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황산 중화 레드머드 첨가량에 따른 시멘트 페이스트의 역학적 특성
인병은 ( In Byung-eun ),김상진 ( Kim Sang-jin ),강석표 ( Kang Suk-pyo ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In order to improve the strength degradation of the cement-based material to which strong alkaline liquid red mud was added, the liquid red mud was neutralized with sulfuric acid and added to the cement paste to examine the mechanical properties according to the amount added. As a result of measuring the compressive strength, the strength was higher when the red mud was neutralized with sulfuric acid and added to the cement paste than the cement paste to which the liquid red mud was added. As a result of hydration heat measurement, when red mud was neutralized with sulfuric acid and added to the cement paste, an initial strength higher than that of liquid red mud was expressed.
석회석 혼합시멘트의 분말도 및 SO<sub>3</sub> 함량이 시멘트 모르타르에 미치는 영향
인병은 ( In Byung-eun ),김진성 ( Kim Jin-sung ),남성영 ( Nam Seong-young ),김춘식 ( Kim Chun-sik ),조성현 ( Cho Sung-hyun ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Using the limestone powder as material that can alternate the clinker, it seems to get positive effect as filler and enhance workability of cement, but the amount of replacement can affect compressive strength of cement. This study was evaluated the effect of limestone mixed cement fineness and SO<sub>3</sub> content on cement mortar. As a result of measuring the compressive strength, it showed 93% compared to the compressive strength of Plain 28 days at fineness 4,400 and SO<sub>3</sub> 2.6%. It is judged that additional research is necessary to express the strength equivalent to that of Plain.
시멘트 분말도와 클링커 종류에 따른 석회석 15% 혼합시멘트 모르타르의 특성
인병은(Byungeun In),김진성(Jinsung Kim),김춘식(Chunsik Kim),강석표(Sukpyo Kang) 한국세라믹학회 2023 세라미스트 Vol.26 No.4
If the amount of limestone used as a mixing material is increased instead of the amount of clinker used, it may affect the cement mechanical performance, and there is a lack of research on applying limestone mixed cement to mortar. Therefore, in this study, the characteristics of limestone 15% mixed cement mortar were analyzed according to cement fineness and clinker types. As a result of measuring the flow and setting time of limestone mixed cement mortar, as the cement fineness and C3S content increased, the flow decreased and the setting time was shortened. As a result of measuring the heat of microhydration, the secondary peak value tended to increase as the cement fineness and C3S content increased. The compressive strength of the test specimen using cement powder level of 4500 ± 100 cm2/g and clinker with high C3S content on days 1, 3, 7, and 28 was 140%, 124.2%, 115.3%, and 101.6%, respectively, compared to plain. The compressive strength was high at 1, 3, and 7 days, and a similar tendency was observed at the 28-day compressive strength. Therefore, it is believed that increasing the fineness and C3S content of cement is effective in improving compressive strength.
발수제 혼입에 따른 시멘트 모르타르의 표면 얼음 제거성능에 관한 연구
강석표,홍성욱,인병은,김상진 한국건축시공학회 2022 한국건축시공학회지 Vol.22 No.6
본 논문은 발수제 혼입에 따른 시멘트 모르타르 표면의 얼음 제거성능에 다양한 요인 중 발수제 첨가 및 종류에 대한 영향을 검토하였다. 그 결과 발수제 첨가 시멘트 모르타르의 압축강도는 무첨가 시멘트 모르타르와 비교하여 감소하였고, 올리고머계 발수제 첨가 모르타르의 압축강도는 모노머계 발수제와 비교하여 높게 나타났다. 발수제 첨가 모르타르의 접촉각은무첨가 모르타르와 비교하여 증가하였고 모노머계 발수제보다는 올리고머 발수제가 상대적으로 증가하였다. 발수제 혼입에 따른 시멘트 모르타르의 얼음형성시간 측정 결과 발수제를 첨가하였을 때 25분까지 지연시키는 것으로 나타났다. 얼음제거하중 측정결과 발수제를 첨가하지 않은 모르타르는 342N을 발현하였고 발수제를 첨가한 모르타르는 31N을 발현하여발수제를 모르타르에 첨가하는 경우 얼음제거성능이 감소하였다.
황산으로 중화시킨 액상 레드머드를 혼입한 시멘트 페이스트의 수화특성
강석표,홍성욱,김상진,인병은 한국건축시공학회 2022 한국건축시공학회지 Vol.22 No.5
본 연구에서는 액상 레드머드를 첨가한 시멘트계 재료의 강도저하를 개선하기 위해서, pH가 10~12인 액상 레드머드(LRM)에 황산을 첨가하여 pH를 6~8로 조절한 중화레드머드(LRM+S)를 제조하였다. LRM과 LRM+S를 각각 시멘트 페이스트에 첨가하여 수화열, 압축강도, 수화생성물을 확인하였다. 수화열 측정결과 LRM을 첨가한 시멘트 페이스트는 Plain와비교하여 발열량이 낮고 수화속도가 지연되었지만, LRM+S를 첨가한 시멘트 페이스트는 Plain의 수화열 피크와 유사하게나타났다. 압축강도 측정결과 PS-LRM의 압축강도는 모든 재령에서 Plain의 압축강도보다 저하되었고 28일 재령에서 55%수준을 나타내었다. 반면에 PS-LRM+S의 압축강도는 Plain의 압축강도와 비교하여 28일 재령에서 유사한 수준을 나타내었다. XRD 분석 결과 PS-LRM는 3일부터 Ca(OH)2 피크가 확인되었지만, PS-LRM+S의 경우 Plain과 유사하게 1시간부터Ca(OH)2 피크가 나타났다. 따라서 강알칼리성의 액상 레드머드에 황산을 첨가하여 중화레드머드를 제조하여 시멘트계 재료에 첨가하면 강도저하를 개선할 수 있을 것으로 판단된다. In this study, Neutralized red mud(LRM+S) at a pH of 6–8 was prepared by adding sulfuric acid toliquefied red mud(LRM) at a pH of 10~12. After adding LRM and LRM+S to the cement paste, thehydration heat, compressive strength, and hydration products were examined. The observed accumulatedhydration heat revealed that the calorific value of the cement paste with LRM was low and its and peakwas delayed when compared with that of plain cement paste(referred to as Plain), whereas thecalorific value of the cement paste with LRM+S was similar to that of Plain. At the age of 28 days, thecompressive strength of the cement paste with 20% LRM was 55% of the strength of Plain. Using X-raydiffraction, it was determined that the cement paste with 20% LRM exhibited a Ca(OH)2 peak after 3days, whereas the cement paste with 20% LRM+S and Plain exhibited a Ca(OH)2 peak after an hour. Thus, the strength degradation of cementitious materials was improved by adding neutralized red mudprepared by adjusting the pH of highly alkaline LRM with sulfuric acid.
초소수성 발수제를 사용한 모르타르 표면의 결빙 방지 효과
김상진 ( Kim Sang-jin ),인병은 ( In Byung-eun ),강석표 ( Kang Suk-pyo ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In order to examine the adhesion characteristics of road pavement according to environmental conditions, the freezing time of cement mortar and the adhesion performance between ice and pavement were evaluated depending on the presence or absence of polymer and water repellent. As a result of measuring the ice formation time, it was found that there was no delay when a polymer was added, but the complete freezing time was delayed when a water repellent was added. As a result of measuring the strength of ice adhesion, it was found that the bonding force between ice and the surface of the test body was greatly generated in the test body without water repellent. In the case of a test specimen to which a water repellent was added, it was found that the bonding strength between the test specimen surface and ice was reduced.