Desarrollo de un cemento de base silicatada a partir de rocas volcánicas vítreas alcalinas: interpretación de los resultados preindustriales basada en la composición químico-mineralógica de los precursores geológicos

Gimeno, D.; Davidovits, Joseph; Marini, Carla; Rocher, Philippe; Tocco, S.; Cara, S.; Díaz, N.; Segura, Carlos; Sistu, Giovanni

doi:10.3989/cyv.2003.v42.i2.643

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…They used this diatomaceous earth for the production of lightweight bricks and analysed their pozzolanic behaviour. The authors observed that calcination temperature of 700°C led to dehydroxylation of kaolinite (Le Chatelier, 1887; Jeffries, 1944; Frost and Vassallo, 1996; Fernandez et al , 2011); it resulted in the collapse of the clay minerals structures as confirmed by the disappearance of clay minerals peaks in the XRD spectra, and relative change of the coordination state of Si and Al atoms as traced by NMR (Sanz et al , 1988; Chandrasekhar, 1996; Gimeno et al , 2003; Drits et al , 2016).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of wollastonite-2Mby using a diatomite precursor

2018

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Solid phase reaction synthesis of wollastonite-2Mby a natural rock precursor as the source of amorphous silica and CaCO3is reported. Chemical treatments were carried out on a diatomitic rock from Crotone (Calabria, Italy) in order to measure its reactive silica and CaCO3contents. Four series of synthesis were performed at 1000°C at ambient pressure by mixing, at different stoichiometry, the diatomitic rock with a natural limestone as a source of additive CaCO3, and sodium carbonate (Na2CO3) as triggering agent.Wollastonite-2Mwas characterized by chemo-physical, crystallographical and morphological-microtextural analyses. All these characterizations, together with infrared and nuclear magnetic resonance (29Si) responses provide values comparable to literature data. Estimation of the amorphous phase in the synthesis powders was performed through quantitative phase analysis using the combined Rietveld and reference intensity ratio methods, resulting in a final product of 96.3% wollastonite-2M.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of wollastonite-2Mby using a diatomite precursor

2018

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“…A recent work has evaluated the use of ignimbrite powder in reactive powder concrete road pavement, showing the many possibilities of this material for construction [27]. Ignimbrite, as well as other pyroclastic vitreous volcanic rocks extracted directly from mining prospects, was previously studied for the realization of geopolymeric materials [28]. To our knowledge, there is no literature that studies the properties of geopolymers prepared from ignimbrite rocks from the Arequipa region in Peru.…”

Section: Introductionmentioning

confidence: 99%

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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“…This suitability is not rare, if we take into account the pore size of these zeolites and the molecular dimension of ammonia [40,41]. In Italy, the zeolitite rocks correspond to a large number of pyroclastic volcanic units mainly related to the potassic alkaline province that are mined for building purposes at great scale since Etruscan and Roman times till today (see in example [42][43][44] and references therein). Italian zeolite suppliers recycle sawing waste of dimension stone blocks for the quarries; and Italian researchers have prospected since 60's of XX century industrial uses of these zeolitites.…”

Section: Introductionmentioning

confidence: 99%

On the Suitability of Phillipsite-chabazite Zeolitite Rock for Ammonia Uptake in Water. Some General Zeolite Features and a Case Study From the Pescara River (Italy)

Novembre

Gimeno

Calista

et al. 2022

Preprint

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Ionic exchange tests have been performed on superficial wastewaters to remove ammonia by the use of a volcanic zeolitized rock from Lazio Region (Central Italy). The zeolitite (natural zeolite) is characterized by chabazite, phillipsite and minor amounts of sanidine, leucite and analcime. After preliminary column experiments in laboratory focused to determine the saturation time of the zeolitite, a pilot plant was built up on a little water course near the area of San Giustino channel (Abruzzo Region, Central Italy). Wastewaters, characterised by starting ammonia value ranging between 5 and 120 mg/l, were filtered with a zeolitic bed. The first experimental results indicate a positive ammonia reduction of about 80-90% and, in all cases, NH4+ concentration values under the EU law limits. A main purpose of this paper is to evidence that most of studies published on uptake of ammonia by means of zeolitite lead with clinoptilolite-dominant zeolitite despite the large availability and best performance of phillipsite-chabazite zeolites. Last but not least, a large number of published studies are of difficult comparison because of poor characterization of the zeolitite used.

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Desarrollo de un cemento de base silicatada a partir de rocas volcánicas vítreas alcalinas: interpretación de los resultados preindustriales basada en la composición químico-mineralógica de los precursores geológicos

Cited by 7 publications

References 7 publications

Synthesis and characterization of wollastonite-2Mby using a diatomite precursor

Synthesis and characterization of wollastonite-2Mby using a diatomite precursor

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

On the Suitability of Phillipsite-chabazite Zeolitite Rock for Ammonia Uptake in Water. Some General Zeolite Features and a Case Study From the Pescara River (Italy)

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