化学环境对灰岩力学性能影响的纳米压痕试验研究

doi:10.13722/j.cnki.jrme.2021.0882

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Abstract In order to explore the change law and meso-mechanism of the mechanical properties of concrete in chemical environments such as saline soil. Limestone，which is commonly used as a coarse aggregate for concrete in Northwestern China，is used as the research object. The chemical corrosion tests of limestone immersed in CaCl2 solution and Na2SO4 solution with pH = 2，5，7，9，12 were carried out. Nanoindentation mechanics test and scanning electron microscope observation technology are used to carry out the micromechanical test research of limestone under chemical solution erosion. The results of the study indicate：After chemical corrosion，the elastic modulus and hardness of the limestone samples are reduced to varying degrees. The limestone sample shows a certain timeliness. The corrosiveness of limestone samples is CaCl2 solution＞Na2SO4 solution. At the same time，the degree of influence on the limestone sample is acidic environment＞alkaline environment. The changes of pH and ion concentration in the solution are closely related to the damage of the sample. It shows that the higher the pH and the higher the ion concentration，the lower the mechanical parameters of the sample. Limestone is most sensitive to the pH of the solution. The main effects on the chemical corrosion of limestone are H+ and OH－ in the solution. Finally，a new damage variable defined by elastic modulus is introduced to describe the degradation degree of the mechanical properties of limestone after chemical damage At the same time，the relationship between damage variables of limestone and other mechanical parameters is analyzed. The study found that the damage variable is closely related to the hardness. The smaller the hardness，the greater the decrease in mechanical parameters.

Key words： rock mechanics limestone chemical etching nano indentation test meso-mechanical properties

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	Articles by authors
	DANG Faning
	GAO Tianqing
	YUAN Shijing
	LEI Man

Cite this article:

DANG Faning,GAO Tianqing,YUAN Shijing, et al. Nanoindentation test study on the influence of chemical environment on the mechanical properties of limestone[J]. , 2022, 41(S2): 3260-3270.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0882 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3260

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