To study the freeze-thaw durability of Aught-Set(AS) firming agent modified soil

a series of triaxial tests were conducted. The mutual relationships between stress-strain relationship

static strength

dynamic modulus and critical dynamic stress of AS firming agent modified soil and curing time

freeze-thaw cycles

cooling temperature were deeply analyzed. The results show that the unconfined compressive strength of 7 d is 75% than that of 28 d. The stress-strain curves of AS firming-agent modified soil are strain-softening and in brittle failure shape. The static strength

critical dynamic stress and resilient modulus decrease in exponential form with the increase of freeze-thaw cycles

and after 6 cycles of freezing and thawing

the trend is stable. Under the same dynamic stress

the cumulative plastic strain of samples develop from stable state to failure because of freezing and thawing. After many times of freeze-thaw cycles

the lower the negative temperature

the little influence on the mechanic properties.