Thesis
EVALUATION OF RECYCLED POWDERS AND PELLETS FROM BRICK, CONCRETE, GLASS, AND CARPET WASTE TO REPLACE CEMENT AND FINE AGGREGATE IN CONCRETE
Washington State University
Master of Science (MS), Washington State University
01/2022
DOI:
https://doi.org/10.7273/000004484
Handle:
https://hdl.handle.net/2376/125095
Abstract
The wide use of concrete in the world is the main building block of infrastructure construction and residential structures (OAR US EPA 2016). Global cement production has reached 4.1 Gigaton (GT) in 2019 and the CO2 intensity has increased by 0.5% per year from 2014 to 2018 (IEA 2020). One approach is finding supplementary cementitious materials (SCMs) to replace a portion of the cement in concrete, thus, lowering cement use and reducing the negative impacts of cement production on the environment. The first study evaluates recycled brick powder (RBP) and recycled concrete powder (RCP) as a 20% replacement by weight of ordinary Portland cement (OPC). The RBP and RCP mortars and concrete met the minimum SAI of 75% of the 100wt%-OPC control at 7 and 28 days. RBP in concrete increased compressive strength (f’c) by 5% by 56 days along with improved durability by 24%. By 56-day, the RCP produced no statistical change in f’c.
The second study evaluates recycled glass powders (RGPs) ball milled by two methods (steel balls (SB) and ceramic balls (SB)) as a 20% replacement by weight of OPC. The RGP (SB) and RGP (CB) also met the SAI index of 75% for 7 and 28 days in concrete. The RGPs in concrete increased the f’c by 19% for RGP(SB) and 5% for RGP(CB) by 56 days. The addition RGPs also increased the durability of concrete by 150% RGP(CB) and 130% for RGP(SB) based on surface resistivity.
The last study utilizes waste carpet fiber made into pellets to replace fine aggregate in concrete at 10% and 20% by volume. The 28day f’c of cylinders was 23% and 28% lower than the CTRL, and the 28day flexural strength of beams was reduced by 14% and 17% for CP10% and CP20%. The flexural strength for CP10% showed no statistical difference. The ductility increased compared to the CTRL with CP10% at 7 (0.9mm) and 28 (0.8mm) days.
This study's findings are encouraging and could lead to the development of recycling and reuse paths for these difficult to recycle consumer and construction & demolition waste materials.
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Details
- Title
- EVALUATION OF RECYCLED POWDERS AND PELLETS FROM BRICK, CONCRETE, GLASS, AND CARPET WASTE TO REPLACE CEMENT AND FINE AGGREGATE IN CONCRETE
- Creators
- lauren likes
- Contributors
- Somayeh Nassiri (Advisor)Karl Englund (Committee Member)Xianming Shi (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 181
- Identifiers
- 99900882138801842
- Language
- English
- Resource Type
- Thesis