pavement mixture. This study discussed the use of low-density waste polyethylene as an asphalt modifier in percentages of (2, 4, and 6) % by the weight of asphalt and their impact on the performance of asphalt mixtures at high temperatures. This study showed that using plastic waste (low-density polyethylene) as a bitumen modifier improved the performance of asphalt mixtures at different high temperatures. This was achieved by reducing the rut depth by (80.5) % and (82.3) % at temperatures of 50 C and 60 C, respectively, using low-density polyethylene waste at an optimum value of about 4% by weight of asphalt in addition to enhancing the Marshall stability by using this percentage of polymer.

The laboratory performance of asphalt mixture with thermoplastic polyurethane (TPU) and amorphous poly alpha olefin (APAO) compound modified asphalt binder

• The effect of TPU/APAO on the asphalt mixture performance was explored. • APAO could enhance the rutting resistance of TPU modified asphalt mixture. • TPU has positive impact on the cracking resistance of asphalt mixture. • 2 % TPU + 6 % APAO modified asphalt mixture had superior road performance. The using of waste polymer modified asphalt binder in pavement construction is cost effective and beneficial to the environment. In this paper, the modified asphalt binders are prepared by adding thermoplastic polyurethane (TPU, 0 %, 2 %, 4 %, 6 %, by weight of asphalt binder) and amorphous poly alpha olefins (APAO, 0 %, 2 %, 4 %, 6 %). The conventional physical, rotational viscosity and dynamic shear rheometer (DSR) tests were conducted on the modified binders and the results indicated that the addition of APAO could improve the rutting resistance the TPU modified asphalt binder, and the modified asphalt binder with 2 % TPU and 6 % APAO showed the best rutting resistance among the studied binders. To assess the effect of APAO dosage on the performance of TPU modified asphalt mixture, mechanical performance tests including Marshall stability, dynamic stability, indirect tensile, immersion Marshall, freeze–thaw splitting and long-term aging tests were carried out on asphalt mixtures with various TPU/APAO content combinations. The test results proved that 2 % TPU + 6 % APAO modified asphalt mixture showed better resistance to rutting and moisture damage, the superior long-term aging damage resistance, and the excellent anti-freeze–thaw damage ability, when compared to the unmodified asphalt mixture. According to the indirect tensile test results at −10 °C, despite the indirect tensile strength ( ITS ) value of 2 % TPU modified asphalt mixture decreased after APAO added, the ITS value of asphalt mixture modified with 2 % TPU and 6 % APAO was still improved 5.8 % than base asphalt mixture. Based on the comprehensive analysis of the data, 2 % TPU + 6 % APAO modified asphalt mixture has superior road performance, and the performance characteristic of TPU/APAO compound modified asphalt mixture indicated that it could be applied for warmer regions.

Aging resistance of asphalt mixture modified by polyolefin elastomer/styrene-butadiene-styrene block copolymer

Aging resistance of asphalt mixture modified by polyolefin elastomer/styrene-butadiene-styrene block copolymer

Investigation on low-temperature cracking characteristics of asphalt mixtures: A virtual thermal stress restrained specimen test approach

In order to characterize the effects of aggregate characteristics on the low-temperature cracking characteristics of asphalt mixtures, a virtual approach for the thermal stress restrained specimen test (TSRST) was established based on the discrete element method (DEM) and the simulation software particle flow code in two-dimension (PFC2D). A two-dimensional (2D) virtual specimen was established according to the random generation algorithm. The meso contact parameters between each phase in materials at different temperatures were determined through laboratory tests. The internal thermal stress curve of the specimen and the meso mechanism of crack propagation were analyzed during the virtual test, and the reliability of the virtual test was confirmed by the results of laboratory tests. Finally, the effects of aggregate properties on the low-temperature crack resistance of asphalt mixtures were analyzed. The results of the virtual test and the laboratory test are highly consistent, which proves that the virtual TSRST can be used as a reliable method to evaluate the low-temperature crack resistance of asphalt mixtures. The damage of the specimen can be divided into three stages: crack initiation, stable propagation, and unstable propagation. The asphalt mixture with less aggregate content, coarser gradation and smaller flat ratio has better low-temperature crack resistance.

Evaluating fatigue and crack resistance of asphalt mixture containing zinc tailing aggregates

Roads as one of the most important components of the transportation system involve a large quantity of construction aggregate. Limitation in natural-aggregates sources makes it necessary to use alternative materials as a substitute to natural-aggregates. To achieve this goal, the by-products tailings of zinc soil separation and concentration process named zinc tailings were used as an aggregate in asphalt mixture. In this research study, the fatigue, low-temperature, and moisture susceptibility performance of fabricated asphalt mixtures using limestone, siliceous and tailing aggregates were investigated. For this purpose, the four-point bending beam (4PB),semi-circular bending (SCB), and indirect tensile strength (ITS)tests were employed. Findings from 4PB tests indicate that asphalt mixture containing zinc tailings as aggregates have longer fatigue life than the mixture fabricated with limestone aggregates at the strain level of 600 microstrain. However, caution needs to be exercised at higher strain levels. Based on SCB test results, the fracture energy values for mixture with tailing aggregates were almost constant at temperatures of − 6, − 10, and − 12 °C while the results show fracture energy reduction for other mixtures at a lower temperature. Moreover, the cracking resistance index (CRI) indicates that the tailing aggregates fabricated mixture has acceptable low-temperature performance. Finally, the TSR values show that mixture containing zinc tailing aggregates are more resistant to moisture damage compared with siliceous fabricated mixture.

Laboratory performance of dense graded asphalt mixtures prepared using highly polymer modified binders containing corn oil as softening agent

• High Polymer Modified Asphalt (HPMA) with corn oil can resist short term aging. • Crack Propagation slows with HPMA and corn oil combination compared to Control. • Life Cycle Analysis shows the cost-effectiveness of the optimized combination of HPMA and Corn Oil. This study evaluated the impact of aging on High Polymer Modified Asphalt (HPMA) mixtures containing a softening agent (SA). The aging susceptibility was evaluated in terms of rutting, cracking, and durability. Four asphalt mixtures were prepared, one with PG 52–34 binder as control, and three others using modified PG 52–34 with varying dosages of Styrene Butadiene Styrene (SBS) and corn oil (SA). The tests performed to evaluate the impact of aging (short, long, extended long term) were the Dynamic Complex Modulus, Hamburg Wheel Tracking, Flow Number, Indirect Tension and semi-Circular Bend tests. Based on these testing results, SBS and SA increased the durability and rutting resistance of asphalt mixtures. Modified asphalt mixtures also showed better cracking resistance than the control mix (i.e. lowering of crack propagation). However, with aging, fatigue cracking performance diminished while remaining comparable to the control mix. A balanced dosage of SBS (7.5%) and SA (7%) led to the best improvement in durability, rutting, and short-term cracking performance.

Porosity of municipal solid waste incinerator bottom ash effects on asphalt mixture performance

Dispose and utilization of municipal solid waste incinerator bottom ash (MWSIBA) is one of the imperative issues in environmental protection. The applicability of substitution for natural aggregate with MWSIBA in asphalt mixture was investigated by the performance and micro structure of asphalt mixtures with diverse porosity levels of MWSIBA (varying the replacement percentage). The effects of porosity of MWSIBA on asphalt mixture performance were captured by determination of Marshall stability, tensile strength, dynamic stability and the maximum flexural-tensile strain. The horizontal vibration extraction procedure test was implemented for the heavy metal leaching concentration to evaluate the environmental safety of MWSIBA asphalt mixture. Chemical and micro-morphologic characterization for MSWIBA were conducted to explore the mechanism of moisture damage resistance of asphalt mixture. Results indicated that porosity and replacement rate of MWSIBA exerted impacts on properties of asphalt mixture. The rutting resistance of asphalt mixture decreased due to the addition of MWSIBA, resulting in a reduction in high temperature performance. MWSIBA with porosity no less than 19% was beneficial to the improvement of moisture susceptibility and low temperature performance of asphalt mixture, while high mixing amount of MWSIBA was unfavorable to the properties of asphalt mixture. The water immersion stimulated the hydration reaction in MWSIBA, leading to the formation of C-(A)-S-H gel with strong cementation property, which enhanced the adhesion between MWSIBA and asphalt binder. MWSIBA asphalt mixture presented lower heavy metal concentration and better environmental safety than MSWIBA.

Skid Resistance Performance of Asphalt Mixtures Containing Recycled Pavement Materials under Simulated Weather Conditions

One of the challenges of using recycled materials in road structures is to maintain safe and durable pavements. A multitude of research has been conducted over the years on various recycled materials, with a focus on the structural performance of pavements. Another crucial, but almost overlooked, aspect is the pavement’s ability to provide adequate skid resistance for road users under different climatic conditions. With this in mind, the present study aimed to investigate the skid resistance of asphalt mixtures containing two different types of recycled materials under laboratory-simulated weather conditions. Conventional hot-mix asphalt (HMA) and mixtures containing either reclaimed asphalt pavement (RAP) for aggregate replacement or crumb rubber (CR) as a bitumen additive were prepared and tested at different temperatures and different surface conditions (i.e., dry/wet) following a wetting protocol. Skid resistance was measured using a British Pendulum Tester (BPT). The results showed that the recycled mixtures performed similarly to conventional ones in terms of the skid resistance when the temperature was varied and under variable simulated surface conditions too. In some cases, they performed even better than conventional mixtures. Overall, a promising potential is demonstrated towards the use of the investigated recycled materials in asphalt surface courses.

Rutting Behaviour of Geopolymer and Styrene Butadiene Styrene-Modified Asphalt Binder.

Modifying asphalt binders is an effective method of improving the performance of asphalt pavement, such as its resistance to rutting. However, because modification changes the behaviour of binders, substantial laboratory testing is required before field application to determine the best mixtures. This research aimed to evaluate the impacts of temperature, stresses, polymer type, and modification rate on the rutting behaviour of the asphalt binder modified with fly-ash-based geopolymer (GF), styrene butadiene styrene (SBS), and a combination of SBS and GF. The rheological properties of asphalt binders were investigated using the frequency sweep test at various temperatures. Additionally, the multiple stress creep recovery test was conducted at various temperatures and stresses to calculate the non-recoverable creep compliance (J) and the percent strain recovery (R). The rutting resistance of asphalt mixture was assessed using the Hamburg wheel rut test. The results revealed that the asphalt binder with 8% geopolymer (8%GF) exhibited the best response in terms of complex shear modulus (G), rutting factor (G/sin), R, and J compared to the 4%GF and 12%GF at different temperatures. Another interesting finding is that GF’s use in the hybrid binder (2%SBS + 8%GF) led to a significant increase in the shear complex modulus and a decrease in the phase angle compared to the binder modified with 2%SBS. The geopolymer decreased the binder’s sensitivity to temperature for both unaged and RTFO asphalt binders. The hybrid binder would also improve strain recovery under high stress and temperatures and the ability to withstand severe traffic loads. Furthermore, there is a crucial relationship between temperature and J, which could help asphalt pavement designers select suitable modifiers considering the local climate and traffic volume.

Using two and three-parameter Weibull statistical model for predicting the loading rate effect on low-temperature fracture toughness of asphalt concrete with the ENDB specimen

Loading rate can affect significantly the load bearing capacity and cracking resistance of asphalt mixtures that are basically visco-elastic materials. On the other hand, the scatter of mechanical test results obtained from the asphalt mixtures (as multi ingredients and randomly distributed heterogeneous materials) would be high. Therefore, in this research the effect of loading rate on mode I fracture toughness of a fixed hot mix asphalt (HMA) mixture is investigated experimentally using several test replicates and the obtained data are analyzed using two and three parameter Weibull statistical models. The Edge Notch Disc Bend (ENDB) specimen, (that is a circular disc containing an edge crack along the diameter and loaded by three point bending) is utilized for conducting the KIc experiments under three loading rates of 0.5, 5 and 10 mm/min. For each loading rate, twenty five ENDB specimens are tested at a fixed low temperature of −12 °C and the probability of failure and Weibull distribution curves are obtained. It is shown that both two and three parameter Weibull models can be utilized successfully for predicting the mode I fracture behavior of tested asphalt material in the considered range for the loading rate. By increasing the loading rate from 0.5 to 10 mm/min, the mean KIc values and other Weibull parameters are increased. The Weibull distribution parameters obtained experimentally from the loading rates of 5 and 10 mm/min, are also predicted in terms of the Weibull parameters of the ENDB specimen tested at loading rate of 0.5 mm/min considered as a reference case.

Feasibility Study for Evaluating the Moisture Resistance of Asphalt Mixtures Containing RAP Using Pull-Off Test

Abstract Binder adhesion has an important effect on the properties of asphalt mixtures. In asphalt mixtures containing reclaimed asphalt pavement (RAP), rejuvenating agents have been used to restore the adhesive properties of an aged binder. In this study, a new rejuvenator was investigated to discover whether it can improve the moisture susceptibility of mixtures containing RAP. For this purpose, first, the effects of a new rejuvenator on the moisture resistance of binder compounds containing different percentages of aged binder were evaluated. Second, the moisture susceptibility of asphalt mixtures with different RAP contents (25, 50, 75, and 100 %) were investigated with and without rejuvenator utilization. The pull-off test was performed to evaluate the adhesion of binder compounds; indirect tensile strength and resilient modulus tests were utilized for evaluating the moisture susceptibility of the asphalt mixtures. Meanwhile, for the first time, the relationship between the pull-off test and the moisture susceptibility parameters of asphalt mixtures was established. The results indicate that the use of the rejuvenating agent improved the moisture resistance of the asphalt mixtures containing RAP as compared with the control mixture and mixtures without a rejuvenator. According to the obtained correlations, the pull-off test can be used as a rapid and economic test to estimate the moisture sensitivity of asphalt mixtures.

Characterization of mesoscale fracture damage of asphalt mixtures with basalt fiber by environmental scanning electron microscopy

The crack resistance of asphalt mixture determines the service life of asphalt pavement to a great extent. Pavement cracking is strongly influenced by the internal structures of asphalt mixtures, such as the aggregate skeleton and the interstitial components (i.e., fine aggregate matrix (FAM)). Basalt fiber is widely used for cracking resistance in asphalt mixtures because of its excellent mechanical properties. However, due to the lack of an effective real-time observation technique, the damage suppression mechanism of basalt fiber in the asphalt mixture is unclear.This study aims to develop a novel methodology that can effectively characterize the evolution of instantaneous damage of asphalt mixture with basalt fiber and assess its fracture properties. This methodology is based on the characterization of the FAM (i.e., the fine matrix portion that governs cracking performance) through a mesoscopic tension test termed the in-situ direct tension (ISDT) test. The mixtures with and without basalt fiber were designed for consideration. The semicircular bending (SCB) and the ISDT tests were conducted to compare the fracture properties between the asphalt mixture and FAM. The fracture property indices were calibrated using the feature parameters of force–displacement curves. The sigmoidal-shaped crack area density model was proposed with consideration of the full development of the cracking area density curve.The results show that the asphalt mixture and FAM have a comparable increasing trend in fracture energy and fracture toughness with the increase of basalt fiber content. The lagging effect of crack initiation and propagation was observed in fiber asphalt mixtures and FAM. The results indicate that the lagging effect of the asphalt mixture on the fine portion controls the crack propagation speed. It is valuable to investigate the fracture property of the fine portion rather than focusing on that of the whole asphalt mixtures. The proposed ISDT test can be recognized as an efficient implementation to evaluate the fracture performance of fiber asphalt mixtures.

Study on meso-structural characteristics and homogeneity of asphalt mixture skeleton contacts

Asphalt mixture skeleton is the main structure to resist load, and the contact point between coarse aggregates is one of the key elements of skeleton structure. This study investigated the difference in key aggregate particle size on the meso-contact characteristic and the distribution homogeneous of contact points. In addition, the relationship between the evaluation parameters of skeleton homogeneity and the macro-rutting resistance of asphalt mixtures was examined. Finally, various measures were proposed to improve the skeleton contact distribution homogeneity. The results indicated that the minimum calculated particle size significantly influenced the contact between coarse aggregates. The contact changes between coarse aggregates include increasing contacts, disappearing contacts, and changing contact positions. Measures to improve the contact distribution homogeneity of asphalt mixtures include increasing the compaction time, increasing the coarse aggregate content, and decreasing the key particle size. When the minimum calculated particle size was set to 2.36 mm, the anti-rutting parameters correlated with the statistical parameters of the coarse aggregate contact distribution. However, there was no good correlation between them when the minimum calculated particle size was 4.75 mm. These results suggest that when calculating the skeleton contact, the particle size of 2.36 mm is more reasonable to effectively characterize the mesostructure of the asphalt mixture skeleton.

Effects of Aggregate/Filler Characteristics on Semi-Circular Bend Fracture Parameters of Asphalt Concrete Mixtures Subject to Moisture Damage

The binder–aggregate adhesiveness plays an important role in preventing asphalt concrete adhesive fracture and it is greatly influenced by the chemical, physical, morphological, and mineralogical properties of aggregates. Many studies have attempted to assess fracture resistance of asphalt mixtures by evaluating parameters found from different laboratory fracture tests. Those parameters are related to the mixture components, and they can change when moisture conditions are induced. This study aims to investigate the effects of aggregate/filler characteristics on mixture fracture resistance including the effect of moisture damage. Two aggregates and four fillers with varied chemical compositions were selected and combined with one unmodified asphalt binder to design five different asphalt mixtures. Each aggregate and filler was tested to characterize physical, chemical, and morphological properties. Asphalt concrete mixtures samples, with and without being subjected to moisture conditioning, were submitted to the semi-circular bend (SCB) fracture test. Statistical analyses were performed to determine the level of significance on the parameter change resulting from the properties of particles and moisture conditioning. The results indicated that the type of aggregates did not present significant influence on the SCB fracture results when moisture conditioning was not involved. Also, the type of filler presented different trends on the parameter’s change when the samples were subjected to moisture. However, it was observed that the effects of aggregates and fillers on the fracture resistance of asphalt mixtures were pronounced when the SCB samples were subjected to moisture conditioning, because of the material-specific binder–aggregate adhesion in the presence of moisture.

Microwave heating mechanism and self-healing performance of asphalt mixture with basalt and limestone aggregates

Traditional asphalt mixtures can’t absorb microwave energy efficiently, which limits the development of microwave heating technology in the field of road maintenance. Based on the microwave heating characteristics of basalt aggregates, the overall microwave self-healing rate of the asphalt mixture can be enhanced. The basalt was tested by XRF, XPS, XRD and electromagnetic parameters to reveal its microwave heating mechanism. Through the heating rate test, SCB test and fatigue test of asphalt mixture, its heating characteristics, flexural strength, fatigue resistance and self-healing performance were studied. The results showed that the excellent wave-absorbing properties of basalt are highly correlated with the elements of Si, Fe and Al. Its TanδM was slightly larger than TanδE, which indicated that basalt can absorb microwave energy through dielectric loss and magnetic loss. The aggregate type and particle size both affected the microwave heating rate of the aggregates. After microwave heating, the flexural strength and fatigue resistance of asphalt mixture with basalt and limestone aggregates can recover at least 65% and 23% respectively.