Application of Microtomography to Fracture Processes in Cement-Based Materials

9523019 Shah这是缅因州大学和西北大学之间的一个联合研究项目。 研究的目的是观察单轴压缩下水泥和砂浆小试件内部微裂纹的三维扩展。 将使用同步加速器X射线显微断层扫描结合三维图像分析技术测量微裂纹。 这项研究工作代表了第一次定量测量水泥基材料的内部开裂已经有可能在微米分辨率。 更清楚地了解断裂机制对于开发更坚固和更坚韧的材料至关重要。 最近，使用亚微米毫米范围内的微细颗粒填充的概念，已经开发出抗压强度高达800 MPa的混凝土。 研究粒度分布（活性和非活性颗粒）对断裂韧性的影响。

9523019 Shah This is a joint research project between University of Maine and Northwestern University. The objective of the research is to observe the three dimensional growth of internal microcracks in small cement and mortar specimens loaded in uniaxial compression. The microcracking will be measured using synchrotron x-ray microtomography combined with a 3-D image analysis technique. The research work represents the first time that quantitative measurements of internal cracking of cement-based materials have been possible at micron resolution. A clearer understanding of fracture mechanisms are critical for the development of materials which are both stronger and tougher. Recently, using the concepts of microfine particle packing in the range of submicron millimeter, concrete with a compressive strength of up to 800 MPa has been developed. The influence of particle size distribution (reactive and non-reactive particles) on fracture toughness is to be investigated.