Characterization Alkali-Activated Mortar Made From Fly Ash and Sandblasting

Tajunnisa, Yuyun; Bayuaji, Ridho; Husin, Nur Ahmad; Wibowo, Boedi; Shigeishi, Mitsuhiro

doi:10.21660/2019.60.24636

Cited by 8 publications

(8 citation statements)

References 9 publications

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“…The proportions of the concrete mixtures were based on earlier research on geopolymer concrete cured at ambient temperature [10], [11], [14], [15], [18], [19]. During the investigation, the following characteristics were considered: aggregate content, alkaline activator solution, sodium silicate to NaOH ratio, the molarity of NaOH solution, and curing process.…”

Section: B Manufacture Of Geopolymer Concretementioning

confidence: 99%

Sulphate Resistance of Geopolymer Concrete Based on High Calcium Fly Ash

Tajunnisa

Husin²,

Komara³

et al. 2023

IJOE

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The inclusion of fly ash class C, which is widely available locally, can influence the progress of strength and durability qualities of geopolymer concrete when exposed to significant environmental conditions. Alternative geopolymer combinations appropriate for curing at ambient temperatures were employed to investigate the impacts of high calcium (class C) fly ash -based geopolymer concrete. A combination of sodium hydroxide and sodium silicate alkaline activator was used to react with fly ash class C. Fly ash class C was added as 20% of the total binder without using ordinary Portland cement. The durability of fly ash class C-based geopolymer concrete in sulphate environments was tested. The changes in weight, length, and compressive strength due to exposure in magnesium sulphate solution for different periods of time were determined. The test results demonstrate that fly ash class C-based geopolymer concrete cured at normal temperatures has good resistance to sulphate attack. In general, inclusion of high calcium fly ash in geopolymer concrete improved strength and performed satisfactorily in sulphate environments when cured in ambient temperature.

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Section: B Manufacture Of Geopolymer Concretementioning

confidence: 99%

Sulphate Resistance of Geopolymer Concrete Based on High Calcium Fly Ash

Tajunnisa

Husin²,

Komara³

et al. 2023

IJOE

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“…Fly ash-based geopolymer concrete offers excellent mechanical properties and durability, which is not offered by OPC concrete [4]. Researchers found geopolymer-based fly ash has good-performance concrete [28][29][30][31][32][33][34][35][36]. Concrete structures are expected to have good durability and resistance during the planned time.…”

Section: Introductionmentioning

confidence: 99%

Performance Changes in Mass and Compressive Strength of High-Calcium Fly Ash Based Geopolymer Concrete Due to Sodium Sulphate Exposure

Tajunnisa,

Husin,

Kusbiantoro

et al. 2024

IJOE

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The sulfate environment is one of the conditions that significantly affect the durability of concrete. Sulfate attack causes cracks and affects the quality of the concrete. Therefore, it is necessary to innovate concrete that can withstand the aggression of this sulfate attack. Geopolymer concrete is a breakthrough that can be developed as an alternative material without using Portland cement as the ingredients, yet by using class F fly ash as the primary source material. On the other hand, the availability of class C fly ash with high CaO content is highly abundant in Indonesia. The high calcium content in this fly ash will cause the fresh geopolymer concrete to harden rapidly. Previous studies used sucrose as an additive to overcome this rapid hardening problem. However, its effect on the geopolymer concrete exposed to sulfate ingression requires further investigation. In this study, the geopolymer concrete was produced by using class C fly ash and sucrose. The sulfate ingression was simulated by immersing the concrete specimen in the sodium sulfate solution while the mass changes and compressive strength were examined. pH measurement of the sodium sulfate solution was also carried out to provide a different perspective on the data analysis. Cylindrical specimens, measuring 10 cm x 20 cm, were produced using the dry-mixing method and the characteristic strength of 28 MPa according to SNI 2847-2019. From the results, geopolymer concrete with sucrose showed a high workability performance through the high slump value obtained. Nevertheless, the experimental results also indicated the declining strength of geopolymer concrete after the sulfate exposure. However, only a slight reduction was observed. The strength residue still satisfies the minimum requirement of SNI 2847-2019. It shows the potential of geopolymer concrete to be used as a construction material in a harsh environment with high sulfate content.

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“…Due to the high concentration of silica and alumina components, sandblasting debris possesses a binding chemical property that is stronger than cement. The high SiO 2 concentration, which ranges from 85 to 98%, is advantageous for cement mixtures [1].…”

Section: Introductionmentioning

confidence: 99%

On the Review of Utilization of Sandblasting Waste in Concrete: Cracks Propagation and Sem Results

Qomariah¹,

Rochman²

2023

cea

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These days, significant quantities of waste sand from sandblasting are being created, which in turn pollutes the environment. Utilizing sandblasting to remove accumulated biological matter and other dirt from concrete, steel, and wood components is an effective method. The purpose of the experimental laboratory is to investigate the exploitation of sandblasting waste in terms of mortar strength, concrete strength, absorption, and the mix's capacity to operate. Sand blasting produced by sand is widely available, hence the utilization of this waste as sand in concrete was investigated, using zero, 30%, and 40% substitution of normal sand and using aggregate grading in accordance with SNI-03-2834-2000. Using a 15x30 cm cylindrical test object with a treatment age of 7, 14, and 28 days ago, tests were conducted on the qualities of fresh concrete consisting of concrete viscosity values and hard concrete properties, namely specific gravity and compressive strength obtained by using waste sand. With 30% sandblasting sand replacement, specific gravity increases, corresponding to the prior test object's weight. From 7 to 14 days, specific gravity increased by 5.6%, and keep increased as 8.16% between 14 and 28 days. Specific gravity increases compared to concrete without waste sand (0% increasing) at 7 days, 4.43% at 14 days, and 10.87% at 28 days respectively, indicating that employing sandblasting waste increases cement binding. Therefore, it conforms to the compressive strength that increased by 10.09% from 14 days to 28 days. However, it decreased by 13.6% from 7 days to 14 days.

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Characterization Alkali-Activated Mortar Made From Fly Ash and Sandblasting

Cited by 8 publications

References 9 publications

Sulphate Resistance of Geopolymer Concrete Based on High Calcium Fly Ash

Sulphate Resistance of Geopolymer Concrete Based on High Calcium Fly Ash

Performance Changes in Mass and Compressive Strength of High-Calcium Fly Ash Based Geopolymer Concrete Due to Sodium Sulphate Exposure

On the Review of Utilization of Sandblasting Waste in Concrete: Cracks Propagation and Sem Results

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