• 한국건축시공학회지
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• 제15권2호
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• pp.153-160
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• 2015

본 연구는 대리석가공과정에 발생하는 부산물인 폐 대리석 분말을 고유동 콘크리트의 유동성, 충전성 및 강도특성에 어떠한 영향을 주는지를 분석하였다. 실험결과, 폐 대리석 분말을 혼입한 굳지 않은 고유동 콘크리트 특성을 살펴보면 유동성이 증가하였고, 재료분리 저항성, 충전성이 우수하였다. 또한 경화한 고유동 콘크리트에서 압축강도는 폐 대리석 분말의 치환율 15%까지 모든 재령에서 압축강도가 증가하여 폐 대리석 분말의 최적 치환율은 15% 이내가 적정할 것으로 판단된다. 이상의 실험결과를 바탕으로 폐 대리석 분말을 고유동 콘크리트의 충전재로 활용하면 산업부산을 활용할 수 있어 환경오염방지와 콘크리트 제조시 원가절감의 이점을 동시에 달성할 수 있을 것으로 판단된다.

• 헤리티지:역사와 과학
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• 제53권3호
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• pp.244-257
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• 2020

국보 제331호 창덕궁 이문원 측우대는 제작 연대를 알 수 있어 문화유산으로서 가치가 높다. 그러나 국가지정 측우대에 대한 과학적 조사는 부족한 실정이며, 보다 정밀한 분석과 보존과학적 고찰이 요구된다. 따라서 문화재의 특성을 고려하여 정밀 육안 관찰을 통한 암석기재적 특징 조사, 휴대용 X-선 형광 분석, 전암대자율, 감마스펙트로미터 등의 비파괴 분석을 수행하였다. 창덕궁 이문원 측우대의 암석기재적 특징 분석 결과, 대리암으로 동정되었다. P-XRF 분석 결과를 GSJ Reference Samples(JLs-1, JDo-1)의 측정값과 비교한 결과, 백운암질 대리암으로 판단된다. 국가지정 측우대(국보 제330호 대구 경상감영 측우대, 보물 제843호 관상감 측우대, 보물 제1652호 통영 측우대)에 대하여 동일한 방법으로 분석한 결과, 대구 경상감영 측우대는 반화강암, 관상감 측우대는 중립-조립질 담홍색 흑운모화강암으로 동정되었다. 이와 같은 결과를 바탕으로 창덕궁 이문원 측우대의 구성 암석이 유일하게 대리암으로 제작되었음을 확인하였다. 또한 선행 연구 사례를 참고할 때, 경복궁 근정전 품계석 중 동반의 정1품 품계석, 서울 원각사지 십층석탑, 복각천상열차분야지도 각석의 구성 암석은 창덕궁 이문원 측우대와 동일한 재질인 백운암질 대리암으로 확인된다. 조선시대에는 신분에 따라 사용할 수 있는 재료가 구분되므로, 대리암은 시대적인 배경에서 신분적인 특수성을 가지는 재질로 해석된다. 또한 왕실에 의해 제작된 대리암 문화재들이 백운암질 대리암과 연관되는 경향을 고려할 때 특정 암종을 선택적으로 수급하였을 가능성에 대한 심화 연구가 필요하다.

• 보존과학연구
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• 통권16호
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• pp.123-128
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• 1995

For establishing the plan of scientific conservation on the Kyongch′onsa and site of Won-gaksa 10 floors pagodas, the investigation on the rocks consisting these pagodas has been made on the rock phase and weathering characteristics. The Kyongch′onsa pagoda consists of fine grained pale graylimestone containing abundant fossils of shell and fragments of organisms. The site of Won-gaksa pagoda is composed of marble of pale gray, white and/or light brown color, which is intercalated with thin mica schist. The marble, the recrystallized limestone, consists mainly of recrystallized calcite accompanied with minor amount of muscovite. Especially carbonate rocks are somewhat different in chemical weathering from such granitic rocks. The field survey and laboratory experiment using polarizing microscope had been done during 30 days from Feb, 13 to March, 31, 1995. The rocks equivalent to that of the site of Kyongch′onsa were identified from the Myobong limestone formation and taken samples around the road from P′yongch′ang to Mitan, P′yongch′ang-gun. The rocks similar to that of the site of Won-gaksa pagoda were distributed around Pan-un-ri, Chunch′on-myon, Yong-wol-gun. The rocks of the Silluksa pagoda consisting of white recrystallized limestone with banded structure are similar to the marble of the Hyangsan-riformation distributed around Suanbo, Ch′ungch′ongbuk-do.

• Advances in materials Research
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• 제11권1호
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• pp.75-90
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• 2022

In this paper, functionality of soft computing algorithms such as Group method of data handling (GMDH), Random forest (RF), Random tree (RT), Linear regression (LR), M5P, and artificial neural network (ANN) have been looked out to predict the compressive strength of concrete mixed with marble powder. Assessment of result suggests that, the overall performance of ANN based model gives preferable results over the different applied algorithms for the estimate of compressive strength of concrete. The results of coefficient of correlation were maximum in ANN model (0.9139) accompanied through RT with coefficient of correlation (CC) value 0.8241 and minimum root mean square error (RMSE) value of ANN (4.5611) followed by RT with RMSE (5.4246). Similarly, other evaluating parameters like, Willmott's index and Nash-sutcliffe coefficient value of ANN was 0.9458 and 0.7502 followed by RT model (0.8763 and 0.6628). The end result showed that, for both subsets i.e., training and testing subset, ANN has the potential to estimate the compressive strength of concrete. Also, the results of sensitivity suggest that the water-cement ratio has a massive impact in estimating the compressive strength of concrete with marble powder with ANN based model in evaluation with the different parameters for this data set.

• Advances in concrete construction
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• 제9권2호
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• pp.217-225
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• 2020

The recovery of waste proves a solution with two impacts: the environmental impact by the reduction of pollution and the gain of the occupied space by this waste, and the economic impact by the use of these lasts in the building and in the area of public works. The present research consists in recovering a waste marble (thrown powder exposed to the different meteorological phenomena) generated by the quarry marble of Fil-fila, located at the east side of Skikda in the north-east of Algeria, and add it, as sand in the composition of sand concrete. To carry out this research, we analyzed the evolution brought by the substitution of ordinary sand by marble waste sand, with 25%, 50%, 75% and 100% on the properties in the fresh state (density, workability and air content) and in the cured state (compressive strength, tensile strength, surface hardness and sound velocity). For durability we tested water absorption by immersion and chloride penetration. The results obtained are compared with control samples of 0% of substitution rate. In order to have a good filling of the voids in the granular skeleton; we added a quantity of limestone recycled fines from the quarries and for a good workability a super-plasticizing additive. The results showed that the partial substitution modified both the fresh and the hardened characteristics of the tested concretes, the durability parameters also improved.

• 한국광물학회지
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• 제30권4호
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• pp.187-194
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• 2017

본 연구에서는 주 구성 광물이 방해석인 대리암에 대하여 알콕시실란계 강화제인 0.8T0.2E1G_3wt0.08%와 1T1G_7wt0.08%의 적용성 평가를 수행하였다. X-선회절분석결과 방해석의 회절선의 위치는 변화가 없지만 강도는 약간 증가하는 경향을 나타낸다. 전자현미경 관찰 결과 강화제 0.8T0.2E1G_3wt0.08%로 처리한 경우 새끼줄 모양으로, 1T1G_7wt0.08%로 처리한 경우 판상 또는 엽상의 입자가 균질하게 피복되어 있는 표면을 관찰할 수 있다. 강화제 처리 후 표면은 두 가지 모두 약간 어두운 경향을 나타낸다. 쇼어경도와 초음파 속도는 두 강화제 모두 처리 후 증가하는 경향을 나타낸다.

• 상하수도학회지
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• 제11권1호
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• pp.53-63
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• 1997

The corrosion problems in water distribution system are reduced by decreasing the agressivity of drinking water which is evaluated by marble test and saturation indices(LSI or CCPP etc.). Marble test is a reliable method to determine the actual saturation condition of treated water. This study was done to determined the aggressivity of tap water and the effectiveness of $Ca(OH)_2$ and NaOH dosage for corrosion control. The drinking water in Seoul were evaluated by marble test and Langelier Index(LSI) and Calcium Carbonate Precipitation Potential(CCPP). The results indicated that the drinking water in Seoul were undersaturated as Calcium Carbonate($CaCO_3$). The LSI and CCPP of the water treated with $Ca(OH)_2$ were higher than that of water treated with NaOH. Therefore, to increase the Alkalinity and Calcium Hardness for corrosion control in water distribution system, $Ca(OH)_2$ is more effective than NaOH.

• 한국환경과학회지
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• 제11권5호
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• pp.445-454
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• 2002

Material exposure experiments were performed to evaluate the relationship between air pollution and material corrosion rates based on collaboration with researchers in China, Japan, and Korea. Qualitative and quantitative atmospheric corrosion was estimated from damage caused to bronze, copper, steel, marble, cedar, cypress, and lacquer plates exposed to outdoor and indoor conditions in certain East Asian cities. The effects of atmospheric and meteorological factors on the damage to the copper plates and marble pieces were estimated using a regression analysis. The results indicated that sulfur dioxide produced the most destruction of the materials, especially in South Korea and China. In Japan, the copper plates were damaged as a result of natural conditions and sea salt. Copper was also found to be damaged by the surface deposition of sulfur and chlorine. Meanwhile, marble was substantially degraded by gaseous sulfur dioxide, yet sulfate ions in rain had no effect. Accordingly, the analysis of air pollution from the perspective of material damage was determined to be very useful in evaluating and substantiating the intensity of air pollution in East Asia.

• 자원환경지질
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• 제23권4호
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• pp.411-424
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• 1990

Mechanical, physical and petrographic properties of seventeen marble specimens collected from ten marble mines in Korea were investigated. Studied marbles were mainly composed of calcite, dolomite, and various amounts of serpentine, tremolite, olivine, quartz and opaque minerals. Complete and sutured textures were dominant. Compressive strength measured normal to the bedding plane is larger almost two times than that measured parallel to the bedding plane. From the results of Shore hardness test on marbles, water content was an important factor to decrease Shore hardness values. Engineering geological properties, especially, compressive strength, Young's modulus, wear resistance and water absorption could be controlled by the presence of quartz, and the type of marble texture. Water absorption-porosity, compressive strength-Young's modulus, and impact strength index-Los Angeles abrasion couples show good correlation. According to the comparative utility as commercial stone, it could be concluded that marbles from the Banglim mine, Songbo mine, Kwangdeok mine and Bongjeong mine were superior to that of other studied marbles.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2017년도 제56차 하계학술대회논문집 25권2호
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• pp.85-88
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• 2017

In this paper, I analyze the success factors of the mobile game "Marble for Kakao", and propose the factors that should be emphasized when converting the board game to digital. has converted to digital game using board game widely known in Korea. At this time, it differs from the existing , reducing the time required to play the game once, allowing the user to concentrate for a short period of time by giving a visual expression, and to repeatedly play the game several times. It also allows users to experience a variety of maps and character enhancement systems so that they can continue to be interested. Thus, Marble for Kakao has optimized the digital environment, not digitally portraying existing board games.