Pore Distribution and Damage Evaluation of Modified Red Clay Based on NMR

IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Lijie Chen, He Wang, Qingyang Deng, Xiao Wang, Ting Tang, Baoyou Luo
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Abstract

This study investigates the modification of red clay with calcium carbonate. The pore distribution was obtained using a combination of mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR) techniques. The influence of calcium carbonate content, density, confining pressure, and shear strain on the pores was studied. Introducing pore classification to assess the extent of the damage under different conditions and the relationship between different types of pores. The results show that the content of added calcium carbonate has little effect on pore distribution when the density is low (1.4 and 1.5 g/cm3). The content of calcium carbonate has an influence on pore distribution when the density is high (1.6 g/cm3). With the density increases, the number of macropores and mesopores between soil particles decreases, while the small pores increase. The confining pressure results in the preferential drainage of free water from macropores. The porosity decreases as the confining pressure increases. Under the same confining pressure, as the shear strain increases, the large pores decrease while the small pores increase. Based on the analysis of damage degree, the shear strain is positively linearly related to the damage degree of intragranular mesopores, which forms a convex function relationship with intragranular macropores and intergranular mesopores (except under a confining pressure of 100 kPa).

Abstract Image

Abstract Image

基于核磁共振的改性红粘土孔隙分布与损伤评估
摘要 本研究探讨了用碳酸钙对红土进行改性的问题。孔隙分布是通过汞侵入孔隙模拟(MIP)和核磁共振(NMR)技术相结合获得的。研究了碳酸钙含量、密度、约束压力和剪切应变对孔隙的影响。引入孔隙分类来评估不同条件下的破坏程度以及不同类型孔隙之间的关系。结果表明,当密度较低时(1.4 和 1.5 g/cm3),添加的碳酸钙含量对孔隙分布影响不大。当密度较高时(1.6 g/cm3),碳酸钙的含量对孔隙分布有影响。随着密度的增加,土壤颗粒之间的大孔隙和中孔隙数量减少,而小孔隙增加。封闭压力导致游离水优先从大孔隙中排出。孔隙率随着封闭压力的增加而降低。在相同的约束压力下,随着剪切应变的增加,大孔隙减少,小孔隙增加。根据破坏程度分析,剪切应变与粒内中孔的破坏程度呈正线性关系,与粒内大孔和粒间中孔形成凸函数关系(约束压力为 100 kPa 时除外)。
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来源期刊
Russian Journal of Nondestructive Testing
Russian Journal of Nondestructive Testing 工程技术-材料科学:表征与测试
CiteScore
1.60
自引率
44.40%
发文量
59
审稿时长
6-12 weeks
期刊介绍: Russian Journal of Nondestructive Testing, a translation of Defectoskopiya, is a publication of the Russian Academy of Sciences. This publication offers current Russian research on the theory and technology of nondestructive testing of materials and components. It describes laboratory and industrial investigations of devices and instrumentation and provides reviews of new equipment developed for series manufacture. Articles cover all physical methods of nondestructive testing, including magnetic and electrical; ultrasonic; X-ray and Y-ray; capillary; liquid (color luminescence), and radio (for materials of low conductivity).
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