• Title/Summary/Keyword: isothermal conduction calorimetry

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The Characteristics of Isothermal Conduction Calorimetry and Specific Heat in Coal Gasification Slag (석탄 가스화 용융 슬래그의 비열 및 미소수화열 특성)

  • Han, Jun-Hui;Hu, Yun-Yao;Lim, Gun-Su;Kim, Su-Hoo;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.182-183
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    • 2021
  • In this study, This is the result of thermal characteristics analysis to suggest an efficient method of using coal gasification slag(CGS) of byproduct from integrated gasification combined cycle(IGCC). In Specific Heat characteristics, CGS and CS showed similar values. Isothermal Conduction Calorimetry showed that the hydration reaction of cement was retarded when CGS was used. Therefore, it is expected that CGS will be used as an efficient alternative to reducing the hydration heat of mass concrete as a functional aggregate combination.

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Isothermal Conduction Calorimetry Analysis of Alkali Activated Slag Binder (알칼리 활성 슬래그 결합재의 미소수화열 분석)

  • Choi, Young-Cheol;Cho, Hyun-Woo;Oh, Sung-Woo;Moon, Gyu-Don
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.3 no.3
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    • pp.237-243
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    • 2015
  • In this research, isothermal conduction calorimetry analysis has been conducted to investigate the reactivity of alkali activated slag binders. In order to secure the reactivity and workability of alkali activated slag binders, experiences with various types and concentrations of alkali activators were performed. Isothermal conduction calorimetry were measured with different alkali activators and mass ratio of $SO_3$ to binders as variables, and sodium tripolyphosphate ($Na_2P_3O_{10}$) and hydrated sodium borate ($Na_2B_4O_710H_2O$) were used to control setting time. As a results, alkali activated slag binders required alkali activators with 4 to 5 percent of concentration to accelerate the formation of calcium silicate hydrate(C-S-H) by alkali-activation, and overall heat generation rate delayed as accumulated heat decreased due to the high $SO_3$ contents. Moreover, the use of hydrated sodium borate as setting retarder causes elongated setting time due to delaying heat generation, so it can be considered that setting retarder played an important role in delaying total heat generation rate.

Study on Burnability and Reactivity of High Al2O3 Content OPC Clinker for the Use of Industrial Waste (산업부산물 활용을 위한 고Al2O3 함량 OPC 클링커의 소성성 및 반응성에 관한 연구)

  • Kang, Bong-Hee;Choi, Jaewon;Ki, Tae-Kyoung;Kwon, Sang-Jin;Kim, Gyu-Yong
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.8 no.3
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    • pp.294-301
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    • 2020
  • This study evaluated the burnability and hydration reaction of clinker burned with high Al2O3 content OPC to apply large amounts of industrial by-products in the cement manufacturing process. Specifically, after preparing a clinker with a high C3A content by burning the OPC raw material with a high content of Al2O3 in a laboratory electric furnace, the burnability of the clinker was evaluated through XRD Rietveld analysis and polarization microscopy, and clinker hydration reactivity was reviewed through the Isothermal conduction calorimetry analysis and the cement compressive strength. As a result, the kiln burning temperature for the production of high Al2O3 content clinker lower, and the compressive strength was equal to or higher than OPC. Therefore it was confirmed the possibility to manufacturing energy-saving high Al2O3 content clinker using a large amount of industrial by-products.

Effect of Nano-sized Calcium-silicate-hydrate (C-S-H) Crystals on Cement Hydration (나노 크기 칼슘-실리케이트-하이드레이트(C-S-H) 결정이 시멘트 수화에 미치는 영향 분석)

  • Gyeong-Tae Kim;Su-Ji Woo;Sung-Won Yoo;Young-Cheol Choi
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.11 no.2
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    • pp.153-160
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    • 2023
  • In this study, nano-sized C-S-H crystals were synthesized using the liquid phase reaction method and their properties were investigated. The synthesized C-S-H crystals were added to the cement composite in suspension form to determine their effect on the hydration properties of the cement. The amount of chemical admixture was varied to obtain nano-sized C-S-H crystals with optimal agglomerated morphology, and SEM photographs were analyzed. A cleaning process was added to remove harmful substances other than the synthesiz ed C-S-H crystals. It was found that the concentration of harmful substances was reduced in the case of C-S-H crystals subjected to the cleaning process. The synthesized C-S-H suspensions were prepared with and without the cleaning process, and cement composites were prepared with the cement weight content as the main variable. The effect of C-S-H crystals on the initial hydration properties of the cement was confirmed by microhydration heat analysis. In addition, mortar specimens were prepared to measure the compressive strength over time. The test results showed that the nano-sized C-S-H crystals act as nucleation sites in the cement paste to promote the early hydration of the cement and increase the early compressive strength.