Application of Computerized Tomography in Evaluation on Self-healing Performance of Compacted Bentonite

After Penetration test, computerized tomography was carried on to evaluate the self-healing performance of compacted bentonite. By contrasting the CT number, CT variance and CT images of the fracture zone and the control zone in cross-section to analyse the CT characteristics in soil. The results showed that under confined conditions, the soil expanded upon imbibing water, internal voids narrowed, macro cracks and connectivity pores disappeared. Meanwhile, CT number of the fracture zone was lower than the control zone, CT variance was on the contrary. All the data above showed that the compacted bentonite has good self-healing performance, although fracture has certain influence on structure of healed samples.