所用材料不合格。如砂、石、集料质量不合格；除此之外，大多数是因为水泥体积膨胀率太大(安定性严重不良)。
USES material not qualified. Such as sand, stone, aggregate quality unqualified; In addition, mostly because cement volume expansion rate is too large (stability serious adverse).
它作为水泥混合材料可以改善水泥的安定性，并能降低水泥的成本。
Used as cement admixture it can improve the soundness of cement and reduce the cost.
石灰石中经常含有少量的氧化镁，这对水泥的安定性有害。
Limestone often contains small amount of magnesium oxide that is harmful to soundness of cement.
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