• Title/Summary/Keyword: Construction level

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Studies on the corrosion of steel rebar in blended cement extracts containing 3.5% NaCl (3.5% NaCl을 함유한 혼합 시멘트 추출물에서 철근의 부식에 관한 연구)

  • Subbiah, Karthick;Lee, Han Seung;Park, TaeJoon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.109-110
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    • 2021
  • An attempt has been made on a constructive approach to evaluate the performance of snail shell ash (SSA) for its corrosion performance under marine environments. Corrosion performance of steel rebar in chloride contaminated SSA with (0% to 50%) replacement levels of cement extract medium was examined through electrochemical and weight loss techniques. Initially, snail shell powder (SSP) is made by pulverizing and subsequently SSA is by thermal decomposition methods. A critical level of 20 % SSA improved both corrosion resistance properties of cement extracts. SSA is a suitable replacement material for natural limestone in cement productions.

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Development of User-centered Fire Safety Evaluation Model for School Buildings (교육시설의 사용자 중심 화재안전수준 평가모형 개발)

  • Park, Sung-Chul;Kim, Jin-Wook
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.238-239
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    • 2021
  • This study presented the development of a user centered school facility fire safety evaluation model that would support fire safety evaluation, which is globally recognized as being important in terms of school safety, to be more efficiently implemented in the school field mainly by students. The study consisted of five steps. First, actual condition survey tools were developed based on the major fire safety evaluation items derived through literature review. Second, the characteristics of domestic school facilities in terms of fire safety were developed using the survey tools. Third, an evaluation model at a level utilizable by students was developed based on the foregoing characteristics. Fourth, the applicability of the model was verified through a trial application of the model to elementary school students. Finally, legal and institutional improvement plans and fire safety education materials were presented through a policy proposal.

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Forecasting Housing Demand with Big Data

  • Kim, Han Been;Kim, Seong Do;Song, Su Jin;Shin, Do Hyoung
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.44-48
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    • 2015
  • Housing price is a key indicator of housing demand. Actual Transaction Price Index of Apartment (ATPIA) released by Korea Appraisal Board is useful to understand the current level of housing price, but it does not forecast future prices. Big data such as the frequency of internet search queries is more accessible and faster than ever. Forecasting future housing demand through big data will be very helpful in housing market. The objective of this study is to develop a forecasting model of ATPIA as a part of forecasting housing demand. For forecasting, a concept of time shift was applied in the model. As a result, the forecasting model with the time shift of 5 months shows the highest coefficient of determination, thus selected as the optimal model. The mean error rate is 2.95% which is a quite promising result.

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Field Application of Mass Concrete Applying Hydration Heat Differential Method and Insulation Curing Method (수화발열량차 및 단열양생 공법을 활용한 매스콘크리트의 현장적용)

  • Han, Jun-Hui;Lim, Gun-Su;Shin, Se-Jun;Jeon, Choung-Keun;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.227-228
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    • 2023
  • This study is tocompare and analyze the results of hydration heat analysis and on-field measurements using the method with hydration heat difference and insulation curing method for controlling hydration heat in mass concrete. As a result of the analysis, the temperature difference between the center and the surface was predicted very similarly, and the mass concrete surface was controlled to a safe level when evaluating with a temperature crack index, and after being finished, it was confirmed that there was no hydration crack.

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PROJECT MANAGEMENT STRATEGY FOR SUSTAINABLE INTEGRATION OF STADIUMS

  • Sven Schmedes
    • International conference on construction engineering and project management
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    • 2011.02a
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    • pp.269-272
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    • 2011
  • The impact of a new stadium on the urban context and regional development is significant. Especially where several new stadiums are built for single mega events like the Olympic Games, Commonwealth Games or the Soccer World Cup the impact is even higher. Objective of this paper is to identify and analyze the key drivers for sustainable integration of stadiums within the existing context. The level of sustainability is analyzed based on four different categories: urban, social, environmental and economics. Particular focus is on the project management strategy for implementation of the key drivers during pre-design, design and execution. In conclusion key elements of the project management strategy for sustainable integration of a stadium within the urban, environmental, social and economic context are summarized.

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ATTITUDES TOWARDS KNOWLEDGE SHARING AMONG QUANTITY SURVEYORS

  • Kherun Nita Ali;Md Asrul Nasid Masrom;Pow Yih Wen
    • International conference on construction engineering and project management
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    • 2011.02a
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    • pp.567-574
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    • 2011
  • The purpose of this paper is to identify factors that influence knowledge sharing and determine the attitudes of quantity surveyors towards knowledge sharing based on the factors. The analysis was based on an online questionnaire survey of Registered Quantity Surveyors from Selangor and Kuala Lumpur. Individualism and collectivism were identified as two major factors that influence attitude towards knowledge sharing. Indicators of individualism include individual attitude, competitiveness, care, incentives and rewards; while the indicators of collectivism are trust, social behaviors and motivation. The findings show that the level of attitudes towards knowledge sharing among quantity surveyors is generally high under enabling organizational environment. However, this is a cautious conclusion as the valid sample on which the analysis is based is relatively small. Willingness to share was found to be highest when incentives and rewards are involved as well as when there is a knowledge management system to promote continuous learning and sharing of knowledge.

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Environmetal Characteristics of Reed Habitat in Nakdong Estuary Saltmarsh (낙동강 하구 염습지의 갈대서식 환경 특성)

  • Ryu, Sung-Hoon;Kim, Kyung-Hoi;Lee, In-Cheol
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.22 no.2
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    • pp.187-194
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    • 2016
  • In this paper, as a basic research for the restoration and construction of easuary saltmarsh, To observe the habitat environment for reed, we observed sediment environment (Particle size, water content, pH, nutrient analysis ($NH_4-N$, $PO_4-P$)), ground water level, ground level, individual numbers of reed, maximum reed height. As a result of this study, sediment particle size and moisture content of soil on the study area not effected reed habitat, pH showed no difference in each site. $NH_4-N$ and $PO_4-P$ concentration also no difference in each site. Ground level of reed habitat area is more higher than none reed habitat. However Ground water level of reed habitat area is more lower than none reed habitat. As a results of analyzing the influence factors for reed habitat in Nakdong estuary saltmarsh, ground water level and ground level is most influenced factor for reed habitat.

Construction of the permeate tuner system by the steeple morph of the matter

  • Kim, Jeong-lae;Lee, Woo-cheol
    • International Journal of Advanced Culture Technology
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    • v.6 no.3
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    • pp.187-192
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    • 2018
  • Permeate alteration technique is compounded the steeple sway-tuner status of the gleam-differential realization level (GDRL) on the permeate realization morph. The realization level condition by the permeate realization morph system is associated with the sway-tuner system. As to search a dot of the dot situation, we are gained of the permeate value with character-dot by the output signal. The concept of realization level is composed the reference of gleam-differential level for alteration signal by the permeate tuner morph. Moreover displaying a steeple alteration of the GDRL of the average in terms of the sway-tuner morph, and permeate dot tuner that was the a permeate value of the far alteration of the $Per-rm-FA-{\alpha}_{AVG}$ with $14.63{\pm}1.23units$, that was the a permeate value of the convenient alteration of the $Per-rm-CO-{\alpha}_{AVG}$ with $8.28{\pm}0.97units$, that was the a permeate value of the flank alteration of the $Per-rm-FL-{\alpha}_{AVG}$ with $3.28{\pm}0.58units$, that was the a permeate value of the vicinage alteration of the $Per-rm-VI-{\alpha}_{AVG}$ with $0.51{\pm}0.10units$. The sway tuner will be to evaluate at the steeple ability of the sway-tuner morph with character-dot by the permeate realization level on the GDRL that is displayed the gleam-differential morph by the realization level system. Sway realization system will be possible to control of a morph by the special signal and to use a permeate data of sway tuner level.

A Study on the Establishment of Management Criteria for Underwater Noise (수중소음 관리 기준 설정을 위한 소고)

  • Lim, Dae-Kyu;Shin, Young-Cheol;Jun, Yang-Bae
    • Explosives and Blasting
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    • v.28 no.2
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    • pp.119-132
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    • 2010
  • There are many dispute with a construction due to such environment problem as vibration and noise. Generally, we have a standard for acceptance level in land. But we have not a sufficient standard for acceptance level or guide line in underwater sound. In other countries, a acceptance level or guide line in underwater sound has been suggested. Especially the management criterion of underwater noise for fish has bee suggested using the measurement data (peak pressure, rms, energy and SEL) by a hydrophone. In Korea, there is no management criterion of underwater noise for fish. This study suggested the management criteria of underwater noise for fish based on the measured data by a hydrophone.

Determination Scheme of Variable Restricted Water Level during Flood Period of Multipurpose Dam (다목적 댐의 홍수기중 가변제한수위 결정 방안)

  • Gwon, O-Ik;Sim, Myeong-Pil
    • Journal of Korea Water Resources Association
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    • v.30 no.6
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    • pp.709-720
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    • 1997
  • When flood control storage lacks for the reservoir operation of multipurpose dams during flood period, the additional flood control storage should be considered for the flexible use of limited storage capacity. Flood period is divided by meteorological characteristics in this study and the water levels for water demand and flood control are investigated for the divided flood period. Based on the investigations, we suggest the variable restricted water level(VRWL) from the considerations of water conservation and flood control which can determine dam operating water level during flood period. This paper presents an application of the methodology to determination of the VRWL during flood period at the Taechong Dam and the results are discussed.

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