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MgO-KH<sub>2</sub>PO<sub>4</sub> 몰비 변화에 따른 마그네시아-인산염 모르타르의 배합실험
윤현섭 ( Yoon Hyun-sub ),이경호 ( Lee Kyung-ho ),양근혁 ( Yang Keun-hyeok ) 한국건축시공학회 2017 한국건축시공학회지 Vol.17 No.3
The objective of this study is to seek a reliable mixture proportion for magnesium potassium phosphate composite(MKPC) mortars with a near-neutral pH value (below 9.5) and a relatively good compressive strength exceeding 30MPa. The main parameter selected was the molar ratios(M<sub>mp</sub>) of MgO-to-KH<sub>2</sub>PO<sub>4</sub> which varied from 30.4 to 3.4. The setting time of the MKPC mortars tended to shorten with a decrease in M<sub>mp</sub> value. With regard to the strength development ratio normalized by the 28-day strength, the ranges measured in the mortars with an M<sub>mp</sub> below 7.9 were 50∼61% at 1 day and 60∼73% at 3 days, indicating a highly rapid early-strength development. With a decrease in M<sub>mp</sub>, the formation of struvite-K crystal identified as a primary hydration product increased, which led to the decrease of the macro-capillary pores in micro-structures. For achieving the targeted requirements for pH value and compressive strength, the M<sub>mp</sub> needs to be selected as below 5.1.
호안블록용 박테리아 기반 악취저감 키트의 악취제거 성능평가
양근혁,문주현,정기태,윤현섭,심재일,Keun-Hyoek Yang,Ju-Hyun Mun,Ki-Tae Jeong,Hyun-Sub Yoon,Jae-Il Sim 한국건설순환자원학회 2024 한국건설순환자원학회 논문집 Vol.12 No.2
이 연구에서는 박테리아 기반 악취저감 키트의 악취제거 성능을 평가하였다. 박테리아는 악취오염원인 암모니아(NH<sub>3</sub>), 황화수소(H<sub>2</sub>S), 총질소(T-P) 및 총인(T-N)을 제거할 수 있는 Rhodobacter capsulatus, Paracoccus limosus 및 Brevibacterium hankyongi를 사용하였다. 사용된 소재들은 박테리아와 다공성골재(팽창질석, 제올라이트 비드, 활성탄)이며, 제거 메커니즘에 따라 소재들의 융합을 달리하였다. 물리적 흡착 메커니즘을 갖는 소재들(제올라이트 비드 및 활성탄)은 악취오염원(NH<sub>3</sub>, H<sub>2</sub>S, T-P 및 T-N)의 농도 저감율이 점차 둔화되어 48시간 이후부터 더 이상의 악취오염원의 농도의 저감 효과가 없었다. 생물학적 흡착 메커니즘으로 악취를 제거하는 박테리아가 고정화된 팽창질석은 지속적인 농도 저감으로 108시간 이후에 악취오염원의 농도가 0 ppm에 도달하였다. 결과적으로 실제 하천수에서 물리적 흡착 메커니즘을 갖는 소재들의 악취제거 성능은 환경부에서 제시하고 있는 악취 배출허용 기준을 만족하지 못한 반면, 박테리아가 고정화된 팽창질석은 악취 배출허용 기준을 만족하였으며, 수질도 1등급으로 평가되었다. This study evaluated the odor removal performance of a bacteria-based odor reduction kit. The bacteria used were Rhodobacter capsulatus, Paracoccus limosus, and Brevibacterium hankyongi, which can remove ammonia (NH<sub>3</sub>), hydrogen sulfide (H<sub>2</sub>S), total nitrogen (T-P), and total phosphorus (T-N), which are odor pollutants. The materials used were bacteria and porous aggregates (expanded vermiculite, zeolite beads, activated carbon), and the combination of the materials varied depending on the removal mechanism. Materials with a physical adsorption mechanism (zeolite beads and activated carbon) gradually slowed down the concentration reduction rate of odor pollutants (NH<sub>3</sub>, H<sub>2</sub>S, T-P, and T-N), and had no further effect on reducing the concentration of odor pollutants after 60 hours. Expanded vermiculite, in which bacteria that remove odors through a bio-adsorption mechanism were immobilized, had a continuous decrease in concentration, and the concentration of odor pollutants reached 0 ppm after 108 hours. As a result, the odor removal performance of materials with physical adsorption mechanisms in actual river water did not meet the odor emission standard required by the Ministry of Environment, while the expanded vermiculite immobilized with bacteria satisfied the odor emission permissible standard and achieved water quality grade 1.
C/S 몰비 및 알루미늄 분말 첨가율 변화에 따른 고온·고압 기포 콘크리트의 발포특성
윤현섭 ( Yoon Hyun-sub ),박종범 ( Pakr Jong-beom ),이광일 ( Lee Kwang-il ),양근혁 ( Yang Keun-hyeok ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
Test results showed that foaming ratio of autoclaved aerated concrete significantly affected by the CaO/Si<sub>2</sub>O (C/S) molar ratio of the component materials, indicating the greatest foaming ratio of 202% when the C/S ratio was 0.9.