Development of Sucrose and Citric Acid as the Natural based Admixture for Fly Ash based Geopolymer

Kusbiantoro, Andri; Ibrahim, Mohd Sobri; Muthusamy, Khairunisa; Alias, Asmidar

doi:10.1016/j.proenv.2013.02.075

Cited by 69 publications

(23 citation statements)

References 8 publications

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“…Previous studies have investigated the efficiency of RTs in conventional ‘two-part’ geopolymer mixtures. For instance, Kusbiantoro et al [44] studied the effect of sucrose and citric acid on fly ash-based geopolymers. They reported that sucrose had retarding effect, while citric acid exhibited accelerating effect.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators

2019

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Currently, there are a very limited number of studies on the effect of admixtures on properties of ‘one-part’ geopolymers. This paper reports the effects of different superplasticizers and retarders on fresh and hardened properties of one-part fly ash-slag blended geopolymers made by different solid activators. Two different grades of sodium silicate, namely anhydrous sodium metasilicate powder (nSiO2/nNa2O = 0.9) and GD Grade sodium silicate powder (nSiO2/nNa2O = 2.0) were used as the solid activators. Five different commercially available superplasticizers, including three modified polycarboxylate-based superplasticizers (denoted as PC1, PC2, and PC3) and two naphthalene-based superplasticizers (denoted as N1 and N2), as well as three different retarders, including sucrose, anhydrous borax and a commercially available retarder, were investigated. Workability, setting time and compressive strength of the mixtures without and with addition of each ‘individual’ admixture were measured. The results showed the effect of admixtures on the properties of the one-part geopolymers significantly depended on the type of solid activator and the type of admixture used. When GD Grade sodium silicate powder was used as the solid activator, all investigated admixtures not only had no positive effect on the workability and setting time, but also significantly reduced the compressive strength of the mixture. However, when anhydrous sodium metasilicate powder was used as the solid activator, the PC1 and sucrose were the best performing superplasticizer and retarder, respectively, causing no reduction in the compressive strength, but significant increase in the workability (up to + 72%) and setting time (up to + 111%), respectively as compared to the mixture with no admixture. In addition, the results also showed that addition of ‘combined’ admixtures (i.e., PC1 in the presence of sucrose) significantly increased the workability (up to + 39%) and setting time (up to + 141%), but slightly reduced the compressive strength (−16%) of the mixture activated by anhydrous sodium metasilicate powder, as compared to the mixture with no admixture.

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Section: Introductionmentioning

confidence: 99%

Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators

2019

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“…However, it may cause a decrease in the concrete's compressive strength (Boonserm et al 2012). The application of sucrose as a retarder in the geopolymer is one of the possibilities; however, there is a strength reduction tendency with added sucrose (Assi et al 2018;Kusbiantoro et al 2013). Other efforts to prolong the setting time of high calcium fly ash geopolymer have been done previously with less success Topark-Ngarm et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Fresh and Hardened Properties of High Calcium Fly Ash-Based Geopolymer Matrix with High Dosage of Borax

Antoni

Purwantoro

Suyanto

et al. 2019

Iran J Sci Technol Trans Civ Eng

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Your article is protected by copyright and all rights are held exclusively by Shiraz University. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com". AbstractGeopolymer is synthesized by mixing material rich in alumina and silica, such as fly ash, with a highly alkaline solution to form a hardened matrix. However, when using high calcium fly ash as a precursor, a flash set frequently occurs, i.e., the mixture hardens very rapidly before casting can be completed. The use of borax as an additive has been reported due to its potential to prolong the setting time. In this study, the use of a significantly higher dosage of borax is explored. The results show that the addition of borax up to 20% of fly ash, by mass, into the alkaline solution prolongs the setting time by up to 90 min. Conversely, the addition of higher amounts of borax tends to decrease the compressive strength of the geopolymer, whereas adding a small amount of calcium oxide into the mixture increases the strength marginally, especially when the borax content is small. However, the amount of calcium oxide should be limited because at higher content, the effectiveness of borax to prolong the setting time is reduced.

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“…The use of additive to prolong the setting time and to increase the workability of geopolymer mixture has been suggested by several authors. Naphthalene based superplasticizer [4], dipotassium phosphate [11] and sucrose [13] have been mixed in the geopolymer mixture to slow down the Borax as retarding additive was not well known to be used in Portland cement or geopolymer, but several researchers have mentioned that it could be used to retard the setting time of concrete [1,9]. Using 100% high calcium fly ash as cement paste, Cross et al [1] encountered flash setting.…”

Section: Introductionmentioning

confidence: 99%

The Use of Borax in Deterring Flash Setting of High Calcium Fly Ash Based Geopolymer

Antoni

Wijaya

Satria

et al. 2016

MSF

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Geopolymer that was made with high CaO content fly ash was found to have higher compressive strength than the low CaO fly ash, using the same mixture composition. This effect could be due to the physico-chemical properties of the fly ash, in respect to its particle size or the chemical composition. Although it was not widely published, the occurrence of flash setting of geopolymer was known to occur when using high CaO content fly ash as the precursor. Geopolymer paste may solidify within minutes after the addition of alkali activators, making it very difficult to cast in big volume. This paper investigate the effect of borax addition to the high calcium fly ash-based geopolymer mixture to reduce the occurrence of flash setting. It was found that the setting time can be extended significantly, with the addition of 5% borax, by mass, of fly ash. The addition of borax also have positive effect on increasing the compressive strength of geopolymer.

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Development of Sucrose and Citric Acid as the Natural based Admixture for Fly Ash based Geopolymer

Cited by 69 publications

References 8 publications

Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators

Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators

Fresh and Hardened Properties of High Calcium Fly Ash-Based Geopolymer Matrix with High Dosage of Borax

The Use of Borax in Deterring Flash Setting of High Calcium Fly Ash Based Geopolymer

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