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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。
The mechanical property deterioration and microstructure damage evolution of mortar samples under different water chemistry environments were studied, and the meso-mechanism of mechanical properties deterioration was discussed. The results show that the plastic deformation of the sample before the chemical corrosion has increased. The greater the chemical corrosion effect of the solution on the sample, the greater the plastic deformation and the obvious time-stage. The change of the plastic deformation of the sample after the corrosion indirectly reflects the corrosion degree of the chemical solution on the sample of the mortar. Proposed a nondestructive measurement method to calculate the porosity of mortar sample in different corrosion time period, and established a new damage variable based on the change of porosity. The study found that the consistency between the degree of chemical damage of mortar samples and their physical and mechanical parameters is obvious. This shows that it is reasonable to quantitatively describe the degree of chemical damage and its physical and mechanical properties of the microstructure of the sample as a function of chemical damage by using the damage variable established based on the secondary porosity generated by chemical etching.