U.S.-Germany Cooperative Research: Investigation on NaturalStones for Use as Aggregates in Concretes with High Resistance Against Freeze-Thaw Attack

这项研究项目是华盛顿大学的唐纳德·扬森和魏玛大学的约亨·斯塔克合作完成的。这项研究的目的是研究骨料混凝土对冻融循环的响应，以了解它们失效的原因，并确定容易损坏的骨料。合作借鉴了国内外研究小组的互补专业知识，不同的测试方法使对比测试成为可能。这家德国集团在混凝土抗盐垢测试和微观结构评估方面拥有丰富的经验。这家美国集团在研究D-裂化机制和敏感性方面拥有10年的经验。预计合作的结果将包括改进对霜冻敏感集料的识别，提高对集料中霜冻损害机制的理解，以及发展美国在使用替代测试程序方面的经验。

This research project is a collaboration between Donald Janssen of the University of Washington and Jochen Stark of the University of Weimar. The purpose of the research is to study the response of aggregate concretes to freeze-thaw cycles in order to understand why they fail and to identify aggregates that are susceptible to damage. The collaboration draws on the complementary expertise of the foreign and domestic research groups, and the different testing methods make comparison testing possible. The German group has considerable experience in testing concrete for resistance to salt scaling and the microstructural evaluation. The U.S. group has 10 years of experience investigating D-cracking mechanisms and susceptibility. Results of the collaboration are expected to include development of improved identification of frost-susceptible aggregates, improved understanding of the frost damage mechanism in aggregates, and the development of U.S. experience in the use of alternate testing procedures.