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이의학,정찬일,박수경,이경희,Lee, Eui-Hak,Jeong, Chan-Il,Park, Soo-Kyung,Lee, Kyung-Hee 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.10
Chlorine을 다량으로 함유하고 있는 산업 폐부산물의 시멘트 키른을 이용한 소각 가능성을 검토하고자 OPC에 KCl을 함량별로 첨가하여 수화발열, 응결시간, 유동성, 길이변화 및 몰탈 압축강도를 측정하였다. 실험결과 KCl를 첨가함에 따라 수화가 촉진되어 유도기가 짧아짐으로써 응결시간이 짧아지고 유동성이 하락하며 초기수축이 커지고 3일 이전의 초기 압축강도는 상승하나 7일 이후의 후기 압축강도는 크게 하락하였다. In order to examine the possibility of incineration of inderstrial by-product and wastes which contains a large percentage of chlorine by the cement kiln, measured heat of hydration, setting time, flow, change of length, compressive strength of OPC by the amount of KCl. The result was that a shorter setting time, a lower flow, a increasing the degree of initial shrinkage, a increasing of compressive strength before 3 days and decrease after 7 days by the induction period is shorter as promote the hydration with KCl.
보통포틀랜드 시멘트의 수화에 미치는 Boric Acid의 영향
이의학,송영진,송명신,이경희,Lee, Eui-Hak,Song, Young-Jin,Song, Myong-Shin,Lee, Kyung-Hee 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.4
무기질 지연제인 붕산 첨가시 OPC의 수화지연 특성을 연구하였다. 붕산 무첨가시에는 수화시작 수분안에 침상형의 Ettringite가 활발하게 생성하나 붕산을 첨가함에 따라 Ettringite와 $Ca(OH)_2$의 형성은 지연되었다. 이는 pH의 저하에 따른 Al이온의 안정화로 수화반응이 지연되기 때문이다. The influence of $H_3BO_3$ in one of inorganic retarder for the hydration of OPC was investigated. The shape of needdle Ettringite formed in few minitues for a no addition of $H_3BO_3$ but, retarded to form of Ettringite and $Ca(OH)_2$ according to addition of $H_3BO_3$. Hydration was retarded for tranquil of Al ion by to be low of pH.
석회석 미분말이 염소고함유시멘트의 수화반응에 미치는 영향
정찬일,이의학,이경희,Jeong, Chan-Il,Lee, Eui-Hak,Lee, Kyung-Hee 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.9
Length change, hydration heat, setting time and compressive strength of OPC were measured by adding KCl and replacing limestone powder so as to examine the influence of limestone powder on hydration of the OPC contained much chloride. In general, the chloride modified cement was high in heat of hydration, short in its setting time, low in its fluidity and low in its strength at 28 days due to the sudden hydration in its initial stage. As a result of the experiment, it has been demonstrated that heat of hydration, became low as one replaced limestone powder to the chloride modified cement, and the fluidity and shrinkage rate of mortar decreased without change in setting time; furthermore, the compressive strength at 28 days was improved.
염소 고함유시멘트의 페이스트 유동성과 모르타르 강도발현성에 미치는 화학 혼화제의 영향
정찬일,박수경,이의학,이경희,Jeong, Chan-Il,Park, Soo-Kyung,Lee, Eui-Hak,Lee, Kyung-Hee 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.1
To examine the effects of chemical admixture on the fluidity and strength development of high chloride cement, experiments were conducted in which lignosulfonate (LS), naphthalenesulfonate (NS), and polycorboxylate (PC) were each added in standard and excessive amounts, and the results were as follows. 1. Because adding KCl to NS causes a decrease in flow, adding PC is better in maintaining high cement fluidity. 2. When cement contained much chloride comes in contact with water, hydration begins 4 h after contact and securing workability becomes difficult, but by adding PC, workability can be secured to 10 h. 3. The bound water ratio and compressive strength in aging 3 days occupy $70\sim80%$ of those in aging 28 days, and the early compressive strength increases not only by adding KCl, but also by chemical admixture. 4. Although compressive strength development is excellent in NS, PC, if NS is added excessively, hydration becomes slow and while the pore structures become slightly minute, the strength development decreases due to severe setting retardation.
염소 고함유시멘트의 페이스트 유동성과 모르타르 강도발현성에 미치는 무기질 혼화재의 영향
정찬일,박수경,이의학,이경희,Jeong, Chan-Il,Park, Soo-Kyung,Lee, Eui-Hak,Lee, Kyung-Hee 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.1
Fluidity, setting time, hydration heat, bond water ratio, compressive strength, SEM and BET of OPC were measured by adding 1.0 wt% KCl and replacing 20 wt% mineral admixture in order to examine effects of blast furnace slag (BFS), limestone powder (LSP), and fly ash (FA) on fluidity and strength development of the cement contained much chloride. In general, the cement contained much chloride was high in heat of hydration, short in its setting time, low in its fluidity and low in its strength at 28 days due to the rapid hydration in its initial stage. As a result of the experiment, it has been demonstrated that fluidity became improved but the compressive strength at 28 days was decreased as replaced LSP to the cement contained much chloride. the fluidity and compressive strength at 28 days was improved as replaced BFS, the initial compressive strength development was improved due to the activation of initial reaction by KCl. Fluidity, initial compressive strength and late compressive strength at 28 days of cement contained much chloride replaced 5 wt% LSP and 15 wt% BFS concurrently was better than OPC, but the hydration heat was lower.