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Investigation of mineral filler effects on the aging process of asphalt mastics.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Investigation of mineral filler effects on the aging process of asphalt mastics./
Author:	Moraes, Raquel.
Description:	1 online resource (152 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 76-05, Section: B.
Contained By:	Dissertations Abstracts International76-05B.
Subject:	Civil engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781321309423

Investigation of mineral filler effects on the aging process of asphalt mastics.
Moraes, Raquel.

Investigation of mineral filler effects on the aging process of asphalt mastics. - 1 online resource (152 pages)

Source: Dissertations Abstracts International, Volume: 76-05, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2014.

Includes bibliographical references

Aging of asphalt binders is induced by chemical and/or physicochemical changes during production of pavement and throughout its service life. Although binder aging in pavement always occurs while binder is in contact with aggregates and mineral filler, in most laboratory aging studies, and in current specifications, asphalt binders are individually aged without accounting for aggregate induced interactions. Past research has had conflicting findings, attributing both mitigating and/or catalytic effects to the presence of mineral filler in asphalt binder with regards to oxidative aging. Thus, in the present study it was hypothesized that evaluation of asphalt oxidative aging without regard to interactive effect of the presence of mineral filler is inadequate as a specification tool. Effects of mineral fillers on oxidative aging of asphalt is investigated by means of accelerated aging of mastics (asphalt and fillers) in Pressure Aging Vessel (PAV). Testing matrix included aging evaluation of mastics containing different fillers content, mineralogy, and surface area. Results showed that low-temperature behavior of aged mastic can be modified by controlling filler concentration and type. Fillers acts as an agent adsorbing heavy fractions of asphalt binder, therefore reducing stiffness and changing glass-transition temperature. Also, during oxidative aging of asphalt binders and mastics, both diffusion and adsorption mechanisms play a role in the rate of aging of asphaltic material. A method to characterize the behavior of mastics with aging was also developed by monitoring the mastics |G*| aging index (ratio of complex modulus before and after aging). Gel Permeation Chromatography (GPC) testing results supported mentioned findings regarding |G*| changes, as the presence of mineral filler appears to decelerate the rate of production of larger molecular size oxidation products in the binder phase of mastics. Implication of the findings is that change in molecular size distribution of asphalts during aging - a controlling factor in mechanical and thermo-volumetric behavior - can be engineered by proper selection of fillers in the mastic phase. It is concluded that by selecting a proper type and concentration of filler, aging of pavement, or roofing shingles and, consequently, durability and performance, can be controlled.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9781321309423Subjects--Topical Terms:

561339
Civil engineering.
Subjects--Index Terms:

Asphalt binderIndex Terms--Genre/Form:

554714
Electronic books.

Investigation of mineral filler effects on the aging process of asphalt mastics.
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504 $a Includes bibliographical references
520 $a Aging of asphalt binders is induced by chemical and/or physicochemical changes during production of pavement and throughout its service life. Although binder aging in pavement always occurs while binder is in contact with aggregates and mineral filler, in most laboratory aging studies, and in current specifications, asphalt binders are individually aged without accounting for aggregate induced interactions. Past research has had conflicting findings, attributing both mitigating and/or catalytic effects to the presence of mineral filler in asphalt binder with regards to oxidative aging. Thus, in the present study it was hypothesized that evaluation of asphalt oxidative aging without regard to interactive effect of the presence of mineral filler is inadequate as a specification tool. Effects of mineral fillers on oxidative aging of asphalt is investigated by means of accelerated aging of mastics (asphalt and fillers) in Pressure Aging Vessel (PAV). Testing matrix included aging evaluation of mastics containing different fillers content, mineralogy, and surface area. Results showed that low-temperature behavior of aged mastic can be modified by controlling filler concentration and type. Fillers acts as an agent adsorbing heavy fractions of asphalt binder, therefore reducing stiffness and changing glass-transition temperature. Also, during oxidative aging of asphalt binders and mastics, both diffusion and adsorption mechanisms play a role in the rate of aging of asphaltic material. A method to characterize the behavior of mastics with aging was also developed by monitoring the mastics |G*| aging index (ratio of complex modulus before and after aging). Gel Permeation Chromatography (GPC) testing results supported mentioned findings regarding |G*| changes, as the presence of mineral filler appears to decelerate the rate of production of larger molecular size oxidation products in the binder phase of mastics. Implication of the findings is that change in molecular size distribution of asphalts during aging - a controlling factor in mechanical and thermo-volumetric behavior - can be engineered by proper selection of fillers in the mastic phase. It is concluded that by selecting a proper type and concentration of filler, aging of pavement, or roofing shingles and, consequently, durability and performance, can be controlled.
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