Predictive tools for improving and controlling the quality and durabilty of concrete

混凝土技术的新发展导致了土木工程应用中使用的混凝土类型以及性能要求的变化。新型水泥和新型矿物和化学外加剂的使用导致高性能混凝土（HPC）和自固结混凝土（SCC）的发展。HPC和SCC具有高强度、高弹性模量、少出血、少蠕变和高耐久性等优点。例如，SCC是一种高流动性的混凝土，它可以很容易地扩散，并且在自身重量下自固结而不会离析。更严格的性能要求，主要是耐久性，也被强加在这些混凝土上，以确保寿命。目前，还没有标准的测试方法来保证新拌混凝土的质量及其符合耐久性和其他结构要求。

New developments in concrete technology have resulted in changes in the types of concrete used in civil engineering applications as well as the performance requirements. Use of new cements and new mineral and chemical admixtures have led to the development of high performance concrete (HPC) and self-consolidating concrete (SCC). HPC and SCC present numerous advantages such as high strength, high elastic modulus, less bleeding, less creep, and high durability. For example SCC is a highly flowable concrete that can spread easily and self consolidate under its own weight without segregation. Stricter performance requirements, mainly durability, have also been imposed on these concrete to ensure longevity. At present, standard test methods have not been developed to ensure quality of the fresh concrete and its compliance with the durability and other structural requirements.