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안응모 국제기독교언어문화연구원 2000 기독교언어문화논집 Vol.4 No.-
Dr. Eung Mo Ahn. 2000. Linguistic Paradox and Expressive Culture Collected Papres on christian Language Culture. On the basis of the proposition that, "since death and life are in the power of the tongue, it is imperative to know how it may be healed", this paper aims at linguistic order in which can be seen a desirable theory and wellwishing remark. In order to achieve this purpose, this paper makes an introductory remark in chapter 1. This paper argues human's pathological way of thinking in chapter 2. In chapter 3 the complexity of writing and speaking is argued. And, finally this paper reaches a conclusion in Chapter 4. In chapter 2 this paper argues in detail a problem proposal and words wishing one good luck. In chapter 3 cultural meaning, coexistence of universality and speciality, and expsessive complexity are argued in detail. In conclusion, this paper suggests that we should heal the corrupted earthly culture through the establishment of an orderly view of language.
화력발전소 바텀애쉬와 수산화나트륨 활성화제를 이용해 제작한 지오폴리머의 압축강도 특성
안응모,조성백,이수정,미야우치 히로유키,김규용,An, Eung-Mo,Cho, Sung-Baek,Lee, Su-Jeong,Miyauchi, Hiroyuki,Kim, Gyu-Yong 한국재료학회 2012 한국재료학회지 Vol.22 No.2
When a new bonding agent using coal ash is utilized as a substitute for cement, it has the advantages of offering a reduction in the generation of carbon dioxide and securing the initial mechanical strength such that the agent has attracted strong interest from recycling and eco-friendly construction industries. This study aims to establish the production conditions of new hardening materials using clean bottom ash and an alkali activation process to evaluate the characteristics of newly manufactured hardening materials. The alkali activator for the compression process uses a NaOH solution. This study concentrated on strength development according to the concentration of the NaOH solution, the curing temperature, and the curing time. The highest compressive strength of a compressed body appeared at 61.24MPa after curing at $60^{\circ}C$ for 28 days. This result indicates that a higher curing temperature is required to obtain a higher strength body. Also, the degree of geopolymerization was examined using a scanning electron microscope, revealing a micro-structure consisting of a glass-like matrix and crystalized grains. The microstructures generated from the activation reaction of sodium hydroxide were widely distributed in terms of the factors that exercise an effect on the compressive strength of the geopolymer hardening bodies. The Si/Al ratio of the geopolymer having the maximum strength was about 2.41.
Synthesizing and Assessing Fire-Resistant Geopolymer from Rejected Fly Ash
안응모,조영훈,전철민,이동구,이수정 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.4
Ordinary Portland cement is a widely favored construction material because of its good strength and durability and its reasonable price; however, spalling behaviour during fire exposure can be a serious risk that can lead to strength degradation or collapse of a building. Geopolymers, which can be synthesized by mixing aluminosilicate source materials such as metakaolin and fly ash, and alkali activators, are resistant to fire. Because the chemical composition of geopolymers controls the properties of the geopolyers, geopolymers with various Si:Al ratios were synthesized and evaluated as fire resistant construction materials. Rejected fly ash generated from a power plant was quantitatively analyzed and mixed with alkali activators to produce geopolymers having Si:Al ratios of 1.5, 2.0, and 3.5. Compressive strength of the geopolymers was measured at 28 days before and after heating at 900oC. Geopolymers having an Si:Al ratio of 1.5 presented the best fire resistance, with a 44% increase of strength from 29 MPa to 41 MPa after heating. This material also showed the least expansion-shrinkage characteristics. Geopolymer mortar developed no spalling and presented more than a 2 h fire resistance rating at 1,050oC during the fire testing, with a cold side temperature of 74oC. Geopolymers have high potential as a fire resistant construction material in terms of their increased strength after exposure to fire.