Effect of mineral filler on changes in molecular size distribution of asphalts during oxidative ageing

Moraes, Raquel; Bahia, Hussain U.

doi:10.1080/14680629.2015.1076998

Cited by 43 publications

(16 citation statements)

References 24 publications

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“…According to Superpave method of mix design, the maximum amount of filler (particles smaller than 0.075mm) to be used in an asphalt concrete is 10% by weight of aggregate [22]. In addition to limiting the maximum amount of filler incorporated into asphalt concrete, the current design standard requires incorporation of mineral filler be limited to a ratio in a range of 0.6-1.2 by mass of filler to bitumen [23], [24], and, simultaneously, the gradation of the overall aggregate (including fillers) must fall within the specification limits [25]. For producing ECAC, Wu, et al, [2] maintained a bitumen-to-filler ratio of around 1:1 and their asphalt concrete specimens were composed of 6.5-7.5% bitumen, 7.4% of fillers (consisting of 4 limestone powder and conductive fillers) and 85.6% basalt aggregates.…”

Section: Specimen Fabricationmentioning

confidence: 99%

Electrically-conductive asphalt mastic: Temperature dependence and heating efficiency

et al. 2018

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Asphalt mastic, a pitch-matrix composite, consists of bitumen and mineral fillers (very fine aggregates), that fills the voids created by coarser aggregates in asphalt concrete. In this study, asphalt mastic was modified with carbon fiber (CF) and graphite powder (GP) to produce single-phase (containing only CF) and two-phase (containing both CF and GP) electrically-conductive asphalt mastic (ECAM) for anti-icing and deicing applications. Volume resistivities of ECAMs were measured at two different temperatures and the influence of temperature on electrical conductivity was evaluated, revealing that reduction in temperature enhances the ECAM's electrical conductivity. After analyzing the volume resistivity data for both single-phase and twophase ECAM specimens, heat generation efficiency of single-phase ECAM was investigated at a conductive material dosage slightly higher than the optimum. The heat generation efficiency was evaluated at a belowfreezing temperature by performing active infrared thermography (IRT). Based on the active IRT analysis results, it was found that single-phase ECAM at the selected CF content is capable of generating enough heat for melting ice and snow or preventing accumulation of snow and formation of ice.

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Section: Specimen Fabricationmentioning

confidence: 99%

Electrically-conductive asphalt mastic: Temperature dependence and heating efficiency

et al. 2018

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“…Equation (4) shows the aging indexes calculated from the molecular weight parameters [40]. Figure 11 depicts the calculated results for the mastics after the salt “DW-FT” cycles.…”

Section: Resultsmentioning

confidence: 99%

“…The samples were prepared following the procedure described by Moraes et al [40]. First, approximately 20 mg of the mastic samples were dissolved in THF in a 10 mL volumetric flask for 30 min while hand shaking was applied (Figure 3).…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Microcharacteristics of Asphalt Mastics under Dry–Wet and Freeze–Thaw Cycles in a Coastal Salt Environment

Zhang

Huang

2019

Materials

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In the coastal areas of southeastern China, high temperatures and humidity in the summer and microfreezing in the winter, as well as a high concentration of salt spray in the environment, seriously deteriorate the durability of asphalt mixtures. Therefore, the microcharacteristics of asphalt mastics (asphalt mixed with mineral filler) under the effect of chlorine salt and “dry–wet and freeze–thaw” (DW-FT) cycles were investigated by Fourier-transform infrared (FTIR) spectroscopy, gel permeation chromatography (GPC), and atomic force microscopy (AFM) techniques. Two factors, including asphalt mastic types (base and styrene-butadiene-styrene (SBS)-modified mastics) and numbers of DW-FT cycles, were considered based on the natural environment. Regression functions were established to explore the relationship between the FTIR, GPC, and AFM indexes. The results indicate that there were no chemical reactions between the asphalt and filler because the infrared spectrum of the base and SBS-modified mastics were similar. With the increase of the salt “DW-FT” cycle numbers, the sulfoxide index and large molecular size ratios ( L M S % ) increased, and the surface roughness ( R q and R a ) of the morphology decreased, as illustrated by a flatting mastics surface phenomenon in the AFM test. Regression analysis confirmed that there was a high correlation between the FTIR, GPC, and AFM indexes, and formation of the bee structures was closely related to the long chain index. The SBS-modified mastics had a better antiaging performance with a lower increase in the sulfoxide index after the salt “DW-FT” cycles in the coastal environment.

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“…Mastics were prepared by adding the filler at a filler/bitumen ratio of 0.8 by bitumen weight by the general mastic preparation method (Moraes & Bahia, 2015; Xing et al ., 2020). Furthermore, the AC‐13 gradation was adopted to design the bituminous mixture according to the Technical Specifications for Construction of Highway Asphalt Pavement of China (China, 2004).…”

Section: Methodsmentioning

confidence: 99%

Analysis of the nanoscale phase characteristics of bitumen and bitumen in mastics and mixtures via AFM

Xing

Liu

2020

Journal of Microscopy

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Summary A peak force quantitative nanomechanical mode (PF‐QNM) can be used to simultaneously measure the topographical and nanomechanical property maps of samples. Currently, few studies used this mode to investigate the phase characteristics of bitumen in mastics and mixtures. The present study adopted hot‐bitumen‐pouring methods to prepare base bitumen surface samples and further used frozen‐storage and low‐temperature‐cutting methods to prepare the internal samples of base bitumen in mastics and mixtures. Then, the atomic force microscopy (AFM) PF‐QNM mode was used to collect data on the topographical and nanomechanical properties of bitumen and bitumen in mastics and mixtures. The results indicated that a typical bee structure only appeared on the bitumen surface. In contrast to the bitumen surface, the bitumen interior showed two phases, A‐ and B‐phase, which were close in some properties to the periphase and paraphase of the bitumen surface, respectively. Furthermore, the addition of mineral aggregates affected the phase characteristics of the free bitumen interior. With an increase in the mineral aggregate surface area, the proportion of A‐phase decreased and that of B‐phase increased in the free bitumen interior. Lay Description Bitumen is a complex mixture of hydrocarbons primarily applied for pavement materials. In the pavement industry, the bituminous mixture is a multilevel system, in which bitumen acts as a binder binding the aggregates and fillers to form bituminous mixture. Currently, atomic force microscopy (AFM), which is an advanced microscopy technology, has been used to investigate bitumen surface phase characteristics at the nanoscale. However, few studies have directly explored the nanoscale phase characteristics of bitumen in mastics or mixtures. Recently, with the progress of technology, a peak‐force‐quantitative‐nanomechanical mode (PF‐QNM) can be used to simultaneously measure the topographical and nanomechanical property maps of samples. Relying on this advanced mode, this study analyzed the nanoscale phase characteristics of the bitumen surface and interior, and further explored the effect of mineral aggregates on bitumen interior phase characteristics. In detail, we used hot‐bitumen‐pouring methods to prepare bitumen surface samples and adopted frozen‐storage and low‐temperature‐cutting methods to prepare the internal samples of bitumen in mastics and mixtures. Subsequently, AFM PF‐QNM mode was used to collect topographical and nanomechanical property maps of bitumen and bitumen in mastics and mixtures. The results indicated that the bitumen interior only consisted of two phases, where the A‐phase presented low adhesion, deformation, and dissipation, while the B‐phase presented high adhesion, deformation, and dissipation. A‐phase and B‐phase of the bitumen interior were close to the periphase and paraphase of the bitumen surface, respectively. Furthermore, the addition of mineral aggregates significantly affected the bitumen interior phase characteristics.

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Effect of mineral filler on changes in molecular size distribution of asphalts during oxidative ageing

Cited by 43 publications

References 24 publications

Electrically-conductive asphalt mastic: Temperature dependence and heating efficiency

Electrically-conductive asphalt mastic: Temperature dependence and heating efficiency

Investigation of the Microcharacteristics of Asphalt Mastics under Dry–Wet and Freeze–Thaw Cycles in a Coastal Salt Environment

Analysis of the nanoscale phase characteristics of bitumen and bitumen in mastics and mixtures via AFM

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