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부순모래를 사용한 콘크리트의 현장 품질 특성에 관한 실험 연구
이성복,이도헌,지남용,Lee, Sung-Bok,Lee, Do-Heon,Jee, Nam-Yong 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.3
This study is to investigate the properties of concrete with crushed sand on site and to propose a quality guideline for its use as artificial sand and concrete. From our experimental result in laboratory and site, we found that demand water of concrete with crushed sand for target slump increased by 18kg/m3 compared to mixed sand and l8kg/m3 compared to sea sand respectively. The compressive strength increased by around 3∼6% when compared to concrete with sea sand. Accordingly, our study showed that the combined sand mixed with sea sand would be desirable to obtain workability and strength of concrete including dry shrinkage and bleeding test. Furthermore, the optimal replacement percentage of crushed sand was 50% with sea sand. As such, crushed sand would be sufficient as fine aggregate for concrete in terms of economic efficiency and quality. Crushed sand, on the other hand can only be used as fine aggregate when VFS(Very Fine Sand) is below 3.5 percentage of weight of sand and particle shape is above 55 percentage. Also, the particle shape and microsand passing NO.200 sieve should continually be improved to increase workability of concrete on site.
고로슬래그미분말을 혼입한 고유동콘크리트에서 골재조합이 콘크리트 유동성상에 미치는 영향에 관한 실험 연구
김재훈,윤상천,지남용,Kim, Jae-Hun,Yoon, Sang-Chun,Jee, Nam-Yong 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.4
The purpose of study is to offer base data for high fluid concrete mix property, as grasp effect of aggregate to reach much more effect for producing high fluid concrete. For this study, there are three types of combined aggregates, river sand + river aggregate(type A), river sand + crusted aggregate(type B), washed sea sand + crushed aggregate(type C) and take a factor, water-contents, water-binder ratio and S/a. And so, we had following conclusion, resulting application-ability of high fluid mortar by K-slump tester to use a handy consistency measuring instrument. And so, we had following conclusion, resulting application-ability of high fluid concrete by K-slump tester to use a handy consistency measuring instrument. 1) In cafe of regular water binder ratio, high fluid concrete suffered much effect of combined aggregates and water binder ratio. Range of water binder ratio by combined aggregates is w/b 0.4 downward(type A and B), w/b 0.35 downward(type C). 2) Water contents to need for producing high fluid concrete is minimum 170kg/$\textrm{m}^3$ without regard to combined aggregates. 3) The effect of S/a on high fluid concrete by combined aggregates is approximately S/a 50% (type A and B), s/a 50-55% (type C). 4) Consistency measuring of high fluid concrete by K-slump tester is possible and first indication value, high fluid concrete can be produced, is 6~10.5cm.
고로슬래그 미분말을 함유한 고유동 모르터의 유동성상에 미치는 영향 요인에 관한 연구
김재훈,윤상천,지남용,Kim, Jae-Hun,Yoon, Sang-Chun,Jee, Nam-Yong 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.4
High fluid concrete unlike OPC concrete is made with various material, and the phase of fresh concrete is considerably different. In order to understand fluidity phase and mix properties of high fluid concrete, concrete is required to access as suspension structure which consists of aggregate and paste. The focus of this paper is to analyze the test results and quantify the effect of mix proportions of mortar and fineness modulus of sand on the properties of fresh mortar. The effect of water-binder ratio. sand-binder ration. contents of ggbs (by mass of total cementitious materials). and various contents of water reducing agent on the yield stress and plastic viscosity of the mix is studied. Based on the experimental results, the fellowing conclusions can be drawn: (1) The mixing time needed for high fluid mortar was approximately two times more than that of ordinary portland mortar. (2) The fluidity phase of mortar could be explained by yield stress of mix and the fluidity of mortar. (3) As the content of ggbs increased, yield stress of mortar was decreased and plastic viscosity of it was increased. (4) For the high fluid mortar, it was appeared that sand-binder ratio should be below 1.5.
무량판 공동주택의 경량 건식벽체 적용을 통한 건설폐기물량 저감 방안에 관한 연구
장주환(Jang, Joo-Hwan),지남용(Jee, Nam-Yong),노승엽(Roh, Seung-Yup) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.5
The apartment housing structure system which organizes main stream of domestic dwelling pattern has developed and been changed variously according to the periodical changes. At the early stage of apartment instruction, it was the rahmen structure to apply a masonry wall but at present, reinforced concrete bearing wall method organizes the main stream. The reinforced concrete bearing wall method had strength that construction know-how has been accumulated, but shows weakness that it was restricted by remodeling and could not respond the needs of customer seeking a changeability of plane properly. Recently, the apartment housing of RC bearing wall method shows social problems because its average life span was 30~35 years on being early reconstruction by the early deterioration. Because of the reconstruction caused by various needs of customers and early deterioration, it was increases lots of construction waste, CO2 emission, etc. So, this study intends to select the site applying RC bearing wall method and extruded concrete panels method among the current sites of apartment housing, analyzed quantity of construction waste, and it calculated the dealing cost and CO2 emission by construction wastes. Therefore, it analyzed the effect of the reduction of construction wastes by applying the extruded concrete panels in an flat plate apartment housing construction.