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| Dynamic properties of corroded limestone based on SHPB |
| LI Guanglei1，2，YU Liyuan1，SU Haijian1，JING Hongwen1，ZHANG Tao1，2 |
(1. State key laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and technology，Xuzhou Jiangsu 221116，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，
Xuzhou，Jiangsu 221116，China)
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Abstract In order to investigate the dynamic properties of limestone corroded in the chemical environment， three groups of chemical solutions with different pH values were firstly prepared to corrode limestone specimens for different time periods. Then，the porosity and magnetic resonance image of corroded specimens were obtained using the nuclear magnetic resonance(NMR) test. The impact dynamic properties of corroded specimens were finally tested with the split Hopkinson pressure bar(SHPB) system. The experimental results show that the damage degree of limestone is closely related to the pH value of chemical solutions. The specimens corroded in the acid solution are much more seriously damaged than those in the alkaline and neutral solutions. The damage degree of acid-corroded specimens varies from 1.38% to 2.02%. The porosity and the failure strain of limestone specimens increase with the corrosion time. Specifically，the porosity increases dramatically from 0.26%(in the natural state) to 3.20%(after 28 d acid corrosion). Consequently，the dynamic compressive strength and elastic modulus both decrease in two stages separated by a critical time(14 d)，and the maximal percentages of reduction are up to 36.6% and 59.3%，respectively. The damage degree and the fragment-distribution fractal dimension of limestone specimens both increase with the corrosion time，and there is a linear positive correlation between them in the acid and alkaline environments. However，this correlation between the damage degree and the fractal dimension is not obvious in neutral environment.
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2018, Vol. 37 
