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单词 pozzolan
释义
pozzolan

Geology and Earth Sciences
  • Originally, a tuff found near Pozzuoli, in southern Italy, that was used in mortars in Roman times. Today the most widely used pozzolan is pulverized fly ash. A pozzolan is any substance containing silicic acid (H4SiO4) that has the properties of a cement when mixed with calcium hydroxide (Ca(OH)2). The cement is a calcium silicate hydroxide (CaH2SiO4.2H2O):

    Ca(OH)2+H4SiO4Ca2++H2SiO4+2H2OCaH2SiO4.2H2O


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