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University of Saskatchewan

1. Anthony, Anna Maria. Effects of manufactured fine aggregate on physical and mechanistic properties of Saskatchewan asphalt concrete mixes.

Degree: 2007, University of Saskatchewan

Saskatchewan Highways and Transportation (SDHT) rely on dense-graded hot mix asphalt concrete mixes for construction and rehabilitation of asphalt pavement surfaced highways. As a result of increased commercial truck traffic on the provincial road network, over the last two decades, some of Saskatchewan’s recently placed dense graded hot mix asphalt concrete (HMAC) pavements have been observed to show a susceptibility to premature permanent deformation in the asphalt mix. One of the aggregate properties thought to have significant influence on mix performance under traffic loading is the shape of the aggregate. Specifically, the physical properties of the fine aggregate (smaller than 5 mm in diameter) are of particular importance in dense graded mixes. Although empirical evidence suggests that there are performance benefits associated with using angular fine aggregate, the relationship of this parameter on mechanistic mix performance and resistance to permanent deformation has not yet been clearly defined.The primary objective of this research was to conduct laboratory analysis to determine the physical, empirical, and mechanistic behaviour sensitivity to the proportion of manufactured and natural fine aggregate in SDHT Type 72 hot mix asphalt concrete. The second objective of this research was to compare the mechanistic behaviour of the Type 72 mixes considered in this research to conventional SDHT Type 70 structural hot mix asphalt concrete.Physical and mechanistic properties of a SDHT Type 72 mix at levels of 20, 40, and 60 percent manufactured fines as a portion of total fines (smaller than 5 mm), and for a SDHT Type 70 mix (which contained 38 percent manufactured fines) were evaluated. Ten repeat samples were compacted for each mix using 75-blow Marshall compaction, and ten samples for each mix were compacted using the Superpave™ gyratory compaction protocols. Marshall stability and flow testing was conducted on the Marshall-compacted samples. Triaxial frequency sweep testing was conducted on the gyratory-compacted samples using the Rapid Triaxial Tester (RaTT) at 20°C. The testing was conducted at axial loading frequencies of 10 and 0.5 Hz, and at deviatoric stress states of 370, 425, and 500 kPa, respectively. The resulting dynamic modulus, axial and radial microstrains, Poisson’s ratio, and phase angle were evaluated.The research hypothesis stated that the increased amount of manufactured fines improves mechanistic properties of the Type 72 mix under typical field state conditions, and Type 72 mix with increased manufactured fines can exhibit mechanistic properties equivalent to or exceeding those of a typical type 70 mix. Based on the improved densification properties, increased Marshall stability, increased dynamic modulus, and reduced radial and axial strains, it was demonstrated that increasing manufactured fines content in the SDHT Type 72 mix does improve the mechanistic properties of this dense-graded asphalt mix. It should be noted that there appears to be a minimum level of manufactured… Advisors/Committee Members: Berthelot, Curtis, Sparling, Bruce F., Sparks, Gordon A., Pufahl, Dennis E., Chartier, Greg.

Subjects/Keywords: RaTT Cell; triaxial frequency sweep; dynamic modulus; mechanistic testing

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APA (6th Edition):

Anthony, A. M. (2007). Effects of manufactured fine aggregate on physical and mechanistic properties of Saskatchewan asphalt concrete mixes. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-04132007-162335

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Anthony, Anna Maria. “Effects of manufactured fine aggregate on physical and mechanistic properties of Saskatchewan asphalt concrete mixes.” 2007. Thesis, University of Saskatchewan. Accessed March 04, 2021. http://hdl.handle.net/10388/etd-04132007-162335.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Anthony, Anna Maria. “Effects of manufactured fine aggregate on physical and mechanistic properties of Saskatchewan asphalt concrete mixes.” 2007. Web. 04 Mar 2021.

Vancouver:

Anthony AM. Effects of manufactured fine aggregate on physical and mechanistic properties of Saskatchewan asphalt concrete mixes. [Internet] [Thesis]. University of Saskatchewan; 2007. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10388/etd-04132007-162335.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Anthony AM. Effects of manufactured fine aggregate on physical and mechanistic properties of Saskatchewan asphalt concrete mixes. [Thesis]. University of Saskatchewan; 2007. Available from: http://hdl.handle.net/10388/etd-04132007-162335

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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