Properties of class F fly ash based geopolymer mortar produced with alkaline water

JaiSai, Tenepalli; Neeraja, D.

doi:10.1016/j.jobe.2018.04.031

Cited by 19 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The behavior of geopolymer mortar highly depends on many factors, mainly the chemical composition of the source materials and its particle size distribution, curing conditions, and the type and concentration of the alkali activators [10][11][12]. For the production of geopolymers, the choice of source materials creates challenges since it depends on many factors, including end-use availability, costing, and type of application used.…”

Section: Introductionmentioning

confidence: 99%

Ambient and Heat-Cured Geopolymer Composites: Mix Design Optimization and Life Cycle Assessment

2022

View full text Add to dashboard Cite

The feasibility of producing sustainable cement-free composites and its environmental impact were investigated in this research. Experimental parametric evaluation was carried out in this regard to explore the optimum mix design of the composites. The effect of synthesis parameters and curing conditions on the behavior of the produced geopolymer composites was investigated. The studied parameters included the molarity of the sodium hydroxide solution (12 M, 14 M, and 16 M), the sodium silicate to sodium hydroxide ratio (1, 1.5, 2, and 2.5), the fluid to binder ratio (0.6, 0.65, and 0.7), and the age. The curing conditions included ambient curing and heat treatment at 40 °C, 80 °C, and 120 °C for 24 h, 48 h, and 72 h. In addition, life cycle assessment was performed to compare the environmental impact of geopolymer and cementitious composites. The results reflected the possibility of producing geopolymer composites with significant positive environmental impacts over traditional cementitious composites. The synthesis parameters played a major role in the behavior of the produced geopolymers. Heat curing was necessary for the geopolymer mortar to achieve high early strength. However, strength development with age was more obvious for ambient-cured specimens than heat-cured specimens. The optimum fluid to binder ratio used in this research was 0.6. For this ratio, the compressive strength increased as the molarity of the sodium hydroxide solution increased for all sodium silicate to sodium hydroxide ratios. Finally, SEM images showed that the higher the molarity and as the amount of reacted FA particles increased, the better the microstructure of the geopolymer mortar was and the fewer pores the matrix had.

show abstract

Section: Introductionmentioning

confidence: 99%

Ambient and Heat-Cured Geopolymer Composites: Mix Design Optimization and Life Cycle Assessment

2022

View full text Add to dashboard Cite

show abstract

“…e NaOH concentrations are varied from 8 M to 14 M with 2 M increment based on previous studies [31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

A New Artificial Neural Network Model for the Prediction of the Effect of Molar Ratios on Compressive Strength of Fly Ash‐Slag Geopolymer Mortar

John

Cascardi

Nadir

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Geopolymers are inorganic polymers produced by the alkali activation of alumina-silicate minerals. Geopolymer is an alternative cementitious binder to traditional Ordinary Portland Cement (OPC) leading to economical and sustainable construction technique by the utilisation of alumina-silicate waste materials. The strength development in fly ash-slag geopolymer mortar is dependent on the chemical composition of the raw materials. An effective way to study the effect of chemical components in geopolymer is through the evaluation of molar ratios. In this study, an Artificial Neural Network (ANN) model has been applied to predict the effect of molar ratios on the 28-day compressive strength of fly ash-slag geopolymer mortar. For this purpose, geopolymer mortar samples were prepared with different fly ash-slag composition, activator concentration, and alkaline solution ratios. The molar ratios of the geopolymer mortar samples were evaluated and given as input to ANN, and the compressive strength was obtained as the output. The accuracy of the assessed model was investigated by statistical parameters; the mean, median, and mode values of the ratio between actual and predicted strength are equal to 0.991, 0.973, and 0.991, respectively, with a 14% coefficient of variation and a correlation coefficient of 89%. Based on the mentioned findings, the proposed novel model seems reliable enough and could be used for the prediction of compressive strength of fly ash-slag geopolymer. In addition, the influence of molar compositions on the compressive strength was further investigated through parametric studies utilizing the proposed model. The percentages of Na2O and SiO2 of the source materials were observed as the dominant chemical compounds in the mix affecting the compressive strength. The influence of CaO was significant when combined with a high amount of SiO2 in alkaline solution.

show abstract

“…Class (F) fly-ash has less than 10% calcium oxide (CaO), while Class (C) fly-ash contains more than 20% calcium [39]. Low calcium fly-ash has increased silica and alumina contents that may promote geopolymer production with superior mechanical properties [36]; thus, Class (F) fly-ash is preferable for geopolymer production, compared to Class (C) fly-ash [8,36,40,41].…”

Section: The N-a-s-h Geopolymer Model For Soil Stabilisationmentioning

confidence: 99%

Review of Fly-Ash-Based Geopolymers for Soil Stabilisation with Special Reference to Clay

2020

View full text Add to dashboard Cite

Alkali-activated binders, more commonly referred to as “geopolymers”, have recently emerged as a good alternative to traditional binders (e.g., lime and cement) for soil stabilisation. Geopolymers utilise the alkaline activation of industrial waste to form cementitious products within treated soils, leading to enhanced soil properties. This paper aims to present a review of the use of fly-ash-based geopolymers for soil stabilisation, with special reference to clay. The paper provides some detailed chemical and geotechnical cross-disciplinary knowledge, which advances fly-ash geopolymer as an eco-friendly binder. The paper covers the salient features of the geopolymer treatment process, including key affecting factors, envisioned applications, potential advantages and major limitations. The paper also discusses the main challenges standing against the wide recognition of this technique for soil stabilisation by industry. The paper finally concludes that fly-ash geopolymer can be used successfully as a binder for soil stabilisation; however, further research is still needed to realise the full potential of this promising technique in the future.

show abstract

Properties of class F fly ash based geopolymer mortar produced with alkaline water

Cited by 19 publications

References 11 publications

Ambient and Heat-Cured Geopolymer Composites: Mix Design Optimization and Life Cycle Assessment

Ambient and Heat-Cured Geopolymer Composites: Mix Design Optimization and Life Cycle Assessment

A New Artificial Neural Network Model for the Prediction of the Effect of Molar Ratios on Compressive Strength of Fly Ash‐Slag Geopolymer Mortar

Review of Fly-Ash-Based Geopolymers for Soil Stabilisation with Special Reference to Clay

Contact Info

Product

Resources

About