Physicochemical Characterization of Pulverized Phyllite Rock for Geopolymer Resin Synthesis

Melo, Lis Guimaraes de Azeredo; Pereira, Rachel Andrade; Pires, Eliane Fernandes Côrtes; Darwish, Fathi Aref; Silva, Felipe José da

doi:10.1590/1980-5373-mr-2016-0968

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…In this way, in general, all mortars are quite amorphous, being the most crystalline case, without reaching a very high degree compared to the raw materials, such as that of the GM-IR sample. This high degree of amorphousness of the mortars obtained is in line with the general characteristics of geopolymeric mortars [9,53]. On the other hand, Figure 9 shows a representation of bars of a semiquantitative estimate of the percentage of amorphous phase for each geopolymeric mortar studied and its comparison with the percentage of amorphous phase of OPC mortar, using Diffrac.EVA 5.2 software (Bruker, Germany) [52].…”

Section: Geopolymeric and Opc Mortarssupporting

confidence: 76%

Fabrication and Mechanical Evaluation of Eco-Friendly Geopolymeric Mortars Derived from Ignimbrite and Demolition Waste from the Construction Industry in Peru

Huamán-Mamani,

Palomino-Ñaupa,

Orta Cuevas

et al. 2024

Geosciences

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Ignimbrite rock is a volcanic material located in the Arequipa region (Peru), and for centuries, it has been used as a construction material, giving a characteristic light pastel, white to pink color to the city of Arequipa, with white being the most common. In the present study, the potential use of three types of Arequipa raw materials (ignimbrite rock powder, calcined clay powder, and demolition mortar powder) as the main source of new binders or the manufacture of environmentally friendly mortars, without the addition of ordinary Portland cement (OPC) is discussed. In this work, an in-depth characterization of the materials used was carried out. The proposed fabrication route for geopolymeric materials was considered for the manufacture of binders and mortars using an alkaline solution of NaOH with values between 12 and 18 molar, as a trigger for the geopolymerization process. Geopolymeric mortars were obtained by adding a controlled amount of fine sand to the previously prepared mixture of binder raw material and an alkaline solution. Conventional OPC and geopolymeric mortars manufactured under the same conditions were mechanically evaluated by uniaxial compression tests at a constant compression rate of 0.05 mm/min and under normal conditions of temperature and atmosphere, where the most optimal values were obtained for 15 molar alkaline solutions of ignimbrite without the addition of aggregates, with values of compressive strength of 42 MPa and a modulus elastic of 30 GPa. The results revealed a significant increase in the maximum strength and modulus of elasticity values when the volumetric fractions of OPC are completely replaced with geopolymeric binders in the study conditions of this work, demonstrating the enormous potential of the ignimbrite rock and construction waste studied, as raw material of alternative mortar binders without the addition of OPC. With this work, the ignimbrite rock, of great value in the region and also found in other areas of the Earth’s geography, was characterized and valued, in addition to the calcined clay and demolition mortar of the region.

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Section: Geopolymeric and Opc Mortarssupporting

confidence: 76%

Fabrication and Mechanical Evaluation of Eco-Friendly Geopolymeric Mortars Derived from Ignimbrite and Demolition Waste from the Construction Industry in Peru

Huamán-Mamani,

Palomino-Ñaupa,

Orta Cuevas

et al. 2024

Geosciences

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“…Furthermore, aluminum phyllosilicates or clay minerals have been established to be reactive during alkali activation since it readily dissolves in concentrated alkali solutions ( Nikolov et al., 2017 ). Additionally, these minerals are responsible for the cross-linking between the polymeric chains to form a 3-D geopolymer network ( Melo et al., 2017 ). However, the MT sample had relatively low quantity of these minerals (kaolinite = 1.9 %, zeolite = 1.3 %, muscovite = 0.9% and vermiculite = 0.2%).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Opiso

Tabelin

Maestre

et al. 2021

Heliyon

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The continuous accumulation of artisanal and small-scale gold mining (ASGM) tailings in the Philippines without adequate storage and disposal facility could lead to human health and environmental disasters in the long run. In this study, ASGM tailings was simultaneously stabilized and repurposed as construction material via geopolymerization using coal fly ash, palm oil fuel ash and a powder-based alkali activator. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) identified iron sulfides in the tailings containing arsenic (As), cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn), which could be released via weathering. The average unconfined compressive strengths (UCS) of tailings-based geopolymers at 14 days curing were 7.58 MPa and 7.7 MPa with fly ash and palm oil fuel ash, respectively. The tailings-based geopolymers with palm oil fuel ash had higher UCS most likely due to CASH reaction product formation that improved strength formation. The toxicity characteristic leaching procedure (TCLP) results showed very low leachabilities of As, Pb and Fe in the geopolymer materials suggesting ASGM tailings was effectively encapsulated within the geopolymer matrix. Overall, the geopolymerization of ASGM tailings is a viable and promising solution to simultaneously stabilize mining and industrial wastes and repurpose them into construction materials.

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“…fill ers in plas tics and mor tar, bar rier ma te rial in mu nic i pal waste land fills and in ce ment-based com pos ites (Garzón et al, 2016). Calcinated kaolinized phyllite can be used as a geopolymer resin pre cur sor (Melo et al, 2017). Phyllites have also been pro posed as a buffer ma te rial for en gi neer ing bar ri ers in geo log i cal (un der ground) ra dio ac tive waste re pos i to ries as an al ter na tive to bentonites (Ar nold et al, 1998(Ar nold et al, , 2001Shahwan and Erten, 1999;Krawczyk-Bärsch et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and organic geochemistry of phyllite from the Dewon–Pokrzywna deposit, the Opava Mountains (SW Poland)

Sawicka¹,

Janeczek²,

Fabiańska³

et al. 2018

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As so ci ate ed i tor: Tadeusz Peryt Phyllites from the Dewon-Pokrzywna de posit in the Opava Mts., SW Po land, were in ves ti gated by XRD (Rietveld method), XRF, EPMA, SEM, and ATR-FTIR from the per spec tive of their po ten tial us age as a buffer and/or back fill ma te rial in a geolog i cal re pos i tory of ra dio ac tive waste. Or ganic mat ter dis persed in the phyllite ma trix was ana lysed by GC-MS. Fine-grained Mg-Fe-mus co vite (13 to 29 wt.%), Fe-ripidolite (10 to 25 wt.%), de tri tal quartz (20 to 46 wt.%), and al bite (7 to 28 wt.%) ± microcline, illite or illite/smectite, and kaolinite are ma jor min er als in phyllite sam ples. The chlorite/mus co vite ra tio ranges from 0.65 to 1.1. Mg-annite in her ited from the pre cur sor rock is a mi nor con stit u ent. De tri tal il men ite is a dom i nant ac ces sory min eral. Ancylite-(Ce) oc curs in quartz-cal cite-ripidolite veins. Two types of phyllite have been dis tin guished based on the pro por tion of phyllosilicates to silt frac tion: ar gil la ceous (47 to 55 wt.% phyllosilicates) and silt-rich (28 wt.% phyllosilicates). Ar gil la ceous phyllite shows el e vated con tent of alu mina and mod er ate con cen tra tion of sil ica. It is highly en riched in Fe compared to phyllites from other lo cal i ties world wide. The BET spe cific sur face area of ar gil la ceous phyllite ranges from 1.73 to 3.64 m 2 /g. Whole-rock chem i cal com po si tion, min eral as sem blages, chlorite geothermometry, and the oc cur rence of aliphatic hy dro car bons sug gest that ar gil la ceous phyllite orig i nated from a pe lagic pelite protolith un der low-tem per a ture (260-370°C) greenschist to subgreenschist fa cies con di tions. Per sis tent biomarkers are in dic a tive of bac te rial deg ra da tion of plank tonic or ganic mat ter sus pended in a high wa ter col umn. En rich ment in Fe-rich chlorite and Mg,Fe-mus co vite, low volume of in ter con nected pores with dom i nant mesopores sug gest that ar gil la ceous phyllite from the Dewon-Pokrzywna deposit is a po ten tial can di date for a buffer and/or back fill ma te rial.

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Physicochemical Characterization of Pulverized Phyllite Rock for Geopolymer Resin Synthesis

Cited by 10 publications

References 13 publications

Fabrication and Mechanical Evaluation of Eco-Friendly Geopolymeric Mortars Derived from Ignimbrite and Demolition Waste from the Construction Industry in Peru

Fabrication and Mechanical Evaluation of Eco-Friendly Geopolymeric Mortars Derived from Ignimbrite and Demolition Waste from the Construction Industry in Peru

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Mineralogy and organic geochemistry of phyllite from the Dewon–Pokrzywna deposit, the Opava Mountains (SW Poland)

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