Effect of Alkaline Activator Ratio to Mechanical Properties of Geopolymer Concrete with Trass as Filler

Risdanareni, Puput; Ekaputri, Januarti Jaya; Abdullah, Mohd Mustafa Al Bakri

doi:10.4028/www.scientific.net/amm.754-755.406

Cited by 21 publications

(21 citation statements)

References 8 publications

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“…So it can be concluded that the number of open pore is inversely proportional to the compressive strength and density of geopolymer paste. This is consistent with previous studies which stated that increasing the number of open pore will decrease the compressive strength and density of geopolymer paste [14]. Fernadez was also stated that particle size and particle distance play an important role in developing properties of geopolymer binder.…”

Section: Porositysupporting

confidence: 81%

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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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Section: Porositysupporting

confidence: 81%

“…Open pore is a pore that is permeable so that it can be penetrated by water and air, while the close pore is impermeable so that water and air cannot pass [14].…”

Section: Porositymentioning

confidence: 99%

Mechanical and physical properties of metakaolin based geopolymer paste

et al. 2017

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“…In geopolymer concrete, this fly ash will replace the cement as binder. However, compared to the cement concrete, geopolymer concrete has lower workability [5] due to the sort setting time of geopolymer concrete. Geopolymer concrete prone to harden before delivered to the construction site located far away from the batching plant.…”

Section: Introductionmentioning

confidence: 99%

Workability enhancement of geopolymer concrete through the use of retarder

Umniati

Risdanareni

Zein

2017

AIP Conference Proceedings

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Abstract. Geopolymer concrete is a type of concrete manufactured without the addition of cement. In geopolymer concrete, along with an activator, cement as the concrete binder can be replaced by the fly ash. This will reduce global demand on cement, and therefore will reduce CO2 emission due to cement production. Thus, geopolymer concrete is commonly known as an eco-friendly concrete. Geopolymer concrete also offers a solution concerning with the utilization of the fly ash waste. However, despite of its environmental advantages, geopolymer concrete has a drawback, namelygeopolymer concrete set quickly, thus reducing its workability. This research aimed to increase the workability of geopolymer concrete by using retarder admixture (Plastocrete RT6 Plus). Retarder used varies within 0.2%, 0.4% and 0.6% of fly ash mass. As a control, geopolymer concrete without retarder (0%) were also made. Activator used in this research was Na2SiO3 mixed with NaOH 10 M solution, with ratio of 1:5. The results showed an optimum composition of geopolymer concrete with 0.6% retarder, where initial setting time occured after 6.75 hours, and the final setting time reached after 9.5 hours. Moreover, the slump of the geopolymer concrete was 8.8 cm, and the slump flow was 24 cm. The compressive strength of the geopolymer concrete at 28 days was 47.21 MPa. The experiment showed that the more retarder added, the setting time of the geopolymer concrete will be increased, thus increasing its workability.

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“…However, there are different results when usingmolarity of 10MNaOH, where the compressive strength increase is based on the increase of Na 2 SiO 3 to NaOHratios. The highest compressive strength can be achieved in ratio of 2.5 by 30.97 MPa [11]. This means that the geopolymer compressive strength can be increased by modifying the mixture namely by changing Na 2 SiO 3 to NaOH ratio as well as the molarity of NaOH.…”

Section: A Resultsmentioning

confidence: 78%

“…This means that the geopolymer compressive strength can be increased by modifying the mixture namely by changing Na 2 SiO 3 to NaOH ratio as well as the molarity of NaOH. So that, natural aggregate compressive strength of 33.0 MPa [11] can be achieved by fly ash geopolymer paste. Even fly ash geopolymer pastes is greatly possibly to have higher compressive strength.The activator ratio and the concentration of NaOH solution have an important role to the compressive strength value of the geopolymer paste.…”

Section: A Resultsmentioning

confidence: 99%

Potential Use of Fly Ash Base-Geopolymeras Aggregate Substitution in Asphalt Concrete Mixtures

Karyawan¹,

Ahyudanari²,

Ekaputri³

2017

IJET

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Abstract-Infrastructure industry is still dominant in developing countries. These activities requires a large number of aggregates. To make cement concrete and asphalt concrete, itrequires60% to 75% of aggregate in total volume of the mixture. This high volume of aggregates may cause reduction on availability of natural aggregate. Another problem is that not all area in Indonesia has the ability to provide adequate aggregates so that it can support the infrastructure development, especially in remote areas. The aggregate mobilization may face disruption. This research attempts to present an idea of creating an artificial aggregate. The artificial aggregate is made of power plant waste that is mixed with alkali silica, named as fly ash geopolymer. Previous study indicates that the use of fly ash geopolymer as filler replacement in asphalt concrete mixture, is able to double the stability of Marshall test. This experiment serves a role to design an artificial aggregate.

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Effect of Alkaline Activator Ratio to Mechanical Properties of Geopolymer Concrete with Trass as Filler

Cited by 21 publications

References 8 publications

Mechanical and physical properties of metakaolin based geopolymer paste

Mechanical and physical properties of metakaolin based geopolymer paste

Workability enhancement of geopolymer concrete through the use of retarder

Potential Use of Fly Ash Base-Geopolymeras Aggregate Substitution in Asphalt Concrete Mixtures

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