Dissertation
Experimental assessment of the short- and long-term one-dimensional compression behavior and hydraulic properties of unbound light weight coarse aggregate
Doctor of Philosophy (Ph.D.), Drexel University
Dec 2021
DOI:
https://doi.org/10.17918/00000921
Abstract
This dissertation addresses the need for some additional insight on the constitutive behavior of unbound light weight coarse aggregate. It is the intent of the author to provide information concerning the compressive behavior of Lightweight-Foamed Glass Aggregates (LWA-FG) under varying compactive effort loading conditions as well as one-dimensional (1-D) short-term compressive loading. Additionally, 1-D long-term compressive loading was evaluated to estimate the creep and stress relaxation behavior of the LWA-FG. The impact on the hydraulic behavior of the LWA-FG was also evaluated to determine the flow capacity as a result of breakage and degeneration of the particles due to the various loading conditions. The goal of this dissertation is to provide useful performance-based test evaluations and data to allow a more informed design solution using LWA-FG. Additionally, this dissertation puts forth the use of the Fineness Modulus (FM) and the percent of loss (% Loss) in particle size related to coarse and fine grain aggregates to correlate to the amount of breakage and degeneration of the particles due to the various loading conditions evaluated with respect to compactive energy and 1-D compressive loading. The results indicate that LWA-FG aggregate can have significant particle breakage as a function of increase in compactive effort or applied confining pressure. The mechanical properties of the LWA-FG aggregate improve with the increase in compactive effort or applied confining pressure. However, the particle breakage of LWA-FG aggregate does not significantly impact the free draining permeability of the material. Additionally, the long-term 1-D creep behavior of the LWA-FG aggregate up to 3,000 psf (144 kPa) is very well behaved even when loaded to up to 12,000 psf (575 kPa) the material is stable but has excessive 1-D strain. The LWA-FG aggregate does demonstrate the ability of load shedding (stress relaxation) due to the high frictional behavior of the material.
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Details
- Title
- Experimental assessment of the short- and long-term one-dimensional compression behavior and hydraulic properties of unbound light weight coarse aggregate
- Creators
- Robert Hill Swan Jr.
- Contributors
- Joseph Paul Martin (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xii, 162 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- Civil/Architectural/Environmental Engineering (1970-2026); College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991016558994504721