• 한국건설순환자원학회논문집
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• 제11권4호
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• pp.341-348
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• 2023

본 연구는 산업의 급성장으로 각종 산업부산물의 발생량이 크게 증대되고 천연골재 자원의 고갈 현상이 심화되는 것을 최소화 하기 위해 순환골재와 제강슬래그를 이용 재료시험 및 재생 콘크리트 적정 혼합 배합비를 도출하고자 하였다. 본 연구에서는 먼저 현장에서 사용되고 있는 재료의 품질기준 적합도를 확인 단독 및 혼합 사용할 경우 작업성, 성형에 맞는 결과를 나타내었다. 따라서 시멘트의 종류 및 혼화재, 굵은골재, 잔골재를 구분 총 4-TYPE 배합을 통해 콘크리트용 골재로 활용 가능성을 평가하였다. 실험 결과 치환율에 따른 굳지않은 콘크리트 슬럼프와 공기량, 염화물과 경화된 콘크리트 압축강도를 실험 결과는 일반적인 콘크리트 품질특성 측정값과 차이가 있음을 확인할 수 있었고, 또한 콘크리트용 순환골재 및 제강슬래그를 굵은골재 치환율에 따라 표준 설계기준 품질특성을 만족함을 확인할 수 있었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.233-238
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• 2002

In this paper, the characteristics of fresh and hardened recycled concrete were experimentally compared to investigate the applicability of the recycled fine aggregates with the substitution ratio. Test results show that the workability of the recycled concrete decreases with the increment of substitution ratio of the recycled fine aggregates except for type-D case which has a lower absorption ratio. Also air content was increased with increasing substitution ratio. It was found that the compressive strength and elastic modulus of recycled concrete were decreased with increasing substitution ratio of the recycled fine aggregates. And, the superplasticizer was more effective on the workability recovery of the recycled concrete.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.61-62
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• 2012

This study is for analyzing possibility of utilizing as cement from waste concrete. The scrapped fine powder which contains a large amount of hydrate of cement can supercede lime stone, and greenhouse gas reductions are expected. However, Fine Aggregate powder efficient separation technology development is essential for that limestone substitution effect and reduce greenhouse gas emissions in order to facilitate through the recycling of the scrapped fine powders.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.793-797
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• 2005

This study was undertaken to examine the feasibility of recycling waste concrete fine aggregate to prepare polymer-modified mortars. The specimens of polymer-modified mortars were prepared by using styrene-butadiene rubber(SBR) latex and polyacrylic ester(PAE) emulsion as a polymer modifier. The formulations for specimens were prepared with various replacing ratios of waste concrete fine aggregates as parts of standard sand and various polymer cement ratios. For the evaluation of the performance of polymer-modified mortars, various physical properties were investigated. As a results, water cement ratio of polymer-modified fresh mortars increased with an increase of recycled fine aggregate, but decreased with an increase of polymer modifiers. The compressive and flexural strengths of polymer-modified mortars decreased with an increase of recycled fine aggregate, but flexural strengths increased with an increase of polymer modifiers.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.116-119
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• 2003

The Natural aggregate will be faced with serious shortage problem within 10 years due to the great amount of consumption in domestic. In order to reserve our natural resources, the construction waste has to be reused as an alternative material. Especially, It is more imminent to find alternative material in case of fine aggregate. This paper presents and experimental results on the fundamental property of concrete using recycled fine aggregate. As a result, it was found that the property of concrete using recycled fine aggregate substituted for 25% of a natural sand was similar in that of crushed fine aggregate.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.78-79
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• 2013

A policy for recycling waste concrete has been extensively studied, but it is still lacking to recycle and reuse as a cementitious powder, and the property has big different depending on the aggregate rates. In this study, the amount of cement powder according to the internal properties of the aggregate were mixed. From as a result, Concrete Powder to play inside the aggregate composition of the cement composition CaO rigs that causes loss of power and strength reduction due to rising real water cement ratio will affect large.

• 한국도로학회논문집
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• 제12권4호
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• pp.111-120
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• 2010

본 연구는 준고온 공법을 이용한 재생 아스팔트 콘크리트의 강도특성을 평가하기 위해 이루어졌다. 굵은 골재 최대치수 13mm의 화강암과 침입도 60-80인 신규 바인더 60-80을 재생 혼합물을 제조하는데 사용하였다. 배합설계는 RAP(굵은 입자 : 잔입자=6 : 4) 첨가비율 20%와 30%를 사용하였고 GPC, 침입도, 절대점도, 동점도를 준고온 첨가제(Evotherm와 Sasobit)의 첨가 함량을 결정하기 위하여 측정하였다. LD(low-density poly ethylene)를 본 연구에서 준고온 재생 아스팔트 혼합물의 개질제로 사용하였다. 본 연구에서는 8개의 준고온 재생 혼합물(2 RAP함량 ${\times}$ 2 준고온 첨가제 ${\times}$ 2 개질제)뿐만 아니라 2개의 일반 재생 혼합물, 1개의 가열혼합 일반혼합물(control)까지 총 11개의 혼합물을 제조하였다. 변형강도 시험, 간접인장강도 시험, 수분민감성 시험, wheel tracking을 통한 소성변형 시험을 준고온 재생혼합물의 기본 특성을 평가하기 위하여 수행하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.368-371
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• 2004

It analyzes the quality of the fine aggregate which is reproduced through a dry production process with cyclone and a wet production process. The conclusions of the study are as follows. 1. The recycled fine aggregate through the dry production process with cyclone shows the low rate of absorption and impurity content after the cyclone process. It shows that its density is 2.37, absorption rate is 4.8 and stability is $5.1\%$ and less. Therefore, it satisfies the standards of KS F 2573(recycled aggregate for concrete) as the first grade. 2. The recycled fine aggregate through the wet production process shows the low rate of absorption and foreign substance content after the process of wash and dehydration. It shows that its density is 2.40, absorption rate is 3.12 and stability is $3.2\%$ and less. Therefore, it satisfies the standards of KS F 2573(recycled aggregate for concrete) as the first grade.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.101-104
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• 2006

This study aims to obtain technical data for improvement of utilization of Blast Furnace Slag(BFS), recycled aggregate in the future by complementing fundamental problems of BFS such as manifestation of initial strength and excessive alkali quantity as well as weakness of recycled fine aggregate through manufacturing of recycled fine aggregate mortar using BFS. Since hydroxide ion concentration of calcium hydroxide(Ca(OH)2) ion erupted from recycled fine aggregate newly produced is over 12. In recycled fine aggregate mortar transposing and using BFS powder, calcium hydroxide(Ca(OH)2) erupted from recycled fine aggregate played a role of stimulus from the day 3 and manifestation of compressive strength was slowly increased with mortar using natural fine aggregate and showed considerable increase from the day 7.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.399-400
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• 2010

본 연구에서는 순환재료를 사용한 그린 변형 경화형 시멘트 복합체의 압축, 휨 및 직접 인장거동 특성에 대하여 평가한다. 순환재료로 재생 PET 섬유, 플라이애쉬 및 폐콘크리트로부터 생산된 순환잔골재 등이 사용되었다. 실험결과, 5개의 덤벨형 인장 시험편의 직접 인장강도는 4.76MPa, 휨 및 압축강도는 7.40MPa 및 38MPa로 각각 평가되었다.