Abstract
Chemical corrosion plays a significant role in affecting the properties of rock materials. To understand the effects of chemical corrosion on the pore structure and mechanical properties of sandstones, porosity, T2 spectrum distribution, and NMR images of sandstone specimens were measured after every 10 days of immersion in chemical solutions using the nuclear magnetic resonance (NMR) technique. Static uniaxial compressive tests and dynamic compressive tests were conducted using a conventional servo-controlled testing machine and a split Hopkinson pressure bar (SHPB) system for specimens treated with chemical corrosion. The test results showed that after being treated with chemical corrosion, the porosity of a specimen increased, the T2 spectrum distribution would successively shift towards the right, and the distribution of pores tended to become more irregular. Additionally, all of the compressive strength and elastic modulus of sandstone treated with chemical corrosion under static and dynamic loads decreased, and the peak strain increased. The effect order of a chemical solution on the pore structure and mechanical properties of sandstone was H2SO4>NaOH>distilled water, which would be related to the different mechanisms of a water-rock reaction. According to the experimental results, the correlations between the mechanical properties and porosity were established. The results can serve as a reference for research in related fields.
Highlights
Rock, as a natural geological body, has a pore structure that is closely related to the surrounding environment [1]
The Nuclear magnetic resonance (NMR) technique can vividly reflect the distribution of pores inside rocks
The alterations on the pore structure and mechanical properties of sandstone caused by chemical corrosion have been experimentally investigated
Summary
As a natural geological body, has a pore structure that is closely related to the surrounding environment [1]. It is helpful to analyze the corrosion mechanism of chemical solutions and the degradation characteristics of rock mechanical properties to develop the study of the evolution of rock pore structure under the condition of chemical corrosion. Many advanced techniques, such as CT scanning [11,12,13,14], SEM [15,16,17,18], and P-wave velocity [1, 19,20,21], have been applied to the measurement of pore structures of rocks. The NMR technique is used to investigate the pore structure of rocks in this work
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
