水泥添加剂用来改变水泥的密度、凝固时间、抗压强度、流动性能和脱水率，并用来使水泥膨胀以及降低水泥成本。

Cement additives are used to change the cement's density, setting time, compressive strength, flow properties and dehydration rate, to cause the cement to expand, and to reduce the cost of the cement.

youdao

同时调整碳硅含量，可有效地改变灰铸铁凝固转变过程的体积收缩和膨胀特性。

By changing the carbon and silicon in a proper way at the same time, the volume expansion or shrinkage feature in the cast iron solidification can be significantly changed.

youdao

利用球墨铸铁凝固过程中的石墨化膨胀，进行自身补缩，可以实现少胃口或无冒口铸造。

The self-compensated contraction caused by graphite dilatation in the solidification process of nodular cast iron makes casting with less flow-off or casting without flow-off possible.

youdao