Internal structure evolution of asphalt mixtures during freeze–thaw cycles

2015 ◽  
Vol 86 ◽  
pp. 436-446 ◽  
Author(s):  
Huining Xu ◽  
Wei Guo ◽  
Yiqiu Tan
Keyword(s):  
Internal Structure ◽  
Asphalt Mixtures ◽  
Structure Evolution ◽  
Freeze Thaw

scholarly journals Characterization of Three-Dimensional Internal Structure Evolution in Asphalt Mixtures during Freeze–Thaw Cycles

2021 ◽  
Vol 11 (9) ◽  
pp. 4316
Author(s):  
Gang Xu ◽  
Xianhua Chen ◽  
Xing Cai ◽  
Yunhong Yu ◽  
Jun Yang
Keyword(s):  
Internal Structure ◽  
Asphalt Mixture ◽  
Three Dimensional ◽  
Asphalt Mixtures ◽  
Structure Evolution ◽  
Void Content ◽  
3D Images ◽  
X Ray ◽  
Freeze Thaw ◽  
Before And After

This paper aims to characterize the three-dimensional (3D) internal structure evolution of asphalt mixtures under freeze–thaw cycles. Asphalt mixtures with three levels of design void content (3%, 5%, and 7%) were prepared in the laboratory. Subsequently, X-ray computed tomography (CT) tests were conducted to capture two-dimensional (2D) images of the internal structure of samples before and after freeze–thaw testing. A set of image processing techniques for reconstructing 3D images of the internal structure were utilized to extract the internal structure properties, which were then used to analyze the changes in the air void distributions and to evaluate the internal structure evolution under freeze–thaw cycles. 3D images reconstructed from X-ray CT images illustrated a dramatic degradation in the internal structure after cyclic freeze–thaw exposure. The change in internal structure occurs mainly in three ways: (1) expansion of existing individual voids, (2) combination of two separated air voids, and (3) generation of new voids. In addition, the parametric analysis of the three-dimensional reconstructed voids revealed that the asphalt mixture void ratio increased with the number of freeze–thaw cycles, while the larger the initial void content, the more pronounced the increase in the specimens. Therefore, asphalt mixture freeze–thaw resistance should be optimized in relation to the design void content.

Kinetics of internal structure evolution in gypsum board exposed to standard fire

2013 ◽  
Vol 31 (5) ◽  
pp. 395-409 ◽  
Author(s):  
Amandine Rojo ◽  
Yannick Mélinge ◽  
Olivier Guillou
Keyword(s):  
Internal Structure ◽  
Structure Evolution ◽  
Gypsum Board ◽  
Standard Fire ◽  
Kinetics Of

Degradation of asphalt mixtures with glass aggregates subjected to freeze-thaw cycles

2017 ◽  
Vol 141 ◽  
pp. 8-15 ◽  
Author(s):  
Éric Lachance-Tremblay ◽  
Daniel Perraton ◽  
Michel Vaillancourt ◽  
Hervé Di Benedetto
Keyword(s):  
Asphalt Mixtures ◽  
Freeze Thaw

Effectiveness of Loaded Wheel Tracking Test to Ascertain Moisture Susceptibility of Asphalt Mixtures

2021 ◽  
pp. 036119812110363
Author(s):  
Moses Akentuna ◽  
Louay N. Mohammad ◽  
Sanchit Sachdeva ◽  
Samuel B. Cooper ◽  
Samuel B. Cooper
Keyword(s):  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Moisture Damage ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Creep Recovery ◽  
Moisture Susceptibility ◽  
Freeze Thaw ◽  
Wheel Tracking ◽  
Mixture Samples

Moisture damage of asphalt mixtures is a major distress affecting the durability of asphalt pavements. The loaded wheel tracking (LWT) test is gaining popularity in determining moisture damage because of its ability to relate laboratory performance to field performance. However, the accuracy of LWT’s “pass/fail” criteria for screening mixtures is limited. The objective of this study was to evaluate the capability of the LWT test to identify moisture susceptibility of asphalt mixtures with different moisture conditioning protocols. Seven 12.5 mm asphalt mixtures with two asphalt binder types (unmodified PG 67-22 and modified PG 70-22), and three aggregate types (limestone, crushed gravel, and a semi-crushed gravel) were utilized. Asphalt binder and mixture samples were subjected to five conditioning levels, namely, a control; single freeze–thaw-; triple freeze–thaw-; MiST 3500 cycles; and MiST 7000 cycles. Frequency sweep at multiple temperatures and frequencies, and multiple stress creep recovery tests were performed to evaluate asphalt binders. LWT test was used to evaluate the asphalt mixture samples. Freeze–thaw and MiST conditioning resulted in an increase in stiffness in the asphalt binders as compared with the control. Further, freeze–thaw and MiST conditioning resulted in an increase in rut depth compared with the control asphalt mixture. The conditioning protocols evaluated were effective in exposing moisture-sensitive mixtures, which initially showed compliance with Louisiana asphalt mixture design specifications.

Internal structure evolution of L12 variants in aged Fe-Ga alloys

2020 ◽  
Vol 836 ◽  
pp. 155282 ◽  
Author(s):  
Junming Gou ◽  
Tianzi Yang ◽  
Xiaolian Liu ◽  
Tianyu Ma
Keyword(s):  
Internal Structure ◽  
Structure Evolution

scholarly journals Study on Viscoelastic Properties of Asphalt Mixtures Incorporating SBS Polymer and Basalt Fiber under Freeze–Thaw Cycles

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1804
Author(s):  
Wensheng Wang ◽  
Guojin Tan ◽  
Chunyu Liang ◽  
Yong Wang ◽  
Yongchun Cheng
Keyword(s):  
Viscoelastic Properties ◽  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Asphalt Mixtures ◽  
Freeze Thaw ◽  
Static Creep ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Static Creep Test ◽  
Butadiene Styrene

This study aims to study the viscoelastic properties of asphalt mixtures incorporating styrene–butadiene–styrene (SBS) polymer and basalt fiber under freeze–thaw (F-T) cycles by using the static creep test. Asphalt mixture samples incorporating styrene–butadiene–styrene (SBS) polymer and basalt fiber were manufactured following the Superpave gyratory compaction (SGC) method and coring as well as sawing. After 0 to 21 F-T cycles processing, a uniaxial compression static creep test for the asphalt mixture specimens was performed to evaluate the influence of F-T cycles. The results indicated that the F-T cycles caused a larger creep deformation in the asphalt mixtures, which led to a decrease in the rut resistance of the asphalt mixtures incorporating SBS polymer and basalt fiber. Besides, the resistance to deformation decreased significantly in the early stage of F-T cycles. On the other hand, the viscoelastic parameters were analyzed to discuss the variation of viscoelastic characteristics. The relaxation time increased with F-T cycles, which will not be conducive to internal stress dissipation. Compared with lignin fiber, basalt fiber can improve the resistance to high-temperature deformation and the low-temperature crack resistance of asphalt mixtures under F-T cycles.

Impact of salt and freeze–thaw cycles on performance of asphalt mixtures in coastal frozen region of China

2010 ◽  
Vol 62 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Decheng Feng ◽  
Junyan Yi ◽  
Dongsheng Wang ◽  
Liangliang Chen
Keyword(s):  
Asphalt Mixtures ◽  
Freeze Thaw

Experiment Study of Water Stability of Fiber-Reinforced Asphalt Mixture

2011 ◽  
Vol 243-249 ◽  
pp. 710-716 ◽  
Author(s):  
Ying Chun Cai ◽  
Yuan Xun Zheng
Keyword(s):  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Asphalt Mixtures ◽  
Water Stability ◽  
Fiber Reinforced ◽  
Freeze Thaw ◽  
Optimum Dosage ◽  
Splitting Strength ◽  
Splitting Test ◽  
Marshall Test

To study the influence of fiber on the water stability of asphalt mixtures, the optimum dosage of asphalt and fibers are studied by the method of Marshall test and rut test. The results demonstrate that the optimum dosage of asphalt and fibers are 4.63% and 0.30%, respectively. Then the improved effects of basalt fiber on water stability of asphalt mixtures are evaluated through immersed Marshall test and freeze-thaw splitting test according to related specifications. The results show that the freeze-thaw splitting strength and splitting strength without freeze-thaw of fiber-reinforced asphalt mixture are improved to some extent compared with control mixture. Splitting strength without freeze-thaw of basalt, polyester and xylogen fiber-reinforced asphalt mixture is increased by 36.4%, 15.4% and 6.2%, and freeze-thaw splitting strength is increased by 55.2%, 28.7% and 14.5%. It can be concluded that fiber can remarkably improved the water stability of asphalt mixtures, besides; the improvement effects of basalt fiber are superior to polyester fiber and xylogen fiber.

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