The Experts below are selected from a list of 5016 Experts worldwide ranked by ideXlab platform
Jianzhong Pei - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of rheological master curves of asphalt Mastics and asphalt-filler interaction indices
Construction and Building Materials, 2020Co-Authors: Ruyi Wei, Jiupeng Zhang, Jianzhong PeiAbstract:Abstract Understanding the rheological behavior of the asphalt Mastic is an important step towards improving the shear-stress response of the mixture. The objective of this study is to observe the rheological master curves and the asphalt-filler interaction of the asphalt Mastics in the linear viscoelastic (LVE) range by using various rheological indices. The frequency sweep (FS) test was utilized to investigate the influence factors of the rheological indexes and the applicability of the asphalt-filler interaction indexes. Simultaneously, the correlation of various asphalt-filler interaction indices was established. The results showed that the influence of filler volume fraction and the aging effect exhibited a stonger significant effect on the rheological indices were significantly stronger than that of the binder type and filler type. The aging effect could reduce the difference in the rheological indices between various Mastics. The analysis of the asphalt-filler interaction indices showed that the addition of the modifier had a negtive effect on the critical filler volume fraction (Φm) of the Mastic. Moreover, the indices of the complex modulus coefficient (△G*), K.D.Ziegel-B-G* (K-B-G*) and complex viscosity coefficient (△η*) presented the consistency in evaluating the asphalt-filler interaction ability. The value of K-B-G* increased with the aging degree, that is, the filler-asphalt interaction increased with aging degree
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evaluation indices of asphalt filler interaction ability and the filler critical volume fraction based on the complex modulus
Road Materials and Pavement Design, 2017Co-Authors: Jiupeng Zhang, Guoqiang Liu, Cunzhen Zhu, Jianzhong PeiAbstract:The asphalt–filler interaction plays a significant role in the performances of asphalt Mastics and mixtures, and the asphalt–filler interaction ability could be evaluated by the rheological properties. In this paper, two kinds of matrix asphalt binders and six kinds of fillers were selected to prepare asphalt Mastic with different filler volume fractions, and the dynamic shear rheological properties of asphalt Mastics were measured and analysed. The filler critical volume fraction which is the transition point from “diluted region” to “concentrated region” for asphalt Mastic was defined and determined according to the variation of asphalt Mastic’s complex modulus with filler volume fractions. In the “diluted region”, the asphalt–filler interaction plays a dominant role in the increasing of complex modulus. However, the interaction between filler particles plays a dominant role in the “concentrated region”. Then, the complex modulus coefficient ΔG*, the Einstein coefficient KE and the coefficient K−B−G* we...
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Effects of temperature and loading frequency on asphalt and filler interaction ability
Construction and Building Materials, 2016Co-Authors: Jiupeng Zhang, Guoqiang Liu, Hu Zhuang, Cunzhen Zhu, Jianzhong Pei, Long JinAbstract:The asphalt and filler interaction plays a significant role on the performances of asphalt Mastics and mixtures, and the asphalt and filler interaction ability is affected by the temperature and loading frequency. In this paper, two kinds of matrix asphalt binders and three kinds of fillers were selected to prepare asphalt Mastic with different filler volume fractions, and the dynamic shear rheological properties of asphalt Mastics were measured. The linear viscoelastic range of matrix asphalt binder and Mastic was analyzed firstly. Then the K-B-G∗ model was used to evaluate and analyze the influence of temperature and loading frequency on asphalt and filler interaction ability. The results show that the linear viscoelastic range of matrix asphalt binders decreases with the loading frequency increasing and increases with the temperature increasing, the linear viscoelastic range of asphalt Mastics decreases with the filler volume fraction increasing at the constant temperature and loading frequency. K-B-G∗ exponentially increases with the temperature increasing and linearly decreases with the loading frequency increasing. The significance analysis of temperature and loading frequency was conducted by using grey correlated method, and finding that the temperature has deeper influence than loading frequency.
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micromechanics prediction of effective modulus for asphalt Mastic considering inter particle interaction
Construction and Building Materials, 2015Co-Authors: Jianzhong Pei, Jiupeng Zhang, Zepeng Fan, Pengzhi Wang, Bin XueAbstract:Abstract This paper presents the development and validation of a new micromechanical model, Ju–Chen (J–C) model, to predict the effective viscoelastic modulus of asphalt Mastic by considering the inter-particle interaction. Based on the approximate solutions for two-particle interaction problem, the radial distribution function is integrated into the ensemble-volume averaged eigenstrain tensor so as to consider the inter-particle interaction, and the solution could be extended and simplified to predict the effective complex modulus of asphalt Mastic with different filler volume fractions. It is found that the inter-particle interaction increases with the filler volume fraction and decreases with the test frequency, and the predictions agree well with the experiment data at low and moderate filler volume fractions, not exceeding 50%. Compared with two commonly used micromechanical models (M–T model and DSEM model), the J–C model relatively gives the best estimation of the effective modulus of Mastics, and the applicability of J–C model could be further improved.
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research on interaction between asphalt and filler based on dsr test
Advanced Materials Research, 2013Co-Authors: Jiupeng Zhang, Jianzhong PeiAbstract:To explain the interactive effect between asphalt and fillers in the asphalt Mastic, it is probably to start with an assessment of the rheology properties, since asphalt Mastics are viscoelastic materials. In this study, firstly prepare the asphalt Mastics with different dosage of limestone filler, and the volume fractions of fillers were 0, 14, 24, 32, 39 and 45%. And then, the same asphalt is mixed with different fillers, such as cement and hydrated lime, and the volume fractions of fillers were 18, 23, 28and 33%. DSR test was conducted on all of the asphalt Mastic specimens to measure the complex shear modulus G* at different temperature. The volume filling effects and interaction between asphalt and filler are discussed on the analysis of complex shear modulus coefficient and Nielsens model model. It is obviously that G* of asphalt Mastics decrease with the test temperature, but increase with the volume fraction of filler. A function relation between complex shear modulus coefficient and volume fraction of fillers is established, and the interaction coefficient α is proposed. For limestone, cement and hydrated lime filler, the interaction coefficient α values are 0.301, 0.317 and 0.429 respectively. Based on Nielsens model and DSR test data, the Einstein coefficient KE is calculated, and Einstein coefficients are 3.761, 5.09 and 7.44 for asphalt-limestone Mastic, asphalt-cement Mastic and asphalt-hydrated lime Mastic respectively. Both the interaction coefficient α and Einstein coefficient KE can be used to represent the interaction between asphalt binder and filler. The bigger value means the better interaction.
Jiupeng Zhang - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of rheological master curves of asphalt Mastics and asphalt-filler interaction indices
Construction and Building Materials, 2020Co-Authors: Ruyi Wei, Jiupeng Zhang, Jianzhong PeiAbstract:Abstract Understanding the rheological behavior of the asphalt Mastic is an important step towards improving the shear-stress response of the mixture. The objective of this study is to observe the rheological master curves and the asphalt-filler interaction of the asphalt Mastics in the linear viscoelastic (LVE) range by using various rheological indices. The frequency sweep (FS) test was utilized to investigate the influence factors of the rheological indexes and the applicability of the asphalt-filler interaction indexes. Simultaneously, the correlation of various asphalt-filler interaction indices was established. The results showed that the influence of filler volume fraction and the aging effect exhibited a stonger significant effect on the rheological indices were significantly stronger than that of the binder type and filler type. The aging effect could reduce the difference in the rheological indices between various Mastics. The analysis of the asphalt-filler interaction indices showed that the addition of the modifier had a negtive effect on the critical filler volume fraction (Φm) of the Mastic. Moreover, the indices of the complex modulus coefficient (△G*), K.D.Ziegel-B-G* (K-B-G*) and complex viscosity coefficient (△η*) presented the consistency in evaluating the asphalt-filler interaction ability. The value of K-B-G* increased with the aging degree, that is, the filler-asphalt interaction increased with aging degree
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evaluation indices of asphalt filler interaction ability and the filler critical volume fraction based on the complex modulus
Road Materials and Pavement Design, 2017Co-Authors: Jiupeng Zhang, Guoqiang Liu, Cunzhen Zhu, Jianzhong PeiAbstract:The asphalt–filler interaction plays a significant role in the performances of asphalt Mastics and mixtures, and the asphalt–filler interaction ability could be evaluated by the rheological properties. In this paper, two kinds of matrix asphalt binders and six kinds of fillers were selected to prepare asphalt Mastic with different filler volume fractions, and the dynamic shear rheological properties of asphalt Mastics were measured and analysed. The filler critical volume fraction which is the transition point from “diluted region” to “concentrated region” for asphalt Mastic was defined and determined according to the variation of asphalt Mastic’s complex modulus with filler volume fractions. In the “diluted region”, the asphalt–filler interaction plays a dominant role in the increasing of complex modulus. However, the interaction between filler particles plays a dominant role in the “concentrated region”. Then, the complex modulus coefficient ΔG*, the Einstein coefficient KE and the coefficient K−B−G* we...
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Effects of temperature and loading frequency on asphalt and filler interaction ability
Construction and Building Materials, 2016Co-Authors: Jiupeng Zhang, Guoqiang Liu, Hu Zhuang, Cunzhen Zhu, Jianzhong Pei, Long JinAbstract:The asphalt and filler interaction plays a significant role on the performances of asphalt Mastics and mixtures, and the asphalt and filler interaction ability is affected by the temperature and loading frequency. In this paper, two kinds of matrix asphalt binders and three kinds of fillers were selected to prepare asphalt Mastic with different filler volume fractions, and the dynamic shear rheological properties of asphalt Mastics were measured. The linear viscoelastic range of matrix asphalt binder and Mastic was analyzed firstly. Then the K-B-G∗ model was used to evaluate and analyze the influence of temperature and loading frequency on asphalt and filler interaction ability. The results show that the linear viscoelastic range of matrix asphalt binders decreases with the loading frequency increasing and increases with the temperature increasing, the linear viscoelastic range of asphalt Mastics decreases with the filler volume fraction increasing at the constant temperature and loading frequency. K-B-G∗ exponentially increases with the temperature increasing and linearly decreases with the loading frequency increasing. The significance analysis of temperature and loading frequency was conducted by using grey correlated method, and finding that the temperature has deeper influence than loading frequency.
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micromechanics prediction of effective modulus for asphalt Mastic considering inter particle interaction
Construction and Building Materials, 2015Co-Authors: Jianzhong Pei, Jiupeng Zhang, Zepeng Fan, Pengzhi Wang, Bin XueAbstract:Abstract This paper presents the development and validation of a new micromechanical model, Ju–Chen (J–C) model, to predict the effective viscoelastic modulus of asphalt Mastic by considering the inter-particle interaction. Based on the approximate solutions for two-particle interaction problem, the radial distribution function is integrated into the ensemble-volume averaged eigenstrain tensor so as to consider the inter-particle interaction, and the solution could be extended and simplified to predict the effective complex modulus of asphalt Mastic with different filler volume fractions. It is found that the inter-particle interaction increases with the filler volume fraction and decreases with the test frequency, and the predictions agree well with the experiment data at low and moderate filler volume fractions, not exceeding 50%. Compared with two commonly used micromechanical models (M–T model and DSEM model), the J–C model relatively gives the best estimation of the effective modulus of Mastics, and the applicability of J–C model could be further improved.
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research on interaction between asphalt and filler based on dsr test
Advanced Materials Research, 2013Co-Authors: Jiupeng Zhang, Jianzhong PeiAbstract:To explain the interactive effect between asphalt and fillers in the asphalt Mastic, it is probably to start with an assessment of the rheology properties, since asphalt Mastics are viscoelastic materials. In this study, firstly prepare the asphalt Mastics with different dosage of limestone filler, and the volume fractions of fillers were 0, 14, 24, 32, 39 and 45%. And then, the same asphalt is mixed with different fillers, such as cement and hydrated lime, and the volume fractions of fillers were 18, 23, 28and 33%. DSR test was conducted on all of the asphalt Mastic specimens to measure the complex shear modulus G* at different temperature. The volume filling effects and interaction between asphalt and filler are discussed on the analysis of complex shear modulus coefficient and Nielsens model model. It is obviously that G* of asphalt Mastics decrease with the test temperature, but increase with the volume fraction of filler. A function relation between complex shear modulus coefficient and volume fraction of fillers is established, and the interaction coefficient α is proposed. For limestone, cement and hydrated lime filler, the interaction coefficient α values are 0.301, 0.317 and 0.429 respectively. Based on Nielsens model and DSR test data, the Einstein coefficient KE is calculated, and Einstein coefficients are 3.761, 5.09 and 7.44 for asphalt-limestone Mastic, asphalt-cement Mastic and asphalt-hydrated lime Mastic respectively. Both the interaction coefficient α and Einstein coefficient KE can be used to represent the interaction between asphalt binder and filler. The bigger value means the better interaction.
Francesco Canestrari - One of the best experts on this subject based on the ideXlab platform.
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influence of different fillers and sbs modified bituminous blends on fatigue self healing and thixotropic performance of Mastics
Road Materials and Pavement Design, 2019Co-Authors: Giorgia Mazzoni, Amedeo Virgili, Francesco CanestrariAbstract:The prediction of asphalt pavement performance is closely linked to the behaviour of Mastic, consisting of filler and bitumen, which can be modelled as viscoelastic material. The purpose of this study is to investigate the effect of different fillers and bituminous blends on Mastic fatigue response, considering recoverable phenomena in viscoelastic materials (thixotropy and self-healing) that concurrently occur. Three fillers (limestone, basalt and Portland cement) and three aged polymer modified bitumen contents (0%, 45% and 100%) were blended with a virgin polymer modified bitumen obtaining nine Mastics characterised in terms of fatigue, self-healing and thixotropy using a Dynamic Shear Rheometer. Data obtained are analysed through a model previously adopted for polymer modified bitumens and Mastics, allowing the determination of the fatigue endurance limit. Results show that the presence of filler with increasing particle density and/or Rigden voids causes a higher Mastic stiffness without a clear tren...
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fatigue self healing and thixotropy of bituminous Mastics including aged modified bitumens and different filler contents
Construction and Building Materials, 2017Co-Authors: Giorgia Mazzoni, Arianna Stimilli, Fabrizio Cardone, Francesco CanestrariAbstract:Abstract Bituminous Mastic is a self-healing viscoelastic material. Recoverable phenomena, such as thixotropy and self-healing capability, are recognised as an important resource for the development of sound road pavements. The experimental investigation described in this paper and carried out through a Dynamic Shear Rheometer (DSR) provides a comparison among Mastics blended with different percentages of aged polymer modified bitumen, new virgin polymer modified bitumen and filler in terms of fatigue, self-healing and thixotropy. Data analysis is based on a model adopted in previous studies for polymer modified bitumens in order to calculate the fatigue endurance limit. Results show that the presence of increasing percentages of filler causes detrimental effects on Mastic fatigue performance which can be offset by the addition of a certain amount of aged polymer modified bitumen. In fact, regardless of the filler content considered, a percentage of aged polymer modified bitumen (up to 45%) added to Mastics enhances the fatigue endurance limit suggesting significant benefits when dealing with sustainable recycled mixtures containing Reclaimed Asphalt (RA) aggregates.
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self healing capability and thixotropy of bituminous Mastics
International Journal of Fatigue, 2016Co-Authors: Giorgia Mazzoni, Arianna Stimilli, Francesco CanestrariAbstract:Abstract Fatigue resistance of bituminous materials is related to time-dependent phenomena, such as damage accumulation, hardening, viscoelasticity, thixotropy and healing. In bituminous mixtures, damage related to fatigue processes mainly involves bitumen and its combination with filler (i.e. Mastic). Currently, there is no consolidated method for the determination of the fatigue endurance limit of bitumens that takes into account also the above-mentioned phenomena, while limited work has been done on Mastics. To bridge this gap, the experimental investigation described in this paper provides a comparison between bitumens and corresponding Mastics in terms of fatigue, self-healing and thixotropy. Long term aged materials were also taken into consideration in order to identify potential detrimental effects on self-healing due to oxidation phenomena, evaluating the possible inclusion of Reclaimed Asphalt (RA) for the production of bituminous mixtures. The data analysis was based on an innovative test method which had previously been implemented for bitumens and was carried out using a Dynamic Shear Rheometer (DSR). Moreover, the influence of morphological properties of filler on filler-bitumen interactions was assessed by means of a Scanning Electron Microscope (SEM). Results show that the above-mentioned analysis method is also suitable for analysing bituminous Mastics and is able to identify the role of filler as well as the influence of ageing on the self-healing process of bituminous materials. The investigation confirms that a certain amount of aged bitumen added to a virgin bitumen/Mastic is able to considerably improve the overall fatigue performance suggesting significant benefits when dealing with recycled mixtures including RA aggregates.
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influence of mineral fillers on the rheological response of polymer modified bitumens and Mastics
Journal of Traffic and Transportation Engineering, 2015Co-Authors: Fabrizio Cardone, F Frigio, Gilda Ferrotti, Francesco CanestrariAbstract:The rheological properties of the bituminous components (bitumen and bituminous Mastic) within asphalt mixtures contribute significantly to the major distresses of flexible pavements (i.e. rutting, fatigue and low temperature cracking). Asphalt mixtures are usually composed of Mastic-coated aggregates rather than pure bitumen-coated aggregates. The purpose of this study is to investigate the effects of mineral fillers on the rheological behaviour of several polymer-modified bitumens (PMBs) through laboratory mixing. A neat bitumen and two types of polymers (elastomeric and plastomeric) were used to produce PMBs, and two fillers with different minerals (limestone and basalt) were selected to obtain Mastics. The dynamic shear rheometer (DSR) and bending beam rheometer (BBR) were used to characterize the rheological properties of PMBs and Mastics. In particular, multiple stress creep recovery (MSCR) tests were performed to evaluate the rutting potential at high temperatures, whereas BBR tests were carried out to investigate the low temperature behaviour of these materials. BBR results for unmodified Mastics show that the increase of stiffness is similar regardless of the filler type, whereas results for polymer-modified Mastics indicate that the degree of stiffening depends on the combination of filler/polymer types. MSCR results show that adding filler leads to a reduced susceptibility of permanent deformation and an enhanced elastic response, depending on the combination of filler/polymer types. Overall results suggest that a physical–chemical interaction between the filler and bitumen occurs, and that the interaction level is highly dependent on the type of polymer modification.
Yue Xiao - One of the best experts on this subject based on the ideXlab platform.
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initial self healing temperatures of asphalt Mastics based on flow behavior index
Materials, 2018Co-Authors: Guanyu Tao, Yue XiaoAbstract:Increasing temperature is a simple and convenient method to accelerate the self-healing process of bitumen. However, bitumen may not achieve the healing capability at lower temperature, and may be aged if temperature is too high. In addition, the bitumen is mixed with mineral filler and formed as asphalt Mastic in asphalt concrete, so it is more accurate to study the initial self-healing from the perspective of asphalt Mastic. The primary purpose of this research was to examine the initial self-healing temperature of asphalt Mastic, which was determined by the flow behavior index obtained from the flow characteristics. Firstly, the texture and geometry characteristics of two fillers were analyzed, and then the initial self-healing temperature of nine types of asphalt Mastic, pure bitumen (PB) and styrene-butadiene-styrene (SBS) modified bitumen were determined by the flow behavior index. Results demonstrate that the average standard deviation of gray-scale texture value of limestone filler (LF) is 21.24% lower than that of steel slag filler (SSF), showing that the steel slag filler has a better particle distribution and geometry characteristics. Also the initial self-healing temperatures of asphalt Mastics with 0.2, 0.4 and 0.6 LF-PB volume ratio are 46.5 °C, 47.2 °C and 49.4 °C, which are 1.4 °C, 0.8 °C and 0.4 °C higher than that of asphalt Mastics with SSF-PB, but not suitable for the evaluation of asphalt Mastic contained SBS modified bitumen because of unique structure and performance of SBS.
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Initial Self-Healing Temperatures of Asphalt Mastics Based on Flow Behavior Index
MDPI AG, 2018Co-Authors: Guanyu Tao, Yue XiaoAbstract:Increasing temperature is a simple and convenient method to accelerate the self-healing process of bitumen. However, bitumen may not achieve the healing capability at lower temperature, and may be aged if temperature is too high. In addition, the bitumen is mixed with mineral filler and formed as asphalt Mastic in asphalt concrete, so it is more accurate to study the initial self-healing from the perspective of asphalt Mastic. The primary purpose of this research was to examine the initial self-healing temperature of asphalt Mastic, which was determined by the flow behavior index obtained from the flow characteristics. Firstly, the texture and geometry characteristics of two fillers were analyzed, and then the initial self-healing temperature of nine types of asphalt Mastic, pure bitumen (PB) and styrene-butadiene-styrene (SBS) modified bitumen were determined by the flow behavior index. Results demonstrate that the average standard deviation of gray-scale texture value of limestone filler (LF) is 21.24% lower than that of steel slag filler (SSF), showing that the steel slag filler has a better particle distribution and geometry characteristics. Also the initial self-healing temperatures of asphalt Mastics with 0.2, 0.4 and 0.6 LF-PB volume ratio are 46.5 °C, 47.2 °C and 49.4 °C, which are 1.4 °C, 0.8 °C and 0.4 °C higher than that of asphalt Mastics with SSF-PB, but not suitable for the evaluation of asphalt Mastic contained SBS modified bitumen because of unique structure and performance of SBS
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effects of steel slag fillers on the rheological properties of asphalt Mastic
Construction and Building Materials, 2017Co-Authors: Zongwu Chen, Jun Xie, Yue XiaoAbstract:Abstract The primary objective of this article was to investigate the feasibility of steel slag as fillers, particularly the fillers milled from raw steel slag with different particle size, also the steel slag fillers’ effects on rheological properties of asphalt Mastics. Four types of fillers were analyzed, including limestone filler (LF) and three steel slag fillers obtained by milling different raw Basic Oxygen Furnace (BOF) steel slags whose original particle sizes were 0–9.5 mm (ASSF, type A Steel Slag Filler), 9.5–13.2 mm (BSSF, type B Steel Slag Filler) and 13.2–26.5 mm (CSSF, type C Steel Slag Filler) separately. Surface characteristics, chemical compositions, phase distributions, thermal properties of fillers were first studied. By applying Bending Beam Rheometer (BBR) at lower temperature and Dynamic Shear Rheometer (DSR) at higher temperature, the rheological properties of asphalt Mastics were also investigated. Results show that along with the increase of raw steel slag’s particle size, the Fe content in steel slag filler presented a growing trend obviously. Besides that, compared with LF, steel slag fillers have different surface characteristics, chemical compositions, phase distributions and thermal properties. Furthermore, all steel slag fillers presented outstanding rheological properties, which indicated that they can be used as potential materials to replace LF. Moreover, ASSF corresponding Mastic owned the best high-temperature rheological properties while BSSF corresponding Mastic revealed the most balanced low-temperature rheological properties.
Long Jin - One of the best experts on this subject based on the ideXlab platform.
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Effects of temperature and loading frequency on asphalt and filler interaction ability
Construction and Building Materials, 2016Co-Authors: Jiupeng Zhang, Guoqiang Liu, Hu Zhuang, Cunzhen Zhu, Jianzhong Pei, Long JinAbstract:The asphalt and filler interaction plays a significant role on the performances of asphalt Mastics and mixtures, and the asphalt and filler interaction ability is affected by the temperature and loading frequency. In this paper, two kinds of matrix asphalt binders and three kinds of fillers were selected to prepare asphalt Mastic with different filler volume fractions, and the dynamic shear rheological properties of asphalt Mastics were measured. The linear viscoelastic range of matrix asphalt binder and Mastic was analyzed firstly. Then the K-B-G∗ model was used to evaluate and analyze the influence of temperature and loading frequency on asphalt and filler interaction ability. The results show that the linear viscoelastic range of matrix asphalt binders decreases with the loading frequency increasing and increases with the temperature increasing, the linear viscoelastic range of asphalt Mastics decreases with the filler volume fraction increasing at the constant temperature and loading frequency. K-B-G∗ exponentially increases with the temperature increasing and linearly decreases with the loading frequency increasing. The significance analysis of temperature and loading frequency was conducted by using grey correlated method, and finding that the temperature has deeper influence than loading frequency.
