求翻译：5.用做水泥掺合剂：水泥中添加一定数量的葡萄糖酸钠后，可增加混凝土的可塑性和强度，且有阻滞作用，即推迟混凝土的最初与最终凝固时间是什么意思？

5 used as cement admixture agent: add a certain amount of cement in the sodium gluconate, the increase of the plasticity and strength of concrete, and there is blocking, which delayed the initial and final concrete setting time

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5. uses to make the cement additive: In after the cement increases certain quantity the sodium gluconate, may increase the concrete the plasticity and the intensity, also has the retardation, namely the postpone concrete at first and finally coagulates the time

5 them. used as cement additive: cement added certain number of sodium gluconate to increase plasticity of concrete and strength and blocking effect, delay the initial concrete with end time

5. used as cement additive: after adding a certain amount of sodium gluconate in the cement to increase plasticity and strength of concrete, and the blocking effect, that is, postpone initial and final solidification of concrete