The phase evolution of phosphoric acid-based geopolymers at elevated temperatures

Liu, Leping; Cui, Xuemin; He, Yan; Liu, Si-dong; Gong, Sha

doi:10.1016/j.matlet.2011.08.043

Cited by 107 publications

(43 citation statements)

References 12 publications

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“…As previously reported, the MK-based geopolymers activated by phosphoric acid exhibited good thermal and volume stability (Liu et al, 2012). Phase transition (from aluminum hydrogen phosphate to berlinite) was observed when the geopolymer sample was subjected to elevated temperatures (900-1,550 • C).…”

Section: Thermal Stability Dielectricity and Efflorescencesupporting

confidence: 63%

“…Recently, the AAS geopolymers have been investigated from multiple angles, such as the synthesis mechanism and chemistry (Provis, 2013;Provis and Bernal, 2014;Provis et al, 2015), properties and durability Arbi et al, 2016;Ding et al, 2016), life cycle analysis (Habert et al, 2011;Ouellet-Plamondon and Habert, 2015), and multi-field applications (MacKenzie, 2015;Rao and Liu, 2015;Luukkonen et al, 2019). Yet, the available review related to the SAP geopolymer is limited even though such type of geopolymer was termed as aluminosilicate phosphate cement (Khabbouchi et al, 2017;Katsiki, 2019), phosphoric acid-based geopolymer (Liu et al, 2012;Guo et al, 2016), phosphate-based geopolymer , acid-based geopolymers (Mathivet et al, 2019), and phosphate-bonded materials (MacKenzie, 2015). This paper mainly reviews the development of the SAP geopolymers in reference with the conventional AAS geopolymers.…”

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confidence: 99%

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Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

2019

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Chemically activated materials (often termed as geopolymer) have received attracting attentions in civil, material and environmental research fields as a toolkit alternative to traditional Portland cement in specific applications. This paper presents a comparative review on silico-aluminophosphate (SAP) geopolymers in terms of definition, chemistries involved during geopolymerization, mechanical performance, durability, environmental impacts, and their potentials in applications relative to conventional alkali-aluminosilicate (AAS) geopolymers. Recommendations for future applications are also highlighted. It is found that S-A-P gels with six-coordinated aluminum environment dominate in SAP geopolymers, while the aluminum in N-A-S-H gels formed in the AAS geopolymers is characterized by four-coordinated features. Besides, the slow performance development of SAP geopolymer matrix under ambient temperature curing can be compensated through incorporating additional countermeasures (e.g., metal sources) which allow the tailored design of such geopolymers for certain in-situ applications. Generally, the calcium-bearing C-(A)-S-H gels co-existing with N-A-S-H gels are dominant in AAS geopolymers, while the S-A-P gels enhanced by phosphate-containing crystalline/amorphous phases are the main products in SAP geopolymers. The SAP geopolymers show their environmental friendliness relative to the AAS geopolymers due to the utilization of phosphate activators that require lower production energy relative to silicate-containing activators. However, the higher cost of phosphate activators may confine the applications of SAP geopolymers in some exquisite or special fields.

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Section: Thermal Stability Dielectricity and Efflorescencesupporting

confidence: 63%

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confidence: 99%

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

2019

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“…However, some attempts have been made to produce geopolymers by utilizing other sources, and evidence of production of geopolymers with reasonable performance can be found in Refs. [6][7][8]. The current research is inspired from Williams and van Riessen work [8], where borosilicate geopolymers were made by alkali activation of silica fume.…”

Section: Introductionmentioning

confidence: 99%

Flexural strength of plain and fibre-reinforced boroaluminosilicate geopolymer

Nazari

Maghsoudpour²,

Sanjayan

2015

Construction and Building Materials

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“…The phases of MK-based geopolymers obtained with phosphoric acid were reported to be thermally stable, with linear shrinkage of 5.3% after exposure at 1450 °C [14]. Also, phosphoric acid activation of synthetic Al 2 O 3 -2SiO 2 powders showed extremely high thermal stability of phases with no sign of melting up to 1550 °C [15]. Recent work reported that the structural evolution of phases with temperature and their stability depend on the phosphate content of the matrix [16].…”

Section: Introductionmentioning

confidence: 99%

Phase and dimensional stability of volcanic ash-based phosphate inorganic polymers at elevated temperatures

Djobo

Elimbi

2020

SN Appl. Sci.

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Phosphate geopolymers are part of chemically bonded phosphate cements obtained from an aluminosilicate and phosphate solution. Their structure consisting of phosphate bonds makes them suitable for use as refractory material. This study deals with the influence of phosphoric acid concentration (6, 8 and 10 mol/L) on the stability of volcanic ash-based phosphate geopolymers exposed to 100, 600 and 1000 °C. The results reveal that the onset of crystallization is about 600 °C with the formation of aluminum phosphate (V) and tridymite, then crystallization of iron (III) phosphate (V) and hematite at 1000 °C. The degree of crystallization of these phases increases with phosphoric acid concentration. The geopolymers obtained with 8 mol/L of phosphoric acid showed the best thermal stability at 1000 °C in terms of compressive strength change. The maximum thermal linear shrinkage recorded was 3%. The major phases of all geopolymers remain stable up to 1000 °C, after which the melting of phases happens.

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The phase evolution of phosphoric acid-based geopolymers at elevated temperatures

Cited by 107 publications

References 12 publications

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

Flexural strength of plain and fibre-reinforced boroaluminosilicate geopolymer

Phase and dimensional stability of volcanic ash-based phosphate inorganic polymers at elevated temperatures

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