Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fume
Geopolymer cold-bonded aggregate (GCBA) is a new artificial aggregate manufactured by agglomeration of aluminosilicate precursor powder hardened by alkali activation. This paper presents a multi-objective material design procedure for GCBA based on the simplex centroid design method, using metakaoli...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523002267 |
| _version_ | 1827920540771287040 |
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| author | Huan-Sheng Huang Hai-Yan Zhang Yan-Mei Lv Yao-Jia Chen |
| author_facet | Huan-Sheng Huang Hai-Yan Zhang Yan-Mei Lv Yao-Jia Chen |
| author_sort | Huan-Sheng Huang |
| collection | DOAJ |
| description | Geopolymer cold-bonded aggregate (GCBA) is a new artificial aggregate manufactured by agglomeration of aluminosilicate precursor powder hardened by alkali activation. This paper presents a multi-objective material design procedure for GCBA based on the simplex centroid design method, using metakaolin (MK), fly ash (FA), and silica fume (SF) as the ternary precursor materials. Based on the test data from 10 groups of GCBAs with designed compositions and response surface models established thereby, the optimal composition domain of the precursors was determined and experimentally validated. The effect of the precursor composition, especially the content of SF, on the performance of GCBA was evaluated. Results showed that in the optimal composition domain of the precursor (36–48 wt% of MK, 33–46 wt% of FA, and 15–24 wt% of SF), the developed GCBA achieved the given high-performance targets of bulk crushing strength higher than 21.0 MPa, the loose bulk density less than 1200 kg/m3, and water absorption less than 10%. SF content (Si/Al ratio) has a great influence on the performance of GCBA: a suitable amount of the incorporated SF (Si/Al<1.7) promoted the formation of K-A-S-H gels in GCBA, leading to an increase in strength and density, and a decrease in water absorption; while excessive SF (Si/Al>1.7) induced a self-foaming reaction, resulting in a porous microstructure and reduced strength and density. |
| first_indexed | 2024-03-13T04:12:05Z |
| format | Article |
| id | doaj.art-fccd6f5e6d7c4ae5a6baa610b6c9209d |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-13T04:12:05Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-fccd6f5e6d7c4ae5a6baa610b6c9209d2023-06-21T06:54:16ZengElsevierCase Studies in Construction Materials2214-50952023-07-0118e02047Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fumeHuan-Sheng Huang0Hai-Yan Zhang1Yan-Mei Lv2Yao-Jia Chen3State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, PR ChinaGuangdong Provincial Key Laboratory of Modern Civil Engineering Technology, South China University of Technology, Guangzhou 510641, PR China; Corresponding author.Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology, South China University of Technology, Guangzhou 510641, PR China; College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, PR ChinaKey Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, PR ChinaGeopolymer cold-bonded aggregate (GCBA) is a new artificial aggregate manufactured by agglomeration of aluminosilicate precursor powder hardened by alkali activation. This paper presents a multi-objective material design procedure for GCBA based on the simplex centroid design method, using metakaolin (MK), fly ash (FA), and silica fume (SF) as the ternary precursor materials. Based on the test data from 10 groups of GCBAs with designed compositions and response surface models established thereby, the optimal composition domain of the precursors was determined and experimentally validated. The effect of the precursor composition, especially the content of SF, on the performance of GCBA was evaluated. Results showed that in the optimal composition domain of the precursor (36–48 wt% of MK, 33–46 wt% of FA, and 15–24 wt% of SF), the developed GCBA achieved the given high-performance targets of bulk crushing strength higher than 21.0 MPa, the loose bulk density less than 1200 kg/m3, and water absorption less than 10%. SF content (Si/Al ratio) has a great influence on the performance of GCBA: a suitable amount of the incorporated SF (Si/Al<1.7) promoted the formation of K-A-S-H gels in GCBA, leading to an increase in strength and density, and a decrease in water absorption; while excessive SF (Si/Al>1.7) induced a self-foaming reaction, resulting in a porous microstructure and reduced strength and density.http://www.sciencedirect.com/science/article/pii/S2214509523002267GeopolymerCold-bonded aggregateSilica fumeHigh-strengthOptimizationSimplex centroid design |
| spellingShingle | Huan-Sheng Huang Hai-Yan Zhang Yan-Mei Lv Yao-Jia Chen Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fume Case Studies in Construction Materials Geopolymer Cold-bonded aggregate Silica fume High-strength Optimization Simplex centroid design |
| title | Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fume |
| title_full | Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fume |
| title_fullStr | Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fume |
| title_full_unstemmed | Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fume |
| title_short | Performance and optimization design of high-strength geopolymer cold-bonded lightweight aggregate: Effect of silica fume |
| title_sort | performance and optimization design of high strength geopolymer cold bonded lightweight aggregate effect of silica fume |
| topic | Geopolymer Cold-bonded aggregate Silica fume High-strength Optimization Simplex centroid design |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523002267 |
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