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).

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研究了当水泥中混入隔热防水粉后 ，隔热防水粉对水泥标准稠度用水量、凝结时间及体积安定性的影响 。

The effect of the amount of water needed under the cements normal consistency, setting time and volume stability were investigated when heat insulation and waterproofing powder was added in cement.

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本标准规定了水泥标准稠度用水量、凝结时间和由游离氧化钙造成的体积安定性的检验方法。

This standard specified the testing methods of water requirement of normal consistency, setting time as well as soundness of portland cements caused by free calcium oxide.

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本标准规定了水泥标准稠度用水量、凝结时间和由游离氧化钙造成的体积安定性的检验方法。

This standard specified the testing methods of water requirement of normal consistency, setting time as well as soundness of portland cements caused by free calcium oxide.

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