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한국콘크리트학회|IJCSM 2022년 5월

논문명 Impact of Mixing Methods and Cement Dosage on Unconfined Compressive Strength of Cement-Stabilized Macadam
저자명 (Kaiyin Zhao) ; (Lijun Zhao) ; (Jinru Hou) ; (Zhongxu Feng) ; (Wenzhi Jiang)
발행사 한국콘크리트학회
수록사항 IJCSM, Vol.16 No.3 (2022-05)
페이지 시작페이지(271) 총페이지(16)
ISSN 1976-0485
주제분류 재료 / 구조
주제어 ; cement stabilized macadam (CSM); unconfined compressive strength; vibratory mixing; cement dosage
요약2 The technology of vibratory mixing has been applied to improve the compressive strength of cement-stabilized macadam (CSM). The aim of this study is to investigate the effect of vibration acceleration and cement dosage on the unconfined compressive strength and density of CSM. The mixtures with four cement dosages (2%, 3%, 4%, and 5%) were prepared by conventional mixing (0 g) and vibratory mixing (1 g, 2 g, and 3.5 g). The unconfined compressive strength was tested under different mixing methods. And the microstructure of CSM was analyzed by scanning electron microscope. The results indicate that samples using vibratory mixing have higher strengths, lower coefficient of variation, and denser microstructures, compared with the conventional compulsory mixing. Compared with 15% in conventional mixing, the strength variable coefficient of CSM is less than 10% in the vibratory mixing method. As the cement dosage and the vibration acceleration increase, the unconfined compressive strength increases. However, cement dosage has a more significant influence on improving the unconfined compressive strength than the mixing method. With the increase of every 1% in cement dosage, the 7-day strength of conventional mixing and in vibratory mixing average increased by 59% and 38%, respectively. However, the maximum improvement rate of the UCS value is 20-56.7% when vibration acceleration increased from 0 to 1 g. Especially when cement dosage is high, the effect of vibratory mixing on improving strength is limited. Besides, vibratory mixing reduces the original cement dosage by over 1.6% with the qualified unconfined compressive strength at vibration acceleration of 2 g, which is recommended in construction practice.
소장처 한국콘크리트학회
언어 영어
DOI https://doi.org/10.1186/s40069-022-00505-z