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Seawater sea-sand Engineered Geopolymer Composites (EGC) with high strength and high ductility
https://orcid.org/0000-0001-7421-9847
https://orcid.org/0000-0002-9237-504X
https://orcid.org/0000-0001-9904-7914
Abstract In this study, seawater sea-sand Engineered Geopolymer Composites (SS-EGC) were developed and investigated for the first time. The developed EGC achieved high compressive strength (over 140 MPa) and high tensile ductility (around 8%) simultaneously. Emphasis was placed on understanding the influence of seawater and sea-sand (compared to freshwater and washed sea-sand) on the matrix properties and tensile performance of EGC, with two fly ash-to-slag ratios (8:2 and 2:8) considered in the matrices. Results showed that the use of seawater hindered the reaction of EGC matrix and led to a slight reduction of compressive strength (compared to the freshwater counterpart). It was found that the content of hydrotalcite phases in SS-EGC matrix was higher than that of freshwater EGC. In addition, using seawater was found to increase the average modulus of matrix obtained from nanoindentation, leading to a higher fiber/matrix bond strength. The tensile strain capacity of SS-EGC was slightly lower than that of freshwater EGC. The developed SS-EGC showed superior crack resistance and better sustainability than the cement-based counterpart from the literature (with similar compressive strength). The findings of this study provided useful knowledge for the design and development of high-strength high-ductility SS-EGC towards sustainable and resilient marine infrastructures.
Highlights Seawater Sea-sand EGC (SS-EGC) were developed and investigated for the first time. Using seawater and sea-sand slightly decreased the compressive strength of EGC. The content of hydrotalcite phases in SS-EGC matrix was higher than that of freshwater EGC. Using seawater and sea-sand in EGC increased the tensile strength but lowered the tensile strain capacity. The developed SS-EGC showed better sustainability and lower cost than the cement-based counterpart in the literature.
Seawater sea-sand Engineered Geopolymer Composites (EGC) with high strength and high ductility
https://orcid.org/0000-0001-7421-9847
https://orcid.org/0000-0002-9237-504X
https://orcid.org/0000-0001-9904-7914
Abstract In this study, seawater sea-sand Engineered Geopolymer Composites (SS-EGC) were developed and investigated for the first time. The developed EGC achieved high compressive strength (over 140 MPa) and high tensile ductility (around 8%) simultaneously. Emphasis was placed on understanding the influence of seawater and sea-sand (compared to freshwater and washed sea-sand) on the matrix properties and tensile performance of EGC, with two fly ash-to-slag ratios (8:2 and 2:8) considered in the matrices. Results showed that the use of seawater hindered the reaction of EGC matrix and led to a slight reduction of compressive strength (compared to the freshwater counterpart). It was found that the content of hydrotalcite phases in SS-EGC matrix was higher than that of freshwater EGC. In addition, using seawater was found to increase the average modulus of matrix obtained from nanoindentation, leading to a higher fiber/matrix bond strength. The tensile strain capacity of SS-EGC was slightly lower than that of freshwater EGC. The developed SS-EGC showed superior crack resistance and better sustainability than the cement-based counterpart from the literature (with similar compressive strength). The findings of this study provided useful knowledge for the design and development of high-strength high-ductility SS-EGC towards sustainable and resilient marine infrastructures.
Highlights Seawater Sea-sand EGC (SS-EGC) were developed and investigated for the first time. Using seawater and sea-sand slightly decreased the compressive strength of EGC. The content of hydrotalcite phases in SS-EGC matrix was higher than that of freshwater EGC. Using seawater and sea-sand in EGC increased the tensile strength but lowered the tensile strain capacity. The developed SS-EGC showed better sustainability and lower cost than the cement-based counterpart in the literature.
Seawater sea-sand Engineered Geopolymer Composites (EGC) with high strength and high ductility
https://orcid.org/0000-0001-7421-9847
https://orcid.org/0000-0002-9237-504X
https://orcid.org/0000-0001-9904-7914
Abstract In this study, seawater sea-sand Engineered Geopolymer Composites (SS-EGC) were developed and investigated for the first time. The developed EGC achieved high compressive strength (over 140 MPa) and high tensile ductility (around 8%) simultaneously. Emphasis was placed on understanding the influence of seawater and sea-sand (compared to freshwater and washed sea-sand) on the matrix properties and tensile performance of EGC, with two fly ash-to-slag ratios (8:2 and 2:8) considered in the matrices. Results showed that the use of seawater hindered the reaction of EGC matrix and led to a slight reduction of compressive strength (compared to the freshwater counterpart). It was found that the content of hydrotalcite phases in SS-EGC matrix was higher than that of freshwater EGC. In addition, using seawater was found to increase the average modulus of matrix obtained from nanoindentation, leading to a higher fiber/matrix bond strength. The tensile strain capacity of SS-EGC was slightly lower than that of freshwater EGC. The developed SS-EGC showed superior crack resistance and better sustainability than the cement-based counterpart from the literature (with similar compressive strength). The findings of this study provided useful knowledge for the design and development of high-strength high-ductility SS-EGC towards sustainable and resilient marine infrastructures.
Highlights Seawater Sea-sand EGC (SS-EGC) were developed and investigated for the first time. Using seawater and sea-sand slightly decreased the compressive strength of EGC. The content of hydrotalcite phases in SS-EGC matrix was higher than that of freshwater EGC. Using seawater and sea-sand in EGC increased the tensile strength but lowered the tensile strain capacity. The developed SS-EGC showed better sustainability and lower cost than the cement-based counterpart in the literature.
Seawater sea-sand Engineered Geopolymer Composites (EGC) with high strength and high ductility
Lao, Jian-Cong (author) / Huang, Bo-Tao (author) / Xu, Ling-Yu (author) / Khan, Mehran (author) / Fang, Yi (author) / Dai, Jian-Guo (author)
2023-02-20
Article (Journal)
Electronic Resource
English
Engineered Geopolymer Composites (EGC) , Engineered Cementitious Composites (ECC) , Strain-Hardening Geopolymer Composites (SHGC) , Strain-Hardening Cementitious Composites (SHCC) , Ultra-High-Performance Geopolymer Concrete (UHPGC) , Ultra-High-Performance Concrete (UHPC) , Alkali-activated materials , Seawater , Sea-sand , Low carbon
Engineered Geopolymer Composites (EGC) with Ultra-high Strength and Ductility
| Springer Verlag | 2023