• Title/Summary/Keyword: Earth-Block

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A Study on the Change of the Perception of Students' Computational Thinking and Scientific Attitudes in Earth Science Classes Using a Block-based Coding (블록형 코딩프로그램을 활용한 지구과학 수업에서 학생들의 컴퓨팅 사고력에 대한 인식 및 과학적 태도 변화 연구)

  • Han, Shin;Kim, Hyoungbum
    • Journal of the Korean Society of Earth Science Education
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    • v.12 no.2
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    • pp.131-140
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    • 2019
  • In this study, a block-base coding that could develop computing thinking was applied to Earth science teaching and learning to identify how the perception of computational thinking and scientific attitude was changed as part of creativity education. Based on the results of the study, the conclusions are as follows: First, an Earth science education program was developed using a block-based coding for elementary school students. The 12-hour program was designed for inquiry activities to encourage students to engage in various thinking by providing them with activity-oriented problems. Second, the Earth science education program using a block-based coding showed significant results in confidence in the use of a computer program, integrated learning with a computer, computational thinking, and problem-solving factors with computational thinking. Third, the Earth science education program using block-based coding showed significant differences in the categories of curiosity, criticism, cooperation, persistence, and creativity. It could be judged that it was effective for students in the process of questioning and trying to solve the problem themselves.

A Study on the Measurements of the Thermal Conductivies of the Earth Block Materials. (흙벽돌 재료의 열전도율측정에 관한 연구)

  • 고재군
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.6 no.2
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    • pp.803-808
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    • 1964
  • In this experiment, it was attempted to determine the thermal conductivities of earth block materials which are recently much available for farm building constructions in Korea as lower cost building materials. For this experiment, two kinds of earth block materials were sampled. One of them was pure earth and the other was cementstabilized earth with a ratio of earth to cement by volume, 20 to 1. Cylindrical sections of specimen surrounding a steel pipe(I.D. =1 inch) were used. A resistance neater in the pipe and thermometers for the measurement of radial temperature distribution were installed as shown in Fig. 1 and photograph 1. The heat which flows through the pipe and the sample was produced by passing a current through a resistance wire stretched along the pipe axis. The complete apparatus used in this experiment is schematically shown in Fig. 1.

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Effects of Anchor Block on Stability of Concrete Electric Pole (콘크리트전주의 안정성에 미치는 근가의 영향)

  • Ahn, Tae-Bong
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.11
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    • pp.5-10
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    • 2012
  • Many electric poles in the softground have been collapsed due to external load. In this study, several tests were performed with variation of numbers and depths of anchor blocks to find effects of anchor blocks on stability of concrete electric poles through earth pressure and displacement analysis. 1.50m depth of anchor block seems appropriate among three kinds of depths. The 2.25m depth of anchor block makes larger displacement due to disturbance caused by excessive excavation. The deeper anchor block, the less earth pressure of passive zone, an active earth pressure gets larger. When two anchor blocks were installed, displacement at top pole decreased 43.8% and 55.6% at ground when 1 anchor block was installed.

Establishment of Guardrail Distance for Safety of Reinforced Earth Retaining Wall by Vehide Collision (차량충돌에 대한 보강토 옹벽 안전성 확보를 위한 가드레일 설치거리)

  • Park, Kwon;Hong, Ki-Nam;Ahn, Kwang-Kuk
    • Journal of the Korean Society of Safety
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    • v.24 no.5
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    • pp.57-62
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    • 2009
  • In this study, the numerical analyses regarding the distance between the guardrail and the reinforced earth wall as parameter were performed to determine the safe distance of guardrail installed on reinforced earth wall from the reinforced earth wall. The analyses were fulfilled by increasing the distance between the guardrail and reinforced earth wall from 150mm to 750mm. The computer program used in this research is LS-DYNA, which is very' popular in analysis of vehicle collision. Ford single unit truck in NCAC was employed as the model of vehicle and the velocity of vehicle collision was 80km/hr. As a results of analyses, the safety of guardrail was secured regardless of the distance between the guardrail and block of reinforced earth wall. However, to secure the safety of block of reinforced earth wall the distance between the guardrail and block of reinforced earth wall should be over 600mm.

Troubles and Countermeasures of Geogrid-Reinforced Earth Wall (지오그리드 보강토 옹벽의 설계/시공에 따른 문제점과 대책방안)

  • 조삼덕
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.10a
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    • pp.315-321
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    • 2001
  • Since 1984, block-type reinforced earth wall with geogrid reinforcement has been widely used for retaining wall applications till now in Korea. The use of geogrid as a reinforcement in the reinforced earth wall is steadily increased in an amount over 1,500,000㎡ in a year However, still need exists that some problems in design and construction practices should be made to review, Therefore, this paper reviewed reasonable criteria for selection of backfills, design details considering the effect of the upper soil slope on reinforced earth wall, horizontal displacement of facing block during compaction, and the damage of geogrid reinforcements on the edge part of facing block. Finally, alternative methods of measures on those problems are proposed.

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The Model Test on Load Reduction Effect of Caps Foundation Method (캡스기초공법의 하중경감효과에 관한 모형시험)

  • Park, Jong-Man;Kang, Chi-Gwang;Kwak, Jung-Min;Han, Sang-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.11
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    • pp.479-486
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    • 2019
  • The caps foundation method can reduce the load of a building by using the arching effect, but verification of the method is still insufficient. In this paper, a model test was performed to quantitatively prove the load reduction effect by this method. The test was carried out using six conditions according to the size of caps foundation block and the area of the loading plate. The test results show that the earth pressure was the highest at the position closest to the loading point regardless of the size of caps foundation block and the area of the loading plate. At the highest earth pressure position, when the loading plate area was 30 cm × 30 cm, the earth pressure of a small block was reduced by 35.4% on average, and that of a big block was reduced by 39.7% compared to the pressure with no block. When the loading plate area was 60 cm × 60 cm, the earth pressure of the small block was reduced by 33.9% on average, and the earth pressure of the big block was reduced by 42.7%. Therefore, if the caps foundation method is applied, the load will be reduced by more than 33% for a small block and 39% for a big block.

A Comparative Analysis of Displacement Measurement of the Earth Surface by Load for Root Anchor Block and Rectangle Anchor Block (기초근가와 기존근가의 하중에 따른 변위 비교분석)

  • Mun, Sung-Won;Kim, Jeom-Sik;Kim, Do-Young;Park, Yong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.6
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    • pp.863-869
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    • 2013
  • In this paper, we compared and analyzed for safety 1.2m rectangular anchor block and arch-type root anchor block. First, numerical analysis was performed three-dimensional nonlinear method by numerical model test using finite element analysis program "Visual FEA". Then, measure displacement of the surface of the earth after construct each anchor block at 14M electric pole and increase loads through field verification tests for safety evaluation.

Basic Properties of Permeable Block mixed with Diatomite (규조토를 혼입한 투수블록의 기초특성)

  • Kim, Min-Ho;Choi, Byung-Cheol;Yoo, Jae-Gyun;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.123-124
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    • 2021
  • Recently, the danger of fine dust has emerged worldwide. In general, fine dust refers to particulate matter less than 10㎛ and ultrafine dust less than 2.5㎛, and according to the announcement by HEI (Health Impact Research Institute) in 2015, the concentration of ultrafine dust in Korea is the second highest among OECD member countries. It was investigated. In this study, an experiment was conducted to analyze how the diatomaceous earth substitution rate affects the strength characteristics of the permeable block. As the replacement rate of diatomaceous earth increased, the strength decreased. The reason why the strength decreases with the use of diatomaceous earth is that the strength of the hardened body decreases as the structure of the hardened body becomes less dense as the amount of diatomaceous earth increases, and the reason that the strength decreases as the replacement rate of diatomaceous earth increases is the reason for the absorption performance of diatomaceous earth. Therefore, it is judged that a void was generated inside the hardened body while water was absorbed and then evaporated or discharged in the matrix, and accordingly, the strength decreased.

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Behavior of Reinforced Earth Retaining Wall for Permitting Reinforcement to Subside with Monitoring (현장계측을 통한 보강재 침하형 보강토 옹벽의 거동특성)

  • Chung, Jin-Hyuck;Oh, Jong-Keun;Lee, Song
    • Journal of the Korean Geotechnical Society
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    • v.25 no.2
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    • pp.5-15
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    • 2009
  • The conventional reinforced earth retaining wall has the connector system to fix the reinforcement and block. However, this system defect may cause the crack of block and the rupture of reinforcement due to the stress concentration near the face of reinforced earth retaining wall. Hence, the new connector system which was able to allow the settlement of reinforcement was developed in this study and a test was carried out in the study area which is divided into the conventional reinforced earth retaining wall and reinforced Earth Retaining Wall driving the settlement. As the results of field monitoring in situ, the ratio of tensile force calculated at maximum value on contiguous portion of front block showed that the settlement type decreased the stress concentration near the face of front block greater than the conventional type.

Research for a comparison an analysis of grounding electrode in the Foundation of building (건축물기초 접지극의 비교 분석에 관한 연구)

  • Kim, Sung-Sam;Kim, Ju-Chan;Lee, Chung-Sik;Koh, Hee-Seog
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.271-273
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    • 2005
  • In this paper, The experiment is performed for using reinforced building of foundation as a down conductor and a substitutional earth electrode. It is shown that earth resistance is influenced by mortar block resistance and concrete resistance more than the change of the resistance which is about steel reinforcing volume in all of the mortar block model and concrete block model.

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