Journal article Open Access

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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{
  "DOI": "10.1016/j.jeurceramsoc.2020.02.052", 
  "language": "eng", 
  "author": [
    {
      "family": "BARTOLOMEO COPPOLA"
    }, 
    {
      "family": "TARDIVAT CAROLINE"
    }, 
    {
      "family": "RICHAUD STEPHANE"
    }, 
    {
      "family": "TULLIANI JEAN-MARC"
    }, 
    {
      "family": "MONTANARO LAURA"
    }, 
    {
      "family": "PALMERO PAOLA"
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2020, 
        6, 
        24
      ]
    ]
  }, 
  "abstract": "<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>", 
  "title": "Alkali-activated refractory wastes exposed to high temperatures: development and characterization", 
  "type": "article-journal", 
  "id": "3906070"
}
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