混凝土劣化与有害孔洞的物理关系

Physics relation between concrete deterioration and harmful pore

研究了混凝土性能劣化与冻胀损伤的关系,研究表明,混凝土性能劣化是混凝土力学性质因损伤所表现的衰减,混凝土性能劣化与冻胀损伤机理之间存在着一定的内在联系,这种联系具体反映在混凝土内部有害孔洞在冻胀过程中的发展.从物理形态的变化而言,有害孔洞尺寸与分布因冻胀而产生的改变将直接导致结构松散,而结构松散可以通过无损检测、抗压强度试验表现出来,由此结合细观孔结构试验,即可形成检测指标信号与细观孔洞结构变化之间的宏、细观对应关系,进而探讨细观孔洞结构的损伤变化对宏观性能的影响规律.最后得出结论:混凝土的宏观性能损伤与细观孔洞结构改变之间存在明显的对应关系.

The relationship between the deterioration of concrete and the damage of freez-thaw is studied. The deterioration of concrete performance showed that the mechanical property of concrete was faded down due to damage. On the basis of the above analysis, there existed some inherence relations between deterioration of concrete performance and damage mechanics of frost heave. These inherence relations were specifically reflected in the development process of harmful pore of concrete. According to the alteration, the change of size and distribution of harmful pore caused by frost heave would result in loosening of concrete structure. The loose of the structure could be checked out by nondestructive examination （NDE） and test of compression strength. In consideration of the combination with micro-test of pore structure, the inter-relationship between macro-measuring signal and the change of micro-pore structure would be created. The effect of the micro-pore structure damage on the macroperformance of concrete was discussed. The result showed that there existed significant relation between performance deterioration of concrete and the ehange of micro-pore structure.