• Title/Summary/Keyword: Admixture

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A Study on the Basic Properties of Polymer Cement Mortar Using SBR Latex with Blast-Furnace and Fly Ash (폴리머 디스퍼전 SBR과 고로슬래그 미분말 및 플라이애시를 사용한 폴리머 시멘트 모르타르의 기초적 성질에 관한 연구)

  • Kim, Wan-Ki;Jo, Young-Kug
    • Journal of the Korea Institute of Building Construction
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    • v.21 no.1
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    • pp.1-10
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    • 2021

  • The purpose of this study is to evaluate the improvement of flow, compressive and flexural strengths of polymer cement mortar(PCM) using SBR latex mixed with blast-furnace slag and fly ash. The test specimens were prepared with SBR polymer dispersion, two types of admixture (blast-furnace slag and fly ash), five polymer-cement ratios (P/C; 0, 5, 10, 15 and 20%), and six admixture contents (0, 3, 5, 10, 15 and 20%), plain cement mortar was also made for comparison. From the test results, the flow of PCM was significantly improved compared to ordinary cement mortar, but the flow was slightly reduced when mixed with blast-furnace slag, and the flow was similar to PCM when mixed with fly ash. In addition, the compressive strength of PCM mixed with admixtures was significantly improved, but the flexural strength did not improve except for some mortars. It can be stated that the optimum mix proportions of PCM using SBR with admixture contents 10 to 15% and P/C 10% for the compressive strength improvement, and P/C 20% for flexural strength improvement are recommended respectively in this study.

  • https://doi.org/10.5345/JKIBC.2021.21.1.001 인용 PDF KSCI

Applicability analysis of carbondioxide conversion capture materials produced by desulfurization gypsum for cement admixture (시멘트 혼합재로서 정유사 탈황석고를 활용하여 제조한 탄산화물의 적용성 분석)

  • Hye-Jin Yu;Young-Jun Lee;Sung-Kwan Seo;Yong-Sik Chu;Woo-Sung Yum
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.33 no.2
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    • pp.54-60
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    • 2023

  • In this study, microstructure and basic property analysis of DG (Desulfurization gypsum) and CCMs (Carbondioxide conversion capture materials) made by reacting CO2 with DG were conducted to analyze applicability as a cement admixture. The main crystalline phases of DG were CaO and CaSO4, and CCMs were CaSO4, CaCO3, Ca(OH)2 and CaSO4·H2O. As a result of particle size analysis, the difference in average particle sizes between the two materials was about 7 ㎛. No major heavy metals were detected in the CCMs, and as a result o f TGA, the CO2 decomposition of CCMs was more than twice as high as that of DG. Therefore, it was judged that CCMs could be used as a cement admixture through optimization of manufacturing conditions. As a results of measuring the strength behavior of DG and CCMs mixture ratios, the long-term strength of CCMs-mixed mortar was higher, and this is due to the filler effect of CaCO3 in CCMs.

  • https://doi.org/10.6111/JKCGCT.2023.33.2.054 인용 PDF

Carcinosarcoma of the Lung - Two Cases Report - (폐에 발생한 암육종: 2례 보고)

  • 황재준
    • Journal of Chest Surgery
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    • v.25 no.6
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    • pp.573-576
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    • 1992

  • The pulmonary carcinosarcoma is a rare malignant tumor, which composed of an admixture of histologically malignant epithelial and mesenchymal tissues. Carcinosarcomas comprise 0.2% of all pulmonary neoplasms and are most often found in a proximal bronchus. We report two cases of the pulmonary carcinosarcoma with a rewiew of the literatures.

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