Characterization of FDR fly ash and brick/lime mixtures

Ubbrı̀aco, Pietro; Traini, A.; Manigrassi, D. A. P.

doi:10.1007/s10973-007-8853-6

Cited by 8 publications

(8 citation statements)

References 7 publications

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“…Finally, in the last zone, at temperature higher than 900°C a lower than 1100°C, the CA formation occurs according to DTA. The formation of the different aluminate phases agrees to the XRD results and the bibliographic data [13,14].…”

Section: Precursor Characterizationsupporting

confidence: 85%

“…The pattern of precursor obtained at pH 7 can be assigned to 3CaOÁAl 2 O 3 ÁCaCl 2 Á 10H 2 O (JCPDS 35-0105) which is a hydrated calcium aluminate with partial substitution of oxygen by chloride. The presence of this phase reveals the formation of reactive aluminate phases in the early stage of precursor formation, when CaO is added to the oxy-hydroxide aluminium gel [13]. The same phase is observed as the unique crystalline phase for precursor at pH 10.…”

Section: Precursor Characterizationmentioning

confidence: 77%

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Study by DTA/TG of the formation of calcium aluminate obtained from an aluminium hazardous waste

López‐Delgado¹,

López²,

Gonzalo-Delgado³

et al. 2009

J Therm Anal Calorim

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A Spanish hazardous waste from tertiary aluminium industry was used as a raw material for the synthesis of calcium aluminate. An amorphous precursor was obtained by a hydrothermal method at different values of pH. The transformation of the precursor in a crystalline aluminate was followed by TG/DTA up to 1300°C. At temperatures between 719 and 744°C, the precursors evolve towards the formation of C 12 A 7 which becomes CA at circa 1016°C. Mass spectrometry coupled to thermal analyser allowed the identification of the decomposition products.

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Section: Precursor Characterizationsupporting

confidence: 85%

Section: Precursor Characterizationmentioning

confidence: 77%

Study by DTA/TG of the formation of calcium aluminate obtained from an aluminium hazardous waste

López‐Delgado¹,

López²,

Gonzalo-Delgado³

et al. 2009

J Therm Anal Calorim

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“…To further study the variation of the internal composition of the specimens with the degree of hydration, the variation law of chemically bound water and Ca(OH) 2 in the specimens at different ages was analyzed by TG. As can be seen from Figures 9 and 10 the weight loss of the specimen can be divided into four stages: −30-105 • C, 105-400 • C, 400-500 • C, and 500-800 • C. Where the weight loss below 105 • C is the evaporation of free water, 105-400 • C can be identified as C-(A)-S-H gel to remove chemically bound water, 400-500 • C is the dehydration of Ca(OH) 2 , and 500-800 • C is the decomposition of CaCO 3 [52,53].…”

Section: Tg Analysismentioning

confidence: 99%

Study on the Hydration and Microstructure of B and B/Na Ion-Doped Natural Hydraulic Lime Composed with Silica Fume/Fly Ash

et al. 2022

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Natural hydraulic lime (NHL) has drawn much attention due to its environmentally friendly nature. The characteristics of both hydraulic and pneumatic components make it a potential substitute for Portland cement in surface decoration and ancient building restoration. In this study, both doping and mixing with supplementary cementitious materials were investigated. Two types of NHL3.5 were fabricated through calcination at 1200 °C with B and B/Na doping, respectively. It is noted that B ion doping is beneficial to the early compressive strength of the specimens, and B/Na doping is beneficial to the later compressive strength of the specimens. The observed outcome is that the compressive strengths of B and coupled B/Na doped NHL3.5 are higher than the blank sample due to the appearance of α’-C2S. Thereafter, the blank and doping NHL were incorporated with fly ash and silica fume. The incorporation of fly ash and silica fume could enhance the early and late hydration rate. Of the two, silica fume shows more pozzolanic effect in the early age. In the supplementary cementitious materials dosed group, pozzolanic dominates the hydration process.

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“…Η κορυφή στα ~465 cm -1 σχετίζεται με την ύπαρξη δεσμών Si-O και / ή Al-O σε αργιλοπυριτικά υλικά ( [Yu et al, 1999], [Ζαχαράκη, 2009]), και βρίσκεται τόσο στο φάσμα της ποζολάνης όσο και στα φάσματα της σύνθεσης (με αμετάβλητη την ένταση με την αύξηση του χρόνου ενυδάτωσης. Ubbriaco et al, 2008], [Giergiczny, 2006], [Moropoulou et al, 2004a], [Bakolas et al, 2008], [Bruno et al, 2004], [Silva et al, 2005], [Frias and Cabrera, 2001], [Ubbriaco and Tasselli, 1998] Ubbriaco and Tasselli, 1998], [Frias and Cabrera, 2001], [Moropoulou et al, 2004a], [Bakolas et al, 2008], [Miller et al, 2010] ).…”

Section:  σύνθεση Cahg3unclassified

“…Μελέτη του μηχανισμού πήξης κονιαμάτων τύπου ασβέστη -φυσικής ποζολάνης Μαρία Τζιότζιου 130 [Ubbriaco and Tasselli, 1998], [Ubbriaco et al, 2008] ΙΙΙ.44 α, β, γ, δ, ε, ζ, η, θ, ι).…”

unclassified

Μελέτη Του Μηχανισμού Πήξης Κονιαμάτων Τύπου Ασβέστη - Φυσικής Ποζολάνης

Tziotziou¹,

Τζιότζιου²

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Ο µηχανισµός πήξης υδραυλικών κονιαµάτων τύπου ασβέστη – φυσικής ποζολάνης µελετήθηκε σεπραγµατικό χρόνο, µέσω της διαδικασίας της ενυδάτωσης µε την µη- καταστρεπτική τεχνική τουπυρηνικού µαγνητικού συντονισµού πρωτονίου (1H NMR). Επιπροσθέτως τα αποτελέσµατα του 1HNMR συγκρίθηκαν µε εκείνα καταστρεπτικών τεχνικών, όπως XRD, FT-IR, DTA-TG, SEM, ΜΙP καιBET. Η µελέτη της εξέλιξης της µικροδοµής µε 1H NMR έδωσε αποτελέσµατα που ήταν σε συµφωνίαµε αυτά των MIP και SEM. Περαιτέρω µε την DTA-TG ανάλυση ταυτοποιήθηκαν ποσοτικά οιενυδατωµένες φάσεις της αντίδρασης ασβέστη – φυσικής ποζολάνης. Συγκεκριµένα, η µελέτη τηςκινητικής της ενυδάτωσης µε DTA-TG και 1H NMR έδωσε άµεσα συσχετιζόµενα αποτελέσµατα καιανέδειξε τα ακόλουθα: α) η συµµετοχή λεπτόκοκκης ποζολάνης στο κλάσµα του συνδετικού υλικούαυξάνει δραστικά την ταχύτητα και την απόδοση της αντίδρασης ενυδάτωσης και β) η αύξηση τηςσυγκέντρωσης της ποζολάνης στο κλάσµα του συνδετικού υλικού οδηγεί στην αύξηση της ταχύτηταςκαι της απόδοσης της αντίδρασης ενυδάτωσης. Εν κατακλείδι, αποδείχτηκε ότι η δυνατότηταεφαρµογής του 1H NMR µε φορητό µαγνήτη και σε πραγµατικό χρόνο, παρέχει το σηµαντικόπλεονέκτηµα της εφαρµογής της µεθόδου in situ, µε δυνατότητα άµεσης παρακολούθησης της εξέλιξηςτης µικροδοµής κατά την ενυδάτωση και εκτίµησης του σταδίου ωρίµανσης των κονιαµάτων.

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Characterization of FDR fly ash and brick/lime mixtures

Cited by 8 publications

References 7 publications

Study by DTA/TG of the formation of calcium aluminate obtained from an aluminium hazardous waste

Study by DTA/TG of the formation of calcium aluminate obtained from an aluminium hazardous waste

Study on the Hydration and Microstructure of B and B/Na Ion-Doped Natural Hydraulic Lime Composed with Silica Fume/Fly Ash

Μελέτη Του Μηχανισμού Πήξης Κονιαμάτων Τύπου Ασβέστη - Φυσικής Ποζολάνης

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