Two types of compacted tabia were mixed with Perma zyme in proper proportion. The 28 d unconfined compressive strengths of them were higher than those without Perma zyme. The 28 d unconfined compressive strength of compacted tabia with Perma zyme added and higher use level of lime was higher than the others. Strong base environment with high pH value can strain and even kill bacteria. It is indicated that promotion of the soil bacteria to be more activated is not the only factor for Perma zyme as an enzymatic stabilizer to improve the compressive strength of compacted tabia. The XRD pattern of compacted tabia treated with Perma zyme shows that there is a stronger diffraction peak than that without Perma zyme added occurring at near 28° of abscissa. The possibility of some crystal form changes caused by Perma zyme in tabia could not be excluded. Scanning electron microscopy revealed that the microstructure of the tabia treated with Perma zyme became more dense. It is found based on fractal analysis that the compacted tabia with Perma zyme added contains smaller pores and less large pores than the one without Perma zyme added, and Perma zyme is helpful to increase interaction between particles of the compacted tabia.
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