페로니켈슬래그 미분말을 사용한 모르타르의 응결시간 및압축강도특성에 관한 실험적 연구

김영욱,김도빈,최세진 한국건축시공학회 2018 한국건축시공학회지 Vol.18 No.6

본 연구에서는 페로니켈슬래그 미분말의 시멘트 대체재로서의 가능성을 평가하기 위하여 페로니켈슬래그 미분말 사용 모르타르의 압축강도 및 건조수축특성을 비교·분석하였다. 연구결과 페로니켈슬래그 미분말을 사용한 배합의 경우동일한 양의 고로슬래그 미분말 및 플라이애시를 사용한 배합에 비해 미소수화열량이 낮게 나타났으며 모르타르 플로우는 상대적으로 다소 높은 것으로 나타났다. 또한 페로니켈슬래그 미분말을 사용한 모르타르의 압축강도의 경우 초기강도발현은 고로슬래그 미분말 및 플라이애시와 유사하게나타났으나 재령 28일에서는 상대적으로 낮은 압축강도를발현하였다. 건조수축의 경우 페로니켈슬래그 미분말을 사용한 배합에서 고로슬래그 미분말을 사용한 배합에 비해 낮은 건조수축값을 나타내었으며 플라이애시를 혼입한 배합의건조수축과 유사하게 나타났다. This study evaluate the fluidity and hardening properties of mortar by replacement ratio of ferronickel slag powderto estimate the applicability of ferronickel slag powder for cement replacement materials. Ferronickel slag powder wasreplaced by 0, 5, 10, 15 and 20% of the cement weight. In addition, blast furnace slag powder and fly ash were alsoused for comparing with the mixtures using ferronickel slag powder. As the test results, the micro-hydration heat ofthe mixture containing the ferronickel slag powder was lower than that of the mixtures containing the same amountof blast furnace slag powder and fly ash. The flow of the sample with ferronickel slag powder was relatively higherthan the other mixtures. In all ages, the compressive strength of the mixture with ferronickel slag powder and fly ashwas similar to that of the mix containing only fly ash. In case of drying shrinkage, the mixture containing ferronickelslag powder exhibited lower drying shrinkage than the mixture using blast furnace slag powder, and similar to themixture containing fly ash.

고로슬래그 미분말을 사용한 고성능 콘크리트의 역학특성 및 내구특성에 관한 실험적 연구

이상수(Lee Sang-Soo),송하영(Song Ha-Young) 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.11

In this study, the experiment was carried out to investigate and analyze the durability and mechanical properties of high performance concrete using blast-furnace slag powder. The main experimental variables were water/binder ratio 27.5, 31.5, 35.5(%) and replacement ratio of blast-furnace slag powder 0, 30, 50, 70(%). According to the test results, the principle conclusions are summarized as follows 1) When the replacement ratio of blast-furnace slag powder is increasing, slump flow become higher. but, high-range water reducer becomes less. generally, the more declining tendency the funneling time of type O shows, the more increasing replacement ratio of blast-furnace slag powder there is. 2) On one hand, at initial age, compressive strength is declined when replacement ratio of blast-furnace slag powder is increased; it shows same or higher values at age 28. on the other hand, when replacement ratio of blast-furnace slag powder is 70%, it shows lower level at age 28 comparing to plain concrete. also, elastic modulus generally shows similar level without the relation to replacement ratio of blast-furnace slag powder. 3) The durability of concrete using blast-furnace slag powder tends to be superior, but the carbonation of high performance concrete is no problem in this study scope in spite of depth of carbonation, as the replacement ratio increases.

에어 젯 밀(Air jet mill)로 분쇄된 고미분말 고로수쇄슬래그 혼합시멘트의 수화특성

조진상,유영환,최문관,조계홍,안지환,연규석 한국자원공학회 2010 한국자원공학회지 Vol.47 No.3

Blast furnace slag blended cement has some advantages of better concrete workability, lower permeability, and improved resistance to aggressive chemicals, higher compressive and flexural strength. However,blast furnace slag cement also has demerits of diminution of early strength, promotion of neutralization and increase of dry shrinkage. Two technologies for improving these demerits are able to be adopted. The first is a mixture of activators such as NaOH, Na2CO3, Ca(OH)2, CaSO4 and so on for promoting early hydration. The other is related to increase the fineness of blast furnace slag. In this study, by-product calcium hydroxide (Ca(OH)2) as an alkali activator was used, and effect of superfine blast furnace slag on the hydration properties was investigated. The results showed the early hydration was better, and the compressive strength at curing 91days was higher up to about 20% than the specimen mixed with slag 50wt.% of 8,000 cm2/g. 고로수쇄슬래그 혼합시멘트는 높은 콘크리트 작업성, 불투수성, 화학적 침투저항성과 높은 압축강도및 인장강도를 보이는 장점을 가지고 있다. 그러나, 고로수쇄슬래그 혼합시멘트는 초기강도의 저하, 중성화 촉진그리고 높은 건조수축 등의 단점을 가지고 있다. 이러한 단점을 개선하기 위하여 NaOH, Na2CO3, Ca(OH)2,CaSO4등과 같은 활성화제를 활용 할 수 있으며, 고로수쇄슬래그 자체의 분체특성을 개선시켜 보완할 수 있다. 본 연구에서는 고로수쇄슬래그의 초기수화 단점을 보완하기 위해 에어 젯 밀을 이용하여 슬래그의 분말도를약 16,000 cm2/g까지 증가시켰으며, 알칼리 활성화제로서 부산소석회를 사용하였다. 이렇게 분쇄된 고미분말고로수쇄슬래그 혼합시멘트의 수화 및 물리적 특성을 조사하였다. 실험결과, 혼합시멘트의 초기수화가 개선되었으며, 압축강도가 분말도 8,000cm2/g인 고로수쇄슬래그를 혼합한 경우보다 약 20%정도 향상되었다.

재유화형 분말수지와 고로 슬래그 미분말을 혼입한 폴리머 콘크리트의 압축강도 및 내산성

김인수,성찬용,Kim, In-Su,Sung, Chan-Yong 한국농공학회 2008 한국농공학회논문집 Vol.50 No.5

This study was performed to evaluate the compressive strength and acid-resistant of polymer concrete using redispersible polymer powder(RPP) and blast furnace slag powder(BSP). Material used were ordinary portlant cement, recycled coarse aggregate, natural fine aggregate, redispersible polymer powder and blast furnace slag powder. The main experimental variables were the substitution ratio of redispersible polymer powder and blast furnace slag powder, when the substitution ratios of RPP were 0, 1, 2, 3, 4, 5 and 6%, and those of BSP were 10%. The compressive strength and acid-resistant of polymer concrete using RPP and BSP were compared with those of ordinary concrete(Basis). When the substitution ratio of RPP was 1%, at age of 28 days, the compressive strength were more higher than those of Basis by 24%, and it was decreased with increasing the RPP content, respectively. Also, the water absorption ratio was decreased with increasing the RPP content. But, the acid-resistant was improved with increasing the RPP content.

생산지별 고로슬래그미분말이 굳지 않은 모르타르의 레올로지 성질에 미치는 영향

정재호,윤승조,이건철,이건영,김우재 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.6

최근 건축 구조물에서 고성능 콘크리트가 필수적으로 사용되고 있다. 고성능 콘크리트에는 수화열 감소, 장기강도 증진 등의 특징으로 고로슬래그미분말이 사용되고 있다. 본 연구에서는 고로슬래그미분말 생산지에 따른 품질이 굳지 않은 콘크리트의 유동성에 어떠한 영향을 미치는지 레올로지 관점에서 정량적으로 검토하였다. 고로슬래그미분말은 국내 대형 철강 생산 공장에서 발생하는 3가지의 고로슬래그를 이용하였다. 실험결과 고로슬래그미분말은 치환율이 높을수록 유동성능을 현저히 높여준다는 것을 알 수 있었지만, 생산지별 분말도의 차이는 크게 나지 않아 유동성능에는 차이가 미비한 것으로 나타났다. Recently, high-performance concrete has been used for building structure. Thanks to the reduced heat of hydration, and increased long-term strength, blast furnace slag is used for high-performance concrete. In this research, in aspect of rheology, influence of different sources of blast furnace slag on fluidity fresh state mortar was quantitatively assessed. The blast furnace slags used in this research were obtained from three different sources of domestic iron plants. For the results, as the replaced rate of blast furnace slag was increased, workability of fresh state mortar was increased while there is no significant difference between different blast furnace slags from various sources because of the similar particle sizes for blast furnace slags.

철강산업 부산물의 재활용에 관한 연구: 고로슬래그 재활용을 중심으로

박선규 목원대학교 교양교육혁신연구센터 2023 지식과 교양 Vol.- No.12

In this study, an experiment was conducted to reduce carbon dioxide emission which is the main cause of global warming in the construction industry. Blast furnace slag is used to replace cement that emits a large amount of carbon dioxide in the manufacturing process, and alkaline water was electrolyzed with potassium carbonate (K2CO3) as an electrolyte instead of an alkali activator to solve the problem of deterioration of initial strength and neutralization resistance of blast furnace slag. In other words, a series of experimental studies were conducted to reduce the amount of cement used by analyzing the compressive strength, micro structure analysis and neutralization test of concrete using blast furnace slag and electrolysis alkaline water. As a result, the compressive strength of mortar using alkaline water as the mixing water showed higher strength improvement than the mortar using general mixing water, and as a result of SEM analysis, more hydration products were generated inside the mortar test specimen using alkaline water as the mixing water. This is judged to be(by) the destruction of the glassy film through alkaline water and the elution of reactive substances from the blast furnace slag. In addition, as a result of the accelerated carbonation test, it was confirmed that the mortar using alkaline water as the mixing water had higher carbonation resistance than the mortar using general mixing water.

고강도영역 3성분계 시멘트 모르타르에서 FA와 BS의 혼합비율 변화에 따른 공학적 특성 분석

한천구(Han, Cheon-Goo),박성배(Park, Sung-Bae) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.9

The aim of the research is to deduce the optimal combination of fly ash and blast furnace slag for high strength range ternary cement mortar by evaluating the engineering properties of cement mortar depending on various combination of fly ash and blast furnace slag. According to the experiment, as the replacing ratios of supplementary materials were increased, the flow was increased, and for the air content, with increasing content of fly ash, generally, air content was decreased due to the unburnt carbon in fly ash. However, when the fly ash was included 65 %, the air content was increased by entrapped air. The unit mass of the mortar was decreased for increasing portion of fly ash because of relatively lower density of fly ash than blast furnace slag. The setting time was delayed with increased either entire supplementary materials and content of fly ash. Regarding the compressive strength, for each early and later ages, 25 and 65 % of supplementary materials replacements produced high compressive strength, respectively. The autogenous shrinkage was increased with increased content of blast furnace slag. In summary, regarding the compressive strength development, for early age, 25 % of supplementary materials consisted with 60 to 40 for fly ash to blast furnace slag while for later age, 65 % of supplementary materials consisted with 20 to 80 for fly ash to blast furnace slag.

Manufacturing Zero-Cement Bricks by Replacing Cement with Recycled Aggregates and Blast Furnace Slag Powder

Park, Kyung-Taek,Han, Cheon-Goo,Kim, Dae-Gun The Korean Institute of Building Construction 2013 한국건축시공학회지 Vol.13 No.1

In this study, a zero-cement brick is manufactured by replacing cement with recycled aggregates and blast furnace slag powder. Experimental tests were conducted with standard sized samples of $190{\times}57{\times}90mm$ (KS F 4004), and this manufacturing technique was simulated in practice. Results showed that the zero-cement brick with 0.35 W/B had the highest compressive strength, but the lowest absorption ratio. This absorption ratio of zero-cement brick with 0.35 W/B was lower than the required level determined by KS F 4004. Hence, to increase the absorption ratio, crushed fine aggregate (CA) and emulsified waste vegetable oil (EWO) were used in combination in the zero-cement brick. It was found that the zero-cement brick with CA of 20% and EWO of 1% had the optimum combination, in terms of having the optimum strength development (12 MPa) and the optimum absorption ratio (8.4%) that satisfies the level required by KS. In addition, it is demonstrated that for the manufacturing of zero-cement brick of 1000, this technique reduces the manufacturing cost by 5% compared with conventional cement brick.

Manufacturing Zero-Cement Bricks by Replacing Cement with Recycled Aggregates and Blast Furnace Slag Powder

박경택,한천구,김대건 한국건축시공학회 2013 한국건축시공학회지 Vol.13 No.1

In this study, a zero-cement brick is manufactured by replacing cement with recycled aggregates and blast furnace slag powder. Experimental tests were conducted with standard sized samples of 190 × 57 × 90 mm (KS F 4004), and this manufacturing technique was simulated in practice. Results showed that the zero-cement brick with 0.35 W/B had the highest compressive strength, but the lowest absorption ratio. This absorption ratio of zero-cement brick with 0.35W/B was lower than the required level determined by KS F 4004. Hence, to increase the absorption ratio, crushed fine aggregate (CA) and emulsified waste vegetable oil (EWO) were used in combination in the zero-cement brick. It was found that the zero-cement brick with CA of 20% and EWO of 1% had the optimum combination, in terms of having the optimum strength development (12 MPa) and the optimum absorption ratio (8.4%) that satisfies the level required by KS. In addition, it is demonstrated that for the manufacturing of zero-cement brick of 1000, this technique reduces the manufacturing cost by 5% compared with conventional cement brick.

천연수경성석회의 수화특성에 미치는 고로수재슬래그와 석회석 미분말의 영향

문기연,최문관,조계홍,조진상,안지환,홍창우 한국자원공학회 2015 한국자원공학회지 Vol.52 No.1

천연수경성석회와 석회석 미분말을 혼합하여 사용할 경우 수화초기 수화물의 생성을 촉진하며, 석회석미분말 입자 자체가가 경화체 내에서 binder 및 filler로서의 역할을 하기 때문에 응결 뿐 만아니라 전체적인경화체의 내구성을 향상시킬 수 있다. 따라서 본 연구에서는 NHL-BFS-LP 3성분계 페이스트 및 모르타르를제작하여 수화특성 및 이에 따른 물리적 특성 향상의 연관성에 대하여 조사하고자 하였다. 실험결과, 석회석미분말 혼합에 따라 수화초기인 재령 1일부터 ettringite와 calcium silicate 계 수화물이 생성된 것을 알 수 있었으며, 석회석 미분말 혼합량이 증가함에 따라 압축강도가 향상되며 응결시간이 단축되는 것을 확인하였다. 다만,석회석 미분말 혼합량이 30% 이상일 경우 압축강도가 감소하는 경향성을 나타내었다. Mixture of natural hydraulic lime (NHL) and limestone powder (LP) could promote formation ofhydration product because the limestone powder plays an important role as filler and binder in hardened mortar. Therefore, in the present study, the paste and mortar specimens of NHL-BFS (blast furnace slag)-LP were preparedto investigate hydration behavior and the effect of hydration on physical property. The results indicate that ettringiteand calcium silicate were observed within 1 day hydration by adding limestone powder, and that compressivestrength increased and setting time was shorten with increasing the amount of limestone powder. However, thestrength decreased with increasing further the amount to more than 30%.