US-Algeria Cooperative Research: Limestone Concrete Durability Research

0138306soboyejo描述：该奖项旨在支持由新泽西州普林斯顿大学机械与航空航天工程系Winston Soboyejo博士、俄亥俄州立大学航空航天工程系Alfred Soboyejo博士和阿尔及利亚Blida大学土木工程系Said Kenai博士合作开展的一个项目。研究将集中在发展石灰石含量对石灰石胶结物断裂和疲劳行为影响的基本认识。石灰石混凝土的制造及其基本特性（成分、结构、强度和渗透性）的表征将在阿尔及利亚完成。电子显微镜和x射线衍射技术将用于进一步表征普林斯顿大学和国家标准与技术研究所（NIST）的胶凝材料的结构。断裂行为研究将在普林斯顿大学进行，包括裂纹-微观结构相互作用和与阻力曲线行为相关的过程区发展。然后对电阻曲线实验和疲劳裂纹扩展过程中观察到的裂纹尖端屏蔽机制进行建模。研究了相对湿度和温度对疲劳裂纹扩展的影响，并建立了模型。在该项目的最后一年，将在阿尔及利亚举办一个关于石灰石水泥耐久性的美国-阿尔及利亚研讨会，向来自阿尔及利亚和美国的研究生、工业代表和研究人员介绍石灰石水泥混凝土的最新概念。范围：该项目涉及的问题对大多数发展中国家都具有重要价值，对美国也具有重要意义。石灰石水泥比现有水泥便宜得多，生产起来也更环保。该项目将研究这些材料作为静态和动态载荷的结构水泥的价值。石灰石在阿尔及利亚和大多数中东国家都很容易获得，如果它可以用于水泥，将有助于为不断增长的人口增加住房供应。在美国，这种材料如果被证明是成功的，将有助于减少生产水泥对环境的影响。该项目将启动美国与阿尔及利亚在科学技术领域的合作。一名来自普林斯顿大学的美国研究生将参与阿尔及利亚的这个项目。该提案符合INT在共同科学兴趣领域支持合作研究的目标。

0138306SoboyejoDescription: This award is to support a collaborative project by Dr. Winston Soboyejo, Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey, Dr. Alfred Soboyejo, Department of Aerospace Engineering, The Ohio State University and Dr. Said Kenai, Department of Civil Engineering, University of Blida, Blida, Algeria. The research will focus on developing a basic understanding of the effects of limestone content on the fracture and fatigue behavior of limestone cements. The manufacture of limestone concrete and the characterization of their basic properties (composition, structure, strength and permeability) will be done in Algeria. Electron microscopy and x-ray diffraction techniques will be used to further characterize the structure of the cementious materials at Princeton University and at the National Institute of Standards and Technology (NIST). Fracture behavior studies will be carried at Princeton University, including the crack-microstructure interactions and the process zone development associated with resistance-curve behavior. The crack-tip shielding mechanisms observed during the resistance-curve experiments and fatigue crack growth will then be modeled. The effect of relative humidity and temperature on fatigue crack growth will be investigated, and will be modeled. A U.S.-Algeria workshop on the durability of limestone cements will be held in Algeria during the final year of the program, to introduce state-of-the-art concepts on limestone cement concrete to graduate students, industrial representatives and researchers from Algeria and the U.S.Scope: This project deals with a problem of significant value to most developing countries and also of significance to the United States. Limestone cements are considerably less expensive and more environmentally friendly to produce than existing cements. The project will investigate the value of these materials as structural cement for static and dynamic loads. Limestone is readily available in Algeria and most Middle East countries and if it can be used in cements would help increase housing availability to the growing populations. In the U.S. such materials, if proven successful, would help reduce the environmental impact of producing cement. The project will initiate a US-Algeria collaboration in the area of science and technology. One US graduate student from the Princeton University will participate in the project in Algeria. This proposal meets the INT objective of supporting collaborative research in areas of mutual scientific interest.