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A review of engineering properties of ultra-high-performance geopolymer concrete
As yet, no article has comprehensively examined the mechanical properties, durability, and microstructure of ultra-high-performance geopolymer concrete (UHPGC) in comparison with ultra-high-performance concrete (UHPC). In addition, no review article has scrutinized the mechanical properties and microstructure of UHPGC exposed to high temperatures. Therefore, this article has undertaken a review of these aspects of UHPGC by examining the fresh properties, hardened properties, microstructure, durability, and specifications of UHPGC exposed to high temperatures. To evaluate the mechanical properties of UHPGC, the tests for flexural strength, compressive strength, modulus of elasticity, and tensile strength that have been performed by researchers thus far have been reviewed. In addition, Fourier-transform infrared spectroscopy (FTIR), energy-dispersive x-ray spectroscopy (EDS), scanning electron microscopy (SEM), and mercury intrusion measurement tests were studied to evaluate the microstructure characteristics of UHPGC. Finally, to evaluate the durability characteristics of UHPGC, the results of rapid chloride penetration, electrical resistivity, and rapid chloride migration tests were compared. The results showed that UHPGC can meet the ideal specifications of UHPC in terms of its mechanical properties. Moreover, the UHPC microstructure is denser than UHPGC. A stronger ion passing was seen in UHPGC because pores larger than 100 nm were found, whereas pores of UHPC were only about 10 nm. It is concluded that the optimal percentage of silica fume as a slag substitute to create the highest compressive strength, tensile strength, and modulus of elasticity in UHPGC was 30, 30, and 20%, respectively. In addition, the best combination of activators to create the best mechanical characteristics and microstructure of UHPGC at temperatures above 600 °C was potassium hydroxide/sodium silicate.
A review of engineering properties of ultra-high-performance geopolymer concrete
As yet, no article has comprehensively examined the mechanical properties, durability, and microstructure of ultra-high-performance geopolymer concrete (UHPGC) in comparison with ultra-high-performance concrete (UHPC). In addition, no review article has scrutinized the mechanical properties and microstructure of UHPGC exposed to high temperatures. Therefore, this article has undertaken a review of these aspects of UHPGC by examining the fresh properties, hardened properties, microstructure, durability, and specifications of UHPGC exposed to high temperatures. To evaluate the mechanical properties of UHPGC, the tests for flexural strength, compressive strength, modulus of elasticity, and tensile strength that have been performed by researchers thus far have been reviewed. In addition, Fourier-transform infrared spectroscopy (FTIR), energy-dispersive x-ray spectroscopy (EDS), scanning electron microscopy (SEM), and mercury intrusion measurement tests were studied to evaluate the microstructure characteristics of UHPGC. Finally, to evaluate the durability characteristics of UHPGC, the results of rapid chloride penetration, electrical resistivity, and rapid chloride migration tests were compared. The results showed that UHPGC can meet the ideal specifications of UHPC in terms of its mechanical properties. Moreover, the UHPC microstructure is denser than UHPGC. A stronger ion passing was seen in UHPGC because pores larger than 100 nm were found, whereas pores of UHPC were only about 10 nm. It is concluded that the optimal percentage of silica fume as a slag substitute to create the highest compressive strength, tensile strength, and modulus of elasticity in UHPGC was 30, 30, and 20%, respectively. In addition, the best combination of activators to create the best mechanical characteristics and microstructure of UHPGC at temperatures above 600 °C was potassium hydroxide/sodium silicate.
A review of engineering properties of ultra-high-performance geopolymer concrete
Hadi Bahmani (author) / Davood Mostofinejad (author)
2023
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
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