U.S.-Germany Cooperative Research on Strain Softening Response of High Strength Concrete

该奖项支持NSF科学的成员 先进水泥基材料技术中心 西北大学的材料，由 Surendra P. Shah教授，与 土木工程系成员 达姆施塔特，德国， 导演：Gert Koenig 他们是 联合他们的资源和专业知识， 实验研究，以确定因素 影响的应变软化响应 单轴压缩和拉伸的混凝土。 该研究计划结合了TH的专业知识 达姆施塔特的大型结构测试和 运用材料科学知识进行设计 正在高级研究中心 水泥基材料。 混凝土技术的最新进展 可以使混凝土具有抗压强度， 强度是正常的两倍多 强度混凝土 这种高强度混凝土 在当前的建筑中被越来越多地使用， 由于感知到的有益特性， 但越来越多的证据表明 在某些情况下使用不当。 增加的 强度部分归因于改进的结合 水泥基基质和骨料之间的 混凝土 然而，这种改进的结合使得 高强混凝土比普通混凝土更脆 混凝土 故障机制不佳 明白 不同的失效机制导致 在不同的应变软化响应。 一 更好地理解应变软化 响应将有助于确定适当的使用 这种新材料。

This award supports members of the NSF Science and Technology Center for Advanced Cement-Based Materials at Northwestern University, headed by Professor Surendra P. Shah, to collaborate with members of the Department of Civil Engineering of the Technische Hochschule Darmstadt, Germany, directed by Professor Gert Koenig. They are joining their resources and expertise in experimental research to determine the factors that influence the strain softening response of concrete in uniaxial compression and tension. The research plan combines the expertise of TH Darmstadt in large-scale structural testing and design with the knowledge of materials science being developed at the Center for Advanced Cement-Based Materials. Recent advances in concrete technology have made it possible to make concrete with compressive strength more than double that of normal strength concrete. This high strength concrete is used more and more in current construction, because of perceived beneficial characteristics, but there is growing evidence that it is being used improperly in some cases. The increased strength is due in part to an improved bond between the cement-based matrix and aggregate in concrete. However this improved bond makes the high strength concrete more brittle than normal concrete. The failure mechanisms are poorly understood. Different failure mechanisms result in different strain softening response. A better understanding of the strain softening response will help to define the appropriate use of this new material.