Long term durability properties of class F fly ash geopolymer concrete

Law, David W.; Adam, Andi Arham; Molyneaux, T; Patnaikuni, Indubhushan; Wardhono, Arie

doi:10.1617/s11527-014-0268-9

Cited by 206 publications

(49 citation statements)

References 25 publications

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“…However, to date limited research has been undertaken on understanding the impact of the variations in the chemical composition and physical properties of the precursor fly ash material used and how their interaction determine the strength of the geopolymer produced [20][21][22]. Activation of the fly ash has been hypothesised as being due to a number of factors, both the Activator Modulus (AM) and the Na 2 O dosage have been identified as having a significant impact upon the strength [11,18,23,24]. The AM is defined as the SiO 2 to Na 2 O ratio in alkali activator solution and the Na 2 O dosage is described as the percentage of Na 2 O to fly ash ratio in the alkali activator solution, while previously the activator dosage was considered in terms of the mass ratio of Na + to fly ash [25].…”

Section: Introductionmentioning

confidence: 99%

Zeta potential, gel formation and compressive strength of low calcium fly ash geopolymers

Gunasekara

Setunge

Sanjayan

2015

Construction and Building Materials

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135

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Section: Introductionmentioning

confidence: 99%

Zeta potential, gel formation and compressive strength of low calcium fly ash geopolymers

Gunasekara

Setunge

Sanjayan

2015

Construction and Building Materials

Self Cite

135

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“…The solubility of alkali carbonates, such as natrite 215 g/L, is usually higher than that of calcium carbonate (calcite 0.015 g/L), which can lead to an increase in binder porosity and at the same time a decrease in alkalinity. Consequently, Law et al and König et al described difficulties in the quantification of carbonation depths by the addition of a phenolphthalein solution. Despite pH values between 10.9 and 12.0 determined by wet‐chemical methods, only a slight discoloration of the cross section can be observed.…”

Section: Performance Of Structural Concretes Based On Aabsmentioning

confidence: 88%

Structural concrete based on alkali‐activated binders: Terminology, reaction mechanisms, mix designs and performance

Herrmann

Köenig

Dehn

2017

Structural Concrete

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The interest in concretes based on alkali‐activated binders (AABs) is increasing significantly along with the continued research into and development of these novel construction materials from lab scale to practical application. The paper summarizes current knowledge about concretes based on AABs to address the following questions: What are structural concretes based on AABs? What are the specific characteristics with regard to the chemical binder reaction? What has to be considered for the mix designs of AACs? And which material performances can be expected?

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“…This polycondensation reaction yields three-dimensional zeolitic frameworks, and the term "geopolymerisation" was given by Davidovits (1994). In the early stage of development, metakaolin was used as aluminosilicate materials (Davidovits, 1976), however many researchers now utilize low calcium fly ash (class F) as the precursor of geopolymer concrete not only due to the excellent properties of the resulted concrete but also because of the wide availability of the materials without any further treatments (Hardjito et al, 2004;Law et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Water to Solid Ratio, Activator to Binder Ratio, and Lime Proportion on the Compressive Strength of Ambient-Cured Geopolymer Concrete

Adam

2019

Journal of the Civil Engineering Forum

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Low calcium fly ash based Geopolymer has been proven to be one of the potential alternatives substitutes to Portland Cement not only due to its high resistance to chemical attack but also because of the vast availability of class F fly ash for raw materials. However, one of the limitations of geopolymer as the alternative binders in concrete is that the strength develops slowly under ambient condition. This paper presented the investigation of water to solid ratio, activator to binder ratio, and lime proportion on the compressive strength of ambient-cured geopolymer concrete. To develop sufficient strength at an early age, class F fly ash and slaked lime (Ca (OH)2) were used as the binder with the proportion of lime to binder of 4%, 5%, 6%, and 7%. The blended binder was activated by sodium silicate and sodium hydroxide solution with the variation of activator to binder ratio of 0.45, 0.5, 0.55, and 0.6. The water to solid ratio of 0.30, 0.31, 0.32, and 0.33 was chosen to facilitate good workability which was done by adding water to the mix. The compressive strength tests were conducted at 7, 14, and 28 days on the cylindrical concrete specimens with a dimension of 100 mm diameter and 200 mm height. The results show that the activator to binder ratio of 0.50 to 0.55, and the proportion of lime to the binder of 6% to 7% were the optimum range value. It was also found that the lower the water to cement ratio the higher the compressive strength and the water to solid ratio as low as 0.3 produced the highest compressive strength while still maintaining good workability.

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Long term durability properties of class F fly ash geopolymer concrete

Cited by 206 publications

References 25 publications

Zeta potential, gel formation and compressive strength of low calcium fly ash geopolymers

Zeta potential, gel formation and compressive strength of low calcium fly ash geopolymers

Structural concrete based on alkali‐activated binders: Terminology, reaction mechanisms, mix designs and performance

The Effects of Water to Solid Ratio, Activator to Binder Ratio, and Lime Proportion on the Compressive Strength of Ambient-Cured Geopolymer Concrete

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