Abstract: Lime soils are widely used in road engineering. With the rebuilding and expanding of road engineering, it may cause many problems, such as how to treat the lime soil and how to reuse it. The compression and strength mechanical properties are discussed by comparing remolded lime soil with lime soil and pure soil. The results show that, compared to lime soil, the compression coefficient (a1-2) of remolded lime soil increases 2-3 times; the unconfined compressive strength decreases 30%-40%; the internal friction angle increases about 1.2 times and the cohesion reduces 40%. Degradation coefficient (DC) is introduced to evaluate the degradation degree of remolded lime soil. The essential degradation cause of the remolded lime soil is analyzed from the standpoints of aggregation, carbonization and hardening. Compared to pure soil, the clay (d <0.002 mm) content of lime soil decreases and coarse grain (d >0.074 mm) content increases. So, the internal friction angle of lime soil is improved. But the cemented structure between lime soil particles is broken by remolding effect. The cohesion of remolded lime soil decreases because of the remolding; and the other mechanical properties of remolded lime soil are affected.

Key words: lime soil, remolding, degradation coefficient