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굵은골재 중 토분이 콘크리트의 기초적 특성에 미치는 영향
신세준 ( Sin Se-jun ),이제현 ( Lee Jea-hyeon ),박경택 ( Park Kyung-teak ),박민용 ( Park Min-yong ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
As the aggregate supply and demand shortages in Korea due to the lack of aggregates due to the regulation of production and use conditions of domestic aggregate collectors, the media recently pointed out the distribution of so-called bad aggregates containing soil powder. Such poor aggregates have a high self-absorption rate according to the reference, etc., leading to a decrease in the fluidity of the concrete. Therefore, in order to secure fluidity, the unit quantity increases greatly from 30 kg/㎥ to 55 kg/㎥, and the increased unit yield eventually leads to a decrease in compressive strength, resulting in a decrease in strength from about 35 % to 45 % compared to general aggregates. It indicates that there is a risk of shortening the life of the structure. Therefore, this study aims to analyze the effect of aggregate soil on concrete.
골재 토분이 고강도 모르타르의 기초적 특성에 미치는 영향
신세준 ( Sin Se-jun ),한준희 ( Han Jun-hui ),현승용 ( Hyun Seung-yong ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
본 연구에서는 선별파쇄 골재 등 부순 골재에 포함된 토분함유량 규정치를 정하는 연구의 일환으로써 골재 토분이 모르타르의 기초적 특성에 미치는 영향을 분석하였다. 토분함유량이 증가할수록 유동성과 휨강도는 감소하고, 공기량은 증가하며 압축강도는 1 % 전후에서 증가하는 경향도 나타났으나 전반적으로 감소하였다.
잔골재 중 토분이 모르타르의 기초적 특성에 미치는 영향
신세준 ( Sin Se-jun ),이제현 ( Lee Jea-hyeon ),박경택 ( Park Kyung-teak ),박민용 ( Park Min-yong ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
Recently, the supply and demand of aggregates has become difficult due to various practical constraints such as depletion of natural aggregate resources and tightening environmental regulations. As a result, aggregates such as selective crushed aggregates and river aggregates are now distributed to the construction market. In particular, among the aggregates distributed in the country, selective crushed aggregates that have been used recently are characterized by the fact that the quality of the raw material is not uniform and is based on geological characteristics. Such bad aggregates can affect the overall performance of the concrete and shorten the life of the structure. Therefore, in this study, in order to improve such problems, we want to analyze the effect of aggregate powder on mortar.
CGS를 잔골재로 사용하는 고강도 콘크리트의 역학적 특성
신세준 ( Sin Se-jun ),이혁주 ( Lee Hyuk-ju ),현승용 ( Hyun Seung-yong ),한민철 ( Han Min-cheol ),한천구 ( Han Choen-goo ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
In this study, as series of studies to provide how to apply coal gasification slag(CGS) as one of byproducts for high strength concrete, from a newly introduced power generation method in Korea, the possibility of using a mixed aggregate with 25 percent of CGS as a concrete residual were investigated. The results indicated that the compressive strength of concrete using CGS at early age was lower than that using CS, but compressive strength at 28 days showed similar levels of strength enhancement.
개량형 Durometer를 이용한 콘크리트의 응결시간 추정 가능성 분석
신세준 ( Sin Se-jun ),한수환 ( Han Soo-hwan ),현승용 ( Hyun Seung-yong ),김종 ( Kim Jong ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
The purpose of this study is to explore the possibility of estimating optimum surface finish time of the fresh concrete placed at the job site by applying a surface hardness test meter(Durometer). Tests are carried out by measuring and comparing the Penetration resistance test and hardness test by Durometer. Penetration resistance tester and improved Durometer are similar, but the higher the temperature, the higher the setting time, and the higher the correlation was shown. When the hardness value of the improved Durometer is about 50 HD, it is found that the initial and 80 HD represent the end. It is expected that this will be useful in determining the finish time of the surface at the actual site.