Performance evaluation of fly ash and ground granulated blast furnace slag‐based geopolymer concrete: A comparative study

Yilmazoglu, Arif; Yıldırım, Şule; Behçet, Ömer Faruk; Yildiz, Sadık

doi:10.1002/suco.202100835

Cited by 10 publications

(6 citation statements)

References 62 publications

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“…The differences are the time of curing, the temperature of curing, and the difference in the activator used. Yilmazoglu et al, 57 the compressive strength of the mortars in which 100% blast furnace slag was used found a maximum of 58.34 MPa. Since the study was carried out at room temperature and the alkali/binder ratio was 0.33, it differs from the obtained values.…”

Section: Resultsmentioning

confidence: 99%

Novel binder material in geopolymer mortar production: Obsidian stone powder

Kurt

Ustabaş

Cakmak

2023

Structural Concrete

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This paper presents the results of mechanical and micro‐structural properties of geopolymer mortars with obsidian, ground granulated blast furnace slag, and metakaolin. In this study, 13 different combinations were created using 25% by weight of obsidian, blast furnace slag, and metakaolin. Geopolymer mortars were poured at 0.45 water/binder ratio, 12M NaOH concentration, and exposed to thermal cure at 75°C, 90°C, 105°C, and 120°C for 72 h. The flexural and compressive strengths of the mortars were measured and their microstructural properties were analyzed. As a result of the study, the maximum compressive strength was obtained as 93.7 MPa, and the maximum flexural strength was 21.4 MPa. From the results obtained when different combinations are used, it has been observed that the materials work in harmony with each other and the optimum curing temperature is 90°C. Also, scanning electron microscopy (SEM) and EDS analyses indicated that the compact structure of the geopolymer matrix and the Ca/Si ratio are directly proportional to the mechanical strength of the sample. The high wavelength value formed in the main band as a result of Fourier‐transformed infrared spectroscopy (FTIR) analysis shows that the mortars have high mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Novel binder material in geopolymer mortar production: Obsidian stone powder

Kurt

Ustabaş

Cakmak

2023

Structural Concrete

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“…In all these categories, fly ash and GGBS outperform PC, being produced from waste products and reducing the need for virgin materials. Furthermore, their application in concrete has demonstrated improvements in material durability and chemical attack resistance, thereby decreasing maintenance and repair needs over time [36,46,47].…”

Section: Sustainable Building Practices: Why Fly Ash and Ggbs Outperf...mentioning

confidence: 99%

Evaluation of Alkali-Activated Mortar Incorporating Combined and Uncombined Fly Ash and GGBS Enhanced with Nano Alumina

Ali

2024

Civ Eng J

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The present research focuses on assessing the fresh and hardened properties as well as the durability performance of alkali-activated mortar in an ambient environment and the impact of integrating nano-alumina (NA) at a 2% ratio as a substitute for binder materials in alkali-activated mortar (AAM). Additionally, it assesses the effectiveness of alkali-activated mortar employing different blends of ground granulated blast furnace slag (GGBS) and fly ash as environmentally friendly substitute building materials. Fly ash (FA), ground granulated blast slag (GGBS), and an equal mixture of GGBS and FA make up these binder ingredients. As a result, the main binders contain GGBS, FA, or a 50/50 mixture of GGBS and FA. The sodium hydroxide (NaOH) concentration is fixed at a 12-molarity level, and the alkali activator solution to binder ratio is kept at 0.5. In the alkali solution, the ratio of sodium silicate to sodium hydroxide is always 2.5. The study evaluates various properties of AAM, such as compressive strength, flowability, unit weight, flexural tensile strength, and durability, under ambient conditions at a steady room temperature of 23±3°C. Results indicate that AAM mixtures devoid of NA exhibit a higher flow rate compared to those containing NA. Nonetheless, the flowability of AAM mixtures aligns well with standard requirements, being modest yet adequate. Significantly, the inclusion of NA enhances the mechanical properties and durability of AAM, demonstrating its beneficial effects. Doi: 10.28991/CEJ-2024-010-03-016 Full Text: PDF

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“…Typically, the content of amorphous material in FA is between 30% and 60%, while GGBS contains more than 85% amorphous content [ 47 , 48 , 49 ]. In the XRD pattern, FA exhibits many sharp peaks, whereas GGBS exhibits a broad peak between 15° and 35° (2θ), with only a few weak sharp peaks.…”

Section: Geopolymer Materialsmentioning

confidence: 99%

Lunar Regolith Geopolymer Concrete for In-Situ Construction of Lunar Bases: A Review

Zheng,

Zhao,

Sun

et al. 2024

Polymers

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The construction of lunar bases represents a fundamental challenge for deep space exploration, lunar research, and the exploitation of lunar resources. In-situ resource utilization (ISRU) technology constitutes a pivotal tool for constructing lunar bases. Using lunar regolith to create geopolymers as construction materials offers multiple advantages as an ISRU technique. This paper discusses the principle of geopolymer for lunar regolith, focusing on the reaction principle of geopolymer. It also analyzes the applicability of geopolymer under the effects of the lunar surface environment and the differences between the highland and mare lunar regolith. This paper summarizes the characteristics of existing lunar regolith simulants and the research on the mechanical properties of lunar regolith geopolymers using lunar regolith simulants. Highland lunar regolith samples contain approximately 36% amorphous substances, the content of silicon is approximately 28%, and the ratios of Si/Al and Si/Ca are approximately 1.5 and 2.6, respectively. They are more suitable as precursor materials for geopolymers than mare samples. The compressive strength of lunar regolith geopolymer is mainly in the range of 18~30 MPa. Sodium silicate is the most commonly utilized activator for lunar regolith geopolymers; alkalinity in the range of 7% to 10% and modulus in the range of 0.8 to 2.0 are suitable. A vacuum environment and multiple temperature cycles reduce the mechanical properties of geopolymers by 8% to 70%. Future research should be concentrated on the precision control of the lunar regolith’s chemical properties and the alkali activation efficacy of geopolymers in the lunar environment.

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Performance evaluation of fly ash and ground granulated blast furnace slag‐based geopolymer concrete: A comparative study

Cited by 10 publications

References 62 publications

Novel binder material in geopolymer mortar production: Obsidian stone powder

Novel binder material in geopolymer mortar production: Obsidian stone powder

Evaluation of Alkali-Activated Mortar Incorporating Combined and Uncombined Fly Ash and GGBS Enhanced with Nano Alumina

Lunar Regolith Geopolymer Concrete for In-Situ Construction of Lunar Bases: A Review

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