关键词: 水泥混凝土, 临界损伤, 裂纹演化, 密度, 标度, 几何自相似, 重正化

Abstract: The conditions and featwres of critical damage are firstly investigated for cement concrete in this paper.Futher,the renormalixation group model and stationary point equation are established. With the aid of normal treatment of damage,the area density of critical damage is obtained,which coincides with exporienccd values. The results have practicaI mean-ing to damage mechan ics an alyses of cement concrete and other brittle materials.

Key words: cement concrete, critical damage, crack evalution, density, scale, geometrical self-similarity, renormalixation