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Geomechanics and Engineering
  Volume 23, Number 1, October10 2020 , pages 31-38

Experimental study on the strength behavior of cement-stabilized sand with recovered carbon black
Kean Thai Chhun, Hyunwook Choo, Panyabot Kaothon and Chan-Young Yune

    Soil-cement stabilization is a type of ground improvement method which has been used to improve the engineering properties of soil. The unconfined compression test is the commonly used method to evaluate the quality of the stabilized soil due to its simplicity, reliability, rapidity and cost-effectiveness. The main objective of this study was to evaluate the effect of recovered carbon black (rCB) on the strength characteristic of cement-stabilized sand. Various rCB contents and water to cement ratios (w/c) were examined. The unconfined compression test on stabilized sand with different curing times was also conducted for a reconstituted specimen. From the test result, it was found that the compressive strength of cement-stabilized sand increased with the increase of the rCB content up to 3% and the curing time and with the decrease of the w/c ratio, showing that the optimum rCB concentration of the tested stabilized sand was around 3%. In addition, a prediction equation was suggested in this study for cement-stabilized sand with rCB as a function of the w/c ratio and rCB concentration at 14 and 28 days of curing.
Key Words
    cement stabilization; recovered carbon black; microfine cement; compressive strength; unconfined compression test
Kean Thai Chhun,Panyabot Kaothon and Chan-Young Yune: Department of Civil Engineering, Gangneung-Wonju National University, Jukheon-gil 7, Gangneung-si, Gangwon-do, 25457, Republic of Korea

Hyunwook Choo: Department of Civil Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, 17104, Republic of Korea

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