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首页> 外文会议>Workshop on Cement and Concrete - Trends and Challenges; 20011107-20011109; Anna Maria Island,FL; US >FUTURE GOALS OF CEMENT AND CEMENTITIOUS MATERIALS FOR HIGH PERFORMANCE CONCRETE
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FUTURE GOALS OF CEMENT AND CEMENTITIOUS MATERIALS FOR HIGH PERFORMANCE CONCRETE

机译：高性能混凝土的水泥和胶凝材料的未来目标

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摘要

The Florida Department of Transportation (FDOT) has developed concrete and concrete materials related specifications and guidelines with the intention that they provide maximum durability and protection to the Department's bridge and roadway structures. These protective measures include the environmental classifications of roadway and bridge sites, use of concrete in accordance with its environmental conditions, minimum concrete cover, maximum allowable chloride content, use of pozzolanic materials, blast furnace slag, and corrosion inhibitors. Special mixes are used and special measures are taken to provide the required plastic and mechanical properties especially in hot weather concrete, flowing concrete admixtures and self-leveling concrete. The uses of environmentally safe and locally available materials (such as petroleum coke fly ash, bark ash, Class F fly ash, silica fume, calcium nitrate, ground granulated blast furnace slag, and metakaolin) are allowed as an ingredient in the concrete when proven to provide the required durability and strength. The future concrete related aim and mission of the FDOT are the optimization of concrete material ingredients with their required performance. The development of performance-based specifications and criteria are needed. A thorough study of the modulus of elasticity, creep, shrinkage, and other concrete properties for locally available materials should be studied. The use of nondestructive testing for field performance evaluation should be increased with the intent of utilizing this equipment for acceptance of the concrete. The precast/prestressed concrete, drainage products and ready-mixed concrete plants should meet the requirements of national standards as eligibility requirements for providing concrete or concrete materials to FDOT projects. The FDOT, suppliers, and manufacturers of concrete materials, as well as academic research centers, need to work together to accomplish the future concrete related aim and mission of the State of Florida.
机译：佛罗里达州交通运输部（FDOT）已制定了与混凝土和混凝土材料相关的规范和指南，旨在为该部门的桥梁和道路结构提供最大的耐久性和保护。这些保护措施包括：巷道和桥梁工地的环境分类，根据其环境条件使用混凝土，最小混凝土覆盖率，最大允许氯含量，使用火山灰材料，高炉矿渣和腐蚀抑制剂。使用特殊的混合物，并采取特殊的措施以提供所需的塑性和机械性能，特别是在炎热天气混凝土，流动混凝土外加剂和自流平混凝土中。经证实，允许使用环境安全且本地可用的材料（例如石油焦粉煤灰，树皮灰，F级粉煤灰，硅粉，硝酸钙，磨碎的高炉矿渣和偏高岭土）作为成分在混凝土中使用提供所需的耐用性和强度。 FDOT未来与混凝土相关的目标和任务是优化混凝土材料成分及其所需的性能。需要制定基于性能的规范和标准。应该对本地可用材料的弹性模量，蠕变，收缩和其他混凝土性能进行彻底研究。应当增加使用非破坏性测试进行现场性能评估的目的，以利用该设备来验收混凝土。预制/预应力混凝土，排水产品和预拌混凝土工厂应符合国家标准的要求，作为为FDOT项目提供混凝土或混凝土材料的资格要求。 FDOT，混凝土材料的供应商和制造商以及学术研究中心需要共同努力，以实现佛罗里达州未来与混凝土相关的目标和使命。

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