Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Unconfined Compressive Strength Characteristics of E.S.B. Mixed Soil Based on Soil Compactness and Curing Period

토양의 다짐도와 재령기간에 따른 E.S.B. 혼합토의 일축압축강도특성

  • Oh, Sewook (Department of Construction & Disaster Prevention Engineering, Kyungpook National University) ;
  • Kim, Hongseok (Department of Construction & Disaster Prevention Engineering, Kyungpook National University) ;
  • Bang, Seongtaek (Department of Construction & Disaster Prevention Engineering, Kyungpook National University)
  • Received : 2019.04.02
  • Accepted : 2019.04.29
  • Published : 2019.05.01
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Abstract

This study aims to provide basic data for soil packaging differing in accordance with the strength characteristics of mixed soil, using E.S.B. (Eco Soil Binder), an eco-friendly hardening agent, based on the type of soil. The soil used in this study is weathered granite soil readily collected in and around Korea, and is classified into SW, SP and SC according to soil classification systems. The test piece for the unconfined compressive strength test has dimensions of 50 mm in diameter and 100 mm in height, with the mix ratio of E.S.B. proportional to the weight of mixed soil changed from 5% to 10%, 15%, 20%, 25%, and 30%, where compactness of 90% and 100% were applied according to each condition to analyze the unconfined compressive strength characteristics at material ages of 3, 7, and 28 days. Also, the ratio of soil packaging standard strength and unconfined compressive strength was calculated to determine the optimal E.S.B. mix ratio, whereby the field applicability of the unconfined compressive strength using the estimation equation of ACI209R was evaluated.

본 연구에서는 토양의 종류에 따라 친환경고화재인 E.S.B.(Eco Soil Binder)를 사용하여 혼합토의 강도특성과 활용목적에 따른 흙 포장의 기초자료를 제공하고자 한다. 연구에 사용된 토양은 우리나라 주변에서 흔히 채취되는 화강풍화토로 토질분류법에 의한 SW, SP, SC로 구분된다. 일축압축강도 시험을 위한 공시체는 지름 50mm, 높이 100mm의 크기로 혼합토 중량대비 E.S.B.의 혼합비율을 5%, 10%, 15%, 20%, 25%, 30%로 변화시키고 각 조건에 따라 다짐도를 90%, 100%를 적용하고 재령기간 3, 7, 28일에 따른 일축압축강도 특성을 분석하였다. 또한 흙 포장 기준강도와 일축압축강도의 강도비를 산정하여 최적의 E.S.B.혼합비율을 결정하고 ACI209R의 추정식을 활용한 일축압축강도의 현장 적용성을 평가하였다.

Keywords

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Fig. 1. Compaction test result

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Fig. 2. Particle size analysis result

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Fig. 3. Experimental apparatus

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Fig. 4. Unconfined compressive strength according to the compactness 90%

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Fig. 5. Unconfined compressive strength according to the compactness 100%

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Fig. 6. Unconfined compressive strength according to the curing time (SW, compactness 90%)

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Fig. 7. Unconfined compressive strength according to the curing time (SW, compactness 100%)

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Fig. 8. Unconfined compressive strength according to the curing time (SP, compactness 90%)

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Fig. 9. Unconfined compressive strength according to the curing time (SP, compactness 100%)

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Fig. 10. Unconfined compressive strength according to the curing time (SC, compactness 90%)

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Fig. 11. Unconfined compressive strength according to the curing time (SC, compactness 100%)

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Fig. 12. Strength ratio (UCR) according to the E.S.B. mixing ratio(SW)

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Fig. 13. Strength ratio (UCR) according to the E.S.B. mixing ratio(SP)

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Fig. 14. Strength ratio (UCR) according to the E.S.B. mixing ratio(SC)

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Fig. 15. Comparison between estimated and compressive strength of SW

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Fig. 16. Comparison between estimated and compressive strength of SP

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Fig. 17. Comparison between estimated and compressive strength of SC

Table 1. Physical properties of soil

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Table 2. Portland cement composition analysis

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Table 3. Physical properties of soil stabilizers

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Table 4. Physical properties of soil stabilizers

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Table 5. Physical properties of soil stabilizers of soil stabilizer

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Table 6. Toxicity to fish test result

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Table 7. Experimental condition

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Table 8. Estimated compressive strength according to curing period

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