dihydrate gypsum meaning in English

二水石膏

Standard practice for calculation of supersaturation of barium sulfate , strontium sulfate , and calcium sulfate dihydrate gypsum in brackish water , seawater , and brines
微咸水海水及盐水中硫酸钡硫酸锶和无水硫酸钙
The result shows , for this composite cement system , retarding action of dihydrate gypsum is more obvious than that of anhydrite , meanwhile , anhydrite tends to cause setting time short and water needed increased
结果表明：二水石膏对该种复合体系水泥的缓凝作用比硬石膏明显，硬石膏易引起复合体系水泥急凝和需水量增大。
The influence of different gypsum on strengh of portland - sulphoalminate composite cement system is complicated , related with aluminiferouse mineral in cement system and the so4 ( superscript 2 - ) concentration of its hydrated solution ; in distilled water and maximum lime wash , the dissolution rate of dihydrate gypsum is higher than that of anhydrite but the dissolubility is lower
石膏品种对硅酸盐硫铝酸盐复合体系水泥强度的影响较复杂，与水泥体系中含铝矿物及其水化溶液中so4 (上标2 - )离子浓度有关；在蒸馏水和饱和石灰水中，二水石膏的溶解速度比硬石膏快，溶解度比硬石膏低。