Powders < 3mm of pumice and lapillus (quarry scraps of national volcanic minerals) were employed in the tailoring and characterization (from the physical, chemical and mechanical point of view) of geo-polymers and lightweight aggregates. Geo-polymers were obtained at room temperature by substituting 70 - 80 wt% of metakaolin by volcanic scraps and employing an alkaline solution with a Na2SiO3/NaOH ratio from 0.8 to 1 for pumice and lapillus series, respectively. Within 24 h and in water, bulk specimens resulted with good integrity, with pH values around 9-11 and conductivity increasing over time, but less for the lapillus-containing sample richest in metakaolin indicating more compactness. The porosity, ranging around 32-33% for all the samples, increased up to 45% for the formulation based on 80% of lapillus. The best mechanical performance was achieved by lapillus samples: compressive strength in the range 35-38 MPa against 6-8 MPa of pumice ones. Lightweight aggregates were created by powder sintering at 1000 °C for 1 hour of 85 wt% of volcanic scraps and 15 wt% of spent coffee grounds used as pouring agent. Additional formulations were realized adding 50 wt% of nourishing mixture P and K-containing in the form of animal bone meal and vegetable biomass ashes. The specimens resulted porous and light (porosity around 60%), with good capacity of water retains, and, except in two cases, with neutral pH and conductivity values below 2 mS/cm, indicating a possible use for substrate (growing layer) in roof gardens, green roofs, house gardens, etc..

Preliminary study on valorization of scraps from the extraction of volcanic minerals / Piccolo, F.; Gallo, F.; Andreola, F.; Lancellotti, I.; Maggi, B.; Barbieri, L.. - In: ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL. - ISSN 1582-9596. - 20:10(2021), pp. 1599-1610. [10.30638/eemj.2021.148]

Preliminary study on valorization of scraps from the extraction of volcanic minerals

Piccolo F.;Gallo F.;Andreola F.;Lancellotti I.;Barbieri L.
2021

Abstract

Powders < 3mm of pumice and lapillus (quarry scraps of national volcanic minerals) were employed in the tailoring and characterization (from the physical, chemical and mechanical point of view) of geo-polymers and lightweight aggregates. Geo-polymers were obtained at room temperature by substituting 70 - 80 wt% of metakaolin by volcanic scraps and employing an alkaline solution with a Na2SiO3/NaOH ratio from 0.8 to 1 for pumice and lapillus series, respectively. Within 24 h and in water, bulk specimens resulted with good integrity, with pH values around 9-11 and conductivity increasing over time, but less for the lapillus-containing sample richest in metakaolin indicating more compactness. The porosity, ranging around 32-33% for all the samples, increased up to 45% for the formulation based on 80% of lapillus. The best mechanical performance was achieved by lapillus samples: compressive strength in the range 35-38 MPa against 6-8 MPa of pumice ones. Lightweight aggregates were created by powder sintering at 1000 °C for 1 hour of 85 wt% of volcanic scraps and 15 wt% of spent coffee grounds used as pouring agent. Additional formulations were realized adding 50 wt% of nourishing mixture P and K-containing in the form of animal bone meal and vegetable biomass ashes. The specimens resulted porous and light (porosity around 60%), with good capacity of water retains, and, except in two cases, with neutral pH and conductivity values below 2 mS/cm, indicating a possible use for substrate (growing layer) in roof gardens, green roofs, house gardens, etc..
ott-2021
20
10
1599
1610
Preliminary study on valorization of scraps from the extraction of volcanic minerals / Piccolo, F.; Gallo, F.; Andreola, F.; Lancellotti, I.; Maggi, B.; Barbieri, L.. - In: ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL. - ISSN 1582-9596. - 20:10(2021), pp. 1599-1610. [10.30638/eemj.2021.148]
Piccolo, F.; Gallo, F.; Andreola, F.; Lancellotti, I.; Maggi, B.; Barbieri, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1256819
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