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1)  ocrated concrete
四氟化硅混凝土
2)  silicon tetrafluoride
四氟化硅
1.
A patent for fluorosilicic acid production by adsorption of silicon tetrafluoride with pressure water is described in the production of wet-process phosphoric acid or phosphate fertilizer.
介绍一种在湿法磷酸或磷肥生产过程中用水吸收四氟化硅制备氟硅酸的专利技术。
3)  siliceous concrete
硅粉混凝土
1.
The reservoir has safely operated for12years since C 60 siliceous concrete used to line water release tunnel in1991and the abrasion in the base of tunnel has become decreased.
三屯河水库全年放水量中含沙量较大,水库放水隧洞在挟沙高速水流作用下,底部磨蚀严重,在采用几种材料衬护后都无法达到设计与安全运行,1991年采用C60硅粉混凝土对放水隧洞进行衬护,通过12a的运行,隧洞底部磨蚀量较小,运行可靠,达到设计要求,给水库安全防洪、排砂运行,保证灌溉带来了良好的经济效益。
4)  silica fume concrete
硅灰混凝土
1.
Influence of hybrid polypropylene fibers on chloride ion permeability of silica fume concrete;
聚丙烯纤维对硅灰混凝土氯离子渗透性能的影响
2.
As greeen material,silica fume concrete can economize cement and improve the environment,thus bringing about a healthy advance in concrete and architectural engineering.
硅灰混凝土为绿色混凝土 ,它不仅节约了水泥熟料 ,而且改善了环境 ,大大促进了混凝土和建筑工程的健康发展。
5)  silicon powder concrete
硅粉混凝土
1.
Application of shrinkage-compensating silicon powder concrete to Baishan Hydropower Station;
补偿收缩硅粉混凝土在白山水电站的应用
2.
Discussion on principle and requirement of choice of high-speed flow protecting surface material of silicon powder concrete;
由硅粉混凝土应用中存在的问题论高速水流护面材料选择的原则与要求
3.
Application of silicon powder concrete for flood discharge middle outlet in the Baojixia Reservoir Project;
硅粉混凝土在宝鸡峡水库泄洪中孔的应用
6)  silica fume concrete
硅粉混凝土
1.
The use of silica fume concrete can effectively improve the impermeability of concrete,frost resistance,Anti-abrasion and anti-corrosive.
北方水工混凝土普遍存在着混凝土冻融剥蚀问题,采用硅粉混凝土能有效提高混凝土的抗渗性、抗冻性、抗冲磨性和抗侵蚀性,无毒便于施工,成本较低,是大面积混凝土剥蚀破坏表面的首选修补材料。
2.
Combining with concrete project example,the author studies the preparation of silica fume concrete and silica fume fly ash concrete based on experiment,and analyzes and compares their economy,gets the conclusion that the silica fume fly ash concrete has higher collapsed slump than silica fume concrete,and has better project economy and applicability.
结合具体的工程实例,通过试验对硅粉混凝土和硅粉粉煤灰混凝土的制备进行了研究,并对二者的经济性作了分析比较,得出硅粉粉煤灰混凝土较硅粉混凝土的坍落度高,且工程经济性与适用性强的结论。
补充资料:四氟化硅
      化学式SiF4。无色有毒气体;熔点-90.2℃(1.73大气压),密度4.69克/升,固体SiF4在-95.5℃升华。四氟化硅在湿空气中因水解而产生烟雾。在冷冻下加压可凝成无色液体。四氟化硅较稳定,干燥时不腐蚀玻璃;潮湿时水解成硅酸凝胶和氢氟酸:
  SiF4+4H2O─→H4SiO4+4HF氢氟酸能腐蚀玻璃,也能与四氟化硅结合成六氟硅酸:
  SiF4+2HF─→H2SiF6四氟化硅也易被碱溶液分解:
  
    
  
  四氟化硅可由单质之间反应制得:
  Si+2F2─→SiF4也可由石英与氢氟酸反应,或由萤石粉和石英砂的混合物与浓硫酸作用来制得:
  SiO2+4HF─→SiF4+2H2O
  
  
  将氟硅酸盐热分解可得纯四氟化硅:
  
  
  

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