폐석분을 활용한 압출성형 시멘트 복합체의 양생조건에 따른 특성 변화에 관한 연구

송태협,이세현,김영훈,Song, Tae-Hyeob,Lee, Sea-Hyun,Kim, Young-Hun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8

Enormous side products and wastes have been produced from industrial activities. Besides fly ash, powder of furnace slag, and calcium deposits, tens of million tons of concrete products are discarded annually. These side products and wastes are recycled in various ways in line with their properties. However, some wastes such as crushed stone powder, glass, and wood wastes have exhibited very low recycle rates despite of their enormous amounts. These wastes are not economically feasible mainly due to high contents of impurities and moisture. This study carried out experiments substituting silica power in an cement extruding process for 50% crushed stone powder. Physical properties and hydrothermal characteristics of the crushed stone power were analyzed depending on the replacement and curing methods. Consequently, when 50% crushed stone powder was replaced, the overall rigidity of the product was less than that of the cement product with silica powder; however, the compressive strength turned out to be 90% of that in the silica powder product depending on secondary curing conditions. In this case, the pre-curing period was maintained in 2 hours while the primary and tertiary curing was carried out for 4 hours so that the overall compressive strength of the product with the crushed stone powder did not deteriorate the product quality. Therefore, changes in physical properties of the concrete product using the crushed stone power are not assumed to be significant when it is supplemented by $SiO_2$ sources to maintain the appropriate C/S mole ratio, and the hydrothermal reaction was also adequately activated.

폐석면의 활용을 위한 저온 용융처리에 대한 실험적 연구

송태협,김영훈,박지선,이세현,Song, Tae Hyeob,Kim, Young Hun,Park, Ji Sun,Lee, Sea Hyun 한국건설순환자원학회 2010 한국건설순환자원학회지 Vol.5 No.2

As a reinforced fabric, asbestos has been utilized as a fire-resistant material as it has a superior flexural stiffness and heat resistance up to $1500^{\circ}C$. However, due to its harmfulness, its use has been prohibited recently and the even the installed asbestos materials are being repaired or supplemented if there is a concern about flying. Asbestos is mainly used for construction panels as a reinforced fabric and coating materials to ensure the fire-resistance of steel frames. Asbestos was used as fire-resistant materials for steel frames until 1991 and then prohibited as Act on Industrial Safety and Health limits the concentration of asbestos in the air. Classified as a designated waste according to Act on Waste Control, asbestos must be buried if there is no possibility of flying (panel-type materials) or cement-solidified and then buried if there is a possibility of flying (spray coating material) In general, it is required that a new waste landfill include a certain landfill facility for designated waste, but in reality there is an absolute storage of landfill facilities for designated waste as they only install facilities of the size required by the regulations. This could result in the 2nd environmental pollution as they cannot process asbestos wastes which will be generated in large volume in the future. This study explores a method that melts asbestos wastes at $700^{\circ}C$ rather than cement-solidifying the waste asbestos from construction sites, especially asbestos-containing spray coating. The study results showed that there was no change in the composition and shape even though asbestos wastes was melted at $1300^{\circ}C$, but there was a change for the specimen which was process in advance for low temperature melting and then melt at $900^{\circ}C$.

친환경 압출 성형 콘크리트 패널의 내화성능에 관한 실험연구

송태협,박지선,이세현,Song, Tae-Hyeob,Park, Ji-Sun,Lee, Sea-Hyun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.12

The fire resistance performance of eco-friendly extruding concrete panel was analyzed experimentally. Two kinds of experiments were performed. First experiment, simple test, was considered four types of small size($500{\times}500$ mm) extruding concrete panel with 30 or 50 mm section thickness as well as heated by small furnace. And then from the pre-test results, second experiment was performed real size($3,000{\times}3,000$ mm) extruding concrete panel with two kinds of section types. One was composed single panel with 50 mm section thickness and the other was composed double 50 mm section thickness panel with air space. And all testing procedures including set-up test equipments and measuring devices were followed according to the KS F 2257-1, 8. From the second test results, it was found that the fire-resistance performance of all specimens in the second test were satisfied the fire-resistance standard of light weight wall.

순환골재 활용 건설자재의 활용 확대방안

송태협,이건철,이원표,Song, Tae-Hyeob,Lee, Gun-Cheol,Lee, Won-Pyo 한국건설순환자원학회 2016 한국건설순환자원학회지 Vol.11 No.3

프랑스 Jussisu 대학의 석면해체 및 석면관리 정책

송태협,Song, Tae-Hyeob 한국건설순환자원학회 2007 한국건설순환자원학회지 Vol.3 No.1

일본의 석면해체 관련 규정 및 폐석면 처리 정책

송태협,Song, Tae-Hyeob 한국건설순환자원학회 2009 한국건설순환자원학회지 Vol.4 No.1

측정방법 및 시간경과에 따른 순환골재의 pH 특성에 관한 연구

송태협,이종찬,이세현,Song, Tae-Hyeob,Lee, Jong-Chan,Lee, Sae-Hyun 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.3

시멘트의 강알칼리성 성분으로 인하여 파분쇄된 순환골재의 pH는 12이상을 발현한다. 이 시멘트의 강알카리성은 환경적으로 피해를 주게 된다. 순환골재의 강알카리성은 골재의 특성, 알카리 용출시간, 골재의 크기 등에 따라 다양하게 나타날 수 있다. 본 연구에서는 이러한 다양한 조건에 따른 순환골재의 pH 특성을 시험하기 위하여 습식 및 건식 생산공정에서 생산한 건식 및 습식 순환골재를 이용하여 폐기물공정 시험방법, 토양오염공정 시험방법, BS EN 1744-3에서 제시한 pH 시험방법에 따른 pH 특성, 순환골재의 용출시간에 따른 pH의 특성, 골재의 입도별 pH 특성을 분석하여 순환골재의 환경적 문제를 해결하는데 기여하고자 하였다. 시험결과에서는 순환골재는 입도가 작을수록 pH가 높은 것으로 나타났으며, 시간 경과에 따라 증가하는 것으로 나타났다. 건식과 습식 순환골재의 pH 경향은 시간 경과에 따른 차이 외에 시험방법에 의한 차이는 없었다. pH 시험방법에 있어서 폐기물공정시험에 의한 순환골재 pH값이 가장 높게 나타나 pH 편차를 고려한 단일 pH 시험방법 제안이 요구된다. The pH of recycled aggregate is over 12 because of high alkalinity of cement. This high alkalinity give circumstance harmful effect. The high alkalinity of recycled aggregate can appear variously according to aggregate properties, elution time of alkalinity, aggregate size, and so on. This study analyzed recycled aggregate properties according to wet and dry type manufacture process; different test methods: waste official test, soil contamination official test, BS EN 1744-3 standard; elution time and different size to test effects of various condition. These test results can contribute to solving environmental problems by recycled aggregate. In the test results, pH of recycled aggregate was as higher as smaller particle size and as time elapsed. There was no difference between dry and wet type recycled aggregate except for difference according to elapsed time. Waste official test method got the highest pH value between pH test methods. So unified pH test method need to test recycled aggregate pH.

영국의 건설폐기물 발생현황 및 재활용을 위한 Wrap의 기능

송태협,Song, Tae-Hyeob 한국건설순환자원학회 2006 한국건설순환자원학회지 Vol.2 No.1

팽창재를 사용한 시멘트 혼합물의 재령별 수화물의 특성과 초기강도 개선 효과

송태협,박지선,이세현,Song, Tae-Hyeob,Park, Ji-Sun,Lee, Sea-Hyun 한국재료학회 2013 한국재료학회지 Vol.23 No.10

CSA, a cement mineral compound that is mainly composed of $3CaO{\cdot}3Al_2O_3{\cdot}CaSO_4$, generates ettringite as a hydration product after a reaction with glass (lime), gypsum and water to speed up the hardening process and enhance the strength and degree of expansion. When used as a cement admixture, there is increased production of ettringite, which can improve the initial strength in the first three days and ameliorate the reduction in the initial strength caused by the use of fly ash in particular. In this study, a hydrate analysis was performed using XRD and SEM after substitution with fly ash (30%) and CSA (8%) with the goal of observing the effect of CSA on the initial strength of a cement mixture containing fly ash. The results of the analysis showed that an addition of CSA promoted the production of ettringite and improved the initial strength, resulting in the generation of hydrates, which can effectively enhance the long-term strength of these materials.

CSA 및 제지애쉬를 혼합재료 사용한 플라이애쉬 시멘트 모르타르의 수화 및 강도 특성에 관한 연구

송태협(Song, Tae-Hyeob),이세현(Lee, Sea-Hyun),서치호(So, Chee-Ho) 한국건설순환자원학회 2005 한국건설순환자원학회지 Vol.1 No.1

플라이애쉬를 콘크리트 혼화재로 사용할 경우 수화열의 저감, 내화학성의 증대, 건조수축의 저감, 장기강도의 개선 등의 여러 가지 장점이 있으나, 3일 이내의 초기강도 발현이 낮은 점과 성분중의 미연탄소분의 영향으로 인하여 AE제 흡착에 의한 공기량의 변동 등의 몇 가지 이유로 인하여 일부 공사를 제외하고는 일반적으로 10% 전후만을 사용하고 있다. 본 연구에서는 플라이애쉬 사용량을 시멘트량의 최대 30%까지 치환하고, 이때 발생할 수 있는 초기강도를 개선하기 위하여 무기질계 혼합재인 CSA 및 제지애쉬를 플라이애쉬 사용량의 8, 20%를 혼합하여 조기강도 특성 및 미소수화열 발생에 의한 조기강도 개선 가능성에 분석을 하였다. 미소수화열 측정결과 플라이애쉬를 10, 20, 30% 치환한 경우 강도에 영향을 줄 수 있는 제 1 Peak의 발열량 및 발현 시간이 OPC 배합보다 낮고 늦게 나타나고 있으며, CSA 및 제지애시를 혼입할 경우 발열량이 증가하고 시간도 단축되는 것으로 나타났다. 특히 제지애시를 혼합할 경우 강도에 영향을 줄 수 있는 제 2 Peak의 발현 시간 및 발열량이 OPC와 유사한 것으로 나타났다. 응결시간의 경우 CSA 및 제지애시를 혼입할 경우 플라이애쉬 배합보다 단축되는 것으로 나타났으며, 이는 미소수화열 발열량과 상관성이 있는 것으로 나타났다. 압축강도의 경우 플라이애쉬 배합에 CSA 및 제지애시를 혼입항 경우 조기강도 증진효과가 있는 것으로 나타났으며, 특히 제지애시를 혼입할 경우 강도 증진이 효과적으로 나타나는 것으로 분석되었다. 따라서 플라이애쉬를 다량 사용할 경우 이에 따르는 조기강도 하락 방지에 CSA 및 제지애시가 효과적으로 사용될 수 있을 것으로 검토되었다. The fly ash has been widely used in the latest to complement the performance and economical efficiency of the concrete which uses only a normal portland cement, the pulp ash gained through the incineration of paper sludge is possible to be used as the material of concrete because it contains the properties similar to the previous fly ash in ingredients and physical characteristics. Therefore, this research has tested physical characteristics by replacing 20% of fly ash used with the paper ash to solve the problem which lowers the early strength caused when the fly ash was used. As a result, it showed that the fluidity becomes lower and the compressive strength becomes increased by using paper ash. In addition, after mixing the paper ash with the fly ash, it showed that time and heating amount of the 2nd peak of the minor heat of hydration affecting the revelation of strength was equivalent to the combination for normal portland cement, and also indicated that the compressive strength for 3 days is superior to the combination of the fly ash. Therefore, if the paper ash having a regular fineness is used, it was effective in improving the early strength of concrete used the fly ash.