(四)和易性问题混凝土最终的强度和耐久性,在很大程度上决定于混凝土凝固前,也就是新拌混凝土的一系列性能。只有当混凝土还处于可塑状态时,经过最经济有效的工序,也就是消耗最少的能量,就能使新拌混凝土在运输、浇灌过程中得到不出现分层离析的最密实的混合物,才能保证硬化后具有满意的强度和耐久性。 (IV) Workability The ultimate strength and durability of concrete depends to a large extent on a series of properties of concrete before it is solidified. Only when the concrete is still in the plastic state, after the most economical and efficient process, that is, the least energy consumption, the freshest concrete can get the densest mixture without stratification and segregation in the process of transportation and pouring to ensure the hardening. After having satisfactory strength and durability.