Effect of the silicate activator pH on the microstructural characteristics of waste-based geopolymers

Phair, John W.; Deventer, J.S.J. van

doi:10.1016/s0301-7516(02)00013-3

Cited by 251 publications

(126 citation statements)

References 16 publications

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“…3. The strong peak at ~1000 cm 1 is associated with Al-O and Si-O asymmetric stretching vibrations and is the fingerprint of the geopolymerisation [31]. The FTIR spectra show a broad peak in the region at 3466 cm 1 corresponding to the hydroxyl (OH) stretching vibration of free and hydrogen bonded -OH groups [32,33], and the absorbance peak around 1653 cm 1 is attributed to the bending vibration of absorbed water [34,35].…”

Section: Ftir Observationmentioning

confidence: 99%

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

et al. 2015

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This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites. Geopolymer composites reinforced with 2.4, 3.0 and 4.1 wt% woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength, flexural modulus, compressive strength, hardness, and fracture toughness. All mechanical properties were improved by increasing the flax fibre contents, and showed superior mechanical properties over a pure geopolymer matrix. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites. The thermal behaviour of composites was studied by thermogravimetric analysis (TGA) and the results showed significant degradation of flax fibres at 300 ℃.

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Section: Ftir Observationmentioning

confidence: 99%

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

et al. 2015

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“…as well as on the alkalinity of activating solution and on the curing conditions [5][6][7][8]. As can be observed in the literature, most of papers are related to the use of blast furnace slag [9][10][11], fly ash [12][13] and metakaolin [14][15] as an aluminosilicate material in the production of alkali-activated materials.…”

Section: Introductionmentioning

confidence: 99%

Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

Tashima

Akasaki

Melges

et al. 2013

Fuel

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Reuse of industrial and agricultural wastes as supplementary cementitious materials (SCM) in concrete and mortar productions contribute to sustainable development. In this context, Fluid catalytic cracking catalyst residue (spent FCC), a byproduct from the petroleum industry and petrol refineries, have been studied as SCM in blended Portland cement in the last years. Nevertheless, others environmental friendly alternative has been conducted in order to produce alternative binders with low CO 2 emissions. The use of aluminosilicate materials in the production of Alkali-Activated Materials (AAM) is an ongoing research topic which can present low CO 2 emissions associated. Hence, this paper studies some variables that can influence the production of AAM based on spent FCC. Specifically, the influence of SiO 2 /Na 2 O molar ratio and the H 2 O/spent FCC mass ratio on the mechanical strength and microstructure are assessed.Some instrumental techniques, such as SEM, XRD, pH and electrical conductivity measurements, and MIP are performed in order to assess the microstructure of formed alkali-activated binder. Alkali activated mortars with compressive strength up to 80 MPa can be formed after curing for three days at 65 ºC. The research demonstrates the potential of spent FCC to produce alkali-activated cements and the importance of SiO 2 /Na 2 O molar ratio and the H 2 O/spent FCC mass ratio in optimising properties and microstructure.

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“…The strong peak at ~1000 cm -1 is associated with Al-O and Si-O asymmetric stretching vibrations and is the fingerprint of the geopolymerisation [13]. The bands seen at 3593 cm -1 is attributed to stretching vibration of -OH and 1644 cm -1 is bending vibrations of H-O-H [14].…”

Section: Resultsmentioning

confidence: 96%

“…The band at 558 cm -1 is correspond to double-ring linkage [15]. The peak at ~460 cm -1 is assigned to in-plane bending of Al-O and Si-O linkages [13].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Curing Conditions on the Properties of Geopolymer Samples

Arioz¹,

Arıöz²,

Koçkar³

2013

IJCEA

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Abstract-Geopolymers or inorganic polymers are getting increasing attention due to being environmentally friendly and having great potential for applications in various industries. Geopolymers have three dimensional amorphous structure and can be synthesized from by products such as fly ash, blast furnace slag or geological materials such as kaolinite.In this experimental study F class fly ash was used as a raw material and geopolymer samples were synthesized by means of sodium silicate and 8 M sodium hydroxide solutions. These samples were cured at 80°C for three different durations (6h, 15h and 24h). Compressive strength tests were carried out at 7 and 28 days. The maximum compressive strength was found to be 40.35 MPa. The compressive strength values indicated that the curing conditions influenced the physical properties of geopolymer samples. As the curing duration increased, the compressive strengths increased.XRD and FTIR techniques were used to characterize the fly-ash based geopolymers. In FTIR spectra it has seen that geopolymerisation has been achieved successfully. The major fingerprint for the geopolymer has obtained. It was also observed that there was no significant effect of curing conditions on the microstructure of the samples. FTIR and XRD spectrums were nearly the same with increasing duration.

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Effect of the silicate activator pH on the microstructural characteristics of waste-based geopolymers

Cited by 251 publications

References 16 publications

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

The Effect of Curing Conditions on the Properties of Geopolymer Samples

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