Application of Microtomography to Fracture Processes in Cement-Based Materials

9523019 Shah 这是缅因大学和西北大学的联合研究项目。 该研究的目的是观察单轴压缩加载的小型水泥和砂浆样本中内部微裂纹的三维生长。 将使用同步加速器 X 射线显微断层扫描结合 3D 图像分析技术来测量微裂纹。 这项研究工作首次以微米分辨率定量测量水泥基材料的内部裂纹。 更清楚地了解断裂机制对于开发更强韧的材料至关重要。 最近，利用亚微米毫米范围内的超细颗粒填充的概念，开发出了抗压强度高达800 MPa的混凝土。 有待研究粒度分布（反应性和非反应性颗粒）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.