• Journal of Conservation Science
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• v.27 no.4
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• pp.357-369
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• 2011

The Bongamsa Jeongjindaesa Wonotap Pagoda (Treasure No. 171) constructed in the 10th century composed mainly of leucocratic granite with feldspar phenocryst. The major rock-forming minerals are quartz, orthoclase, plagioclase and some biotite. This pogoda is highly damaged physical weathering which are break-out, flakes, exfoliation and cracks. As a result of the infrared thermography on the surface of the pagoda, internal exfoliations occurred to cracks. Also, P-XRF analysis showed that Fe, S, Ca and Mn of concentration were so high in the discoloration parts. The coated part of red pigment has a high five times in Fe content than the fresh rock surface. This result suggests that material of red pigment is hematite. Ultrasonic velocity of the stone properties were from 831 to 2,457 m/s, but it measured velocity of less than 1,000m/s in part of damaged area. Therefore, we suggest for safety conservation for weathered parts of the pagoda, that is in want of rejoin and consolidation treatment about serious damage parts.

• Journal of Korean Society of Forest Science
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• v.104 no.4
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• pp.588-597
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• 2015

This study was carried out to identify the reasons of the landslide by land creeping in South Korea in order to provide basic information for establishing the management plan for prevention. Total 29 sites of landslide areas caused by land creeping were observed in South Korea. Among them, the soil-composition of most frequent landslide areas occurred by land creeping was colluvium landslide as 75.9% (22 sites), followed by clay soil landslide as 10.3% (3 sites), bedrock landslide as 6.9% (2 sites), and weathered rock landslide as 6.9% (2 sites). According to the types of parental rocks, the investigated landslide areas were divided into 3 types: 1) metamorphic rocks including schist, phylite, migmatitic gneiss, quartz schist, pophyroblastic gneiss, leucocratic granite, mica schst, banded gneiss and granitic gneiss, 2) sedimentary rocks including limestone, sandstone or shale and mudstone, 3) igneous rocks such as granite, andesite, rhyolite and masanite. As a result, it was noticed that the landslides occurred mostly at the metamorphic rocks areas (13 sites; 44.8%), followed by sedimentary rock areas (12 sites; 41.4%), and igneous rock areas (4 sites; 13.8%). Looking at the direct causes of the landslide, the anthropological activities (71%) such as cut slopes for quarrying, construction of country house, plant, and road, farming of mountain top, and reservoir construction were the biggest causes of the landslides, followed by the land creeping landslides (22%) caused by geological or naturally occurred (22%), and cliff erosions (7%) by caving of rivers and valleys.

• Journal of Conservation Science
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• v.26 no.1
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• pp.85-94
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• 2010

Color stable hydrogenated bisphenol-A (HBA) epoxy adhesives containing organic-inorganic hybrid nanocomposites were prepared and investigated the properties. Isophorone-diamine (IPDA) was used as a hardener and polyhedral organomeric silsesquioxanes (POSS; EP0408 and EP0409) having epoxy function groups were used to tailor adhesives in the nanoscale range. The dependence of the concentration of different nano materials were studied since the large surface area of the nanosized particles can cause significant changes in properties of adhesives. HBA-IPDA adhesives containing different amount of nanomaterials have been applied to the fresh Namsan granite and compared with those of commercial adhesives, which have problems of color change as well as a high viscosity. The mechanical properties of HBA-IPDA containing POSSs are consistent with those of commercial adhesives in addition to the low viscosity.

• Korean Journal of Heritage: History & Science
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• v.53 no.3
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• pp.244-257
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• 2020

State-designated rain gauge pedestals, including a rain gauge support, were installed in front of the "Imunwon" at Changdeok Palace, made from various rock types. Some of those pedestals provide exact information on their production dates. These rain gauge pedestals are highly valuable as scientific instruments; however, there has been insufficient scientific research carried out on them. Therefore, precise analysis and conservative consideration are required. As a result of petrographic character analysis, the Changdeokgung rain gauge pedestal has been classified as marble. Furthermore, comparison of the results of P-XRF analysis with GSJ reference samples (JLs-1, JDo-1) has determined it to be dolomitic marble. Applying the same analysis to other state-designated rain gauge pedestals, it was presumed that the rain gauge supports at Gyeongsand-do Provincial Office and Gwansanggam were each made from aplite, pinkish medium-to-coarse biotite granite. Results confirmed that only the Changdeokgung rain gauge pedestal was made from marble. Marble is viewed as having an identity specificity rooted in a certain historical background. According to the tendency towards stone figures being made from marble, especially dolomitic marble, it is necessary to further studies whether particular rocks were used to make royal stone figures in Joseon Dynasty.

• 보존과학연구
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• s.33
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• pp.125-148
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• 2012

The Octagonal nine storied pagoda of Woljeongsa Temple consists mainly of granite with the rockforming minerals quartz, plagioclase, microcline, and biotite. The surface of the stone stupa is light brown that has been discolored by the rust from the metal ornament and aids. The surface of the stylobate and roof stone is colonized by biological contaminants. Therefore, a comprehensive deterioration diagnosis was carried out in this study, and conservation treatment was conducted. It was proven that the $Fe^{2+}$ yield increases depending on the count of poultice used with oxalic acid, but the $Mg^{2+}$, $Al^{3+}$, and $Ca^{2+}$ yields were marginal following the preliminary test. Therefore, the use of poultice is an effective way of removing the rust, and only marginally influences the rock. The biological contaminants were removed through dry cleaning, and the soil located under the contaminants was removed through wet cleaning. Based on this, the dry and wet cleaning of all the biological contaminants, and the use of poultice with oxalic acid, were done to remove the rust. For the conservation treatment of the metal ornament, the rust was removed through physical cleaning, and anticorrosion treatment was performed on the iron ornament using Renaissance wax and copper ornament by BTA.

• Journal of the Mineralogical Society of Korea
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• v.27 no.4
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• pp.251-262
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• 2014

Inorganic binders were studied in order to apply a conservation material for stone monument. A pure inorganic binder and 3 species of inorganic binder which contain additives on the basis of a pure inorganic binder were selected as test samples. Through the application of inorganic binders on Geochang granite investigate their influences on stone. pH 4.0 and 5.6 acid solution, respectively were manufactured on the basis of the acidity of domestic rainfall. Alkaline water with pH 8.0 and deionized water with pH 6.85 were prepared as control group. Changes in weights of inorganic binders were not definite according to the acidity of water while weight losses in inorganic binder type were greater after reaction with the water. The compressive strengths of pure inorganic binder was largest before the test but its decrease rate were larger after reaction with the water. Water absorption rate of inorganic binders are 6.72 to $12.44kg/m^2{\cdot}t^{1/2}$ after reaction with the water. Such high absorption was considered that it forced water to move deep into inorganic binder and made the components of inorganic binder dissolve. Acidities of the water of pH 4.0, 5.6, 6.85 and 8.0, respectively were changed to pH 9.0-10.0 after reaction with the inorganic binders. Ion concentrations in the water changed after reaction with the inorganic binders and $Mg^{2+}$, and $K^+$ significantly increased, dissolved from the binder. The high concentration of ions detected showed that the binder reacted with water and formed white salts with high solubility such as $MgSO_4{\cdot}nH_2O$, $KNO_3$. Ion concentrations significantly decreased from the binder after treatment with consolidant and water repellent.

• Journal of Conservation Science
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• v.26 no.3
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• pp.325-334
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• 2010

In order to clarify the effect of consolidant, the artificial porous material with low intensity was manufactured using granite powder and Portland cement. We have prepared four kinds of alkoxysilane system consolidants, a acrylic resin and a epoxy resin and investigated about characteristics before and after consolidation. As a result of the research, Silres BS OH 100 was effective for density and surface hardness. SS-101 with hydrophobicity and Site SX-RO with hydrophilicity had the good durability over salts weathering. On the other hand, Syton HT-50 and Paraloid B72 were easily destructed by salt weathering because they were concentrated on surface area by the low penetration depth. Araldite 2020 was the most effective consolidant for improvement of physical properties.

• Journal of Korean Tunnelling and Underground Space Association
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• v.4 no.4
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• pp.319-332
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• 2002

Domestic masonry railroad tunnel lining consists of red bricks or granite stone blocks and mortar. It is necessary to evaluate the behaviour of the masonry tunnel lining during an earthquake because the lining was constructed without the consideration of seismic loads. In this study, a methodology to evaluate the seismic resistant capacity of masonry tunnel linings was proposed, i.e. material property evaluation and seismic analysis technique. The red brick masonry tunnel lining is arrayed with multi-layers composed of 3 to 5 bricks depending on ground conditions and each brick is attached with mortar. Equivalent property concept was adopted to consider the stiffness difference among the red brick material itself and joints between bricks. Response spectrum analysis was performed by considering ground-structure interactions. A parametric study was performed to figure out the effect of relative stiffness between the lining and rock mass on the seismic behavior. A resonable countermeasure to minimize the earthquake-induced damage was also proposed.

• Journal of architectural history
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• v.14 no.4 s.44
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• pp.59-72
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• 2005

Architectural embodiment of a national identity has long been a significant topic in Korean architectural circles. For this reason, it must be helpful to examine the so-called, 'National Romanticism' of Finnish architecture around 1900 in that Finnish architects of the time struggled to embody their national identity through their projects. Considering the historical and linguistic affinities between Finland and Korea, the Finnish architectural situation draws . our additional attention. This paper aims at showing its historical background, the meaning of each type of buildings in the stream, and limitations it implies. The atmosphere of Finnish nationalist movement, which was provoked by [Kalevala] publications (1835; 1845) and shown in Karelianism, was heightened by Tsarist Empire's Russification programme of Finland in the late 19th century Architecture was one of the most important genres expressing her national identity. Finnish national romantic architecture could be divided into three. The first is a log house style for artists' studio house, motivated by the Finnish vernacular farmstead - especially by Karelian farmhouse. This type of building signifies the Finns' will to return to their motherly soil. The second is a stone architecture style for public buildings, inspired by Finnish church or castle of an early medieval time. By using roughly-cut granite as the main exterior material, buildings of this type symbolise the toughness of legendary heroes and Finns' desire for national Independence. The third type of building was based on both of the former or more dependent on architects' Imagination and creativity. However, Finnish national romantic architecture has been criticised by some critics owing to its decorative, eclectic and self-indulgent characteristics. Probably, it was not really national but rather inter-national because of the Influences of English Arts and Crafts Movement, the American Richardsonian architecture and the continental Art Nouveau. And the negative images of 'national' and 'romantic' made some historians coin other terms like 'national realism' or 'material realism'. As another limitation, one raises the low degree of its contribution to the entire architectural history. Despite these criticisms, however, this paper argues that Finnish national romantic architecture is meaningful in itself, particularly because it illustrates vividly Finns' struggle to search for their national identity and, after all, their craving for national independence.

• Spatial Information Research
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• v.14 no.3 s.38
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• pp.285-297
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• 2006

We aim to investigate the morphological and environmental characteristics of royal tombs of Chosun Dynasty by using GIS technique and remotely-sensed data. Most of the royal tombs are located on the banded gneiss and granite and over the south- and east. facing slopes and have altitudinal ranges of 150 to 200 meters. Due to the time gaps, exact locational preferences of the royal families can not be understood at this moment and also proximity to the running water is hard to be quantified. Close examination of Gwangneung indicates that the artificial modification and weathering have severe impacts on the slope and stone artefacts. The results from this research can be useful to preserve the valueless cultural heritages.