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RISS 인기검색어
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- 저자 : Sam Ang Keo (검색결과 2 건)
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Long-Term Temperature Measurement inside Operating Tunnels during Winter in Gangwon, Korea
Sam Ang Keo,Kyung-Jae Jun,Chan-Young Yune 한국도로학회 2018 한국도로학회 학술대회 발표논문 초록집 Vol.2018 No.05
Tunnel is the main infrastructure in transportation system especially in Gangwon province which has 90% of its area covered by mountains. Responding to the needs for evaluating the tunnel damage in this region, the temperature inside 10 tunnels, one-way and two-way, were measured in winter by using temperature sensors. The temperatures along the length of tunnel, from the entrance until the exit, were obtained from sensors placed at 2 meters above the road. The measurement results showed the distribution of the temperature along the length of the tunnels since November 2016 until March 2017. The data showed that among all the one-way tunnels, the variation of the temperature at all positions along the length of the tunnels have almost the same gradient of temperature of all months observed. There were no significant changes between the temperatures at those points along the tunnel; whereas the changes at the entrances and the exits of the tunnels were remarkable. It was also noticed that there was the different trend of temperature variation between the one-way and two-way tunnels.
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Effect of Acrylate-Cement Grout on the Unconfined Compressive Strength of Silty Sand
Kean-Thai Chhun,이수형,Sam-Ang Keo,윤찬영 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
Chemical grouting has been widely used to ensure the stability and durability of built structures by enhancing the engineering properties of soils. The objective of this study was to investigate the effect of a newly developed acrylate-cement grout, composed of component A (acrylic polymer, catalyst, and hardener) and component B (cement) having mixing ratios varying from 0.5% to 2% of the total weight, on the unconfined compressive strength of silty sand. Three series of laboratory tests (gel time, expansion ratio, and unconfined compression strength) were carried out on reconstituted soil samples with a void replacement ratio of 80% and 100% by acrylate-cement grout. The results showed that the optimum cement ratio of the chemical grout was 1.5% based on the unconfined compressive strength and the elastic modulus for the silty sand with grouting.
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