These are the main portland cements, but variations of them are mentioned in the article on concrete additives . 这些就是主要的波特兰水泥，在“混凝土外加剂”课文中还提到了其他品种的波特兰水泥。
The cements the romans used were different from ours though concrete can be made of any strong lime or cement . 虽然混凝土可以用任何高强度的石灰或水泥来制作，但是罗马人所用的水泥不同于我们所用的水泥。
The statue of general jackson stands on its pedestal and looks with calculation at the cannon balls pyramided in cement . 杰克逊将军的雕象仍然高高屹立在石座上，以一副深谋远虑的神态望着脚下的一堆水泥炮弹。
As a rough guide it can be generally stated that for each 1p spent on an admixture then approximately 4-5p worth of cement can be saved . 作一个粗略的估计，一般说耗用每一磅外加剂，能节省约4-5磅水泥的价值。
By maintaining workability, but at a lower water content, concrete strength may be increased without the need for further cement addition . 保持工作度不变，在低用水量时，不必增加水泥用量，混凝土的强度也能增加。
He led the way down a flight of cement stairs to the basement workroom with its usual clutter of explosives and accessories . 他领着路，走了一段水泥楼梯到了地下工作室。那里象往常一样乱糟糟地堆着炸药和各种配件。
It buys more typewriters and more cement, meets a bigger payroll, and handles more money than any other organization anywhere . 和任何地方的组织单位相比，它购买更多的打字机和水泥，支付更多的薪金和经手更多的款项。
Methods of testing cement - determination of fineness 水泥的试验方法.细度的测定
