Materials Reports  2022, Vol. 36 Issue (Z1): 21100220-6 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on Permeability and Strength of Core Soil in City Wall Mixed with Regenerated Micro Powder |
| WANG Xiaojiao1, QI Chengzhi1, ZHOU Li'an1, LI Taihang2, CHEN Haoxiang1, WANG Zefan1, MA Xiaoyu1, FENG Yanjie1, LUO Yi1
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1 School of Civil and Traffic Engineering,Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2 Beijing Guo Wen Xin Cultural Rolics Protection Co., Ltd., Beijing 100000, China |
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Abstract In order to explore the effect of recycled micro powder on the permeability and strength of the inner core soil of the city wall, and achieve the goal of utilization and sustainable development of construction waste, the abandoned old bricks of the city wall were ground and added to inner core soil of the city wall with the proportion of 10%, 20% and 30% of mass. The permeability tests were carried out by controlling the change of confining pressure and water head. To explore the reasonable content of recycled micro-powder which is beneficial to the permeability of the inner core soil under different confining pressure and water head, the variation of unconfined compressive strength under different dosage of recycled micro-powder was investigated. The experimental results show that the confining pressure has a significant effect, while the change of water head has little on the permeability coefficient of the core soil. The permeability coefficient of the core soil increases with the increase of the recycled micro-powder content. When the moisture content is 12.1%, the unconfined compressive strength of soil increases first and then decreases with the increase of recycled micro-powder content, and reaches the maximum value at the content of 15%. In conclusion, when the recycled micro-powder content is 15%, the anti-permeability ability of soil is not significantly reduced, and the inner core soil can be guaranteed to have a high strength. Therefore, it is beneficial to maintain the performance of the core soil to control the dosage of recycled micro-powder at about 15%.
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Published: 05 June 2022
Online: 2022-06-08
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| Fund:National Natural Science Foundation of China(51774018,51608029), Innovation Project of Graduate of Beijing University of Civil Engineering and Architecture in 2021(PG2021007), and Doctoral Research Ability Improvement Project of Beijing University of Civil Engineering and Architecture(DG2021003). |
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