• Title, Summary, Keyword: rapid-chilled steel slag

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Experimental Study on the Properties of Recycled Concrete using Recycled Coarse Aggregates and Steel Slag Fine Aggregates (재생 굵은골재와 제강슬래그 잔골재를 사용한 재생 콘크리트의 특성에 관한 실험적 연구)

  • Lee, Jaesung;Na, Okpin
    • Journal of the Korean Institute of Resources Recycling
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    • v.24 no.5
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    • pp.63-71
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    • 2015
  • The purpose of this study is to investigate the optimum replacement rate and material properties of eco-friendly recycled concrete using recycled coarse aggregates and rapid-chilled steel slag fine aggregates. The replacement rate of recycled coarse aggregates was increased from 30% to 50% of total volume of coarse aggregates and the rapid-chilled steel slag aggregates were substituted for 10% to 50% of total volume of fine aggregates. As a result, the increment of recycled coarse aggregates in concrete caused the reduction of the compressive strength. On the other hand, as increasing the replacement ratio of rapid chilled steel slag aggregates, the compressive strength was enhanced. Furthermore, the optimum use of rapid chilled steel slag aggregates was suggested up to 20~30% of fine aggregates and the use of it could be helpful to expand the replacement rate of recycled aggregates.

Characteristics of EVA-Polymer Modified Mortars Recycling Rapid-chilled Steel Slag Fine Aggregate (급냉 제강슬래그를 재활용한 EVA-폴리머 시멘트 모르타르의 특성)

  • Hwang, Eui-Hwan;Kim, Jin-Man
    • Applied Chemistry for Engineering
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    • v.19 no.6
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    • pp.652-660
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    • 2008
  • For the recycling of rapid-chilled steel slag, the mechanical strengths and physical properties of EVA-polymer modified mortars with the various replacement ratios of rapid-chilled steel slag were investigated. Twenty five specimens of polymer modified mortars were prepared with the five different amounts of EVA-polymer modifier (0, 5, 10, 15, 20 wt%) and rapid-chilled steel slag (0, 25, 50, 75, 100 wt%). For the investigation of the characteristics of polymer modified mortars, the measurements such as water-cement ratio, unit volume weight, air content for fresh mortar and compressive strength, flexural strength, water absorption, hot water resistance, porosity and SEM investigation for curing specimens were conducted. As a results, with an increase in the replacement ratio of rapid-chilled steel slag, water-cement ratios decreased but unit volume weight increased remarkably. With increasing EVA-polymer modifier and the replacement ratio of rapid-chilled steel slag, percent of water absorption decreased but compressive and flexural strengths increased remarkably. By the hot water resistance test, mechanical strengths decreased but total pore volume and porosity increased remarkably. In the SEM observation, the components of specimen were shown to stick to each other in the form of co-matrix phase before hot water resistance test, but polymer modifier of co-matrix phase was decomposed or deteriorated after hot water resistance test.

An Experimental Study on the Properties of Concrete Substituting the Rapid Chilled Steel Slag for Fine Aggregate (잔골재를 급냉제강(急冷製鋼)슬래그로 대체(代替)한 콘크리트의 특성(特性)에 관(關)한 실험적(實驗的) 연구(硏究))

  • Kim, Nam-Wook;Park, Min-Wook;Bae, Ju-Seong
    • Journal of the Korean Institute of Resources Recycling
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    • v.17 no.1
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    • pp.73-79
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    • 2008
  • Along with the increased social infrastructures and reconstruction, the demand for aggregate, which is used in concrete, has rapidly increased. However, there are problems due to the exhaustion of natural aggregate resources, and strict restrictions. In this study, the possibility of using rapid chilled steel slag as a substitutive material of fine aggregate is determined from the property test and mechanical test for the concrete that is made with rapid chilled steel slag, which highly decreases the free CaO, the main problem of the steel slag.

Experimental Study on the Characteristics of Rapid Chilled Converter Slag by Watering

  • Lee, Keun-Jae;Yoo, Seung-Yeup;Koo, Ja-Sul;Cho, Bong-Suk;Lee, Hoon-Ha
    • International Journal of Concrete Structures and Materials
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    • v.5 no.2
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    • pp.133-137
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    • 2011
  • In this study, a physical and chemical properties analysis was conducted for PCSP to evaluate properties of its materials and, for comparison purpose, was also conducted for CSP. The result of experiment confirmed improvement of iron recovery rate due to introduction of rapid water-cooling equipment and greater density of exterior and interior structure through SEM observation and porosity measurement. Also, SEM, XRD and DSC-TGA analysis showed that content of f-CaO in PCSP was minuscule so it was decided that problems of material stability including f-CaO-caused bulging failure, which has been problematic, can be solved.

Development of Concrete and Evaluation of Properties of Combined Steel making Slag Aggregates for Offshore Structure Production(II) (해양구조물 제조를 위한 제강슬래그 골재 조합별 물성평가 및 콘크리트 개발(II))

  • Jung, Won-Kyong;Kim, Hyun-Seok;Park, Dong-Cheon;Cho, Bong-Suk
    • Journal of the Korean Institute of Resources Recycling
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    • v.25 no.2
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    • pp.60-68
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    • 2016
  • In this study, earlier analyzed tetrapod, one of an original group of offshore constructions studied for manufacturability of the concrete using the properties of steel making slag aggregate. steel making slag aggregate assessment, RCS and Blast Furnace Slag : the 20 mm air-cooled slag and combinations by 50 %, aggregate properties on the most appropriate for the properties of recycled aggregate concrete optimal mix, and assessing it. Properties of concrete used to be derived are judged as to bury the studies show that the hollowing-out of the RCS, plastic sole use is in the workability of the aggregate, plastic in the 20 mm slag also assessed to be a slight disadvantage, but RCS by mixing air-cooled coarse and 50 percent to 20 percent 50 mm. Thus, steel making slag marine structures using recycled aggregate, in rapid chilled slag or air-cooled slag. The sole use of the aggregate them than to combine the aggregate of concrete. After they satisfy the quality standard quality shall be used will aggregate steel making slag who meet the criteria concrete manufacturing in general or par with the aggregate of concrete. Performance was assessed as to develop a more than that.