Gradient multi-setting cement slurry system can take the place of double stage cementing in long isolation sections in certain degree, and it displaces many advantages.
对于封固段较长的固井作业，采用梯度多凝水泥浆体系，在一定程度上可以代替双级固井，具有很强的优越性。
A quick-setting (flash-setting) cement and a no (?) mal-setting cement were systematically studied for the difference in petrographic structure of clinker, their hydration and hardening of cements.
着重观测了快(闪)凝与正常凝的水泥熟料的结构和水化过程的显著差别。
Effect of the above admixtures on strength of mortars and setting of cement paste were measured.
上述外加剂对砂浆强度和水泥凝结时间的影响也是本研究的部分内容。
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