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RISS 인기검색어
- 검색키워드
- 저자 : Mingtang Chai (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Characteristics of Micro-structure of Warm and Ice-Rich Frozen Soil Improved by Cement and Additives
Mingtang Chai,Jianming Zhang,Hu Zhang,Zhenhua Yin 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.10
In permafrost regions, the warm and ice-rich frozen soil (WIRFS) underlying the embankment has a low strength and large compressibility, which threatens the engineering stability. The addition of cement and its additives can improve the mechanical properties of the WIRFS. During the curing and the thawing compression, the micro-structure of the improved WIRFS was changed by hydration reaction and deformation. In this paper, the porosity and directionality of soil were selected as indicators to reflect the variation of micro-structure in the improved WIRFS. Two image processing methods, fuzzy C-means clustering and image segmentation, were introduced to quantitatively calculate the porosity and the directionality of soil particles. The arrangement variation of soil aggregates can reflect the characteristics of micro-structure during the soil improvement. The results indicate that, the addition of cement and additives reduced the directionality of sample before the thawing compression. After the compression, except for the super absorbent polymer, ironic agent, EN-1, Toogood and geopolymer, the addition of antifreeze agent, early strength agent and metakaolin increased the directionality. The average porosity is negatively relevant to the compressibility coefficient. This paper has connected the micro-structure with deformation parameter of the improved frozen soil, which can reflect the improvement mechanism with cement and additives.
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Effectiveness of Ionic Polymer Soil Stabilizers on Warm Frozen Soil
Zhilong Zhang,Hu Zhang,Jianming Zhang,Mingtang Chai 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
Warm frozen soil has characteristics such as low shear strength and high compressibility. To improve its mechanical strength, the ionic polymer soil stabilizers (IPSS): named XRH stabilizer and acid cation exchange resin (CER) were adopted for reinforcing the warm frozen soil from the Beiluhe region of the Qinghai–Tibetan Plateau. To evaluate the effects of IPSS on warm frozen soil and analyze the mechanisms responsible, measurements were made of the physical, chemical and mechanical properties of warm frozen soil, both untreated and following treatment with IPSS. The addition of IPSS to the soil resulted in a significant decrease in the plasticity index, freezing temperature, and cation–exchange capacity of soil. The warm frozen soil were reinforced with XRH and CER, the cohesion increased by 87.9% and 43.1%, respectively, and the compressibility decreased by 44.5% and 41.1%, respectively. The trends of mechanical strength and unfrozen water content of reinforced warm frozen soil were the same, with extreme values being observed in response to treatment with an IPSS content of about 1% (optimal proportion). In addition, the curing mechanism of IPSS on warm frozen soil was analyzed. Overall, applying IPSS to the soil was an effective and feasible measure for reinforcing a warm frozen soil foundation.
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