• Title/Summary/Keyword: Aggregate resource

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A Study of the Strength and Durability Properties on Recycled Aggregate Concrete and Blain of Blast Furnace Slag (고로슬래그의 분말도 및 순환골재 치환율에 따른 콘크리트의 강도 및 내구적 특성에 관한 연구)

  • Lim, Myung-Kwan;Park, Moo-Young;Jung, Sang-Jin
    • Journal of the Korea Institute of Building Construction
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    • v.7 no.4
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    • pp.101-108
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    • 2007
  • Furnace slag powder used currently in Korea needs to add special functions in response to the increase of large-scale projects. In addition, it is advantageous in that it has a lower hydration heat emission rate than ordinary Portland cement and improves properties such as the inhibition of alkali aggregate reaction, watertightness, salt proofness, seawater resistance and chemical resistance. However, furnace slag powder is not self -hardening, and requires activators such as alkali for hydration. Accordingly, if recycled fine aggregate, from which calcium hydroxide is generated, and furnace slag, which requires alkali stimulation, are used together they play mutually complementary roles, so we expect to use the mixture as a resource-recycling construction material. Thus the present study purposed to examine the properties and characteristics of furnace slag powder and recycled aggregate, to manufacture recycled fine aggregate concrete using furnace slag and analyze its performance based on the results of an experiment, to provide materials on concrete using furnace slag as a cement additive and recycled fine aggregate as a substitute of aggregate, and ultimately to provide basic materials on the manufacturing of resource-recycled construction materials using binder and fine aggregate as recycled resources.

Engineering Characteristics of Resource-Cycling Mortar according to the Variation of Illite Replacement Ratio and Fine Aggregate Type (굵은골재 및 잔골재 조합변화가 초고강도 콘크리트의 기초적 특성에 미치는 영향)

  • Lee, Sun-Jae;Song, Yuan-Lou;Yun, Jeong-Wan;Han, Dong-Yeop;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.61-62
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    • 2015
  • This study has analyzed the engineering characteristics of resource-cycling mortar according to the variation of fine aggregate type using illite with high development potentials by setting the goal as developing eco-friendly construction materials. As a result, while flow has increased if recycled fine aggregate and waste refractory are used separately or mixing them adequately in case of flow and compressive strength, the flow had somewhat declined followed by illite replacement. However, the possibility of such usage is determined to be adequate if used by mixing illite, recycled fine aggregate and waste refractory properly due to the dry shrinkage effect.

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Development of High quality Recycled Aggregate Production Process from Waste Concrete for Resource Circulation System (자원순환형(資源循環型) 사회(社會) 구축(構築)을 위한 고품질(高品質) 순환골재(循環骨材) 생산(生産) 공정(工程) 개발(開發) 연구(硏究))

  • Kim, Kwan-Ho;Cho, Hee-Chan;Ahn, Ji-Whan
    • Resources Recycling
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    • v.18 no.3
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    • pp.27-35
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    • 2009
  • To solve resource exhaustion and waste management problems caused by mass consumption, there are many efforts to change from resource consumption system to recycling system. Specially, interests about management of construction waste have increased, but efficient recycling system of waste concrete is not established yet. In this study, high quality recycled aggregate processing circuit was developed to recycle waste concrete. From the waste concrete which is a hydrated compound with coarse aggregate, fine aggregate, and cement material, high quality recycled coarse aggregate for concrete making was produced by autogenous milling and heat pretreatment method. After then, refinement process was performed to separate fine aggregate and cement material from waste concrete fines by sink float separation and hindered-settling separation. As a result, high quality recycled aggregate was produced from waste concrete by developed processing circuit.

Engineering Characteristics of Resource-Cycling Mortar according to the Variation of Illite Replacement Ratio and Fine Aggregate Type (일라이트 치환률 및 잔골재 종류 변화에 따른 자원순환형 모르타르의 공학적 특성)

  • Kim, Min-Yoyng;Song, Yuan-Lou;Kim, Sang-Sup;Yoon, Won-Geun;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.46-47
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    • 2015
  • This study has analyzed the engineering characteristics of resource-cycling mortar according to the variation of fine aggregate type using illite with high development potentials by setting the goal as developing eco-friendly construction materials. As a result, while flow has increased if recycled fine aggregate and waste refractory are used separately or mixing them adequately in case of flow and compressive strength, the flow had somewhat declined followed by illite replacement. However, the possibility of such usage is determined to be adequate if used by mixing illite, recycled fine aggregate and waste refractory properly due to the dry shrinkage effect.

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A Study on Application of Dyeing Industrial Heat Source Waste Aggregate as Concrete Aggregate (콘크리트용 굵은 골재로서 염색공단 열원 폐재의 적용성에 관한 연구)

  • Youn, Jang-Kil;Kim, Hyo-Youl;Lim, Nam-Gi
    • Journal of the Korea Institute of Building Construction
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    • v.5 no.1 s.15
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    • pp.123-129
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    • 2005
  • This study is as a part of the new disposal and recycling plans of heat-resource waste of Daegu dyeing industrial center we tried to examine applicable possibility of crushed thing(waste aggregate) as aggregates for mortar and concrete. To examine applicable possibility of waste aggregate as a lightweight-aggregate for concrete and mortar, we carried this study by mainly property examination of concrete according to replacement ratio of waste aggregate. We carried slump, unit weight, compressive strength and bending strength test according to replacement ratio of waste aggregate. As the result of that, if we use waste aggregate, lightweight of concrete and mortar will be possible. Specially it shows a strength improvement effect of cement hardening according to using this so it is judged that applicable possibility as aggregate for concrete and mortar is very excellent.

The Study on Application of a Heat annexation power plant Source Waste Aggregate as Concrete Aggregate (열병합발전소의 열원폐자재를 골재로 활용한 콘크리트특성에 관한 연구)

  • Lee Myoung-Hyol;Kim Hyo-Youl;Lim Nam-Gi
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2005.05a
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    • pp.99-104
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    • 2005
  • This study is as a part of the new disposal and recycling plans of heat-resource waste of Daegu dyeing, industrial center we tried to examine applicable possibility of crushed thing(waste aggregate) as aggregates for mortar and concrete. To examine applicable possibility of waste aggregate as a lightweight-aggregate for concrete and mortar, we carried this study by mainly property examination of concrete according to replacement ratio of waste aggregate. We carried slump, unit weight, compressive strength and bending strength test according to replacement ratio of waste aggregate. As the result of that, if we use waste aggregate, lightweight of concrete and mortar will be possible. Specially it shows a strength improvement effect of cement hardening according to using this so it is judged that applicable possibility as aggregate for concrete and mortar is very excellent.

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An Experimental Study on the Mechanical Properties of Concrete with the Contents of Recycled coarse Aggregate (재생 굵은 골재를 사용한 재생 콘크리트의 역학적 특성에 관한 실험적 연구)

  • 김호수;백철우;반성수;최성우;류득현
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.25-30
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    • 2003
  • Owing to the deterioration of reconstruction and the construction, much of the construction waste is discharged in our construction field. By supplementing aggregate resources that are insufficient by recycling waste concrete, it is considered that the resource-preserving effect according to the saving and reuse of resource as well as eco-friendly effect that is regarded as important in recent industrial society may be expected. In this study conducted an experiment by setting up 15 levels according to the variations in the rate of substitution of recycled coarse aggregate by the water cement ratio(40, 50, 60%). As the result of it, the slump and air contents was increased by ratio of coarse aggregate, and the elapsed characteristics by the ratio of recycled coarse aggregate showed that there is no clear difference in slump and the air contents. Further, in the characteristics of strength development, the lower the water cement ratio, the higher the compressive strength at early ages, compared with crushed stone, while the compression declined according to the increase of substitution rate of recycled gravel as it was tending upward long-term ages.

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Study on the Strength Characteristics of Spun-Concrete Used Recycled Aggregate (순환골재를 사용한 원심력 콘크리트의 강도특성 연구)

  • Sim, Jong-Sung;Park, Choel-Woo;Park, Sung-Jae;Kim, Yong-Jae;Kim, Kil-Jung
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.165-168
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    • 2004
  • Due to the demolition of old structures, primarily buildings, an amount of discharged construction wastes are increased. From the construction wastes, recycled aggregate can be used as a useful resource for concrete. However, its application to structural member is very limited. In this experimental study, the compressive strength of spun-concrete using recycled aggregate was investigated. Coarse aggregate was replaced with $100\%$ of the recycled coarse aggregate, and recycled fine aggregate was replaced with various amount. According to the test results, the specimen of spun-concrete showed uniform compressive strength regardless the amount of replaced recycled fine aggregate.

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Effect of high temperature on the bond performance between steel bars and recycled aggregate concrete

  • Yan, Lan-Lan;Liang, Jiong-Feng;Zhao, Yan-gang
    • Computers and Concrete
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    • v.23 no.3
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    • pp.155-160
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    • 2019
  • The use of recycled aggregate concrete for the purpose of environmental and resource conservation has gained increasing interest in construction engineering. Nevertheless, few studies have reported on the bonding performance of the bars in recycled aggregate concrete after exposed to high temperatures. In this paper, 72 pull-out specimens and 36 cubic specimens with different recycled coarse aggregate content (i.e., 0%, 50%,100%) were cast to evaluate the bond behavior between recycled aggregate concrete and steel bar after various temperatures ($20^{\circ}C$, $200^{\circ}C$, $400^{\circ}C$, $600^{\circ}C$). The results show that the recycled aggregate concrete pull-out specimens exhibited similar bond stress-slip curves at both ambient and high temperature. The bond strength declined gradually with the increase of the temperature. On the basis of a regression analysis of the experimental data, a revised bond strength mode and peak slip ratios relationship model were proposed to predict the post-heating bond-slip behavior between recycled aggregate concrete and steel bar.