| 摘要 |
A hydraulic cement mix including a Portland type cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising an alkali or alkaline earth fluotitanate, wherein the additive is present in an amount sufficient to retard beneficially the setting and hardening of the mix. The additive is preferably selected from the group comprising calcium, potassium and sodium fluotitanate and is present in an amount of between about 0.005% by weight and 1.0% by weight based upon the weight of the cement.
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