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소정섭,최상홀 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.8
This study was subjected to the stabilization of heavy metals using DSp cement. Heavy metal Cr and Pb ions were mixed with cement paste and hydration behavior and leaching property by heavy metal were exami-ned. It was found that, Cr ion accelerated the early hydration of the cement and has no accelerating effect in later hydration period. However Pb ion retarded the hydration of the cement for a early hydration periods. As a result of leaching test the quantity of leachant has a very low value and the influence of leached heavy metal effected on the environments is very weak.
무기질 충진재와 폴리우레탄을 활용한 유·무기 복합 단열소재의 특성 평가
이종규,소정섭,노현경,Lee, Jong-Kyu,Soh, Jung-Sub,Noh, Hyun-Kyung 한국재료학회 2012 한국재료학회지 Vol.22 No.11
Recently, inorganic-organic hybrid materials have attracted much attention not only for their excellent thermal conductivity but also for their flame retardant properties. In this study, the properties of organic-inorganic hybrid insulating materials using inorganic fillers and polyurethane foam with different foaming conditions have been investigated. The addition of 1.5 wt% water to polyurethane as foaming agent shows the best foaming properties. The pore size was decreased in the foaming body with increasing of the $CaCO_3$ addition. The apparent density and thermal conductivity were increased by increasing the $CaCO_3$ addition. With an increasing amount of $CaCO_3$ powder, the flame retardant property is improved, but the properties of thermal conductivity and apparent density tend to decrease. When the addition of fine particles of $CaCO_3$, the apparent density and thermal conductivity were increased and, also, with the addition of coarse particles over $45{\mu}m$ in size, the apparent density and thermal conductivity were increased as well. In this study, the adding of $CaCO_3$ with average particle size of $27{\mu}m$ led to the lowest thermal conductivity and apparent density. After evaluation with different inorganic fillers, $Mg(OH)_2$ showed the highest thermal conductivity; on the other hand, $CaCO_3$ showed the lowest thermal conductivity.
생석회의 팽창압 발현에 미치는 첨가제 및 양생온도의 영향
김원기,소정섭,김훈상,김홍주,이원준,신진호 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.9
Calcium oxide has been used as a demolition agent in fracturing rocks and old concrete structures, etc. With the agent, demolitionwork can be done in safety without a noise, vibration and any other pollution, since high expansive pressure is obtained gradually byonly mixing the agents with water and pouring the slurry into boreholes. But application of the non-explosive demolition agent is atime-consuming job, especially in winter. Essentially, this problem is related to the reaction rate of calcium oxide with water.This study examines the influence of additives such as cement and anhydrite on expansion pressure of calcium oxide at different curingtemperatures.The expansion pressure of calcium oxide began to increase steadily with the rise of the curing temperature. When mixing calciumoxide alone with water, blown-out shot occurred. But as additives were added to calcium oxide, the reaction of calcium oxide delayedreaction of calcium oxide.
MgCO<sub>3</sub>와 사문석을 사용한 마그네시아 시멘트의 무기 첨가제 영향
이종규,소정섭,Lee, Jong-Kyu,Soh, Jung-Sub 한국재료학회 2015 한국재료학회지 Vol.25 No.2
The carbon dioxide($CO_2$) released while producing building materials is substantial and has been targeted as a leading contributor to global climate change. One of the most typical method to reducing $CO_2$ for building materials is the addition of slag and fly ash, like pozzolan material, while another method is reducing $CO_2$ production by carbon negative cement development. The MgO-based cement was from the low-temperature calcination of magnesite required less energy and emitted less $CO_2$ than the manufacturing of Portland cements. It is also believed that adding reactive MgO to Portland-pozzolan cements could improve their performance and also increase their capacity to absorb atmospheric $CO_2$. In this study, the basic research for magnesia cement using $MgCO_3$ and magnesium silicate ore (serpentine) as main starting materials, as well as silica fume, fly ash and blast furnace slag for the mineral admixture, were carried out for industrial waste material recycling. In order to increase the hydration activity, $MgCl_2$ was also added. To improve hydration activity, $MgCO_3$ and serpentinite were fired at $700^{\circ}C$ and autoclave treatment was conducted. In the case of $MgCO_3$ as starting material, hydration activity was the highest at firing temperature of $700^{\circ}C$. This $MgCO_3$ was completely transferred to MgO after firing. This occurred after the hydration reaction with water MgO was transferred completely to $Mg(OH)_2$ as a hydration product. In the case of using only $MgCO_3$, the compressive strength was 3.5MPa at 28 days. The addition of silica fume enhanced compressive strength to 5.5 MPa. In the composition of $MgCO_3$-serpentine, the addition of pozzolanic materials such as silica fume increased the compression strength. In particular, the addition of $MgCl_2$ compressive strength was increased to 80 MPa.
신현주,소정섭,임형환,주범준,이혜원,임혜자 대한마취통증의학회 2016 Korean Journal of Anesthesiology Vol.69 No.6
Background: Continuous femoral nerve block (CFNB) improves postoperative analgesia after total knee arthroplasty (TKA). The aim of this study was to investigate the clinical efficacy and complications of our in-plane three-step needle insertion technique that was devised to reduce the risk of direct femoral nerve injury during CFNB in anesthetized patients. Methods: This retrospective study included 488 patients who had undergone TKA. Ultrasound (US)-guided CFNB was performed under general or spinal anesthesia using an in-plane, three-step needle insertion technique. The success rate and difficulties of catheter placement, clinical efficacy of analgesia, and complications were recorded. Results: Femoral catheters were placed with a 100% success rate. In 488 patients, real-time US imaging revealed easy separation of the fascia iliaca and the femoral nerve following injection of local anesthetic through a Tuohy needle. Verbal numerical rating scale pain scores (0–10) were 2.0 ± 1.2, 3.5 ± 1.9, 3.2 ± 1.7, 2.9 ± 1.3, and 2.5 ± 1.1 at 1, 6, 12, 24 and 48 h postoperatively. No femoral hematoma, femoral abscess, or neurologic complications, including paresthesia or neurologic deficits, were observed during the 8-week follow-up period. Conclusions: This retrospective study suggests that an in-plane three-step needle insertion technique for CFNB may reduce the risk of femoral nerve injury in anesthetized patients.