[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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The purpose of this study is establishing the objective-based durability design method for building components. Herein the objective-based design means that selecting the most appropriate specification of building component according to the each requested performance level of durability. This study focused on the durability of RC building members which are border on the ambient air, such as roof slabs and exterior walls. The standard exposure test was discussed in this paper.

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It has been reported that vacuum processing is quite effective to obtain high density of concrete. The method, however, has not been successfully used for the concrete work in the field of building construction, compared with that of civil engineering works in Japan. In the present study, in order to clarify the best way to improve the usual vacuum processing method in the building construction work, a series of experiment is carried out. In this paper, the effect of the mesh size of filter mats for vacuum processing has been examined and discussion has been carried out on the strength distribution inside concrete slabs.

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Several studies have been made by the author on improvement of vacuum processing method for slab concrete so far. From the earlier studies, it has been shown that the most effective timing for vacuum processing is just after the end of bleeding. However, the finishing time of bleeding is influenced by many factors. In this study, the degree of bleeding has been evaluated from the consistency of fresh concrete, and a simple evaluation method for starting time of vacuum processing has been newly proposed.

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This report shows passing year survey of heat insulations and waterproofing at heat storage tank that constructed by PVC resin sheet. As a result, aging waterproofing sheet was shown that still remained the function of tensil strength and coefficient of extension yet. Furthermore, many part which heat insulations transformed was escaped damage of waterproofing by the favor of PVC sheet’s extension. From this, it is important that makes clear the function of PVC sheet’s extension and criteria for selection of thermal insulation to be used. A futre subject is positive accumulation of data and examined experimental validity on that materials.

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This research is the one that it was attempted to presume the surface temperature by insolation of the material which gives paints each color. The materials which spread paints each color in summer and winter were outdoor exposed and the surface temperature was measured. The materials used for the measurement wer aluminum, stainless steel, glass, and acrylic resin with different thermal character. Paints color used white, yellow, red, green, blue, black. The air temperature, material and the color examined the difference of the surface temperature when differing at result by the masurement of the surface temperature.

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Water-based emulsion paints and solvent-based paints including aliphatic organic solvent were evaluated by the outdoor exposure test at Florida state in USA for three years. Solvent type of paints which include aromatic organic compounds were also evaluated for comparison. Measurement of gloss retention and color difference was performed every third month. It was found that some water-based paints were as durable as the corresponding organic solvent type of paints including aromatic solvent. Therefore, it is possible to obtain water-based emulsion patints as durable as organic solvent type of paints.

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In this report, I reported the development of the water-born paint and low solubility hydrocarbon paint material that substitute the high durability and low contamination paint of a solvent system from experiment viewpoints. Also, I clarified the performance by evaluating the same kind material of a solvent system as a comparative article. And I recommended the coating system that made the most of the characteristic of each paint.

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Durability of FEVE(Fluoro-ethylene vinyl-ether) polymer for coating has been studied. Alternative polymer structure has been certified effective for good durability of polymer by the accelerated weathering test. Actual applications around 15 years show good weather-ability.

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[in Japanese]

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[in Japanese]

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The organic compounds contamination control in the cleanroom had been recognized as the important problem of the semiconductor and liquid crystal display manufacturing environment. We developed the low out-gassinng epoxy resin paint and acrylic emulsion paint used as the interior material of the cleanroom and examined their total hydrocarbon(THC) gas emission characterisitics. As a result of the investigation, THC gas emission rate from the improved paint was reduced than the normal paint, And we confirmed that the low out-gassing paint was effective for the organic contamination control in the cleanroom.

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In this paper, the stain resistance of external finishing materials containing titanium dioxide that has the effect of photocatalyst was investigated. Exposure tests to compare the stain resistance of photocatalyst coating materials were performed in Yokohama. The changes in difference of luminosity was observed for 1 years. It was found that photocatalyst coating materials showed the best stain resistance among coating materials, but there were problems of weather resistance and with recoating. Therefore attention is indispensable when adopting photocatalyst coating materials.

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Although the building materials with antimicrobial or stain-proof performance have been in use recently, the evaluation method of those has not been established yet. Therefore, the authors have been trying to evaluate them by use of electrical surface resistance. This paper describes the results of the outdoor test of about one year and the accelerated weathering test of 3000 hours aiming to examine the performance of exterior tile with optical catalyst stain-proof. As the results of those, it was clarified that the surface resistance of tiles corresponded to stain. Consequently, the degree of stain attached to tiles can be evaluated by use of surface resistance.

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[in Japanese]

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In actual building jointing photocatalyst by organic elastic adhesive, photocatalyst against contamination tile was tested for used state and contamination in passing of time. And, durability of photocatalyst ability was tested. Further, organic elastic adhesive was tested for mortal jointing method, comparison of working efficiency, and jointing durability. In researching after two years from worked, following was found.
1. In working ability, adhesive jointing method was superior to mortal jointing method.
2. In passing of time, changing of adhesive strength was small, and inferiority tendency couldn’t be confirmed.
3. Contact angle with water of photocatalyst tile was less than 15 degrees that is initial standard. And inferiority tendency couldn’t be confirmed.
4. Actual used condition, photocatalyst tile had sufficient ability against contamination.

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Recently, the number of external walls constructed from tiled extruded boards are increasing in connection with the terms of the work and the costs of construction. Accordingly, deformation of extruded boards and water leakage have come into question. The present situation, however, is that the properties of tiled extruded boards are mostly unknown and there is little basic data about them. In this report, we have examined the best bonding materials for extruded boards with smooth surfaces to be tiled with elastic bonding materiales, and we have tested the durability performance by conducting fatigue tests.

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A topological finishing composite pattern is corresponded 1 by 1 to rooted meta-graph composition as a dual structure. Graph composition which is basic structure of meta-graph composition can be shown as composite pattern of basic line graph, basic plane graph, and basic cubic graph, with dot joint, line joint, plane joint. This study reports an algorithm for counting-up all the pattern of cubic graph, which is important and most complicated graph composition, adopting plane joint system of basic cubic graphs, and shows all the counting-up cubic graph figures from 4 dots to 7dots.

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As for the office building of our country, emphasis is put on work space. The space into which lighting does not go is used for a warehouse, a copy room, etc. The man who is generally in non-window space receives a monotonous feeling and a feeling of closing, and he becomes negative mentally. In the conference room which performs a vote and discussion of deliberations, the existence of a window affects a mental and moral target. A windowless meeting room defines by this report, an investigation example is introduced, and a measure is described. A measure describes mitigation of the feeling of closing of a windowless conference foom, or a monotonous feeling.

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We can see visual plates for bumps at stairs of subways and JR-lines. But those plates are much various, which is disadvantage to them who need the plates. And it is no small plates which are damaged from wear. This study’s purpose is building plates are good visual and unified gauge. This report is the result of classification by forms and color schemes. First, we investigated into the actual conditions at Eidan-subway of “Ginza-line”, “Nanboku-line” and “Yurakutyo-line”. Next, we compared living plates by both angle, weak eye sight and able-sight.

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Mr. Ashihara, architect, designed Musashino Art university. A building is the design which concrete skin was used for. It passed through 34 years, and deterioration proceeded through the building. The mark of the repair, a crack, dirt occur on the surface of the concrete. The conditions of the present outer wall were measured as for the investigation to make a repair plan. The concrete damage of No. 1 building of Musashino Arts University is the mark of the repair:113, crack:21, moss:10, efflorescence:6.

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Recently, we can see the tip system restroom at many stations, Moreover, many of department stores in the center of Tokyo have repaired its restroom. And they obtained the high-class feeling. Consciousnesses of users to the public restroom are changing from “smell, dirty” to “comfortable space”. We researched the restroom, which was newly designed or was repaired. And we found some common features to such toilets. Improvement in appearance and improvement in a function are these. When both these two conditions are fulfilled, the toilet as comfortable space is materialized. These two become an indicator for the toilet installed or renewed after this.

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The average temperature of Tokyo rose 2,9 degrees centigrade in 5 years. Tokyo Metropolis enforced to set the roof garden, the regulation of gasoline as new countermeasure plans. Ponds installed in the building and artificial waterfalls show the effect against the city warming as well as that of the afforestation. As a result of the investigation, the number of ponds in Shinjyuku was biggest in Tokyo Metropolis. The granite occupied 65% of the edge of the ponds. Many water-spaces had lights, sounds or plants in them. Global warming still increase now. To increase water-space with wood is needed to control warming; for the earth to be protected.

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The temporary enclosures were used in order to prevent pepople trespassing upon the dangerous space, such as a construction site, and to divide inside and outside. And there are various types of them according to kinds, form, and such of buildings. First, they are classified into four types.
A. temporary type…What has a minimum function.
B. advanced type…What added options to take local residents into consideration.
C. client type…What has high promotional values to client companies and brands.
D. logo mark type…What takes in the logo marks of construction firms or design offices as designs, and make high promotional values.
And I compared about color tones, designs, etc. of the four types, and also deduced the tendency according to use of buildings of temporary enclosures. And the temporary enclosures has come to play rolls of companies or an effective and pillar of goods by taking in designs to panels now.

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Pencil sharped buildings stands in the area of urban conquestion. They are inferior to ordinary buildings in safety. Especially it is difficult to people to escape from there when it gets fire. We investigated the current problems and situation about 100 buildings at Ginza Chuou-ku Tokyo. Investigate substances are the length and the ratio of the side, the establishment situation of refuge course, the kind of antemural materials, and the kind of signation. We examined the appropriate methed of the pencil sharped buildings, taking into account the above-mentioned findings.

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[in Japanese]

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Renewal of existing buildings is being closely watched due to a decrease in the number of new construction or from the viewpoint of conservation of natural resources. A good many essays have been issued on building repair methods and technique from the general to the particular. Nevertheless, it has not been much disclosed that with what concept or ingenuity, personnel of individual firms or organizations, who is in charge of building maintenance, actually provides services. Even if there were excellent studies on maintenance, it would be nearly valueless from a social standpoint if such studies were not put into practice. Although it is not easy to turn the concept or ingenuity into studies or essays, I dare introduce an example of a concept that a renewal section of a developer has, and hope it will help you to deepen your knowledge about the issue. I hope, in future, that more presentations with a similar viewpoint as this will be made, and that we will have opportunities of exchanging practical opinions on repair methodologies.

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This paper concerns the architectural design methods of reducing LCCO₂ by 30% and prolonging life span by threefold. A model archtecture is proposed to describe its basic concepts and technological means of achieving that aim. LCCO₂ reduction rate is also concerned.

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The reuse of the KABETSUCHI is described.

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This paper shows the result of the freeze/thaw test of several recycled aggregate mortar carried out for the purpose of widely utilizing in cold region. First, the standard which evaluated the frost damage resistance performance was determined. The minimum temperature which once arose in 10 years was divided into 3 levels of −10°C, −14°C and −18°C. The above-mentioned temperature was made to be a factor of the freeze/thaw test. Results of the test which made water cement ratio and air content of the specimens to be the material condition are as follows. It is possible to clarify material condition of the usable recycled aggregate mortar as architecture finish or finish division of the concrete secondary product in the level independence as a cold.

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[in Japanese]

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Plastic wastes such as a PP,PE,PET are drained in large quantities, and it is very important in recycling these materials. When a recycling board is formed by a plastic waste without classification, a bending strength of a recycling board is small, and use as a board is impossible. So a making technology of recycling board is developed by mixing wastepaper and wasteplastic fiber. Characteristics of this study is that wasteplastic is classified by using its melting point and centrifugal force.

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In recent years, sick house is a social problem. As for the measure, material selection, a ventilation plan, and a construction plan are raised. In addition, there is a measure against bake out. However, this method applies temperature to the whole interior of a room. Therefore, this technique may require the load by heat too much according to the kind of material. This research checked the influence of the material by temperature conditions. Specifically, the material which changed temperature conditions was analyzed in the small-scale chamber experiment. Consequently, it was found that the concentration reduction effect changes with substances.

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We developed a floor urethane adhesive that decrease generation of TVOC. For decrease of TVOC, we focused on research & development of huge quantities of raw materials. Measuring method of TVOC is compliant with “Small Chamber System(ADPAC)”. In the test result, the new adhesive was almost not detectable about 13 organic compounds that designated by Health, Labor and Welfare Ministry. The measurement value of TVOC was 305μg/m³, which is lower than interim guideline value(400μg/m³). The marketing plan of the new adhesive is the expansion of indoor versatile application.

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In newly built houses, it is known well that the initial gas concentration rises. The gases evolving from volatile organic compounds (VOC) increase rapidly from the onset of interior finishing work. In most cases, the VOC concentration will not have decreased at the time completion of the building.This research investigates whether the VOC concentration attenuates when ventilation is performed after completing the interior finishing work. The effectiveness of ventilation was studied in the following three cases: 1)use of ventilating openings, 2)use of a ventilating fan and 3)use of an air-cleaning machine. The measurements were carried out for a month in the living room and in a bedroom.It was found that the VOC concentration decreases from the initial stages when the air-cleaning machine is used. In contrast, the concentration increased when the rooms were maintained in a sealed condition.

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[in Japanese]

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A new renewal method for metallic external walls has been developed. The method involves a covering of film that shows superior durability. The plastic film includes adhesive layer, which is covered with release liner. In this report, adhesion and durability were evaluated on aluminum substrate. The plastic film showed enough adhesion and good durability on aluminum alloy. The film application is considered as the new renewal method excellent in durability.

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[in Japanese]

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[in Japanese]

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[in Japanese]

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This report examined deterioration of building stones(granite) to be use exterior wall and column by dry construction method. The examination executed the elements analysis of sealant and stones with FT-IR analysis meter and EDX analysis meter. And there examined a kind of sealant, mixing time of sealant, vacancy or not of primer with artificial promotion testing to can reproduce the deterioration of building stones. As a result. It was found as follows deterioration of building stones was caused by migration from the plasticizer of sealant to the stones in consequence for unsuitable of mixing the base compound with the curing agent and coating primer, and imperfect of back-up material. It was corroborated that special compositeness chelating agent was effective to remove the deterioration of building stones.

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[in Japanese]

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[in Japanese]

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