Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry
This experimental study investigated the use of combined industry by-products, carbide sludge (CS) and ground granulated blast-furnace slag (GGBS), to replace ordinary Portland cement (OPC) for the stabilization of clay slurry, aiming to increase the stabilization efficacy, reduce the cost, and miti...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/162070 |
| _version_ | 1811687268471013376 |
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| author | Li, Wentao Yi, Yaolin Puppala, Anand J. |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Li, Wentao Yi, Yaolin Puppala, Anand J. |
| author_sort | Li, Wentao |
| collection | NTU |
| description | This experimental study investigated the use of combined industry by-products, carbide sludge (CS) and ground granulated blast-furnace slag (GGBS), to replace ordinary Portland cement (OPC) for the stabilization of clay slurry, aiming to increase the stabilization efficacy, reduce the cost, and mitigate the environmental impacts associated with OPC production and disposal of industrial by-products. To better understand the stabilization mechanisms, properties of CS-GGBS and OPC stabilized clay slurry are systematically evaluated and compared. Test results indicate that the unconfined compressive strength (UCS) of the optimum CS-GGBS-stabilized clay slurry is 2–4 times that of the corresponding OPC-stabilized clay slurry. However, the strength of OPC paste is 1.3–1.4 times that of the optimum CS-GGBS paste. Due to the ultra-high water content and the active clay minerals, larger amounts of Ca(OH)2 are required to reach the same pH of pore water in stabilized clay slurry specimens than in the paste. This is responsible for the greater optimum CS/(CS + GGBS) ratio in the stabilized clay slurry than in the paste. OPC hydrates much faster and consumes more water than CS-GGBS during specimen preparation, resulting in a much lower void ratio and higher strength of OPC paste. For the stabilized clay slurry, the binder contents are very low and the water-to-binder ratio is hence very high, and thus the effect of binder hydration rate on the void ratio is insignificant. The remarkably different strength discrepancy between both types of stabilized clay slurry is not attributed to the slightly different void ratio, but due to the significantly different microstructures formed in the stabilized materials. The findings in this study contribute to a deep insight into the strength development of stabilized clay-slurry type dredged material. |
| first_indexed | 2024-10-01T05:13:37Z |
| format | Journal Article |
| id | ntu-10356/162070 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:13:37Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1620702022-10-03T08:39:28Z Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry Li, Wentao Yi, Yaolin Puppala, Anand J. School of Civil and Environmental Engineering Engineering::Civil engineering Carbide Sludge Ordinary Portland Cement This experimental study investigated the use of combined industry by-products, carbide sludge (CS) and ground granulated blast-furnace slag (GGBS), to replace ordinary Portland cement (OPC) for the stabilization of clay slurry, aiming to increase the stabilization efficacy, reduce the cost, and mitigate the environmental impacts associated with OPC production and disposal of industrial by-products. To better understand the stabilization mechanisms, properties of CS-GGBS and OPC stabilized clay slurry are systematically evaluated and compared. Test results indicate that the unconfined compressive strength (UCS) of the optimum CS-GGBS-stabilized clay slurry is 2–4 times that of the corresponding OPC-stabilized clay slurry. However, the strength of OPC paste is 1.3–1.4 times that of the optimum CS-GGBS paste. Due to the ultra-high water content and the active clay minerals, larger amounts of Ca(OH)2 are required to reach the same pH of pore water in stabilized clay slurry specimens than in the paste. This is responsible for the greater optimum CS/(CS + GGBS) ratio in the stabilized clay slurry than in the paste. OPC hydrates much faster and consumes more water than CS-GGBS during specimen preparation, resulting in a much lower void ratio and higher strength of OPC paste. For the stabilized clay slurry, the binder contents are very low and the water-to-binder ratio is hence very high, and thus the effect of binder hydration rate on the void ratio is insignificant. The remarkably different strength discrepancy between both types of stabilized clay slurry is not attributed to the slightly different void ratio, but due to the significantly different microstructures formed in the stabilized materials. The findings in this study contribute to a deep insight into the strength development of stabilized clay-slurry type dredged material. Ministry of Education (MOE) The financial support from Singapore MOE AcRF Tier 1 grant (RG184/17) is appreciated. 2022-10-03T08:39:27Z 2022-10-03T08:39:27Z 2022 Journal Article Li, W., Yi, Y. & Puppala, A. J. (2022). Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry. Construction and Building Materials, 321, 126382-. https://dx.doi.org/10.1016/j.conbuildmat.2022.126382 0950-0618 https://hdl.handle.net/10356/162070 10.1016/j.conbuildmat.2022.126382 2-s2.0-85122654210 321 126382 en RG184/17 Construction and Building Materials © 2022 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Carbide Sludge Ordinary Portland Cement Li, Wentao Yi, Yaolin Puppala, Anand J. Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry |
| title | Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry |
| title_full | Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry |
| title_fullStr | Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry |
| title_full_unstemmed | Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry |
| title_short | Comparing carbide sludge-ground granulated blastfurnace slag and ordinary Portland cement: different findings from binder paste and stabilized clay slurry |
| title_sort | comparing carbide sludge ground granulated blastfurnace slag and ordinary portland cement different findings from binder paste and stabilized clay slurry |
| topic | Engineering::Civil engineering Carbide Sludge Ordinary Portland Cement |
| url | https://hdl.handle.net/10356/162070 |
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