• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.3
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• pp.56-64
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• 2019

Various approaches have been attempted to develop recycling technologies related to industrial waste resources containing metals. Among them, glass is not decomposed into microorganisms, so landfill is not suitable, and interest in the recycling of waste glass is increasing. In this paper, by incorporating chelate resin to suppress the elution of heavy metals in waste glass and using waste glass as a fine aggregate and we want to evaluate the strength, drying shrinkage, alkali-silica reaction and heavy metal leaching of shielded filler materials and to provide basic data for utilizing waste glass as an economical and environmentally friendly shielding filler. As a result of the test, it was found that the use of waste glass as a fine aggregate was effective in the development of strength, but the incorporation of chelate resin had an influence on the strength development. In addition, the addition of chelate resin was effective in improving drying shrinkage but it was found to affect the alkali - silica reaction. As a result of the heavy metal leaching test, the KSLP test method satisfies all the criteria for heavy metal leaching. However, in case of lead, the limit of US ANSI 67-2007a was exceeded and further study should be done.

• Journal of the Korean Institute of Landscape Architecture
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• v.46 no.6
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• pp.120-126
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• 2018

The study conducted an experiment in which residual aggregate and polypropylene fibers are mixed in concrete, and an experiment in which granite and polypropylene fibers are mixed. Two types of experiments, in particular, changed the amount of polypropylene fibers, and examined the mechanical properties of slump, compressive strength, tensile strength and the like. To establish a light and easy-to-use material for landscape construction and packaging material development by comparing two kinds of experimental results, comparing and analyzing residual aggregate as experimental materials and materials using granite soil to prevent partial destruction due to cracks in drying shrinkage. The more the amount of the PP fibers increases in concrete, the more the volume of the PP fibers increases, the less the slump is determined. As a result of the compressive strength, the cast-down earth concrete is measured to be about 59% to 71% of the concrete strength. As the amount of PP fibers mixed in increased, the compression strength showed a relative decrease. As a result of tensile strength, it is found that the granite concrete is about 68-67% of concrete tensile strength. It was found that the compression strength decreased as the amount of PP fibers mixed in concrete or fire-gant concrete was increased. Then, when polypropylene fibers are mixed in the concrete and the concrete, it is found that tensile strength is increased. By analyzing these results, a fixed amount of PP fiber is mixed in the concrete mixed with the granite soil and utilized for various structures in the field of landscape construction or materials related to packaging, the prevention and improvement effect of the structure is determined.

• Resources Recycling
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• v.19 no.6
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• pp.36-42
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• 2010

Researches on resources recycling in the field of construction have made an extensive progress such as recycled aggregate of waste concrete and recycling of asphalt. On the other hand, there are almost never researches on pavement method with used waste frying oil. In South Korea, 0.2 million ton used waste frying oil is discharged every year. It is guessed that about 0.1 million ton used waste frying oil can be collected. If used waste frying oil is recycled, it is expected that disuse cost will be reduced and water pollution of rivers will be prevented. Therefore, the purpose of the study was to evaluate on mechanical features (strength, water resistance, chemical resistance, abrasion resistance, freezing and thawing resistance and permeable coefficient) whether dense graded permeable concrete mixing silica sand with flexible alkyd resin manufactured by making ester reaction with collected used waste frying oil to make alkyd resin could be applied to road pavement for non-roadway. The results of the study were as follows. In flexural strength, it had 1.6 times as much as road design standard 4.5MPa. In water resistance, chemistry resistance and freezing and thawing resistance, they had lack of strength in early age. As age went by, they didn't have large changes. And curing temperature had phenomenon of increase in strength at rather low temperature than high temperature by glass transition temperature of resin. Therefore, considering workability, strength and durability when it was applied to road pavement, it was reasonable that the mixing ratio of flexible alkyd resin was 10~15% in comparison with silica sand weight.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.11
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• pp.1116-1122
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• 2008

The existing technology which is for recycling aggregate using dried swage sludge have been limited for practical application, because the properties of aggregate are not regular and don't meet the recycling aggregate standard. In this research, an innovative slag-producing technology is developed by addition of oyster shell, waste cast-sand and iron-rust as inorganic waste additives. The mixed slag with the additives was evaluated at the various ratio of CaO/SiO$_2$, SiO$_2$/Al$_2$O$_3$ and Fe$_2$O$_3$/SiO$_2$. When the waste sludge was melted at 1,400$^{\circ}C$ during 20 minutes, the optimal ratio of CaO/SiO$_2$ for the slag added the oyster shell, SiO$_2$/Al$_2$O$_3$ for added the waste cast-sand and Fe$_2$O$_3$/SiO$_2$ for added the iron-rust were 1.00, 3.00 and 0.60, respectively. At the optimal condition, the bulk density of the slag was 2.24 g/cm$^3$, 2.45 g/cm$^3$ and 2.73 g/cm$^3$, And the 24 h water adsorption was 4.72%, 1.44% and 0.37%, respectively. Therefore it is proved that adding the waste additives to the process of the slag production contributed for elevation of recycling aggregate properties. And also it is expected that production cost can be reduced by decreased melting temperature.

• Journal of the Korea Concrete Institute
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• v.24 no.4
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• pp.465-472
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• 2012

This research aims to find an effective mixing method for controlled low strength material (CLSM) using diverse recycled industrial byproducts. This study is a fundamental research to develop and commercialize a resource-recycling CLMS that can greatly contribute to cost reduction and environmental stress relief. In the past, few studies have been performed on CLSM in Korea. This research is expected to provide fundamental data not only for development and commercialization of the resource-recycling CLSM satisfying required material performances but also serve as a ground breaking study on utilization of recycled material in construction industry and ultimately leading to advanced resource-recycling practices at national level. From the comprehensive analysis of minimum unit quantity for maximum strength and material segregation prevention, it was found that the optimal mixing condition for mixing FSD, RSID and SD material to filler-aggregate ratio (f/a) was approximately 50.

• International Journal of Highway Engineering
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• v.13 no.1
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• pp.79-86
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• 2011

Recently, usage bicycle is encouraged to reduce fuel consumption and air pollution. For this purpose, bike road constructions are actively performed. However, types of pavement used in bike roads have high construction cost and performance comparing the required capacity of bike roads. Thus, an economical pavement type for construction is necessary for the effective development. Roller compacted concrete pavement have good requirements, such as easy construction and low costs, high structural performance of hydration and internal communication aggregation on compaction for bicycle roads. However, the pool landscape surface and resistance to deicer damage cannot be applied to the construction of bicycle roads. Thus, for solving this problem used coating which may have effect of improving the landscape and environmental resistance. To examine this effect were evaluated performance of roller compacted concrete pavement on the coating.

• Journal of Agricultural Extension & Community Development
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• v.4 no.1
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• pp.41-56
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• 1997

1970년대 이후 도시 중심의 급속한 공업화 정책을 추진한 결과, 농촌의 저발전 문제에 직면하고 있다. 1980년대 중반부터 이에 대한 대응전략으로서 농공단지 개발을 통한 산업유치, 농산물 가공산업 개발 및 유통체계 개선, 관광농업 개발 등이 논의되어 왔다. 오늘날에 와서는 WTO 체제 하에서 농산물 무역자유화가 보편적인 규범으로 자리잡아 가면서 이러한 변화를 더욱 재촉하고 있다. 이 글의 목적은 농공단지와 관광농원을 중심으로 우리 나라 농산업 발전과정을 고찰하고, 향후 발전 방향을 제시하는 데 있다. 농공단지와 관광농원 육성사업의 특성과 성패요인을 분석하는 데 있어서 이용된 자료는 주로 2차자료이다. 농공단지조성사업의 성과에 대한 많은 논란에도 불구하고, 개량적인 지표는 그것이 농촌지역경제 활성화에 직간접적으로 공헌하였음을 보여준다. 농촌노동력의 66.1%를 고용하고, 이들에게 1인당 월 평균 70만원 이상의 소득을 제공해 주었으며, 서비스업 등 관련산업의 성장에도 영향을 미쳤기 때문이다. 그러나 농공단지조성사업은 많은 문제점도 안고 있다. 농촌지역에 숙련 노동자가 부족하며 직업훈련 기회 및 창업지원 프로그램이 도시지역에 집중되어 있다. 또한 입주 기업이 농산물이나 골재 등 현지 자원을 활용하는 경우가 매우 적은 것으로 나타나고 있다. 이에 대한 대응책으로서 농촌 주민들이 손쉽게 참여할 수 있는 직업훈련 프로그램을 개발하여 제공해야 하며, 경영과 시장정보 분석 등을 기술적으로 지원할 수 있는 효과적인 지도체계를 구축해야 한다. 관광농업은 새롭게 떠오르는 산업이다. 아직 기반이 취약하지만 국가 경제성장과 도시화 진행 추이에 비추어 볼 때 관광농원은 점차 증가할 것으로 전망된다. 하지만 이 산업의 지속적인 발전을 위해서는 정책의 유연성을 확보해야 하고, 농원운영자의 경영능력이 향상되어야 하며, 수요의 계절성을 극복해야 하는 등의 과제를 안고 있다. 또한 공동운영 형태의 농원에 있어서는 참여자들을 효과적으로 조직하고, 토지소유권 분쟁을 해소해야 하는 문제가 있다. 무엇보다도 아직 이 산업의 기반이 취약하다는 전제 위에 점진적이고 지속적인 재정과 기술지원이 요청되고 있다. 다양한 운영 프로그램의 개발과 지역내 네트웍 형태의 연계개발 방식의 채택이 필요하며, 관광농원이나 농어촌휴양지 개발지역에서는 산업개발 및 주거지 개발계획이 관광여건 조성과 총체적으로 연계되어야 할 것이다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.233-239
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• 2006

As the number of aged-housing has been rapidly increased, many kinds of defects and problems such as degeneration of housing environment, structural performance, and equipment performance have been appeared. The reconstruction as the way to improve the aged-housing has been used mostly because the legal process of the reconstruction is relatively easy. On the other hand, it has caused problems such as the lack of natural aggregate, the environmental damages owing to construction wastes, the loss of national resources, and the lack of the housing for rent nearby the reconstruction area. This problems limit active tying into the reconstruction business at present in the industrial and political perspective. In this context, it is required to revitalize the remodeling rather than the reconstruction. In order to reach this objective, this research aims at identifying the user-oriented performance for the housing industry and developing the new technologies. It is expected that the result of this research can contribute to more revitalize the remodeling as tying researches in terms of design, structure, equipment, and construction.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.445-448
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• 2008

It is essential that concrete component is made up with aggregate, cement and water. But today, Public concern is increasing of a variety structure and ocean environmental, resource recycle. Also, According to heat of hydration rising, Concrete is make a causative of concrete-crack. Concrete-crack cause a falling-off in quality of concrete. consequently, High-performance concrete is evaluated by concrete material properties and carbonation resistance with different admixture(fixing fly-ash 20%), granulated blast furnace slag replacement ratio (30%, 45%) different W/B (26%, 30%, 34%) and XRD(X-ray Diffraction) analysis.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.711-716
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• 2023

A large amount of stone is required as a high-end strategy for building new construction and remodeling work, and aggregates have to be collected from many stone mountains due to the lack of river sand and gravel required for concrete production. This study examines the case of development of stone materials for construction, conduct and analyze residents' attitudes, find out residents' thoughts on stone mountain development, develops the area as an alternative to the devastation caused by stone mountain development, and recycles it as an efficient resource. We intend to conduct basic research to propose a plan. As a result, Local residents have a lot of antipathy against the use of quarry, so it is necessary to use the area that is far from the residents' areas as a quarry. It was concluded that it was desirable to restore and develop in the right direction.