Thesis
CHARACTERIZATION OF RECYCLED CFRP FOR ELECTRICALLY CONDUCTIVE CONCRETE WITH SELF-DEICING ABILITY AND ADDED STRENGTH
Washington State University
Master of Science (MS), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000003101
Handle:
https://hdl.handle.net/2376/125044
Abstract
Salt, sand, and chemical deicers for winter road maintenance are expensive and harmful to natural and built environments. Therefore, electrically conductive concrete (ECC) has been studied for self-deicing pavements to alleviate traditional winter maintenance operations. However, virgin carbon fibers and nanotubes used in ECC are high-priced and energy-intensive. Therefore, this study evaluates mechanically recycled carbon fiber reinforced polymer (rCFRP) as an eco-friendly and potentially lower cost conductive additive for ECC. Industrial by-product CFRP from the manufacturing industry was first mechanically reduced into macro-sized reinforcement. A non-destructive microwave test method was improvised to measure the dielectric properties of small rCFRP-cement paste slabs. Average 28-day dielectric constants were 29, 53, 83, and 70 for 3%, 5%, 7%, and 10%Vol rCFRP compared to 13 of the plain paste. The percolation limit was found to be between 7-10%Vol rCFRP. Next, rCFRP-concretes were produced with 1.5%, 3%, 5%, and 7%Vol rCFRP as replacement of sand. From each mixture, beams were cast with two embedded copper electrodes for self-heating under passed electric current. When tested in an ambient temperature of -15°C covered with 6.35mm of ice shavings, representing harsh winter conditions, the 5%Vol and 7%Vol rCFRP-concretes proved successful in melting all the ice within 240 and 140 minutes with 1,127 W/m2 and 1,958 W/m2 power consumption. Meanwhile, rCFRP-concrete were also evaluated for mechanical properties. Tensile strength on 28-day increased remarkably by 46% with 3% rCFRP and 20% with 5% rCFRP. Flexural strength on 28-day also significantly improved by 19% with 5%Vol rCFRP. Absorbed fracture energy computed based on the area under the flexural load-deflection graphs increased by 2.8 times with 5%Vol rCFRP.
Therefore, 5%Vol rCFRP-concrete had the best performance among all tested rCFRP loadings based on multicriteria of energy and cost-efficiency and enhanced mechanical properties. The subsequent phases of the study should include life-cycle analysis, techno-economic analysis, and field implementation to move towards mainstream implementation of self-deicing pavements.
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Details
- Title
- CHARACTERIZATION OF RECYCLED CFRP FOR ELECTRICALLY CONDUCTIVE CONCRETE WITH SELF-DEICING ABILITY AND ADDED STRENGTH
- Creators
- Abdullah Al Moman
- Contributors
- Somayeh Nassiri (Advisor)Karl Englund (Committee Member)Hui Li (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Voiland College of Engineering and Architecture
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 138
- Identifiers
- 99900651792501842
- Language
- English
- Resource Type
- Thesis