| 양생방법이 고결모래의 압축강도에 미치는 영향 |
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학술지명 대한토목학회
저자 김기영,박성식,최현석,김창우
발표일 2009-10-08
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Cemented soils or concrete are usually cured under moisture conditions and their strengthincreases with curing time. An insufficient supply of water to cemented soils can contribute to hydrationprocess during curing, which results in the variation of bonding strength of cemented soils. In this study, bythe consideration of in situ water supply conditions, cemented sand with cement ratio less than 20% wasprepared by air dry, wrapped, and underwater conditions. A series of unconfined compression tests werecarried out to evaluate the effect of curing conditions on the strength of cemented soils. The strength of airdry curing specimen was higher than those of wrapped cured specimen when cement ratio was less than 10%,whereas it was lower when cement ratio was greater than 10%. Regardless of cement ratio, air dry curedspecimens were stronger than underwater cured specimens. A strength increase ratio with cement ratio wascalculated based on the strength of 4% cemented specimen. The strength increase ratio of air dry curedspecimen was lowest and that of wrapped and underwater cured ones increased by square. Strength of air drycured specimen dropped to maximum 30% after wetting when cement ratio was low. However, regardless ofcement ratio, strength of wrapped specimens dropped to an average 10% after wetting. |