Use of Thermal Analysis in Zeolite Research and Application

Colella, C.

doi:10.1007/978-3-662-03871-0_6

Cited by 8 publications

(6 citation statements)

References 43 publications

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“…In this case, compressive strength measurements are much higher than those reported in Figure 1 for geopolymer pastes and are comparable, if not greater, than those reported in the literature [ 59 ]. The substitution of 50% of metakaolin with a stiff and high strength material such as fine quartz powder, was expected to considerably increase the strength of the system [ 61 ].…”

Section: Applicationsupporting

confidence: 83%

“…This endothermic shoulder is due to the evaporation of “zeolitic” [59] or “interstitial” [58] water. This type of water is associated with activating and extra-framework cations in the form of solvation water.…”

Section: Resultsmentioning

confidence: 99%

“…The DSC signals show a first endothermic peak at temperatures lower than 100n °C, which can be attributed to the evaporation of “free” water [ 57 , 58 ], and an endothermic shoulder which becomes more evident as the Si/Al ratio decrease. This endothermic shoulder is due to the evaporation of “zeolitic” [ 59 ] or “interstitial” [ 58 ] water. This type of water is associated with activating and extra-framework cations in the form of solvation water.…”

Section: Resultsmentioning

confidence: 99%

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Application-Oriented Chemical Optimization of a Metakaolin Based Geopolymer

et al. 2013

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In this study the development of a metakaolin based geopolymeric mortar to be used as bonding matrix for external strengthening of reinforced concrete beams is reported. Four geopolymer formulations have been obtained by varying the composition of the activating solution in terms of SiO2/Na2O ratio. The obtained samples have been characterized from a structural, microstructural and mechanical point of view. The differences in structure and microstructure have been correlated to the mechanical properties. A major issue of drying shrinkage has been encountered in the high Si/Al ratio samples. In the light of the characterization results, the optimal geopolymer composition was then applied to fasten steel fibers to reinforced concrete beams. The mechanical behavior of the strengthened reinforced beams was evaluated by four-points bending tests, which were performed also on reinforced concrete beams as they are for comparison. The preliminary results of the bending tests point out an excellent behavior of the geopolymeric mixture tested, with the failure load of the reinforced beams roughly twice that of the control beam.

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Section: Applicationsupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Application-Oriented Chemical Optimization of a Metakaolin Based Geopolymer

et al. 2013

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“…When the pozzolanic material is a zeolite, difficulties arise in the interpretation of TG profiles, because of the joint presence of zeolitic water. It is well known that zeolite presents several physical and chemical changes on heating [30]. Among the others, the zeolitic water, occupying different sites within the framework, smoothly leaves from the lattice in a wide thermal range, usually from room temperature to roughly 300 • C (although a minor but usually negligible water loss due to the presence of a few hydroxyls in zeolite structure sometimes occurring).…”

Section: Estimation Of Pozzolanic Activitymentioning

confidence: 99%

Pozzolanic Activity of Zeolites: The Role of Si/Al Ratio

et al. 2019

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A great challenge of research is the utilization of natural or synthetic zeolites, in place of natural pozzolans, for manufacturing blended cements. The difficulties of interpretation of the pozzolanic behavior of natural zeolite-rich materials and the role played by their nature and composition can be overcome by studying more simple systems, such as pure synthetic zeolites. This study aims at investigating the pozzolanic ability of isostructural zeolites with different framework compositions, such as three sodium zeolites of the faujasite (FAU) framework type: LSX, X, and Y. The pozzolanic activity has been estimated by thermogravimetry and X-ray diffraction analysis. The overall outcome of the investigation is that the zeolite structure affects its pozzolanic activity, as zeolites with similar framework densities exhibit distinct abilities to fix lime. Moreover, the framework composition is effective either from a kinetic point of view or on the total amount of fixed lime. Zeolite X appears to possess the best average features.

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“…Results show an endotherm between 110°C and 130°C. While some work reported it as evidence of the decomposition of combined "non-evaporable" water in the form of aluminosilicate gel [29], others work associated it to the evaporation interstitial water [30]. However, it was noticed the endothermic peak shifted towards higher temperatures (170-180°C) in mixes 2 and 3.…”

Section: Ftir Analysismentioning

confidence: 99%

Effect of GGBS and curing temperature on microstructure characteristics of lightweight geopolymer concrete

et al. 2017

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Abstract. Cement replacement by supplementary cementitious materials has been gaining momentum as a sustainable mechanism to reduce greenhouse gas emissions while also recycling industrial by-products. This paper presents the development and microstructure characterization of fly ash-based lightweight geopolymer concrete incorporating ground granulated blast furnace slag (GGBS). Concrete samples were prepared with 0%, 25% and 50% GGBS replacement and cured at 30°C, 60°C, and ambient temperature. While dune sand and lightweight expanded clay were used as aggregates, a mixture of sodium silicate and sodium hydroxide served as the alkaline activation solution. Microstructure evaluation was carried out at 7 and 28 days employing scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). Residual fly ash and GGBS were identified in the concrete and bonded to geopolymeric reaction products. The microstructure highlighted the formation and coexistence of aluminosilicate hydrate and aluminum-rich calcium silicate hydrate with traces of sodium. Subsequent polymerization was also verified by an increase in FTIR and DSC peaks.

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Use of Thermal Analysis in Zeolite Research and Application

Cited by 8 publications

References 43 publications

Application-Oriented Chemical Optimization of a Metakaolin Based Geopolymer

Application-Oriented Chemical Optimization of a Metakaolin Based Geopolymer

Pozzolanic Activity of Zeolites: The Role of Si/Al Ratio

Effect of GGBS and curing temperature on microstructure characteristics of lightweight geopolymer concrete

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