fixed shutters meaning in English

固定百页窗

Shutter is easy to installation , including fixed shutter and removable shutter . it have various functions : aeration , sunshade , airtightness etc
详细内容：百叶窗安装方便，可分为活动百叶和固定百叶，能够实现通风、遮阳、密封等多功能。
Self - densifying high performance concrete is well - performing concrete with the good performance of fluidity , anti - segregation and filling - up - space . with its own gravity and without any vibration , it can automatically fill up the space in and between fixed shutters and form self - densified concrete structure of ideal dynamic property and durability , therefore , it can accelerate construction progress of a building , shorten the construction period , secure concrete quality and improve the building ' s durability . in the mean time , it is conducive as well for environment protection and effects remarkable social and economic efficiency
自密实混凝土属于高性能混凝土，它具有高流动性、高抗离析性、高填充性的性能，在自重作用下无需振捣，自行填充模板空间，形成自密实的混凝土结构，有良好的力学性能和耐久性能，可以加快工程建设进度、缩短工期、有效控制混凝土的质量、提高建筑物及构筑物的耐久性，并有利于环境保护，具有较高的社会和经济效益。