The poozzolanic effect of fly ash on shape looks and function of the Calcium aluminite,Which is the cement hydrated product,is also introduced.

粉煤灰火山灰效应对水化产物矾石形能会产生影响。

It is shown that expansible ettringite forms in the topochemical reaction,and crystallizes in-situ on the surface of unhydrated aluminate minerals and orients radially.

现能够产生膨矾石是由局部化学反应所生成；它们在未水化铝酸盐矿物表面原地结晶，呈放射状生长。