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

这项研究项目是由哥伦比亚大学的唐纳德·詹森和 华盛顿和魏玛大学的约亨·斯塔克。 本研究旨在 研究骨料混凝土对冻融循环的响应，以了解 为什么它们会失败，并识别容易受损的聚合物。 这种合作利用了外国和国内的互补专业知识， 不同的研究小组和不同的测试方法使比较测试成为可能。 的 德国的一个小组在测试混凝土抗盐垢方面有相当丰富的经验 微观结构评价。 这家美国集团拥有10年的经验， 研究D-开裂机理和敏感性。 合作的结果是 预计将包括改进识别易受霜冻影响的 集料，提高了对集料冻害机理的认识， 发展美国在使用替代试验程序方面的经验。

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.