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RISS 인기검색어
- 검색키워드
- 저자 : Yifeng Ling (검색결과 4 건)
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Yifeng Ling,Gilson Lomboy,Zhi Ge,Kejin Wang Techno-Press 2023 Structural monitoring and maintenance Vol.10 No.2
High performance concrete (HPC) has been extensively used in thin overlay for repair purpose due to its excellent strength and durability. This paper presents an experiment, where the sensor-instrumented HPC overlays have been followed by dynamic strain and moisture content monitoring for 1 year, under normal traffic. The vibrating wire and soil moisture sensors were embedded in overlay before construction. Four given HPC mixes (2 original mixes and their shrinkage-modified mixes) were used for overlays to contrast the strain and moisture results. A calibration method to accurately measure the moisture content for a given concrete mixture using soil moisture sensor was established. The monitoring results indicated that the modified mixes performed much better than the original mixes in shrinkage cracking control. Weather condition and concrete maturity at early age greatly affected the strain in concrete. The strain in HPC overlay was primarily in longitudinal direction, leading to transverse cracks. Additionally, the most moisture loss in concrete occurred at early age. Its rate was very dependent on weather. After one year, cracking survey was carried out by vision to verify the strain direction and no cracks observed in shrinkage modified mixes.
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Yongkui Yang,Yifeng Ling,Longfei Wang,Peizhe Sun,Lin Zhao,Hongyang Wang 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.5
With rapid industrialization and population growth, sewage sludge generation has increased worldwide, and it needs to be treated properly. The pyrolysis of sewage sludge into biochar provides sustainable benefits for concomitant pollutant adsorption and waste treatment. Sulfamethoxazole (SMX) antibiotics are highly prevalent in waste-water owing to their widespread utilization and low metabolic rate and removal efficiency during conventional waste-water treatment. Biochar is known to effectively remove pollutants from wastewater. However, the adsorption capacity and mechanism of SMX adsorption onto sludge-based biochar are currently unclear. Therefore, the adsorption behavior of SMX on sludge-based biochar from three sources (raw sludge, compost sludge, and digested sludge) and ZnCl2-modified biochar was investigated. Among the unmodified biochars, raw sludge-based biochar exhibited the highest adsorption capacity, followed by compost sludge-based and digested sludge-based biochar. The pore-forming effect of ZnCl2 application significantly increased the biochar specific surface area, which increased the equilibrium adsorption of SMX from 6.1 mg/g to 49.3 mg/g. The adsorption mechanisms involved electrostatic interactions, pore filling, hydrophobic interactions, hydrogen bonding, and π-π interactions. The findings of this study demonstrate the development of sewage sludge biochar and its effectiveness for the treatment of antibiotics containing wastewater.
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Dynamic fracture catastrophe model of concrete beam under static load
Zhonggou Chen,Chuanqing Fu,Yifeng Ling,Xianyu Jin 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.6
An experimental system on three point bending notched beams was established to study the fracture process of concrete. In this system, the acoustic emission (AE) was used to build the cumulative generation order (AGO) and dynamically track the process of microcrack evolution in concrete. A grey-cusp catastrophe model was built based on AE parameters. The results show that the concrete beams have significant catastrophe characteristic. The developed grey-cusp catastrophe model, based on AGO, can well describe the catastrophe characteristic of concrete fracture process. This study also provides a theoretical and technical support for the application of AE in concrete fracture prediction.
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Huaqiang Yuan,Chuanyi Ma,Jiemin Liu,Zhi Ge,Yifeng Ling,Hongzhi Zhang,Abdullah M. Tawfek,Renjuan Sun 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.5
This article aims to study the effects of particle packing and inter-particle force on the rheological behaviors of binary cement paste. Fly ash (FA), ground granulated blast furnace slag (GGBFS), and limestone powder (LP) were added by 10 − 40% of cement weight to prepare the binary binder. The particle packing of each binary binder was analyzed based on the close packing theory and bulk density test. Atomic force microscopy and direct shear method were used to investigate the Hamaker constant and friction coefficient of different binders. Fresh pastes of every binder were prepared with variable solid volume fractions (w/b is 0.50, 0.55, and 0.60), and the rheology was measured by a rotary rheometer. Eventually, two empirical models were proposed to predict the yield stress and plastic viscosity of paste based on the porosity, friction coefficient, and w/b obtained from the experiments, and the accuracy of these new models was verified by ANOVA and p-value approach. The results show that particle packing and inter-particle force play a collaborative role in determining the rheological behavior of paste. Increasing particle packing or reducing inter-particle force (i.e., decreasing porosity or friction coefficient) benefits the enhancement of paste rheology. Moreover, an increase in the Hamaker constant leads to higher friction coefficients for binders. Comparisons between the predicted and experimental results demonstrated that these empirical models accurately capture the rheological behaviors of fresh pastes.
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