리그노설포네이트를 혼입한 유동성 채움재의 영구변형 특성 평가

초록

Controlled low-strength material (CLSM) is widely used as backfill and structural fill due to its high fluidity, self-consolidating properties, and self-leveling behavior. This study examines the fluidity, strength, and permanent deformation characteristics of CLSM modified with lignosulfonate. The addition of lignosulfonate increases flowability and extends both the initial and final setting times. CLSMs containing lignosulfonate exhibit lower uniaxial compressive strength on the 3rd and 7th curing days compared to those without lignosulfonate. However, after 14 days of curing, the strength of lignosulfonate-modified CLSM surpasses that of unmodified CLSM. Consequently, CLSMs with lignosulfonate appear more susceptible to high deviatoric stress in the early curing stages but exhibit lower permanent strain under long-term curing and low deviatoric stress. Furthermore, multiple regression analysis reveals that an exponential model incorporating deviatoric stress accurately predicts permanent strain.

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