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

粉煤灰的火山灰效应对水化产物钙矾石的形貌和性会产。

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.

产膨胀的钙矾石是由局部化学反应所成；它们在未水化的铝酸盐矿物表面原地结晶，呈放射状长。