Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Concrete made with high-strength artificial geopolymer aggregates: Mechanical properties and failure mechanisms
https://orcid.org/0000-0002-6931-2630
https://orcid.org/0000-0002-9237-504X
https://orcid.org/0000-0002-8663-1369
https://orcid.org/0000-0001-9904-7914
Highlights Artificial geopolymer aggregates (GPA) with high strength were produced and utilized. Geopolymer aggregate concrete (GAC) exhibited higher compressive and splitting tensile strengths than natural aggregate concrete (NAC) given the same water-to-binder ratio. Different from NAC, GAC had no weak interfacial transition zone. The high-strength GPA exhibited higher cost efficiency than the normal-strength GPA reported in existing literature.
Abstract Artificial geopolymer aggregates (GPA) provide an effective solution to simultaneously reduce the over-excavation of natural rock and mitigate the waste landfills. In this study, GPA with a paste compressive strength over 140 MPa were produced and used as coarse aggregates in concrete with different water-to-binder ratios (w/b = 0.3, 0.4, and 0.5). The mechanical properties and failure mechanisms of so-formed geopolymer aggregate concrete (GAC) were comprehensively investigated and compared with those of natural aggregate concrete (NAC). Although GPA showed inferior strength than natural aggregates, both the compressive and splitting tensile strengths of GAC were 8.0 % and 5.5 % higher than those of NAC, respectively, when w/b = 0.3. For the failure modes of GAC, cracks penetrated through both GPA and matrix when w/b = 0.3, while more aggregate/matrix interfacial cracks were observed as w/b increased. In comparison, major cracks propagated along the aggregate/matrix interface in NAC. From microhardness tests, the comparatively weak interfacial transition zone (ITZ) was observed in NAC, rather than in GAC. The micro-level observations demonstrated the existence of dense microstructures in GPA/matrix interfacial regions, especially when w/b is low. The findings provided a fundamental understanding of the mechanical properties and failure mechanisms of GAC, which is helpful for the future applications of GPA.
Concrete made with high-strength artificial geopolymer aggregates: Mechanical properties and failure mechanisms
https://orcid.org/0000-0002-6931-2630
https://orcid.org/0000-0002-9237-504X
https://orcid.org/0000-0002-8663-1369
https://orcid.org/0000-0001-9904-7914
Highlights Artificial geopolymer aggregates (GPA) with high strength were produced and utilized. Geopolymer aggregate concrete (GAC) exhibited higher compressive and splitting tensile strengths than natural aggregate concrete (NAC) given the same water-to-binder ratio. Different from NAC, GAC had no weak interfacial transition zone. The high-strength GPA exhibited higher cost efficiency than the normal-strength GPA reported in existing literature.
Abstract Artificial geopolymer aggregates (GPA) provide an effective solution to simultaneously reduce the over-excavation of natural rock and mitigate the waste landfills. In this study, GPA with a paste compressive strength over 140 MPa were produced and used as coarse aggregates in concrete with different water-to-binder ratios (w/b = 0.3, 0.4, and 0.5). The mechanical properties and failure mechanisms of so-formed geopolymer aggregate concrete (GAC) were comprehensively investigated and compared with those of natural aggregate concrete (NAC). Although GPA showed inferior strength than natural aggregates, both the compressive and splitting tensile strengths of GAC were 8.0 % and 5.5 % higher than those of NAC, respectively, when w/b = 0.3. For the failure modes of GAC, cracks penetrated through both GPA and matrix when w/b = 0.3, while more aggregate/matrix interfacial cracks were observed as w/b increased. In comparison, major cracks propagated along the aggregate/matrix interface in NAC. From microhardness tests, the comparatively weak interfacial transition zone (ITZ) was observed in NAC, rather than in GAC. The micro-level observations demonstrated the existence of dense microstructures in GPA/matrix interfacial regions, especially when w/b is low. The findings provided a fundamental understanding of the mechanical properties and failure mechanisms of GAC, which is helpful for the future applications of GPA.
Concrete made with high-strength artificial geopolymer aggregates: Mechanical properties and failure mechanisms
https://orcid.org/0000-0002-6931-2630
https://orcid.org/0000-0002-9237-504X
https://orcid.org/0000-0002-8663-1369
https://orcid.org/0000-0001-9904-7914
Highlights Artificial geopolymer aggregates (GPA) with high strength were produced and utilized. Geopolymer aggregate concrete (GAC) exhibited higher compressive and splitting tensile strengths than natural aggregate concrete (NAC) given the same water-to-binder ratio. Different from NAC, GAC had no weak interfacial transition zone. The high-strength GPA exhibited higher cost efficiency than the normal-strength GPA reported in existing literature.
Abstract Artificial geopolymer aggregates (GPA) provide an effective solution to simultaneously reduce the over-excavation of natural rock and mitigate the waste landfills. In this study, GPA with a paste compressive strength over 140 MPa were produced and used as coarse aggregates in concrete with different water-to-binder ratios (w/b = 0.3, 0.4, and 0.5). The mechanical properties and failure mechanisms of so-formed geopolymer aggregate concrete (GAC) were comprehensively investigated and compared with those of natural aggregate concrete (NAC). Although GPA showed inferior strength than natural aggregates, both the compressive and splitting tensile strengths of GAC were 8.0 % and 5.5 % higher than those of NAC, respectively, when w/b = 0.3. For the failure modes of GAC, cracks penetrated through both GPA and matrix when w/b = 0.3, while more aggregate/matrix interfacial cracks were observed as w/b increased. In comparison, major cracks propagated along the aggregate/matrix interface in NAC. From microhardness tests, the comparatively weak interfacial transition zone (ITZ) was observed in NAC, rather than in GAC. The micro-level observations demonstrated the existence of dense microstructures in GPA/matrix interfacial regions, especially when w/b is low. The findings provided a fundamental understanding of the mechanical properties and failure mechanisms of GAC, which is helpful for the future applications of GPA.
Concrete made with high-strength artificial geopolymer aggregates: Mechanical properties and failure mechanisms
Qian, Lan-Ping (Autor:in) / Huang, Bo-Tao (Autor:in) / Xu, Ling-Yu (Autor:in) / Dai, Jian-Guo (Autor:in)
04.01.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Strength Properties of Geopolymer Concrete Modified with Recycled Aggregates
| Springer Verlag | 2022
| Emerald Group Publishing | 2022