• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 춘계학술논문 발표대회
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• pp.141-145
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• 2007

The part in the structure that is most affected by changes of external temperature is the protective concrete layer that protects a waterproofing layer. Also, the waterproofing layer that is situated under or on the back of such a protective concrete layer is affected by temperature and the behavior of the protective concrete layer under the condition of consolidation or close adhesion. In particular, in many cases, the damage is serious mainly around the projection (such as a parapet), crack, and joint (expansion joint). However, there is no proper way of examining again the non-exposed waterproofing layer once it has been constructed. Therefore, there is an assessment only on the physical property of materials and the capability of the layer in construction, and there is no actual assessment in consideration of its environmental condition or the condition of the use of buildings after construction. Therefore, in order to create more pleasant buildings and to enhance the durability of structures, this study conducts research into the change of capability of non-exposed waterproofing material after the application of a static load and moving load on the waterproofing layer situated under or on the back of protective concrete.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 춘계 학술논문 발표대회
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• pp.167-168
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• 2017

With the recent increase in demand for construction there has been an increase in the use of the raw material cement when mixing concrete; managing quality of cement powder, therefore, is most important. Therefore this study sought at first to develop a rapid appraisal using the Hydrometer method researched previously, for it was thought that when suspending cement in a solution and applying the Hydrometer method to it the temperature changes in the solution would have a great effect on the density value of the Hydrometer method; yet there has been no report of such influence factors. Therefore after analyzing the influence factors that the type of suspending solution and changes in temperature could have on rapid appraisal of fineness, using the Hydrometer method, this study was able to determine that using water at 20℃ was the most appropriate, and with every temperature increase of 10℃ the value of fineness should also be increased above or below 7% as well.

• KIEAE Journal
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• 제6권3호
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• pp.43-48
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• 2006

This paper aims to suggest ways of institutionally improving standards that must be applied when installing Water Reclamation/Reuse (WRR) system based on efficiency analysis. Currently, the standard for WRR system establishment requires that the system should treat more than 10% of used water in the building of over $60,000m^2$ in total area of all floors, but our research has found that it would be more effective to change the standard to $150-m^3-per-day$ reclaimed water or the total area of all floors of $30,000m^2$ ($50,000m^2$ in the case of an office building). In other words, what this paper suggests is not a one-size-fits-all standard based on the total area of all floors, but a reasonable and flexible standard that takes into account efficiency and a unit water usage according to a building's purpose. Furthermore, this paper recommends a new WRR standard that can be applied to large-scale land development for housinglots, like the New Town. The recommendation is based on the economic analysis that the WRR system will ensure efficiency only if the amount of reclaimed water is over 4,000 tons per day, which corresponds to 4 millions square meters of housinglots. Regarding the size of the established facility, this paper suggests changing the standard, which is now set at over 10% of water usage, to what is relative to the total amount of use of reclaimed water in order to ensure efficiency and promote use of reclaimed water. In addition, this paper proposes that governmental support should be offered not only to facility owners, who are recipients at present, but also to facility builders. By doing so, those who donate a facility to the government, central or local, after building it, can be provided with substantial aid. Therefore, the application of the institutional improvement suggested in this paper is expected to create environment-friendly living conditions and boost the quality of life by encouraging people to secure water resources efficiently in buildings, and in a wider range, in cities.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.868-871
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• 2008

리모델링은 노후화, 진부화된 특정건물의 기존상태에서 노후화와 진부화를 극복한 새로운 상태로 변화시키는 건축행위이다. 또한 리모델링은 건축물의 물적 사용 연한을 증가시키기 위한 수단이기도 하지만 사용상의 변화 즉 사회요구변화, 용도변화, 기술의 발달 등의 변화에 대응하기 위한 방안이라고도 생각할 수 있다. 리모델링 공동주택의 성능평가는 우선 리모델링 전 후의 주택 성능과 상태를 파악한 후 그 차이를 비교하여 성능향상 정도를 객관적으로 나타낼 수 있어야 한다. 이에 본 연구는 공동주택의 리모델링 전후의 건축물 변화를 객관적으로 평가할 수 있는 평가체계를 제시할 목적으로 국내 외 및 일본의 성능평가 및 성능인증 제도를 비교 분석하여 리모델링 공동주택의 성능평가체계를 구축하고자 한다.

• 중소기업융합학회논문지
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• 제2권1호
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• pp.69-75
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• 2012

지구온난화 및 기후 변화에 따른 재난, 이상기온, 질병 등 각종 사회 문제들이 대두됨에 따라, 에너지 절감 및 효율화를 위한 기술 개발이 증대되고 있다. 주택, 상업건물, 공공 건물 분야에서 소비되는 에너지는 우리나라 전체 에너지 사용의 22%를 차지함에 따라, 건물에너지 절감은 전체 에너지 절감에서 매우 중요한 요소이며, 이를 위한 방안이 추진되고 있다. 기존의 건물에서는 에너지 효율화를 위해 열 손실에 대한 대책 마련 및 에너지 저소비형 장비 사용 등의 수동적 방법을 사용하였으나, 최근에는 ICT 기술과 융합하여 에너지 사용의 측정, 모니터링, 통제를 통해 지속적으로 에너지 낭비 요소를 감지 및 제거하는 방식의 건물 에너지 효율화를 위한 능동적 기술이 대두되고 있다. 에너지 효율화를 이용하여 에너지 절감 장비를 사용하더라도, 낭비 상황을 제어하지 않으면 실질적이고 지속적인 에너지 절감 효과를 달성하기 어렵게 된다. 이 논문에서는 국내외 건물 에너지 효율화를 위한 기술 개발 현황을 소개하고, 능동적 에너지 절감을 위한 이슈를 고찰한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1725-1730
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• 2004

The railroad station building is a public facility that many people use. The disabled persons cannot move as freely as the ordinary persons do, so the facility shall be considered on this matter. We reviewed on the features of the retarded, visually handicapped and mentally retarded persons upon moving, and calculated the minimum space required in their move, access and use of the reachable space, and we also analyzed the design factors so that the prior guidance can be considered for the visually handicapped such as installation of guidance facility, change of finishing material and Braille points block handrail to avoid obstacles for the use of senses of touch, hearing and remained eyesight of the visually handicapped. In addition, we also analyzed the requests of general design totally to analyze and arrange the design factors with the thought that the facility for the handicapped shall be useful for the ordinary people as well as the handicapped.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 추계 학술논문 발표대회
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• pp.53-54
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• 2014

This study evaluates engineering properties of mortar using lightweight fine aggregate made by bottom ash discharged air cooling process according to grading. Then we confirm possibility of use as lightweight fine aggregate. Consequently, Mix using bottom ash need additional examination for a change with the passage of time of flow. Also, mix of S indicates similar compressive strength with mix of Plain and 16% decrease of unit weight compared to mix of Plain; while mix of B indicates 10% decrease of compressive strength and 16% decrease of unit weight. Therefore, this study shows that mix of S and B is superior compared with other mix.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.102-103
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• 2016

Recently on construction sites, there is increased use of concrete with large quantities of blast-furnace slag(BS) admixture replacements, for purposes of reducing CO2 created from cement, one of the ingredients of concrete. But such high-BS fineness changes can have a huge effect on the quality of mortar and concrete. Therefore in this study an experiment was conducted in which liquidity and intensity of mortar depending on an artificially-applied change in fineness degree at degree 7. The results, though subtle, were that the larger the fineness degree, liquidity increased and air quantity decreased, and compression and flexural strength increased.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 가을 학술논문 발표대회
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• pp.193-194
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• 2022

The use of high-strength grout for facility foundations and bridges has recently been expanding in offshore wind farms. Offshore wind farms require a bearing capacity for horizontal loads such as wind, waves. Therefore, in this study, the strength of the high-strength grout discharged through pump pressure was measured and compared with the existing strength to secure the strength after the underwater pump pressure of the high-strength grout used in the offshore wind connection. The compressive strength measurement showed that the strength difference at each position of the core specimen was 1% higher than that of the other specimens, and there was almost no change in the strength according to the height. The strength of the core specimen decreased by 23% compared to the existing strength, which is similar to the result of this study because the strength of the core specimen decreased by approximately 25% compared to the general specimen according to related research. Therefore, it is believed that there is no decrease in strength due to underwater pumping.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.123-124
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• 2015

The project participants make use of floats for their benefits. The owner may consume floats in an event of issuing change order(s) and may avoid the risk factors attributed by them; the contractor may reduce activities' costs by substituting the activity with alternative construction method and by leveling the resources, hence consuming floats. There are a lot of disputes and claims involved in the float ownership issue. The ownership of floats should be stipulated in the contract stage. To alleviate these disputes and claims, it is commendable to develop a computational method that quantifies the float value. This paper presents the method that computes the values of total floats which changes over the project life span. The system calculates CPM, compute the ratio of area of banana curve which is enclosed by earliest start curve and latest start-curve.