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.

发产生膨胀的钙矾石是由局部学反所生成；它们在未水的铝酸盐矿物表面原地结晶，呈放射状生长。

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

粉煤的火山对水产物钙矾石的形貌和性会产生影响。