• Journal of the Korean Recycled Construction Resources Institute
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• v.2 no.4
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• pp.314-320
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• 2014

Although the cement industry serves as the cornerstone of the construction industry by supplying one of its fundamental materials, it confronts new environmental challenges due to the problem of the $CO_2$ generated from raw materials and fuel used in the cement manufacturing process. Also, concrete structures can be decomposed and reused as construction materials. Simply in terms of the cyclic processing of $CO_2$, recycling waste concrete to manufacture recycled aggregate or recycling waste concrete powder, which is the material for cement can be considered optimally environment-friendly practices. This study contributes to the aim of manufacturing high value added materials that exploits the chemical properties of the waste concrete powder. From the research results, waste concrete powder is feasible to use to produce low carbon type recycled cement.

• Journal of the Korea Institute of Building Construction
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• v.13 no.3
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• pp.218-226
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• 2013

Of construction materials, cement and steel are the representative material that carbon dioxide. to reduce carbon emissions in the use of these materials The purpose of this study is low heat type blended cement, which is manufactured using a amount of cement than ordinary low heat blended cement. Low heat blended cement, mixing ratio of 10%, was investigated hydration properties and adiabatic temperature of concrete. The study in order to activate the reaction mineral admixture, a separate source of CaO and $SO_3$ areneeded. gypsum and lime, it expected amount of cement, low-carbon low-heat blended cement could reduce the hydration heat concrete than currentlyused low heat blended cement.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.1
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• pp.22-28
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• 2019

Cement is a basic material for the construction industry and it requires high temperature sintering when manufacturing cement. $CO_2$ emissions from raw materials and fuels are recognized as new environmental problems and efforts are underway to reduce them. Techniques for reducing $CO_2$ in concrete are also recommended to use blended cement such as blast furnace slag or fly ash. In addition, the construction waste generated in the dismantling of concrete structures is recognized as another environmental problem. Thus, various methods are being implemented to increase the recycling rate. The purpose of this study is to utilize the inorganic raw materials generated during the dismantling of the structure as a raw material for the low carbon type cement binder. Such as, waste concrete powder, waste cement block, waste clay brick and waste textile as raw materials for low carbon type cement binder. From the research results, low carbon type cement binder was manufactured from the raw material composition of waste concrete powder, waste cement block, waste clay brick and waste textile.

• Cement
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• s.193
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• pp.9-15
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• 2012

시멘트산업은 국가 기간산업이자 건설 기초소재 산업으로 성장과 발전을 거듭해왔다. 하지만 최근 들어 각종 규제와 수요 감소, 건설경기 불황의 여파로 다소나마 침체 기미를 보이고 있는 것도 사실이다. 이러한 가운데 저탄소 녹색성장시대의 등장과 함께 $CO_2$ 저감과 에너지 절감, 자원재활용, 환경친화형 생산 시스템 구축 등이 시멘트업계의 새로운 화두로 등장하고 있다. 그렇다면 시멘트산업의 최근 현안은 무엇이며 시멘트산업의 새로운 가능성을 타진하고 미래비전을 제시하기 위해서는 어떤 것을 준비해야 할까? 여기서는 '시멘트산업의 미래'를 주제로 이에 대한 오피니언리더 및 전문가 8인의 의견을 들어보았다.

• Cement
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• s.200
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• pp.26-35
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• 2013

한국시멘트협회는 지난 7월 1일 창립 50주년을 맞는데 이어 시멘트지가 2013년 겨울호를 기점으로 통권 200호를 발행하게 되었다. 시멘트지는 1963년 8월 25일 '양화공업'이라는 이름으로 창간호를 발행한 이후 반세기동안 시멘트협회 회원사뿐만 아니라 산 학 연 관 관계자 및 독자들로부터 꾸준한 사랑을 받아왔다. 이에 협회는 지난 4월 30일 협회 대회의실에서 시멘트협회 창립 50주년과 시멘트지 통권 200호 발행을 기념하여 국가 기간산업이자 건설 기초소재 산업으로 발전을 거듭해 온 우리나라 시멘트산업의 현재와 미래를 전망하는 좌담회를 개최했다. 각 분야 전문가를 초청한 가운데 진행된 이번 좌담회는 시멘트 생산 및 품질, 물류, 이에 따른 협회의 다양한 정책추진방향과 저탄소녹색성장시대의 등장에 따른 환경친화형 시스템까지 다양한 화두를 통해 시멘트산업의 미래를 조망해 볼 수 있는 유익한 시간이 되었다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.05a
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• pp.250-251
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• 2014

With the recent movement toward sustainable development, many efforts have been made to reduce environmental loads in various domains of industry. In particular, a great deal of research and technology development has been underway on approaches to reducing industrial waste and the emission of greenhouse gases. For this reason, a quantitative analysis of the reduction in CO₂ emission that could be achieved by replacing limestone material with cementitious waste powder was performed in this study. Through the analysis, it was found that CO₂ emissions were reduced by up to 50 percent compared with the scenario in which OPC was used, which suggests that it is possible to reduce global CO₂ emissions by approximately 5percent, or by 446.4 Tg of the 965 Tg of CO₂ emissions generated by the cement industry, in the total global CO₂ emissions of 19300Tg.

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.3
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• pp.252-260
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• 2022

In Korea, low-quality kaolin has significantly greater reserves and superior economic efficiency than high-purity kaolin. However, the utilization is low because it does not match the demand conditions of the market, and it is difficult to find a suitable source of demand. The purpose of this study is to derive the possibility and optimal calcination temperature of domestic low-quality kaolin that can be used as a raw material for limestone plastic clay cement (LC³). Isothermal calorimetry, X-ray diffraction analysis, Thermogravimetric Analysis, and compressive strength tests were conducted to evaluate hydrate generation and mechanical properties of LC³ paste according to calcination temperatures (600 ℃, 700 ℃, 800 ℃, 900 ℃). As a result, although 50 % of the clinker was replaced, the domestic low-quality kaolin clay produced calboaluminate hydrate and C(A)SH from the 3rd day of hydration, showing almost equal or higher strength to OPC, and there was a big difference in strength depending on the firing temperature.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.880-894
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• 2010

The Grout injected precast pile is widely used in rapid-transit railway bridge recently. The existing portland cement of well used filling at injected precast method that with low strength and environmental pollution, unstable in which ground water contamination by cement flow out, ground relaxation by water down, decrease of horizontality resistance and durability and load transfer divide etc. In particular, as in rapid-transit railway bridge need to secure safety from different angle with vibration of high speed train, horizontal force when train stop and earthquake. Works of foundation construction consider to requirements of the times to coal yard green growth. Together, new green foundation method for possible economics and securing of reduce the term of works are material to developments. Therefore, we carried out study that it is using and development new concept environment - friendly filling include durability and earthquake resistance, for secure safety and minimize environment pollution. To achieve this, we carried out difference tests that new green fillings of underwater concrete, high liquidity, high viscosity, early stiffness as compared to existing portland cement fillings. As results, new green filling have outstanding application at precast pile method and micropile construction method with vertical bearing capacity, horizontal bearing capacity and many case. From now on we will be looking forward to development of new environment-friendly foundation method from various further studies.