• 한국지역사회생활과학회지
• /
• 제28권4호
• /
• pp.525-535
• /
• 2017

The purpose of this study was to compare the of ash and minerals contents in different types of soybeans (Baektae, Seoritae, Heuk Tae and Seomoktae) with different cooking methods. Raw, boiled and pan-fried soybean samples were prepared by the Rural Development Administration. Samples were digested by using a microwave and analyzed using ICP-OES and ICP-MS for determining the ash and minerals contents. Ash content in four raw soybeans ranged from 5.07 to 5.59 g/100g. There was no significant difference in the ash contents in raw and pan-fried soybeans (p>0.05). However, the ash content of boiled soybeans was 9 to 14% lower than that of raw soybeans (p<0.05). The minerals contents of Baektae and Seomoktae were high and the major minerals of various soybeans were K, P, Mg, and Ca, which accounted for ash 60.80-65.61%, 20.73-24.26%, 6.90-8.46% and 5.79-8.60%, respectively. The mineral contents of soybeans were significantly different depending on the type of cultivar (p<0.05), but the tendency was not constant. Because the process of soaking and boiling of soybeans made the soluble minerals elute, the ash and mineral contents were reduced. And process of pan-frying of soybeans make Because process of soaking and boiling of soybeans make soluble minerals elute (Ed- this section is very confused and seems to have 2 sentences combined: please check your intended meaning), the ash and mineral contents were reduced. As the soybeans are cooked by pan-frying, the water in the soybeans is evaporated and the mineral content is concentrated or kept constant. These results can serve as the basic data of mineral content during processing and cooking of soybeans.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1996년도 가을 학술발표회 논문집
• /
• pp.276-282
• /
• 1996

This study dealt with the properties for fly ash of combined heat power plant and application for concrete industry. For this purpose, fly ash of ulsan combined heat power plant was analyzed for physical and chemical properties and tested the properties of the super flowing concrete. As results of fly ash, contents of SiO2 and Al2O3 in the fly ash of Ulsan were less than those of thermal power plant(Boryung), but contents of CaO were ten times as much as those of Boryung. In order to satisfy the properties of the Super Flowing Concrete using class C fly ash, mixing conditions were determined the optimum water-binder(w/b), volume ratio of fine aggregates(Sr) and coarse aggregates(Gv).

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2017년도 추계 학술논문 발표대회
• /
• pp.103-104
• /
• 2017

This paper is to provide a method to prevent air loss of the concrete using reject ash based ternary blended aggregate due to absorption of AE agents by reject ash by adding AE agents into reject ash before mixing concrete. Test results indicate that air loss due to presence of reject ash in ternary blended aggregate can be recovered by over use of AE agents into aggregate directly before mixing.

• 한국해양공학회지
• /
• 제23권3호
• /
• pp.20-29
• /
• 2009

This study investigated the shear strength characteristics of waste tire powder-added lightweight soil (WTLS), which were developed to recycle dredged soil, bottom ash, and waste tires. The WTLS used in this experiment consisted of dredged soil, bottom ash, waste tire powder, and cement. Test specimens were prepared with various contents of waste tire powder ranging from 0% to 100% at 25% intervals and bottom ash contents of 0% or 100% by the weight of the dry dredged soil. In this study several series of direct shear tests were carried out, which indicated that the shear properties of WTLS were strongly influenced by the mixing conditions, such as the waste tire powder content and bottom ash content. The unit weight, as well as the shear strength of the WTLS, decreased with an increase in waste tire powder content. The shear strength of WTLS with bottom ash was 1.34 times greater than that of WTLS without bottom ash. An average increase in cohesion of 30 kPa was obtained in WTLS with the inclusion of bottom ash due to the bond strength induced from the pozzolanic reaction of the bottom ash. In this test, the maximum value of the internal friction angle was obtained with a 25% content of waste tire powder.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1995년도 가을 학술발표회 논문집
• /
• pp.84-88
• /
• 1995

The results of an experimental study on manufacture and mechanical properties of concrete utilizing crushed sand and fly ash for construction materials are presented in theis paper. As the results show, the workability, compressive strength and freezing-thaw resistance were improved by proper contents of fly ash, replaced crushed sand, and air entraining agent. And the drying shinkage was decreased by proper contents of those. Also, the suitable weight contents of replacing ratio of crushed sand and weight ratio fly ash in concrete using crushed sand were in range of 30% and 15% respectively.

• 한국세라믹학회지
• /
• 제20권2호
• /
• pp.135-146
• /
• 1983

This study is to investigate the properties of domestic fly ash for utilization as data in regard to fly ash which is by-product of domestic coal powder plants and the possibility of utilization as insulation material of domestic fly ash. Composition refractoriness size distribution density contents of hollow particles and crystalline phase were examined as the properties of domestic fly ash. As to the fired test pieces of fly ash by itself that varied contents of hollow particles with four kinds and of the fly ash-clay-saw dust system linear shrinkage bulk density app. porosity compressive strength thermal conductivity and structures were investigated for the possibility of utilization as an insulation material. The results are as follows : 1. The properties of the fly ash I) The constituent particle of the fly ash is spherical and it contains not a few hollow particles (floats by water 0.30-0.50 floats by $ZnCl_2$ aq.(SpG=1.71) 6.97-16.72%). ii) The chemical compositions of fly ash are $SiO_243.9-54.1%$ , $Al_2O_321.0-30.7%$ Ig loss is 7.4-24.1% and the principal of Ig loss is unburned carbon. iii) Fly ash was not suitable to use for mortar and concrete mixture because Ig. loss value is higher than 5% 2. Utilization as insulation material I) The test pieces of original fly ash floats by water floats by ZnCl2 aq(SpG=1.71) p, p t by ZnCl2 aq.(SpG=1.71) that were fired at 110$0^{\circ}C$ represented 0.11-0.18 kcal/mh$^{\circ}$ C as thermal conductivity value. ii) The test pieces which (76.5-85.5) wt% fly ash-(8.5, 9.5) wt% clay-(5.0-15.0) wt% saw dust system(68.0-72.0) wt% fly ash -(17.0-18.0)wt% clay-(10.0-15.0) wt% saw dust system and 59.5 wt% fly ash-25.5 wt% clay-15.0wt% saw dust system were fired at 110$0^{\circ}C$ the thermal conductivity was less than 0.1Kcal/mh$^{\circ}$ C. iii) In view of thermal conductivity and economic aspect insulation materials which added saw dust as blowing agent and clay as inorganic binder are better than that of fly ash as it is or separated hollow fly ash particles. iv) When the saw dust contents increased in the (59.5-90.0) wt% saw dust system and when amount of clay de-creased and firing temperature decreased under the condition of equal addition of saw dust app. porosity increased but bulk density compressive strength and thermal conductivity decreased.

• 대한환경공학회지
• /
• 제38권10호
• /
• pp.574-579
• /
• 2016

생활하수슬러지만 소각하는 시설에서 발생되는 비산재를 비료 제조시 주원료 또는 부원료로 활용하기 위해 비산재를 원료로 비료를 제조하고 구성성분을 분석하였다. 비산재를 포함해 제작된 비료의 구성 및 물성, 강도, 중금속에 대한 위해성 등을 분석하였다. 비산재는 충분한 인을 함유하여 비료의 원료로 사용될 수 있으나, 비산재를 주원료(40% 이상 포함)로 비료를 제작할 경우 조립화율(2-4 mm 입자 형성율)을 80% 이상 달성할 수 없었다. 비산재를 보조원료로 첨가하여 비료를 제조할 경우, 비산재 함유량을 15%이하로 유지하면 조립화율을 80% 이상 달성할 수 있었다. 비산재를 보조원료로 조립화된 비료의 중금속 분석결과, 폐기물공정시험기준인 용출실험에서는 위해성이 없는 것으로 나타났다. 그러나 토양오염공정시험의 함량분석 상으로는 비산재 함유량이 높아짐에 따라 카드뮴 등 중금속 위해성을 초과하는 항목이 발생되었다. 따라서 비료제작시 비산재를 보조원료로 투입할 경우 중금속을 제거하기 위한 전처리를 하지 않는다면 비료원료의 비산재 함유량을 7% 이하로 유지하는 것이 바람직하다.

• 자원리싸이클링
• /
• 제18권4호
• /
• pp.31-37
• /
• 2009

본 연구에서는 고로슬래그 미분말과 플라이애쉬 혼입률에 따른 3성분계 콘크리트의 역학적 특성과 내구성을 평가하였다. 이를 위해 플라이애쉬 혼입률 변화(0%, 10%)와 고로슬래그 혼입률 변화(0%, 10%, 20%, 30%)를 실험변수로 하였으며, OPC와 TBC의 특성분석을 위하여 압축강도, 휨강도 그리고 내약품성 시험을 실시하였다. 실험결과, 압축강도와 휨강도에서 플라이애쉬 및 고로슬래그 미분말 혼입이 장기재령에서 강도 증진효과를 나타내는 것으로 평가되었다. 특히 플라이애쉬 10%와 고로슬래그 30%의 3성분계 콘크리트 사용은 매우 타당한 것으로 나타났다. TBC의 특수저항성은 재령 90일에서 매우 낮은 등급으로 나타났다. 또한 OPC에 혼입되는 플라이애쉬 및 고로슬래그 미분말은 투수저항성 및 화학저항성의 향상을 가져오는 것으로 나타났다.

• 한국농공학회지
• /
• 제41권3호
• /
• pp.81-90
• /
• 1999

The purpose of this study is to examine the uses of fly ash asa type of construction material. This paper presents the results of research performed to identify optimum mix proportions for production of lowable fill with high volume fly ash content . The fly ash used in this study met the requirements of KS L 5405 and ASTM C 618 for Class F material. The flowable fill with high volume fly ash content was investigated for strength and flowability characteristics. Tests were carried out on flowable fill designed to have 10 ~15kgf/$\textrm{cm}^2$ compressive strength at 28 days with fly ash contents of approximately 260kgf/㎥. Slump was held at 25$\pm$1cm for all mixtures produced to range from 5kgf/$\textrm{cm}^2$ to 14kgf/$\textrm{cm}^2$ compressive strengths at 28 days. To produce flowable fill with high volume fly ash , first the influential variables were identified in an experimental study based on factorial design. Among the proportioning variables investigated, cement ,fly ash, and sand contents were found to have statistically significant effect on strength and slump of flowable fill . Subsequently, response surface analysis techniques were used to devise an experimental program that helped determine the optimum combinations of the selected influential variables based on material properties and cost. The optimized flowable fill were then technically evaluated. It is shown that flowable fill has acceptable compressive strength , slump flow, hardening time, and permeability.

• 한국연초학회지
• /
• 제9권1호
• /
• pp.19-26
• /
• 1987

KA 101 and Xanthi-Basma were cultivated in Korea and Greece to compare the respective responses to environments on their leaf composition during 1984 and 1985. Cured leaves cultivated in Greece had brighter and greenish color with 2-4 times higher total chlorophyll and carotenoids showing higher contents of total nitrogen, nicotine, petroleum ether extract, volatile acids and neutrals, but crude ash and pH of leaves at top stalk position were lower than in Korean cultured leaves. Xanthi-Basma showed higher contents of nicotine and total nitrogen, but lower contents of reducing sugar than KA 101. There were no difference in crude ash, petroleum ether extract contents and pH of leaves. Among stalk positions, the upper stalk leaves in Greece had higher contents of total nitrogen, protein nitrogen, nicotine, petroleum ether extract and volatile acids but lower contents of reducing sugar than lower ones., whereas the supper stalk leaves in Korea had much higher contents of total nitrogen, protein nitrogen, pH, crude ash, but not higher contents of petroleum ether extract and volatile acid contents than lower stalk position. It suggest that in chemical criteria the better quality leaves are on the upper stalk position in Greece but not the same in Korea probably due to the rainy weather conditions during the later growth stage in Korea.