论文部分内容阅读
美国国家标准与技术研究院（ＮＩＳＴ）正在进行名为“高性能混凝土之友（ＰＨＰＣＴ）”的合作研究项目，其目的是促进混凝土技术发展，推动高性能混凝土（ＨＰＣ）在建筑物和基础构筑物中的应用． 项目的目标是结合业已确认的多属性模型，开发和应用一种计算机集成知识系统（ＣＩＫＳ），来预测和优化ＨＰＣ的性能及寿命周期预算． 我们的基本假设是：最实际有效地将知识传授给混凝土新技术的潜在用户（ 或者说考虑使用的用户） 的方法，就是使混凝土材料科学通过可互联操作的ＣＩＫＳ（含数据库、仿真模型和知识基系统）与实践相结合． 本文将叙述ＰＨＰＣＴ 项目的主要内容，包括新材料的工艺制备过程、材料的特性描述、性能预测、结构行为、在火中的结构行为以及寿命周期预算． 所有这些知识都将集成在取名为ＨＹＰＥＲＣＯＮ 的ＣＩＫＳ中． 文中还将举例说明ＮＩＳＴ过去已进行的和目前正在进行的与ＨＰＣ 有关的研究工作，重点是水泥特性描述、新拌混凝土的流动性能、微结构发展及传质现象的模拟、剪切行为、高强混凝土对火的反应，以及新材料的寿命周期预算．
The National Institute of Standards and Technology (NIST) is conducting a collaborative research project called “Friends of High-Performance Concrete for Concrete (PHPCT)” that aims to promote the development of concrete technology and promote the use of high performance concrete (HPC) in buildings and foundation structures. In the application. The goal of the project is to develop and apply a computer-integrated knowledge system (CIKS) to predict and optimize HPC performance and life cycle budgets in conjunction with established multi-attribute models. Our basic assumption is that the most practical and effective way to transfer knowledge to potential users of new concrete technologies (or users who are thinking about using them) is to make the concrete materials science pass through interconnected CIKS (including databases, simulation models, and knowledge). (base system) combined with practice. This article will describe the main contents of the PHPCT project, including the process preparation of the new material, the characterization of the material, the performance prediction, the structural behavior, the structural behavior in the fire, and the life cycle budget. All this knowledge will be integrated in the CIKS named HYPER-CON. The paper will also illustrate the research work of NIST that has been conducted in the past and is currently under way, focusing on the description of cement properties, flow properties of fresh concrete, microstructure development, and simulation of mass transfer phenomena, shear behavior, and high strength. The reaction of concrete to fire, and the life cycle budget of new materials.