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고로슬래그와 폴리카르본산계 유기 혼화제를 첨가한 Belite-rich Cement 모르타르 유동특성
송종택,송종택,조현태,황인수,박춘근 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.2
In order to investigate the rheological properties of belite-rich cement(BRC) added polycarbonate-based superplasticizer and blastfurnace slags which have different blaines at 4500, 6000 and 8000$\textrm{cm}^2$/g, the change of minislumps and mortar slumps are measured with time. The rheological properties improve as specific surface area of added slag decreases or amount of polycarbonate-based superplasticizer increases. The slump loss can be controlled effectively by the steric hinderance effect of polycarbonate-based superplasticizer. According to the results, when mix proportion of the mortar is 1.5% mass content of superplasticizer and 30% mass addition of blastfurnace slag which blaine is 4500$\textrm{cm}^2$/g, the best mortar slump can be achieved without any significant segregation of materials.
송종택,안민선,정문영 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.12
In order to investigate the reaction in the system of fly ash-sulfuric acid-calcium hydroxide the hydrates were produced by the addition of Ca(OH)2 to fly ash activated with sulfuric acid at various temperatures. And then they were characterized by XRD. SEM and TG-DTA. It was found that in the reaction of fly ash with sulfuric acid fly ash was not decomposed but Al2O3 and SiO2 component in it were activated. The addition of calcium hydroxide into this system resulted in the formation of ettringite and calcium silicate hydrate (C-S-H) As the concentration of sulfuric acid and reaction temperature increased the amount of calcium hydroxide decreased fast. At this time gypsum produced by the reaction calcium hydroxide with sulfuric acid was consumed to form ettringite. Accordingly the formation of ettringite increased with calcium hydroxide and reaction time. And it showed faster than the formation of C-S-H.
$CaSO_4$ 자극에 의한 고로수쇄 슬래그의 수화반응
송종택 한국세라믹학회 1980 한국세라믹학회지 Vol.17 No.4
In order to clarify the mechanism of the hydration of supersulphated slag cement, the experiments of suspension hydration were performed in the mixtures of slag+CaSO4+water or NaOH solutions with a liquid/solid ratio of 10. The liquid and solid phase of the suspension was chemically analysed and discussed. In the slag-$CaSO_4$--NaOH system, $Al_2O_3$ was dissolved under high pH condition, and the ettringite was formed by a reaction of $CaSO_4$ and $Al_2O_3$ released in the solution. As hydration progressed, ettringite coated the surface of unhydrated slag grains and inhibited the hydration reaction of slag. $CaSO_4$ was not only an activator for slag hydration, but a reactant in the hydration.
고로슬래그 분말도가 시멘트 페이스트의 유동특성에 미치는 영향
송종택,유창달,변승호 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.2
In this study, the rheological properties of cement pastes containing blastfurnace slag of different fineness were investigated. The fluidity of cement pastes with low Blaine value blastfurnace slag was increased with decreasing the plastic viscosity and the yield stress of pastes. And the optimum dosage of polycarboxylate type superplasticizer to the cement pastes was confirmed according to the fineness and the replacement ratio of blastfurnace slag. All cement pastes showed the thixotropy behavior. And also it was formed that the segregation range of cement pastes was occurred below 10 D/cm2 of the yield stress and below 350 cPs of the plastic viscosity by the coaxial cylinder viscometer.
송종택,대문정기(大門正機),근등련일(近藤連一) 한국세라믹학회 1980 한국세라믹학회지 Vol.17 No.3
The experiments of suspension hydration were performed in the mixtures of slag and water or NaOH solutions which were made up with a liquid/solid ratio of 10. The liquid phase of the suspension was chemically analysed and discussed. When slag was in contact with water, CaO component was released from slag grains into the solution. The amounts of $SiO_2$ and $Al_2O_3$ liberated in the solution were very low as compared with CaO, for the impermeable coating of $SiO_2$, $Al_2O_3$-rich gel was formed on the surface of slag grains. The hydration was considered to be inhibited by this impermeable coating. The weak hydraulic property of slag was based on slowly released CaO and dissolved Na, K components which increased pH in the solution.
석고형태에 따른 Belite-rich Cement의 수화 및 유동특성
송종택,정재현,황인수 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.5
본 논문에서는 석고형태에 따른 belite-rich cement(BRC)의 수화성상 및 혼화제의 흡착거동으로부터 시멘트의 유동성에 미치는 영향성을 조사하였다. 또한, 보통 포틀랜드 시멘트(OPC)의 경우와도 그 영향성을 비교 검토하였다. 유동특성을 측정한 결과, 폴리카르복실산계 혼화제 사용시 반수와 이수석고를 첨가한 BRC가 미니슬럼프 값이 약 $\pm$20cm 근방의 수치를 보였으며, 무수석고를 첨가한 것과 OPC에서는 낮은 슬럼프치를 보였다. 초기 수화의 경우, XRD와 DSC에서 Ca(OH)$_2$의 생성량의 정도가 BRC 2-C(반수)>BRC 1-C(이수)>BRC 3-C(무수)의 순서로 줄어들기 때문에 장기강도측면에서도 반수석고와 이수석고를 동시에 사용하는 것이 우수할 것으로 추정된다. 또한 이 결과는 비표면적의 데이터와도 일치함을 보였다.