• Smart Structures and Systems
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• 제22권4호
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• pp.433-440
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• 2018

Pavements porous concrete is a noble structure design in the urban management development generally enabling water to be permeated within its structure. It has also capable in the same time to cater dynamic loading. During the technology development, the quality and quantity of waste materials have led to a waste disposal crisis. Using recycled materials (secondary) instead of virgin ones (primary) have reduced landfill pressure and extraction demanding. This study has reviewed the waste materials (Recycled crushed glass (RCG), Steel slag, Steel fiber, Tires, Plastics, Recycled asphalt) used in the pavement porous concretes and report their respective mechanical, durability and permeability functions. Waste material usage in the partial cement replacement will cause the concrete production cost to be reduced; also, the concretes' mechanical features have slightly affected to eliminate the disposal waste materials defects and to use cement in Portland cement (PC) production. While the cement has been replaced by different industrial wastes, the compressive strength, flexural strength, split tensile strength and different PC permeability mixes have depended on the waste materials' type applied in PC production.

• 자원리싸이클링
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• 제10권1호
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• pp.16-24
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• 2001

본 연구는 재생골재를 콘크리트의 구조체로 이용하기 위한 기본적인 공학적 특성을 고찰하는데 목적이 있다. 구조체의 일부로 사용할 경우 내구성과 인성, 특히 강도에 문제가 발생하므로 혼합 물질간의 최적배합비를 산출할 필요성이 있고, 원콘크리트의 물성과 생산방법에 따라 공학적 특성이 다르므로 원콘크리트에 대한 데이터베이스와 생산방법의 차이에 따른 재생골재의 역학특성을 제고할 필요가 있다. 따라서, 본 연구는 콘크리트 구조체의 한 구성원으로 사용된 재생골재의 성분을 물리적 ·화학적 방법을 통해 분석한 후, 총 2계열의 콘크리트 공시체를 제작하여 압축강도를 비롯한 여러 실험값을 산출하여 그 상관관계를 연구하였다. 본 연구결과는 재생골재를 사용한 구조체의 해석, 설계 및 시공에서 기초자료로 활용될 수 있을 것으로 사료된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1996년도 가을 학술발표회 논문집
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• pp.31-36
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• 1996

Various strength characteristics of recycled concretes containing different contents of recycled aggregates from waste concretes were compared with one another. Five different contents. 0%, 50%, 60%, 70% and 80%, of recycled concrete were used for this study. Study results showed that the compressive strength, flexural strength, tensile strength, elastic modulus and fracture toughness varied with contents of recycled aggregates. Target strength of the recycled concrete could be difined by nonparametric regression model as a funcion of content of recycled aggregate in the mix.

• Advances in concrete construction
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• 제9권5호
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• pp.479-489
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• 2020

Studies have proved that the mechanical properties of concrete, suddenly is dropped off with employing waste materials as replacements. The effectiveness of fibre addition on the structural stability of concrete has been indicated in recent investigations. There are different waste aggregates and fibres as plastic, rubber tire, coconut, and other natural wastes, which have been evaluated throughout the last decades. The fibres incorporation has a substantial effect on the properties of concrete mix subjected to different loading scenarios. This paper has reviewed different types of wastes and the effect of typical fibres including Poly Ethylene Terephthalate (PET), rubber tire, and waste glass. Furthermore, waste plastic and waste rubber has been especially studied in this review. Although concretes containing PET fibre revealed a reduction in compressive strength at low fibre fractions, using PET is resulted to micro-cracking decrement and increasing flexibility and flexural strength. Finally, according to the reviews, the conventional waste fibres are well-suited to mitigated time-induced damages of concrete and waste fibres and aggregates could be a reliable replacement for concrete.

• Advances in concrete construction
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• 제2권3호
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• pp.193-207
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• 2014

The study presented herein aims to investigate the durability related properties of rubberized concrete. Two types of waste scrap tire rubber were used as fine and coarse aggregate, respectively. The rubber was replaced with aggregate by three crumb rubber and tire chips levels of 5, 15, and 25% for the rubberized concrete productions. In order to improve the transport properties and corrosion resistance of rubberized concretes, SF was replaced with cement at 10% replacement level by weight of total binder content. The transport properties of the rubberized concretes were investigated through water absorption, gas permeability, and water permeability tests. The corrosion behavior of reinforcing bars embedded in plain and silica fume based rubberized concretes was investigated by linear polarization resistance (LPR) test. The results indicated that the utilization of SF in the rubberized concrete production enhanced the corrosion behavior and decreased corrosion current density values. Moreover, the reduction in the water and gas permeability coefficients was observed by the incorporation of SF in plain and especially rubberized concretes.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.94-97
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• 2003

Recently, owing to the deterioration of reconstruction and the construction, much of the construction waste is discharged in our construction field, and the amount of construction waste are rapidly increased. These waste are raised to financial and environmental problems, so the method of reusing waste concretes has been studied and carried out many direction. Especially being want of resources, if waste concrete could be recycled as aggregate for concrete, it will contribute to solve the exhaustion of natural aggregate, in terms of saving resources and protecting environment. This study is that the floating properties of concrete with recycled coarse aggregate were investigated for the substitution of recycled coarse aggregate. The result of this study, in case of water reducing, the property of harden concrete for the substitution ratio of recycled coarse aggregate was increased. The Quality of recycled coarse aggregate concrete was improved by water reducing.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.223-228
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• 2003

Recently, owing to the deterioration of reconstruction and the construction, much of the construction waste is discharged in our construction field, and the amount of construction waste is rapidly increased. These waste are raised to financial and environmental problems, so the method of reusing waste concretes has been studied and carried out many direction. Especially being want of resources, if waste concrete could be recycled as aggregates for concrete, it will contribute to solve the exhaustion of natural aggregate, in terms of saving resources and protecting environment. This study is that the mechanical properties of concrete with recycled coarse aggregate were investigated for types of mineral admixture and the substitution of recycled coarse aggregate. The result of this study, in case of using mineral admixture, the property of fresh concrete was rised. And the property of harden concrete for the substitution ratio of recycled coarse aggregate was decreased. But the property of concrete with mineral admixture was better than that of concrete used only cement.

• Composites Research
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• 제17권2호
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• pp.21-27
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• 2004

본 논문에서는 화학처리된 페 페인트와 페 스티로폼을 사용한 폴리머 콘크리트를 제작하고 그 기계적 특성을 평가하였다. 또한 골재와 수지재의 조성비 변화에 따른 압축강도, 비중, 흡수율 등을 평가하였다. 실험결과로부터 페 페인트를 사용한 폴리머 콘크리트의 비중은 기존의 폴리머 콘크리트 보다 낮은 값을 가지며, 건축용 외장재로 사용할 수 있을 것으로 판단되었다.

• 한국세라믹학회지
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• 제42권2호
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• pp.99-103
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• 2005

현재 국내에서 많은 양의 도자기 폐기물이 발생하고 있으며, 이들 폐기물은 경제적 이득과 환경 보전의 차원에서 재활용하는 방안이 모색되어져야 한다. 따라서, 본 연구에서는 도자기 폐기물을 콘크리트용 골재로 이용하여 폐도자기의 재활용성을 검증하고자 하였다. 폐도자기 재활용 골재(recycled aggregate)의 품질을 부순 골재(crushed aggregate)와 비교 분석하였으며, 부순 골재 단독 콘크리트와 재활용 골재가 비례대로 치환된 콘크리트의 물리적 특성을 비교 분석하였다. 실험 결과 재활용 폐도자기의 비율이 $10\%,\;20\%$, 그리고 $30\%$까지는 압축강도에 작은 영향을 미쳤지만, 재활용 폐도자기의 비율이 $30\%$ 이상 증가할수록 압축강도는 급격히 감소하였으며, 홉수율은 증가하였다. 실험 결과에 따르면, 일정한 압축강도를 지니는 폐도자기 재활용 콘크리트의 제조를 위해서 대체 가능한 재활용 골재의 최대 함량은 $30\%$임을 확인 할 수 있었다.

• Computers and Concrete
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• 제18권5호
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• pp.969-982
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• 2016

This paper investigates the compressive fatigue behaviour of polypropylene fibre reinforced self compacting concrete with Granite Sawing Waste (GSW). An experimental programme was conducted to obtain the fatigue lives of fibre reinforced self compacting concrete (FRSCC) at various stress levels. The stress ratio was kept constant as 0.3. Compressive fatigue test was conducted on 60 cubic specimens with 100mm edge length and 0.1% of polypropylene fibres at a frequency of 0.05Hz. The test results indicate that the fatigue lives of concretes containing granite sawing waste follow the double-parameter Weibull distribution. The fatigue strength equations have been developed based on different probabilities of failure.