Danish Great Belt;
    Marine environment is a concrete finds itself one of the most severe environmental conditions, concrete structures need to withstand high mechanical strength and man-made force requirements, structure, easy-to-failure, while the concrete structure used in this environment will be subjected to freezing, storms, and water and other natural factors, the role of concrete subjected to injury tends to shorten its durable life. The existing ordinary concrete structure in this environment, the mechanical performance and durability problems have become increasingly acute, and thus had to spend a huge cost to its annual maintenance, this problem caused widespread concern around the world engineering.

     Danish Great Belt project was first proposed by service life of 100 years, that is ensure that their mechanical properties also provides reinforcement in a hundred years during the period shall not commence Shou rust. To this end, a large number of thematic studies carried out in advance to provide concrete strict technical standards, by providing for a certain amount of silica fume admixture (silica fume) and fly ash concrete to ensure a low permeability; gas and air bubbles by means of quality control assurance the frost resistance; through the silica fume admixture (silica fume) to ensure abrasion resistance (anti-ice red mill); by restricting the activity of aggregate content, alkali limit on the total amount of silica fume admixture (silica fume) and of fly ash to prevent the alkali-aggregate reaction; Sodium Sulfate - the use of sulphate resisting cement and silica fume admixture (silica fume) assurance; through the use of low-heat cement, micro silica fume admixture (silica fume) and fly ash to reduce hydration heat, pouring of concrete used on the internal temperature control of thermal stress cracks.

    The initial density of micro-silica powder is generally 150-200 kg/m3, transport efficiency is low, not long-distance transport. Encrypted
After treatment, the density can be increased to 500-750 kg/m3. Encrypted micro-silica structure and morphology of the original state of dense micro-silica powder is basically the same, encryption is not caused by micro-morphological changes of silica particles, their particle size distribution is still 10 ~ 100nm between the surface area of silica fume remains unchanged; the same time, encrypted micro-silica powder loading and unloading efficiency, reduce storage space and an area, easy pumping, a high degree of mechanization is suitable for automatic production, on-site feeding no longer appears the phenomenon of fly ash, thus improving the working conditions.

    The concrete production process, the use of encryption is more conducive to micro-silica powder Stir well to improve overall performance of concrete and thus encrypted micro-silica fume in concrete and other building materials is becoming increasingly popular product applications.

   大凌河流域属温带季风气候，夏季多雨炎热、空气湿润，冬春少雨，气候干燥，是辽宁省干旱地区之一，有“十年九旱”之称。流域内多年平均降雨量为430—630毫米，降水量年际变化较大，年内分配极不均匀，多集中在7、8月份。多年平均蒸发量一般在1800—2300毫米。多年平均径流量为16.40亿立方米，最大年径流量为35.80亿立方米，最小年径流量3.40亿立方米，7—9月份径流量约占全年的60%。

    白石水库在建设过程中，注意摆脱旧观念的束缚，尽可能采用国际国内先进技术和先进管理方式。对工程的总体布置做到科学规划，布局合理，功能综合化。在水库的基础设施建设方面既满足建设需要，又要适应今后长远发展的要求；在工程实施过程中，坚持按国际工程管理，增加科技含量，广泛采用新材料、新工艺、新技术。比如在施工技术上，对碾压混凝土采用RCD施工工法、RCC混凝土配合比。既保持了RCD混凝土良好层间结合和防渗性能的优点，同时兼有了RCC混凝土高掺粉煤灰、减少水泥用量、降低水化热的优点，从而发展了RCD工法。特别是泄洪排沙底孔全过程仿计算及抗冲材料的研究与应用。底孔全过程方针配筋设计和微硅粉(silica fume)混凝土抗冲磨材料在水利工程上应用达到国内领先水平。这在国际上也是一个重大突破。实践证明，在工程建设中坚持高起点，按现代化的标准，运用现代化的技术，实行现代化管理，是建设一个现代化工程的必要条件。

  下列标准包含的条文，通过在本标准中引用而构成为本标准的条文。本标准出版时，所示版本均为有效。所有标准都会被修订，使用本标准的各方应探讨使用下列标准最新版本的可能性。

GB 175-92 硅酸盐水泥、普通硅酸盐水泥

GB/T 196-1996 水泥化学分析方法

GB 177-85 水泥胶砂强度检验方法

GB/T 203-94 用于水泥中的粒化高炉矿渣

GB 1345-91 水泥细度检验方法（80μm筛筛析法）

GB 1346-89 水泥标准稠度用水量、凝结时间、安定性检验方法

GB 1596-91 用于水泥和混凝土中的粉煤灰

GB/T 2419-94 水泥胶砂流动度测定方法

GB/T 2847-1996 用于水泥中的火山灰质混合材料

GB/T 5483-1996 石膏和硬石膏

GB 6645-86 用于水泥中的粒化电炉磷渣

GB 9774-1996 水泥包装袋

GB 12573-90 水泥取样方法

GB 12958-91 复合硅酸盐水泥

JC/T 417-91（96） 用于水泥中的粒化铬铁渣

JC/T 418-91（96） 用于水泥中的粒化高炉钛矿渣

JC/T 454-92（96） 用于水泥中的粒化增钙液态渣

JC/T 722-82（96） 水泥物理检验仪器 胶砂搅拌机

JC/T 742-84（96） 掺入水泥中的回转窑窑灰

YB/T 022-92 用于水泥中的钢渣<silica fume>

  In order to improve the strength of concrete test blocks, technicians often use to increase usage of cement and silica fume approach. Some of the additives used in construction, while the test block did not add admixtures. Such as micro-foam agent reduces the use of mortar strength, and in the test block do not join the micro-foam agents, the actual construction for the convenience of the majority of the construction plus micro-foam agent. Therefore, with the test block is not the entity than the mix of construction projects, resulting in some super-test block up to 100%.