A Study on Heat Deterioration of Asphalt by Thin Film Oven Test (Part 1)

DBSA was used as a solubilizer together with conventional rejuvenator (CR) to produce a solubilized rejuvenator (SR), two kinds of aged bitumen involving TFOT aged bitumen and PAV aged bitumen were obtained by thin film oven test (TFOT) and pressurized aging vessel (PAV), respectively. Effects of CR and SR on the physical properties, chemical components, colloidal structure and micro-morphology of TFOT aged bitumen and PAV aged bitumen were investigated. Testing results of physical properties and chemical components indicated that CR and SR can replenish aged bitumen with necessary aromatics, TFOT aged bitumen that chemical component variation deteriorates its physical properties. With regard to PAV aged bitumen, of which the performance attenuation lies in chemical components variation and colloidal structure transformation, even if the content of CR reached up to 10 wt %, the regenerated bitumen cannot meet the regeneration requirement yet due to its definite influence on colloidal structure transformation, comparatively, sulfonic group in SR can react with the superficial atoms of asphaltenes to reform a solvation layer to facilitate the colloidal structure transformation of PAV aged bitumen, performance and beelike structure of regenerated PAV aged with bitumen with 10 wt % SR were approximated to that of virgin bitumen.

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Pavement Performance and Anti-Aging Property of Microscale Flyash/SBS Modified Asphalt

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.1333 ◽

2010 ◽

Vol 663-665 ◽

pp. 1333-1336

Author(s):

Xin De Tang ◽

Xiang Li Kong ◽

Zhong Guo He ◽

Jun Li

Keyword(s):

Thin Film ◽

Thermal Stability ◽

Softening Point ◽

Pavement Performance ◽

Melt Blending ◽

Oven Test ◽

Modified Asphalt ◽

Deformation Ability ◽

Aging Property ◽

Sbs Modified Asphalt

Microscale flyash/SBS composite modified asphalts (CMA) were prepared by melt blending. Rolling thin film oven test (RTFOT) was employed to study the anti-aging property. Both flyash and SBS disperse homogeneously in the base asphalt, which lead to an improvement in terms of toughness, strength, and thermal stability. Moreover, microscale flyash plays a significant role in the CMA. The effect of flyash on the properties of SBS modified asphalt appears as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-deformation ability under high temperature of the CMA improved significantly. In comparison with that of the base asphalt, the softening point of the CMA decreases after aging, which maybe attribute to the different rheological properties between the CMA and the base asphalt. Compared to that of SBS modified asphalt, the anti-aging property of CMA improved significantly. This demonstrates that the microstructure of flyash can prevent oxygen from diffusing and permeating.

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Effect of De-Icing Additives on Aging Properties of Bitumen

Materials Science Forum ◽

10.4028/www.scientific.net/msf.847.418 ◽

2016 ◽

Vol 847 ◽

pp. 418-424

Author(s):

Wei Wang ◽

Jian Ying Yu ◽

Yi Yi ◽

Xiao Chen

Keyword(s):

Thin Film ◽

Layered Double Hydroxides ◽

Softening Point ◽

Experimental Result ◽

Uv Aging ◽

Oven Test ◽

Aging Properties ◽

Radiation Test ◽

Double Hydroxides ◽

Ultraviolet Aging

Effect of three de-icing additives: NaCl, wrapped NaCl (W-NaCl) and Layered double hydroxides (LDHs) on thermo-oxidative and ultraviolet aging properties of bitumen were investigated by thin film oven test (TFOT), pressure aging vessel (PAV) and ultraviolet (UV) radiation test. The experimental result illustrated that compared with bitumen with MF, the softening point and viscosity of bitumen with NaCl and W-NaCl increased and the ductility decreased distinctly after TFOT, PAV and UV aging, indicating that NaCl and W-NaCl accelerated the aging of bitumen. However, for bitumen with LDHs, the softening point and viscosity decreased significantly, the ductility increased after aging, which demonstrated that the anti-aging properties of bitumen were improved effectively by LDHs.

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