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Alkali-activated refractory wastes exposed to high temperatures: development and characterization

BARTOLOMEO COPPOLA; TARDIVAT CAROLINE; RICHAUD STEPHANE; TULLIANI JEAN-MARC; MONTANARO LAURA; PALMERO PAOLA


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    "description": "<p>The feasibility to prepare alkali-activated materials starting from refractory wastes and their properties after exposure to high temperatures (800, 1000, 1200 and 1400\u202f&deg;C) were investigated. Two different aluminosilicate wastes were used: chamotte (CH, mainly composed of corundum, mullite and andalusite) and alumina-zirconia-silica (AZS, composed by baddeleyite, corundum and amorphous silica). Very high mechanical properties were achieved in both cases (28-days compressive strength of approx. 70 and 60\u202fMPa for CH- and AZS-based pastes, respectively). Then, alkali-activated pastes were exposed to high temperatures. For both kinds of samples, a sharp increase of mechanical properties was obtained after exposure to 800 and 1000\u202f&deg;C thanks to the matrix densification. Above 1000\u202f&deg;C viscous sintering occurs leading to a further increase of mechanical properties. AZS-based materials were able to withstand high temperatures up to 1400\u202f&deg;C while CH-based pastes mechanical properties decrease at 1400\u202f&deg;C due to andalusite decomposition.</p>", 
    "language": "eng", 
    "title": "Alkali-activated refractory wastes exposed to high temperatures: development and characterization", 
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    "keywords": [
      "Chamotte", 
      "AZS", 
      "Alkali-Activation", 
      "Refractory", 
      "High-Temperature"
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    "publication_date": "2020-06-24", 
    "creators": [
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        "affiliation": "POLITO", 
        "name": "BARTOLOMEO COPPOLA"
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        "affiliation": "SAINT-GOBAIN", 
        "name": "TARDIVAT CAROLINE"
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      {
        "affiliation": "SAINT-GOBAIN", 
        "name": "RICHAUD STEPHANE"
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      {
        "affiliation": "POLITO", 
        "name": "TULLIANI JEAN-MARC"
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      {
        "affiliation": "POLITO", 
        "name": "MONTANARO LAURA"
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