In this study, they were evaluated that the fundamental properties of mortar using a superabsorbent polymer. From the results, the flow value tends to decrease as the SAP content increases, and the compressive strength shows no particular tendency. This is due to the difference in SAP absorption rate. Therefore, it is necessary to accurately measure the absorption rate depending on the type of SAP, and it is considered that addition of water should be depending on the absorption rate.

In this study, the compressive strength and elastic modulus of concrete mixed with electric furnace slag were evaluated. The concrete specimens were prepared using the steel slag as coarse aggregate and heavyweight waste glass as fine aggregate. From the results, compressive strength and the elastic modulus were improved with the addition of electric furnace slag.

In this paper, the flexural behavior of RC member recycled heavy weight waste glass as fine aggregate was evaluated by finite element analysis. From the results, the analytical results do not reflect the experimental results. This is because the stress-strain curve of the concrete specimen obtained from the compression test was used as the input data for the ABAQUS. Therefore, the ABAQUS, based on the experimental results of the stress-strain relationship of concrete, predicted the load-displacement relationship without considering the reduction in load capacity.

현재 많은 국가들이 천연자원이 고갈되는 문제에 직면해있고, 골재 공급이 어려운 상황이다. 이러한 상황을 고려하기 위하여 대체자원 개발을 위한 다양한 연구들이 수행되어왔다. 특히, 방사성 폐기물의 차폐를 위해 사용되는 고밀도 채움재는 많은 양의 골재를 필요로 한다. 또한, 채움재의 차폐 성능 개선을 위해서는 채움재의 밀도 증가가 요구된다. 따라서 밀도가 높은 산업폐자원의 중량콘크리트 골재로의 활용성을 확대하기 위한 기초 자료의 제공을 위해 본 연구가 수행되었다. 실험결과, OPC의 경우, 고밀도 폐유리에 의해 감소된 콘크리트의 강도는 제강슬래그를 사용해도 개선되지 않으나, 광물질 혼화재를 결합재로 사용하면 성능이 개선되었다. 따라서 고밀도 폐유리와 제강슬래그를 중량 콘크리트에 적용할 경우, 광물질 혼화재와 함께 사용하고, FA보다는 BFS를 사용하는 것이 바람직한 것으로 나타났다. 한편, 제강슬래그를 중량콘크리트의 골재로 대체할 경우, 제강슬래그의 높은 밀도로 인하여 탄성계수와 차폐성능의 개선이 가능할 것으로 판단된다.

최근 들어, 첨단산업의 발전으로 다양한 종류의 산업폐기물이 빠르게 발생하고 있다. 특히, 산업폐기물 중 중금속을 함유한 고밀도의 폐 브라운관 유리는 재처리 비용과 환경오염 문제로 인해 전량 매립‧처분되고 있다. 따라서 이러한 폐자원을 재활용하기 위한 기초 연구가 필요한 실정이다. 이에 본 연구에서는 중금속이 함유된 CRT 폐유리를 잔골재로 대체한 모르타르 시험체의 기초 물성과 방사선 차폐 성능을 분석하여 차폐 재료로의 활용성을 평가하였다. 연구 결과에 따르면 중금속을 함유한 CRT 폐유리를 잔골재로 대체한 시험체의 겉보기 밀도가 상승하였으며, 압축강도와 휨강도는 저하되는 현상을 나타냈다. 또한, 납 성분이 다량 함유된 폐유리 대체 시험체는 일반 모르타르 시험체보다 저에너지의 차폐 성능이 상승하는 효과를 보였으며, 122KeV·57Co 방사선원에 대해서는 일반 모르타르 시험체보다 2.5배 높은 선형감쇠계수를 나타냈다.

The heavyweight industrial waste was used as concrete ingredient instead of natural aggregate, however, design standard did not consider effects of heavyweight aggregate on flexural strength. Therefore, in this paper, correlation between compressive and flexural strength of concrete using industrial was compared. From the results, compressive strength and flexural strength decreased with industrial waste increasing. And, it was shown that the test results of flexural strength were higher than the predicted value from design standard.

In this study, the properties of mortar substituted heavyweight waste glass were evaluated. From the results, the flow value and density increased as the substitution ratio of heavyweight waste glass increased, and compressive and flexural strength decreased.

In this paper, the flexural behaviors with substitution ratio of heavyweight waste glass are compared and evaluated in reinforced concrete members. From the results, when the heavyweight waste glass was used as the fine aggregate, the yielding load (Py) and maximum load (Pu) were less affected. However, the load capacity of the RC member was gradually reduced on the large deformed stage when all of the fine aggregate was replaced by heavyweight waste glass.

In this study, the resistance of chloride penetration and sulfate attack of mortar substituted heavyweight waste glass were evaluated. As a result, chloride penetration depth and diffusion coefficient decreased with the substitution of waste glass, chloride penetration resistance is increased. For sulfate attack resistance, the effect of heavyweight waste glass was little.

In this study, the characteristics of density and flow value of mortar substituted heavy weight waste glass were compared with the aggregate ratio. From the results, the density and flow value increase as the substitution of waste glass increase, however, it is considered that the increase of the aggregate ratio of 30% or more does not contribute to the increase of the density.

Environmental pollution is the major problem associated with rapid industrialization, urbanization and rise in living standards of people. In order to reduce environmental pollution, therefore, shielding materials using industrial waste resources were developed and the radiation shielding performance was evaluated.

In order to solve the problem of natural aggregate exhaustion, several types of industrial waste have been studied for recycling of construction materials. In general, steel slag has been used as aggregate in concrete, however, steel slag has a problem of causing volume expansion by F-CaO. Therefore, in this study, the expansion properties are compared with aging period to solve the problem of the steel slag expansion. According to the test results, the expansion of the steel slag decreased regardless of the types of steel slag during aging period. And, the Electronic Arc Furnace Oxidizing Slag(EAF) had the better reduction in expanding than the Converter Slag(CS).

Recently, the industrial waste resources have been continually developed because of a lack of natural aggregate. In this study, before the applicability of concrete using steel slag as aggregate, the properties were evaluated. From the test results, it is showed that the water aging period of the steel slag had no effect on the air contents, slump, compressive strength and density.

In this study, we investigated the possibility of using the cementitious material as a base material for rock vegetation through the measurement of adhesion force, internal friction angle and vegetation observation of green soil. From the results, The adhesion force, internal friction angle measurements and the final growth state were improved than that of the existing green soil, so that it could be effectively applied to rock slope.

Filler material (concrete or mortar) has been used for shielding radioactive waste, however, it is proceeded out evaluation for radiation shielding performance. So, it is needed to check the property in the shielding performance. Therefore, in this paper, mechanical properties of concrete was evaluated for the applicability using heavyweight waste glass as fine aggregate of filler material. From the test results, compressive and elasticity modulus were significantly affected by substitution of heavyweight waste glass, however, it could be improved the performance by using mineral admixture as binder.

전자폐기물의 발생량이 급증하고 있고, 전자폐기물로 인한 환경오염 혹은 자원낭비등과 같은 문제를 야기하고 있다. 따라서 전자폐기물 안에 포함된 중금속을 재활용할 수 있는 기술 개발이 필요하다. 한편, 채움재(콘크리트 혹은 모르타르)는 방사성폐기물의 차폐를 위해 사용되나, 방사성 차폐 성능을 확보한 재료를 적용하고 있지 않다. 따라서 채움재는 차폐성능에 관한 신뢰가 부족한 상황이다. 그러므로 본 연구에서는, 전자폐기물을 채움재의 잔골재로 적용하기 위하여 콘크리트의 역학적 특성을 평가하였다. 실험결과, 압축강도, 휨강도, 탄성계수 및 1μm 영역의 공극이 상당히 영향을 받는 것으로 나타났으나, 광물질 혼화재를 결합재로 사용하면 성능이 개선되었다. 따라서 전자폐기물은 채움재의 잔골재로써 적용이 가능할 것으로 판단된다.

콘크리트는 장기수명이 요구되는 구조물에 적합한 건설재료로 내구성이 우수하지만 장기간 지하수에 노출되어 발생하는 칼슘용출 현상에 대한 이해 및 이에 따른 RC 부재의 휨 거동 특성을 평가할 필요가 있다. 실험결과에 따르면, 광물질 혼화재는 RC 부재의 장기강도 개선에 효과적이지만, 칼슘용출이 발생하면 RC 부재의 항복하중 및 휨 강성이 감소하고 중립축깊이와 처짐량이 증가하는 것으로 나타났다. 따라서 칼슘용출에 의한 열화는 RC 부재의 성능 저하를 유발하므로 칼슘용출 환경에 노출되는 지하구조물에 광물질 혼화재가 적용될 경우에는, 광물질 혼화재 종류에 따른 최적 혼입 비율이 마련되어야할 것으로 사료된다.

Electrical waste, such as heavy weight waste glass, has become a global concern in terms of resource recycling. At the same time, aggregate is one of the most widely used infrastructure materials, and it is being exhausted. So, in this paper, the heavy weight waste glass is considered as aggregate due to its physical characteristics and chemical composition. From the results, when the heavy weight waste glass substitution ratio increase, the compressive strength and flexural strength decreased.

In this paper, the slope adhesion force of the developed green slope soil was evaluated by simulating rainfall intensity. From the results, the slope failure didn't occur at all conditions. As the slope angle increases, however, the damage decreased. The developed green slope soil is considered to have sufficient adhesion capacity to the slope.

In this paper, the flexural test of concrete member damaged due to Calcium leaching were performed to evaluate the characteristics of structural behavior. From the results, yield load, maximum load and flexural rigidity of RC member damaged by calcium leaching were decreased and the depth of the neutral axis was increased.