In this paper, the study of concrete is hierarchically classified into four levels, viz macroscopic, mesoscopic, microscopic and nasoscopic level. The research approach and applied fields of four levels are apprehensively reviewed.

• 把对混凝土断裂问题的研究分为宏观、细观、微观和纳观 4个层次 ；综述了不同层次的研究方法及适用对象 .