中文摘要：

研究了在不同水化学环境下砂浆试样力学特性劣化及其微细观结构损伤的演化,并探讨其力学特性劣化的细观机制。结果表明,化学腐蚀后试样峰值前的塑性变形有所增大。溶液对试样的化学腐蚀作用越强其塑性变形越大,并具有明显的时间阶段性。腐蚀后试样塑性变形的变化,间接地反映了化学溶液对砂浆试样的腐蚀程度。提出无损量测方法计算不同腐蚀时间段内砂浆试样的孔隙率,并基于其孔隙率的变化建立了新的损伤变量。研究发现,砂浆试样的化学损伤程度与其物理力学参数之间的一致性比较明显。这说明,用基于化学腐蚀产生的次生孔隙率建立的损伤变量定量描述试样微细观结构的化学损伤程度及其物理力学特性随化学损伤的演化过程,是合理的。

英文摘要：

The meso-structure evolution of mortar may certainly induce a significant effect on its macroscopic mechanical properties. Herewith, the mechanism concerning the mechanical property degra- dation and the evolution of corrosion induced meso-structure damages of mortar were studied after im- mersion in different salt solutions. The experimental results show that after corrosion in salt solutions, the plastic deformation of mortar increased; and the stronger is the corrosion attack, the larger is the plastic deformation of the mortar; however which is an obvious time dependent process. Thus the degree of plastic deformation may be a reflection of the corrosion degree of mortar. A method based on nondestruc- tive inspection was proposed to predict the variation of mortar porosity versus corrosion time, and then a new parameter for describing the damages was proposed. The present study revealed that after immer- sion in salt solutions the corrosion attack induced damage degree of mortar is closely related to its physi- cal and mechanical parameters, which proves that the proposed method for quantitative analysis of the evolution of meso-structure damages is reasonable.