Compressive Strength of Geopolymer Based on the Fly Ash Variation

Antoni, Antoni; Wijaya, Stephen Wibiatma; Hardjito, Djwantoro

doi:10.4028/www.scientific.net/msf.841.98

Cited by 16 publications

(14 citation statements)

References 6 publications

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“…Research conducted by Antoni revealed that pH value of fly ash influence the setting time of geopolymer paste [11]. The pH value was tested by dissolving fly ash into distilled water followed with pH measurement.…”

Section: Ph Testmentioning

confidence: 99%

See 1 more Smart Citation

Chemical and Physical Characterization of Fly Ash as Geopolymer Material

2017

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Abstract.Research on finding suitable cement substitute material becomes massive due to environmental effect. Geopolymer as inorganic material is potential to be the smart solution to overcome global warming issue. Fly ash is a waste material rich in silica and alumina becomes popular raw material to produce geopolymer. The best properties ofgeopolymer paste come from the high quality of fly ash. Therefore, it is important to investigate various types of fly ash and geopolymer properties. Their chemical and physical properties characterized by XRF, pH value, XRD and SEM. The results showed that type of fly ash depended on amount of Si-based of Ca-based compound which consisted of spherical morphology. Geopolymer paste produced from the ash with different compound has bulky and irregular shape morphology. The pH value of each ash has also a correlation with the setting time of fresh paste.

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Section: Ph Testmentioning

confidence: 99%

“…Research conducted by Antoni stated that degree of acid or pH from fly ash plays an important role in setting time of geopolymer paste. Higher pH level of fly ash induces faster setting time of geopolymer paste [10,11]. XRD test was performed in order to discover crystalline mineral component of fly ash [12].…”

Section: Introductionmentioning

confidence: 99%

Chemical and Physical Characterization of Fly Ash as Geopolymer Material

2017

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“…Fly ash samples for making geopolymer were obtained from a power plant located in Paiton, East Java, Indonesia. It was reported as a good precursor for making good geopolymer [10]. A combination of chemical grade sodium hydroxide (NaOH) and sodium silicate solution was used as the alkaline activator.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The authors' previous studies [9,10] have found that fly ash obtained from different power plants in Java island, Indonesia, produced different properties of the resulting geopolymer mortar. Setting time and compressive strength are affected by the physical and chemical properties of the fly ash used.…”

Section: Introductionmentioning

confidence: 99%

Effect of Variability of Fly Ash Obtained from the Same Source on the Characteristics of Geopolymer

2017

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Abstract. Geopolymer properties is notably influenced by the quality of fly ash used as the precursor material. Fly ash obtained from the same source may have varying physical and chemical characteristics. The characteristics are influenced by, among other, the method and temperature of burning, the degree of grinding and the quarry sources of the coal. In this study, high calcium fly ash from a single power plant was investigated, to analyze the effect of its variability on the characteristics of geopolymer mortar. Fly ash samples were collected at ten different sampling periods. Three mixture compositions, with different sodium silicate solution to sodium hydroxide ratios, were prepared to produce geopolymer mortars. From the results, it was found that there are broad variation of fly ash chemical properties, however only small variation on the fineness and LOI was discovered. The setting time and compressive strength of geopolymer are influenced by the fly ash particle size, pH value and chemical content. Higher level of calcium oxide content increases the compressive strength, while finer particle size could have effect on the later age increase of the compressive strength. Faster setting time is also correlated with the higher pH value of the fly ash, with the tendency of flash setting occurrence for geopolymer using fly ash of high pH level.

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“…Additionally CaO content in the mixture also affect the value of setting time. Fly ash has higher a CaO content compared to metakaolin so that a mixture that containing a lot of metakaolin will have fewer CaO content that deliver long setting time [13].…”

Section: Compressive Strengthmentioning

confidence: 99%

Mechanical and physical properties of metakaolin based geopolymer paste

et al. 2017

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Abstract. This paper presents the result of studies on utilizing metakaolin obtained from Belitung as fly ash substitute material to produce geopolymer paste. Mechanical properties were assessed by compressive strength while physical properties were assessed by setting time, porosity, microstructure test and density test. The experiment was performed on geopolymer paste with 0, 25%, 50%, 75% and 100% fly ash replacement with metakaolin. Sodium Hidroxide (NaOH) with concentration of 10 Molars and Sodium Silicate (Na2SiO3) were used as alkaline activator. In addition, activator ratio between sodium silicate to sodium hidroxide of 2 was applied. The result obtains that increasing metakaolin contain in mixture deliver longer setting time, higher open pore number, lower density and lower compressive strength of geopolymer paste. However, adding metakaolin up to 25 % into geopolymer paste mixture could increase mechanical and physical properties of geopolymer paste.

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Compressive Strength of Geopolymer Based on the Fly Ash Variation

Cited by 16 publications

References 6 publications

Chemical and Physical Characterization of Fly Ash as Geopolymer Material

Chemical and Physical Characterization of Fly Ash as Geopolymer Material

Effect of Variability of Fly Ash Obtained from the Same Source on the Characteristics of Geopolymer

Mechanical and physical properties of metakaolin based geopolymer paste

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