• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
• /
• pp.775-780
• /
• 2002

Sandwich panel made by foamed styrene and ployuretane has been used generally in the construction area because of the high thermal conductivity and light weight but they occur harmful gases to both bodies and environments in the high temperature over $50^{\circ}C$. So, the purpose of this study is to investigate the physical properties of light-weight panel using the non-structural lightweight aggregate as a part of the substitution of foamed styrene and ployuretane. This paper dealt with the effect of the addition of polymer dispersion such as SBR, St/BA-1 and St/BA-2 having polymer-cement ratio as 5, 10, 15% and the filling ratio of continuous void as 50, 60% on the strength of polymer-modified sandwich panel core. From the results, we could know that the compressive and flexural strength of the sandwich panel core using non-structural lightweight aggregate and polymer dispersion such as SBR, St/BA-1 and St/BA-2 tended to be increased with an increase in the polymer-cement ratio and the filling ratio of continuous void.

• 콘크리트학회논문집
• /
• 제13권3호
• /
• pp.285-293
• /
• 2001

본 연구는 기존 경량기포콘크리트의 문제점 및 역학적 성질의 개선을 위하여 산업폐기물인 폐스티로폼을 사용하여 경량기포콘크리트를 제조하고, 그 역학적 성질을 조사 분석하기 위한 것으로, 현장에서 주로 사용하는 배합을 기초로 하여 폐스티로폼의 혼입율을 최대 40%까지 단계별로 혼입하여 실험을 진행하였다. 또한 배합조건에 따른 경량기포콘크리트의 역학적 특성에 관한 상관관계를 분석하고자 하였다. 실험결과 폐스티로폼의 혼입율이 증가할수록 압축강도 증진에 효과적인 것으로 나타났으며, 현저한 흡수율 개선의 효과를 확인하였다. 그러나 플로우값의 경우 혼입율이 증가하면서 감소하여 해결해야 할 과제로 나타났다. 또한 단위시멘트량의 증가에 따라 압축강도도 증가하는 경향을 보였으며, 물시멘트비의 변화에 따른 압축강도의 변화는 미미한 것으로 나타났다. 또한 재령별 압축강도에 있어서는 초기의 압축강도 확보 및 장기강도의 증진을 위한 연구가 지속되어야 할 것으로 나타났다. 결과적으로 폐스티로폼을 사용하여 경량기포콘크리트를 제조할 경우, 산업폐기물의 재활용이라는 측면 뿐만 아니라, 경제적이고 안정된 품질의 경량기포콘크리트를 생산할 수 있음을 확인하였다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2020년도 봄 학술논문 발표대회
• /
• pp.77-78
• /
• 2020

In Korea, more than 30,000 tons of waste Styrofoam are produced every year. Styrofoam is spent more than 500 years decomposing during the reclamation process, so it needs to be recycled. The recycling rate of waste styrofoam continues to be the third highest in the world, but it is lower than that of Germany and Japan. Therefore, measures are needed to increase the recycling rate of waste Styropol. Another problem is that cement is mainly used in existing lightweight foam concrete. However, large amounts of CO2 from cement-producing processes cause environmental pollution. Currently, Korea is increasing its greenhouse gas reduction targets to cope with energy depletion and climate change, and accelerating efforts to identify and implement reduction measures for each sector. In 2013 alone, about 600 million tons of carbon dioxide was generated in the cement industry. Therefore, this study replaces CO2 generation cement with furnace slag fine powder, uses crude steel cement for initial strength development of bubble concrete, and manufactures hardening materials to study its properties using waste styrofoam. As a result of the experiment, the hardening agent replaced by micro powder of furnace slag was less intense and more prone to absorption than cement using ordinary cement. Further experiments on the segmentation and strength replenishment of furnace slag are believed to contribute to the manufacture of environmentally friendly lightweight foam concrete.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2012년도 추계 학술논문 발표대회
• /
• pp.177-180
• /
• 2012

Korea residential housing generally use wet floor heating system 'Ondol' which consist of insulation cushioning, lightweight foamed concrete, hot water pipe and mortar on top of reinforced concrete slab. Wet floor heating system's installation process is too complicate and difficult to supervise field for continuing assurance quality. Also, this method has a huge impact on the progress of construction because it take a long time to cure finishing mortar and lightweight foamed concrete. Therefore, it is considered a disturbance factor of reduction of construction duration for enhancing competitiveness. In this study, we conducted an experiment about the radiant heat performance and temperature difference on upper panel of rolled dry floor heating systems which is jointly developed by Kolon global and Sumisho Metalex for remodeling housing, studio apartment and the urban-life housing.

• 한국건축시공학회지
• /
• 제15권1호
• /
• pp.1-7
• /
• 2015

본 연구의 목적은 ALC 블록대체를 위한 고성능 기포콘크리트 배합설계를 개발하는 것이다. 대기양생 하에서 기포콘크리트의 고강도 발현(특히 초기재령에서)을 위하여 결합재 및 혼화제를 사전연구에서 다음과 같이 설계하였다. 규산3칼슘이 60% 이상인 보통포틀랜드시멘트에 무수석고 3%를 첨가하였으며, 폴리카르본산계 감수제에서 폴리알킬에테르 성분을 28%로 조절하였다. 이들 재료를 사용하여 물-결합재비와 단위결합재양을 변수로 기포콘크리트 11배합을 실험하였다. 배합된 기포콘크리트의 품질 및 실용성은 KS 규격의 ALC 블록의 요구조건 및 기존의 일반 기포콘크리트와 비교하였다. 실험결과 본 연구의 고성능 기포콘크리트는 ALC 블록의 요구조건을 만족하면서 높은 실용가능성을 보였다.

• KIEAE Journal
• /
• 제14권4호
• /
• pp.133-138
• /
• 2014

The present study was carried out to assess the basic material properties and thermal behavior of light-weight foamed concrete panel mixed with PCM (Phase Changing Material). To do so, this study fabricated light-weight foamed concrete (1.0kg/m3) in pre-foaming method and mixed it with PCM micro capsule of 1-dodecanol and melamine to examine its physical and thermal properties. The results confirmed strength reinforcement effect by proper replacement ratio of fly-ash, which is an industrial by-product, and PCM. In addition, it found out that PCM-mixed light-weight foamed concrete had time delay and temperature reduction effect within the range of PCM phase transition according to the rise of outdoor temperature. It was also observed that the insulation performance of PCM-mixed light-weight foamed concrete was more dependent upon thickness than PCM replacement ratio.

• 한국건설순환자원학회지
• /
• 제14권2호
• /
• pp.35-39
• /
• 2019

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
• /
• pp.717-720
• /
• 2008

This paper, an evaluation of the mechanical property for the backfilling materials of the NATM Composite lining tunnel using the lightweight foamed mortar, relates to the performance of permeability, compressive strength and unit volume weight. Therefore, this study is aimed to prove the three main factor that refered to the above line for development of new tunnel method. As the result of this study, it would be confirmed that the D mix is better than other mixs a side of all tests and its relation that is for the tunnel backfilling materials.

• 한국환경과학회지
• /
• 제29권6호
• /
• pp.605-612
• /
• 2020

To improve the initial strength and stability of lightweight-foamed concrete, which shows suitable sound absorption and insulation characteristics, the effect of CO₂-reduced cement on the properties of the concrete was investigated. Various mixing ratios were applied by substituting a certain amount of slag and Calcium Sulfo Aluminate (CSA) in CO₂-reduced Ordinary Portland Cement (OPC) and the physical properties of the samples were examined using the Korean Standard. The kiln temperatures of the CSA were 100-200℃ ; these values are lower than those of OPC and can lead to energy saving. In addition, the low limestone content reduces greenhouse gas emissions by 20 %. Adding a small amount of CSA in OPC content activates Ca-Al-H₂-based hydrates, and the initial compressive strength of the concrete is improved. As the CSA content increased, the thermal conductivity of the concrete decreased by up to 8% compared to plain concrete, thus indicating an improvement in its insulation. Therefore, the settlement stability was improved as the addition of CSA shortened the setting time.

• 한국건설순환자원학회지
• /
• 제4권2호
• /
• pp.28-36
• /
• 2009