Thermally treated clay sediments as geopolymer source material

Ferone, Claudio; Liguori, Barbara; Capasso, Ilaria; Colangelo, Francesco; Cioffi, Raffaele; Cappelletto, Elisa; Maggio, R. Di

doi:10.1016/j.clay.2015.01.027

Cited by 145 publications

(68 citation statements)

References 56 publications

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“…"Geopolymerising" capacity of each material can be verified indirectly by comparing collected data on dissolution in alkali media with literature data concerning physical and mechanical properties of geopolymers obtained from different raw materials [10,[18][19][20]. Results obtained with the dynamic test method showed a reactivity sequence of MK > HCS > NYT ≈ S both for Si and Al release, which is in accordance with mechanical performances of geopolymers obtained by using the above precursors.…”

Section: Effect Of Heat-treatment On Leachability Of Nytsupporting

confidence: 60%

“…These peaks can be attributed to the formation of sodium carbonate as a consequence of carbonation of the sodium of the alkaline solution. Moreover, the band at around 1000 cm −1 is always associated with quartz and silicate minerals (feldspar, phyllosilicates) and it can be related to the stretching of Al-O and Si-O in amorphous aluminosilicate structure [18]. This band decreases and broadens significantly in the spectra of all the residual solids (not reported here), confirming a considerable release of Si and Al and a consequent decrease of the crystallinity of the aluminosilicate structures.…”

Section: Characterization Of the Solid Residuementioning

confidence: 55%

“…The clay sediment (CS), (Si/Al = 2.77), was collected from a reservoir (Sabetta, Morigerati, Salerno) located in the south of Italy and treated up to 750 • C, in order to enhance its reactivity [18].…”

Section: Methodsmentioning

confidence: 99%

“…Firing to higher temperatures results in the formation of new unreactive phases such as feldspar and/or feldspatoids [25,26]. Anyway, a careful calcination can activate the material leading to an increase of its geopolymeric reactivity [18] and a consequent increase in terms of compression strength of the final product obtained. For this reason, the change in mineral composition of NYT heat-treated at different temperature was investigated by XRD.…”

Section: Effect Of Heat-treatment On Leachability Of Nytmentioning

confidence: 99%

“…It is well known that the thermal activation of silico-aluminate minerals in the temperature range between 400 and 800 °C results generally in a dehydroxylation [18,21], which causes the loss of the structural water and decompose into a disordered metastable state [22]. This meta-state is widely addressed as being active in pozzolanic reactions [23,24].…”

Section: Effect Of Heat-treatment On Leachability Of Nytmentioning

confidence: 99%

See 4 more Smart Citations

Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media

Liguori¹,

Capasso²,

Pertis

et al. 2017

Environments

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Abstract:The extent of the dissolution of aluminosilicate compounds is crucial, since the amount of Si and Al initially dissolved is essential for the following polycondensation and can strongly influence physical and mechanical performances of the final product. In order to set up a method to test the ability of a material to react in alkaline media, different aluminosilicate sources have been selected: a mineral resource (a zeolitized tuff), an industrial by product (silt from washing process of construction and demolition wastes), a heat treated clay sediment and a calcined clay (metakaolin). Two test methods, static and dynamic, have been applied to evaluate the attitude of a silicoaluminate precursor to give a geopolymerization reaction. In particular, a fixed amount of precursor was put into contact with a alkaline solution under continuous stirring or in static conditions at 60 • C for fixed times. The dynamic test method seems to be more suitable, since it is faster and requires lower amounts of reactants (solution). Moreover, the dynamic test provides a reactivity sequence (ordered from the more to the less reactive precursor) metakaolin > treated clay sediment > zeolitized tuff ≈ silt both for Si and Al release, which is coherent with the performances of geopolymers obtained by using the above precursors.

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Section: Effect Of Heat-treatment On Leachability Of Nytsupporting

confidence: 60%

Section: Characterization Of the Solid Residuementioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Section: Effect Of Heat-treatment On Leachability Of Nytmentioning

confidence: 99%

Section: Effect Of Heat-treatment On Leachability Of Nytmentioning

confidence: 99%

See 3 more Smart Citations

Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media

Liguori¹,

Capasso²,

Pertis

et al. 2017

Environments

View full text Add to dashboard Cite

show abstract

Synthesis and Characterization of Spent Bleaching Clay‐based Geopolymer: An Effort towards Palm Oil Industry Waste Reutilization

Ying

Azmi

Ganesan

2022

Chemistry An Asian Journal

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Spent bleaching clay (SBC) is a problematic waste from the palm oil industry with worldwide availability. In this study, geopolymer was synthesized from SBC, a kind of aluminosilicate material with an alkaline activator solution that is made up of sodium hydroxide and sodium silicate. Calcium silicate (CS), which is a by‐product of the silicates removal from wastewater, was also added to the formulation. The geopolymer mixture paste was cured in an oven at 80 °C for 24 h and at room temperature for 7 days. The characterizations were carried out using FTIR spectroscopy, SEM/EDX, TGA, BET, and XRD. The SEM images showed an aggregate of aluminosilicate material is formed with some unreacted particles on the surface of the geopolymer. The TGA results show that the geopolymers decomposed at a higher temperature than SBC, demonstrating its heat resistance properties. The BET results showed the addition of CS formed a denser geopolymer with a total pore volume of 0.0636 cm3/g.

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An environmental evaluation: A comparison between geopolymer and OPC concrete paving blocks manufacturing process in italy

Petrillo

Cioffi

Felice

et al. 2016

Env Prog and Sustain Energy

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Brick has been always one of the most used materials in the construction sector, but the traditional manufacturing process is responsible of relevant environmental and human health impacts. This context has encouraged the development and use of new building materials, such as geopolymers, which represent a great opportunity to improve sustainability and produce better performance and environmental friendly materials in the construction sector. In this study is developed an environmental evaluation of the geopolymeric and Ordinary Portland Cement (OPC) based concrete blocks manufacturing process using the Life Cycle Assessment methodology. The analysis is performed using CML 2 baseline 2000 and Eco indicator 99 methodologies. This study highlights that future research and development in the field of geopolymer concrete technology represents a potential solution for environmental protection. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1699–1708, 2016

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Thermally treated clay sediments as geopolymer source material

Cited by 145 publications

References 56 publications

Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media

Geopolymerization Ability of Natural and Secondary Raw Materials by Solubility Test in Alkaline Media

Synthesis and Characterization of Spent Bleaching Clay‐based Geopolymer: An Effort towards Palm Oil Industry Waste Reutilization

An environmental evaluation: A comparison between geopolymer and OPC concrete paving blocks manufacturing process in italy

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