scholarly journals Laboratory Mix Design of Asphalt Mixture Containing Reclaimed Material

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Davide Lo Presti ◽  
Rawid Khan ◽  
Norhidayah Abdul Hassan ◽  
Gordon Airey ◽  
Andrew Collop
Keyword(s):  
Asphalt Mixture ◽  
Mix Design ◽  
Reclaimed Asphalt ◽  
X Ray ◽  
Concrete Mixtures ◽  
Homogeneous Test ◽  
Stone Mastic Asphalt ◽  
Gyratory Compaction ◽  
X Ray Computed ◽  
Compaction Method

This paper presents a study on the production of asphalt test specimens in the laboratory containing reclaimed asphalt. The mixtures considered were stone mastic asphalt concrete mixtures containing up to 30% of reclaimed asphalt. Specimens were compacted to the reference density obtained from the Marshall mix design. Gyration compaction method was used for preparing specimens for the experimental programme, while coring and cutting methods and X-ray computed tomography (CT) were used to investigate the change in properties within the specimens and to validate the selected methodology. The study concluded that gyratory compaction is suitable to produce homogeneous test specimens also for mixtures containing high amount of reclaimed asphalt. Nevertheless, preliminary trials for each material are mandatory, as well as final coring and trimming of the specimens due to side effects.

Preliminary Study on X-Ray Computed Tomography to Evaluate Voids in Porous Asphalt Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 345-353 ◽  
Author(s):  
J. D. Lin ◽  
Ming Chin Yeh ◽  
Po Hsun Sung ◽  
R. H. Shiu
Keyword(s):  
Computed Tomography ◽  
Asphalt Concrete ◽  
Mix Design ◽  
Air Voids ◽  
Porous Asphalt ◽  
X Ray ◽  
X Ray Computed ◽  
Preliminary Study ◽  
Porous Asphalt Concrete ◽  
Pore Clogging

The study applies Computed Tomography technology to probe into the porous asphalt concrete and air voids content, and at the same time, try to qualify accessible voids and closed voids and to use the result to evaluate the performance of porous asphalt concrete. The nominal maximum aggregate of this study is 19.0mm. In order to adjust the image of the gray threshold, the void of PAC specimen was obtained by cut-and-try method with the mix design. After scanning through the PAC specimen, the self-innovated software is used to calculate the Va(%), accessible voids and closed voids. After careful calculation, it showed that the accessible voids are about 20.3%, and the closed voids are about 1.15%. Base on the study, it could analyze the effect of pore clogging in PAC with improved the durability and lifetime.

Evaluation on Mix Design and Rutting Resistance of Dry Mixed Rubberised Asphalt Mixtures

2013 ◽  
Vol 65 (3) ◽  
Author(s):  
Norhidayah Abdul Hassan ◽  
Mohd Rosli Hainin ◽  
Haryati Yaacob ◽  
Che Ros Ismail ◽  
Nur Zurairahetty Mohd Yunus
Keyword(s):  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Asphalt Mixtures ◽  
Mix Design ◽  
Laboratory Evaluation ◽  
Modified Bitumen ◽  
Dry Process ◽  
Stone Mastic Asphalt ◽  
Wheel Tracking Test ◽  
Wheel Tracking

This study presents a laboratory evaluation on the properties of crumb rubber modified asphalt mixture using a dry process method in which the fine crumb rubber is added to substitute the aggregates portion and acts as elastic aggregates within the mix. The effect of crumb rubber in the mixture was investigated in terms of the volumetric properties using Marshall Mix Design and rutting performance using Wheel Tracking Test. The crumb rubber was added between 1 to 3% in steps of 1% by weight of aggregates to modify a dense graded mix, Asphaltic Concrete (AC14) and a gap graded mix, Stone Mastic Asphalt (SMA14) according to the Malaysian mix design. Based on the result, it was observed that the performance of the asphalt mixtures was significantly affected with the addition of crumb rubber. Rubberised asphalt mixtures for AC14 were found to have a greater resistance on rutting deformation compared to the conventional mixture. However, the use of fine rubber in SMA14 mixture with 80/100 bitumen cannot provide enough binder modification to perform as good as conventional SMA14 mixture with polymer modified bitumen. Furthermore, based on detailed review, a set of procedures for producing dry mixed rubberised asphalt mixture was identified and recommended for future studies.

scholarly journals RESEARCH OF BITUMINOUS BINDER WITH STABILIZING ADDITIVES BY INFRARED SPECTROSCOPY AND X-RAY SPECTRAL ANALYSIS

2020 ◽  
Vol 5 (11) ◽  
pp. 24-31
Author(s):  
D. Yastremskiy
Keyword(s):  
Spectral Analysis ◽  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Absorption Bands ◽  
Additional Absorption ◽  
X Ray ◽  
Mastic Asphalt ◽  
Petroleum Bitumen ◽  
Stone Mastic Asphalt ◽  
Sulfur Containing

Increasing the volume of crushed stone-mastic asphalt concrete used in the upper layers of road surfaces requires the development of effective stabilizing additives that ensure the uniformity of the asphalt mixture during short-term storage and transportation, as well as improving the properties of asphalt concrete. This additives include a complex stabilizing additive of the following composition: 90 % cellulose fibers from waste paper, 5 % rubber powder, 5 % viscous petroleum bitumen of the BND 90/130 brand. This article presents the results of a study of bitumen with the addition of "Viatop 66" and a complex cellulose-containing stabilizing additive (CSD). Using Fourier-transform spectroscopy, graphical data are obtained. as a result of their analysis, it is found that the interaction of stabilizing additives for crushed-mastic asphalt concrete with bitumen leads to the appearance of additional absorption bands characteristic of aromatic compounds (CH, benzene ring), sulfur-containing functional groups S=O st, R-SO-R, R-SO-OH, R-SO2-R, C=S st, as well as for C-O-H groups. X-ray spectral analysis confirmed the presence of additional sulfur-containing spectra in the composition of stabilizing additives. It is found that depending on the chemical composition of the stabilizing additives, the physical and mechanical characteristics of the bituminous binder and the resulting asphalt concrete change.

scholarly journals Study on Void Structure Reconstruction of Asphalt Mixture by X-Ray Computed Tomography and Otsu’s Method

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Jiantong Zhang ◽  
Jun Yang ◽  
Tiejun Liu ◽  
Rongxing Cai ◽  
Rui Yang
Keyword(s):  
Computed Tomography ◽  
Asphalt Mixture ◽  
Accurate Estimate ◽  
Asphalt Mixtures ◽  
Air Voids ◽  
X Ray ◽  
Sample Depth ◽  
Otsu’S Method ◽  
X Ray Computed ◽  
Air Void

The purpose of this paper is to obtain the pore distribution of asphalt mixture accurately by nondestructive technology. Specimens prepared with four gradations of asphalt mixtures were scanned using X-ray computed tomography (CT) which was used to measure air void sizes at different depths within specimens. The air void distributions of obtained CT images were analyzed using ring blocking segmentation combining Otsu’s method, which provided an accurate estimate of air voids in asphalt mixtures. The image processing results showed that air void distribution was not uniform in the specimens; higher air void concentrations were found at the top and bottom of the specimen, and lower, in the rest of the sample depth. The air void sizes of SUP13 and AC13 are mainly distributed between 0.15 to 0.2 mm, while PA13 and SMA13 are 0.4 to 0.65 mm and 0.4 to 0.7 mm, respectively. It is believed that the CT pictures processed by the ring blocking segmentation combining Otsu’s method is feasible and rational to capture the air voids size and content of asphalt mixtures.+

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