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You searched for subject:(Granular Subbase). Showing records 1 – 2 of 2 total matches.

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University of Waterloo

1. Schneider, Adam C. Sustainable Alternative Materials in Unbound Granular Layers of Pavement Structures.

Degree: 2017, University of Waterloo

In Part 1 of this thesis, reclaimed cement concrete (commonly referred to as recycled concrete aggregate or RCA) and reclaimed asphalt pavement (RAP) are investigated as potential alternative construction materials for Granular B Type II subbase fill. Ontario Provincial Standard Specification (OPSS) 1010 currently allows the common use of processed reclaimed construction materials in a variety of road base, subbase and asphaltic concrete layers, with the notable exception of Granular B Type II, which at present may only include 100% crushed bedrock, talus, iron blast furnace slag or nickel slag. As more restrictions are placed on zoning and approvals for new natural aggregate extraction sites in Ontario, there is a need to better understand the performance of materials such as RCA and RAP as economically beneficial potential aggregate sources for granular base and subbase fill layers. An experimental program was created to assess and analyze the performance characteristics of a series of different subbase test mixtures incorporating RCA and/or RAP, either pure or blended with crushed bedrock, and the impact of the inclusion of these materials when compared to a conventional 100% crushed bedrock test mix meeting OPSS 1010 requirements for Granular B Type II. The performance characteristics to be assessed were field compactibility, gradations before and after field compaction, physical properties, standard and modified Proctor tests, California Bearing Ratio (CBR), permeability, resilient moduli and lightweight deflectometer (LWD) resilient moduli. Field testing programs conducted at Quarry 1 in Ottawa, Ontario and Quarry 2 in Burlington, Ontario indicate that the subbase test mixtures meeting OPSS Granular B Type II gradation requirements and incorporating different proportions of crushed rock, RCA and/or RAP exhibit similar field rolling compactibility relative to 100% crushed rock. Grain size analysis testing showed some aggregate breakdown in multiple test mixes, with only minimal increases in material passing the 75 ┬Ám sieve, which is crucial to preserving permeability and drainage characteristics. Tests using a lightweight deflectometer (LWD) were subject to substantial variability but indicated that mixes using elevated levels of RCA (50% and 100%) can potentially have lower in-situ moduli compared to the other blends tested. Laboratory tests indicate that high replacement levels of RCA can be used in subbase materials as a substitute for 100% crushed rock while maintaining good water permeability characteristics and similar or higher resilient moduli in blends incorporating RCA and/or RAP. CBR testing results were similar across all test blends incorporating crushed rock and RCA, but also indicated that the inclusion of 30% RAP can potentially reduce the bearing capacity of the granular material by approximately 30-40% in comparison to all other blends which do not contain RAP. Based on the overall results of this study, RCA and RAP appear to be capable of successfully substituting for natural…

Subjects/Keywords: Sustainable Materials; Pavement Sustainability; Granular Subbase; Foam Glass; Lightweight Aggregate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Schneider, A. C. (2017). Sustainable Alternative Materials in Unbound Granular Layers of Pavement Structures. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/11842

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):

Schneider, Adam C. “Sustainable Alternative Materials in Unbound Granular Layers of Pavement Structures.” 2017. Thesis, University of Waterloo. Accessed November 19, 2017. http://hdl.handle.net/10012/11842.

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

MLA Handbook (7th Edition):

Schneider, Adam C. “Sustainable Alternative Materials in Unbound Granular Layers of Pavement Structures.” 2017. Web. 19 Nov 2017.

Vancouver:

Schneider AC. Sustainable Alternative Materials in Unbound Granular Layers of Pavement Structures. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2017 Nov 19]. Available from: http://hdl.handle.net/10012/11842.

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

Council of Science Editors:

Schneider AC. Sustainable Alternative Materials in Unbound Granular Layers of Pavement Structures. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/11842

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


McMaster University

2. Lam, Andrew. Resilient Moduli of Flexible Pavement Materials.

Degree: ME, 1982, McMaster University

The behaviour of asphaltic concrete, granular base and subbase materials, and subgrade soils in repeated dynamic loading is best represented by their resilient moduli in rational flexible pavement designs. The recoverable, or resilient, strains in pavement structures due to repetitions of moving traffic loads can be predicted through the use of appropriate material parameters in analytical or numerical models of pavement response. It appears that the repeated-load triaxial test offers the most promising means of applying simulated field loading conditions to representative samples of flexible pavement components. This testing of laboratory or field prepared samples provides a good estimate of the material 1 s overall dynamic behaviour and the desired resilient modulus and Poisson's ratio for design analyses. The purpose of this research was to simulate field loading conditions for a range of typical Southern Ontario granular base and subbase materials by means of repeated-load, variable and constant confining pressure, triaxial tests using laboratory research equipment readily adaptable to regular design use. The pavement materials were characterized in a condition corresponding to optimum density and moisture content with repeated loadings representative of field stress conditions of 0.1 second pulse duration at a frequency of 20 cycles per minute. In addition to determining the resilient modulus and Poisson 1 s ratio for four basic conditions -unsaturated drained, unsaturated undrained, partially saturated drained, partially saturated undrained -the results were examined for significant trends. The characterization of typical base, subbase and subgrade materials for Southern Ontario, coupled with previous work on asphaltic concrete, allows the use of representative moduli for all flexible pavement components in Ontario pavement design systems such as OPAC.

Thesis

Master of Engineering (ME)

Advisors/Committee Members: Emery, John . J, Civil Engineering.

Subjects/Keywords: asphaltic concrete, granular base, subbase materials; subbase, subgrade, Southern Ontario

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lam, A. (1982). Resilient Moduli of Flexible Pavement Materials. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/18797

Chicago Manual of Style (16th Edition):

Lam, Andrew. “Resilient Moduli of Flexible Pavement Materials.” 1982. Masters Thesis, McMaster University. Accessed November 19, 2017. http://hdl.handle.net/11375/18797.

MLA Handbook (7th Edition):

Lam, Andrew. “Resilient Moduli of Flexible Pavement Materials.” 1982. Web. 19 Nov 2017.

Vancouver:

Lam A. Resilient Moduli of Flexible Pavement Materials. [Internet] [Masters thesis]. McMaster University; 1982. [cited 2017 Nov 19]. Available from: http://hdl.handle.net/11375/18797.

Council of Science Editors:

Lam A. Resilient Moduli of Flexible Pavement Materials. [Masters Thesis]. McMaster University; 1982. Available from: http://hdl.handle.net/11375/18797

.