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RISS 인기검색어
- 검색키워드
- 저자 : Mingjing Fang (검색결과 4 건)
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Fang, Mingjing,Wu, Shaopeng,Park, Daewook,Chen, Hao,Xie, Jun Elsevier 2017 Construction and Building Materials Vol.154 No.-
<P><B>Abstract</B></P> <P>The impermeability and moisture damage resistance should be enhanced if railway asphalt mixture (RAM) applied in seasonal frozen area. This paper presents an selection of anti-freeze additives for RAM by conducting highway-based laboratory tests. Five powder alternatives, hydrated lime, fly ash, red clay brick powder, Portland cement and U-type expensive agent (UEA) with different ratio and components, were prepared in terms of concepts with filling, bonding, waterproofing, reinforcing, anti-freezing and self-impermeability. Replacing 50% by weight of mineral filler was proposed in the fabrication of RAM, and the other test conditions were kept in consistence. By experiencing Marshall test, permeability test, indirect tensile test and linear shrinkage test, the results indicated that (i) the bituminous cement made from asphalt binder, mineral filler and different additives can significantly influence the performance of RAM; (ii) A potential combination with hydrated lime (40%), fly ash (20%), red clay brick powder (20%) and Portland cement (20%) can enhance the anti-freeze ability and water damage resistance of RAM; (iii) UEA commonly used in concrete with the concept of self-compaction is not appropriate for being as anti-freeze additive component for RAM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A clear definition to railway asphalt mixture (RAM) was made. </LI> <LI> Five expected abilities of anti-freeze additive selection for RAM were proposed. </LI> <LI> A combination of four components is recommended for anti-freeze additive. </LI> <LI> UEA is not suitable for being as anti-freeze additives for RAM. </LI> </UL> </P>
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Cheng Luo,Mingjing Fang,Shicong Zhai,Xiangping Ou,Yang Pu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11
The compaction of over-wet fluvioglacial deposits filler is difficult due to its high moisture content. This paper presents an easy but effective improvement method to treat over-wet fluvioglacial deposits using quicklime. Firstly, several tests are conducted to figure out the properties of the over-wet fluvioglacial deposits. Then, the relationship curves between the difference of natural-optimal moisture content and compaction degree are established. Finally, field test is carried out and the compaction degree of the subgrade soil is evaluated by sand cone method. The field test in the case study shows that the moisture content difference of filler is 10.9%, and the optimal quicklime content is 6% according to the curves. Results indicate that the average compaction degree of subgrade soil is 94.90% (>93%) and the value of CBR is much higher than required 3%, which proves that the method using quicklime works well to improve over-wet fluvioglacial deposits filler for rapid construction of highway embankment. Considering the inadequacy of stiffness of quicklime-treated filler, the rapid increase of stiffness for the upper roadbed using over-wet fluvioglacial deposits filler needs further research.
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Analysis of asphalt concrete track based on service line test results
Lee, Seong-Hyeok,Park, Dae-Wook,Vo, Hai Viet,Fang, Mingjing Elsevier 2019 Construction and Building Materials Vol.203 No.-
<P><B>Abstract</B></P> <P>Most of railways in Korea are constructed with ballasted tracks. However, high-speed railways such as Gyeongbu line and Honam line are running on concrete tracks, a type of ballastless track. The asphalt track, a different type of ballastless track, requires no construction joints due to its viscoelasticity and have the advantage of reduced noise and vibration. Other merits of the track include fast restoration from natural disasters of derailment, and easy maintenance. This paper performs a real scale test and numerical analysis to evaluate the behaviors of the asphalt track systems mentioned above. Long-term monitoring was performed on the AC track at Baekwon Station, Gyeongbuk Line by the web-based measurement system. The performance test was conducted, and the data were collected for the analysis. The results confirmed that the behaviors of the AC track are closely related to the seasonal temperature changes. As a result of comparison with numerical analysis, the measured and predicted roadbed pressure and AC strain values (as a high-speed train is passing through) met the allowable standard.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The pressure gauges and the strain rate meters were buried under the test construction. </LI> <LI> Service line test was performed using the web-based automated measuring system. </LI> <LI> The behaviors of the asphalt concrete substructure during the train operation were analyzed. </LI> <LI> The effects of temperature and train speed were evaluated by comparing the theoretical equation with the numerical results. </LI> </UL> </P>
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Da Li,Jianjun Ma,Chaosheng Wang,Xiaojuan Gao,Mingjing Fang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.8
This paper presents a new method to evaluate the piping risk of unconfined sandy cobble aquifers during the dewatering of deep foundation pits. Firstly, the possibility of piping is judged according to the particle size distribution and pore diameter of the sandy cobble stratum. Secondly, the critical hydraulic gradients of particles with different sizes are calculated according to the pipe flow model. Thirdly, the hydraulic gradient around the foundation pit during the dewatering process is calculated by numerical method. Then, combined with the distribution of hydraulic gradient around the foundation pit and the critical hydraulic gradients of particles with different sizes, the range of moveable particles with different sizes in the surrounding stratum is evaluated. Finally, according to the sandy cobble aquifers conditions and the influence of particle movement on the stratum, the level of piping risk is determined. This method was successfully applied to evaluate the piping risk of Tawan Station in Luoyang Metro Line No.1, and according to the risk evaluation the pensile curtain was recommended for the retaining structure in this case. From the satisfied applications, this method is a reference for the evaluation of piping risk and selection of retaining structure when considering the impact of the dewatering in deep foundation pit with unconfined aquifers on the surrounding stratum.
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