• Korean Institute of Interior Design Journal
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• v.15 no.2 s.55
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• pp.174-182
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• 2006

This study is focused on interior materials and wastes among other diverse environmental strategies for sustainable construction. The case study was carried out by using MSDG, mainly utilized in evaluating performance of sustainable constructions in Minnesota, the US, as an evaluation tool, in order to analyze American practices. In this study, a field inspection was conducted to 6 Minnesota cases, following a preliminary examination through literature study and portal site search, and then, constructive reports, interviews with people in charge, and empirical data including photos were added to the basic data provided by MSDG and MOEA As a result, it turned out *that sustainable materials were mainly used even in newly constructed buildings and wastes were properly managed in an environment-friendly, economical, and ethical manner, *that life cycle assessment showed reduction in some constructive costs even when the basic costs were high, *that some recycled finish materials were widely used in diverse areas, *that minimum consumption of raw materials, minimum environmental damage by materials, minimum effect of materials on IAQ were found in the examined cases, and *that many attempts were made to minimize resource consumption and constructive wastes from diverse perspectives.

• International Journal of Highway Engineering
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• v.7 no.1 s.23
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• pp.21-29
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• 2005

One way to recycle the construction wastes is to use the waste concrete aggregates as the pavement materials. Although there are many studies and technical developments about waste concrete aggregates, the impurities produced in the process of the aggregate production prevent the use of the waste concrete aggregates in the pavement construction. In this study, the impurities included in the recycled waste aggregates were classified into inorganic and organic ones according to their characteristics, and the influences of each impurities on the pavement performance were presented. It was also showed that the limit of impurity content in the lean concrete base through the correlation between the inorganic impurity content and the compressive strength, and that in the granuler subbase layer through the correlation between the organic impurity content and the modified CBR. In conclusion, it is possible to apply waste concrete aggregates for the pavement when inorganic impurity content is less than 10% in the lean concrete base, and organic impurity content is less than 2% in granular subbase.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.1
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• pp.182-188
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• 2008

The compounds of recycled polyethylene(PE) and fly-ashes were prepared. Polymers used were sorted PE from mixed plastics of household waste and Low Density Polyethylene(LDPE) and Linear Low Density Polyethylene(LLDPE) recycled from the scrap of packaging film plants. Fly-ashes were from the power plant and from the household waste incinerator. The tensile strength of recycled LDPE and LLDPE compounds decreased and the flexural modulus increased with greater amount of the power plant fly-ash. Anthracite fly-ash gave rise to slightly higher tensile and flexural strength of the LLDPE mixtures than bituminous coal fly-ash presumably due to higher content of unburned carbon. The incinerator fly-ash introduced to household waste PE enhanced both tensile strength and flexural modulus of the compounds. When LDPE and household waste PE were used together, the synergistic effect of incinerator fly-ash to household waste PE was offset by reduced crystallization of LDPE due to the filler particle. The compounds of household waste PE and incinerator fly-ash might be applied to structural materials for such as sewage pipe, which reduces the waste treatment cost and conserve the environment and resources.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.573-576
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• 2008

Recently, it is the well-known that there are some kinds of problem the waste concrete generated while repairing, reinforcing and dismantling of structures in the domestic and overseas. In this paper, various tests were performed about the use of the recycled concrete fine aggregate for the materials of high quality and structural concrete. And also, in order to improve structural performance of the concrete structure the steel frame was under overcrowded arrangement of steel bar. Consequently, it was be necessary the Self-Consolidating Concrete(SCC) that can fill the concrete into the work-form corner which has become overcrowded arrangement of steel bar without any other vibration. The purpose of this study is related to the properties of Self-Consolidating Concrete(SCC) according to mixing ratio of recycled concrete fine aggregate.

• Journal of the Korean Recycled Construction Resources Institute
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• v.4 no.1
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• pp.62-67
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• 2016

This study provides basic materials about setting pH standard of recycle aggregate by analysing pH change from elution time, type of solvent and ratio of solvent with existing experiment methods about recycle aggregate. Also it has purpose of evaluating impact of recycle aggregate outflow's pH on actual environment by building a model that is similar to condition of recycling recycle aggregates. pH of recycle aggregates seemed to not change a lot by time with each experimental method. To evaluate degree of generation by recycle aggregates in natural state, natural water with distilled water seemed be useful to use as solvent. Also it was possible to confirm that there is a difference between actual pollution in natural state by only pH of recycle aggregates.

• The Research Journal of the Costume Culture
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• v.15 no.3 s.68
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• pp.405-419
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• 2007

It is no more make consumers feel the freshness about a simple and functioned style reminding to the cyber-future style made by shining materials. Rather than that stereo-type of the future, people at present tend to feel more interested in something familiar than something new. Even though the amazing product made by human for better life, people become feel afraid that value be getting disappear, and it is natural that people should put more value to the nature, admire it, people try to find the new beauty in something worn being able to be felt the passed time. The vintage has turned up in the fashion area out of the mode of the antipathy from standardization, overconsumption, and also demand of a special thing different from mass product. The vintage is not the past-inclined trend but the new trend that people try to seek in the future to feel both comfort and newness. This study analyzed the vintage fashion style getting more important and also how the vintage fashion shows focusing in the domestic fashion market. The results as follow.: There are two meaning in vintage fashion, one of two is the recycled fashion style that current fashion made with used clothing, or reforming with new and old, Second, there is the new style using the past image, so called as the revival fashion. The totally current trend can be made in something new mixed with material or silhouette from past thing. The vintage fashion as recycled and reformed fashion will be more demanded from consumers who want to be comfort and still try to pursuit something new.

• Journal of the Korea Institute of Building Construction
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• v.15 no.2
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• pp.193-199
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• 2015

As a solution of both environmental issue of reducing carbon dioxide emission and sustainable issue of exhausting natural resources, in concrete industry, many research on recycling various by-products or industrial wastes as the concrete materials has been conducted. The aim of this research is feasibility analysis of additional reaction with ordinary Portland cement and flue gas desulfurization gypsum based on the blast furnace slag and recycled fine aggregate based mortar to achieve the normal strength range. Consequently, in the case of mortar replaced 10% FGD and 30% OPC for BS, 80% of plain OPC mortar's compressive strength was achieved. Furthermore, when the water-to-binder ratio is decreased to keep the practically similar level of flow, it is expected to be achieve the equivalent compressive strength to plain OPC mortar.

• International Journal of Highway Engineering
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• v.12 no.4
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• pp.147-155
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• 2010

A prediction model of resilient modulus($E_R$) was developed for recycled crushed-rock-soil mixtures. The evaluation of $E_R$, using the "orthodox" repeated loading tri-axial test, is not feasible for such a large-size gravelly material. An alternative method was proposed hereby using the subtle different modulus called nonlinear dynamic modulus. The prediction model was developed by utilizing in-situ measured shear modulus($G_{max}$) and its reduction curves of modeled materials using the large free-free resonant column test. A pilot evaluation of the model parameters was carried out for recycled crushed-rock-soil-mixture at a highway construction site near Gimcheon, Korea. The values of the model parameters($A_E,\;n_E,\;{\varepsilon}_r\;and\;{\alpha}$) were proposed as 9618, 0.47, 0.0135, and 0.8, respectively.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.33 no.5
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• pp.1-11
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• 2001

In the past, abundant and clean water was available for paper mills'use. However, the growth of population and industry made water less available nowadays. Also, environmental regulation limits wastewater discharge, which affects mill operation cost. Therefore, paper mills are under pressure to use more recycled water and mill system closure. As a result, chemical and physical parameters of water are changing and new environment if being created for microorganisms in paper mill system as well. The more soluble or suspended organic materials are increased as more water is recycled and less or scarce dissolved oxygen is available, depending on the degree of recycled water usage. Microorganism flora ill paper mill system will be a1so shifted according to the environmental change of mill system. Anaerobic bacteria, including sulfate reducing bacteria (SRB), will be dominant in the system as very low or almost no oxygen available in the system. Nevertheless, it is common in domestic paper mills that employ the same and old biocides as a means of microbial control, and microbiological control is often less recognized or even neglected. The right biocide selection for increased reductive environment of mills is critical for operation and estimated loss from paper quality defects such as sheet break, holes due to microbiological cause is tremendous compared to the microbiological control cost. It is imperative to investigate and diagnosis the environmental change of mills for right control of cumbersome microorganisms. Several useful diagnosis tools, including new technology employing OFM(Optical Fouling Monitor) in situ, are illustrated.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.1
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• pp.102-108
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• 2010

The main objective of this study was to evaluate the effect of recycled PET (RPET) fiber made from waste PET bottles to examine application on concrete member. To evaluate the reinforcement effect of RPET fiber in concrete member, experimental tests were performed, such as mechanical property tests (compressive strength, modulus of elasticity and splitting tensile strength) and drying shrinkage test. In mechanical property tests, compressive strength and modulus of elasticity in concrete mixed with RPET fiber gradually decreased, but splitting tensile strength gradually increased as volume fraction of fiber increased. In drying shrinkage test, free drying shrinkage increased. In restrained case, in contrast, crack occurrence was delayed because of tensile resistance increase by RPET fiber. The comparison of RPET and PP fiber added concrete specimen's properties showed that two materials had similar properties. In conclusion, RPET fiber is an alternative material of PP fiber, even finer for its excellence in eco-friendliness due to the recycling of waste PET bottles and its possible contribution to the pollution declination.