AIJ Journal of Technology and Design
Online ISSN : 1881-8188
Print ISSN : 1341-9463
ISSN-L : 1341-9463
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Volume 20, Issue 45
Displaying 1-50 of 70 articles from this issue
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Materials and Construction
  • CARBONATION RATE COEFFICIENTS OF THE CONCRETES USING MEDIUM HEAT PORTLAND CEMENT WITH FLY ASH
    Fumio OSHIDA, Toshio YONEZAWA, Daisuke HONMA, Yoshihiro YAMAGUCHI, Hir ...
    2014 Volume 20 Issue 45 Pages 451-456
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.451
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    The carbonation rate coefficient of the medium heat Portland cement with fly ash was studied in both accelerated and natural exposure test conditions. The coefficient of the cement was higher than that of ordinary Portland cement (N cement) by 1.5 to 2.0 times under accelerated test conditions when water to binder ratio was 60%, but it was nearly the same with that of N cement under out door exposure test conditions. The cement factor (α2) of the cement was calculated to be 1.1 and the environment related factor (β3) was to be 3.5 according to the carbonation rate coefficient equations by the AIJ durability design recommendation.
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  • EFFECT OF MIXING TIME ON DEFORMATION AND STRENGTH OF WALL CLAY
    Naoki UTSUNOMIYA, Shigeji TAKAHASHI, Mitsuhiro MIYAMOTO, Minoru YAMANA ...
    2014 Volume 20 Issue 45 Pages 457-460
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.457
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    The mixing time of wall clay is decided based on experience and intuition of plasterers. There is no clear description about the mixing time of wall clay. In this study, the load electric power of bi-axial forced mixer is measured to grasp the optimal mixing time of wall clay. The influence of mixing time on the mechanical characteristics of wall clay is examined based on the unconfined compression tests for every mixing time. As a result, the optimal mixing time of wall clay with much clay fraction is estimated to be about 50 minutes in the range of this study.
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  • STUDY ON CONTROL METHOD FOR JOINT MORTAR STRENGTH OF CONCRETE BLOCK MASONRY WITH SCRATCH
    Takuya HASEGAWA, Osamu SENBU
    2014 Volume 20 Issue 45 Pages 461-465
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.461
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    This paper deals with the estimation method of joint mortar strength in CB masonry with scratch for the quality control. According to the test results, it was found the correlation between strength and width of scratch. The test results also showed that the surface roughness and the moisture content in joint affected the width of scratch. The width was increased with increase of the moisture content and the surface roughness. Water absorption amount of CB from mortar depended on the mortar type, CB type and joint width and it was found that mortar strength was reduced by water absorption of CB. Finally, we proposed an estimation method for joint mortar strength using the scratch test and quality control method on the basis of these results.
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  • DEVELOPMENT OF SCREW STEEL PIPE PILE WITH TOE WING HAVING AN INNER WING
    Toshihiro YOSHIZU
    2014 Volume 20 Issue 45 Pages 467-470
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.467
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    I have developed a screw steel pipe pile with toe wing having an inner wing. In this paper, I did a load test in ground of cohesive soil and sandy soil. As a result, for ultimate bearing capacity of the toe wing, I found the following. By applying the bearing capacity formula of sandy soil, bearing capacity factor can be set to 250. Further, by applying the same formula, pile toe effective area may be 0.5 times of the inner blade and blade toes. Pile head settlement amount was found to be below allowable settlement in the continuous footing.
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  • VERIFICATION ON ASBESTOS RELEASE DURING SURFACE PREPARATION OF DETERIORATED ASBESTOS CONTAINING CEMENT SHEETS
    Comparison among substrate preparation methods Part2
    Junko KOGA, Akihito HAYASHI, Kenji MOTOHASHI, Masataka TAMURA
    2014 Volume 20 Issue 45 Pages 471-476
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.471
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    Asbestos cement sheets used under outdoor condition may need surface treatment because of deterioration. Surface preparation of deteriorated asbestos cement sheets may cause asbestos fibers release during surface preparation. In former study, airborne fibrous particles concentration was measured under several ways of surface preparation of existed deteriorated cement sheets containing asbestos. In this study, some substrate preparation methods were added, and airborne fibrous particles concentration was measured under those surface preparation methods, for the purpose of verification on safety of substrate methods and asbestos release during surface preparation.
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  • DEVELOPMENT OF CAPACITANCE TYPE COMPACT WETTING SENSOR SYSTEM AND SELECTIVE DETECTION OF FLOW CONDITION OF WATER FILM
    Satoshi FUJIMOTO, Takaaki OHKUBO, Kanae KOMIYA
    2014 Volume 20 Issue 45 Pages 477-482
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.477
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    Water leakage and dew condensation at residential attics are major cause for complaints in construction works. Discriminating these two phenomena is important, since countermeasure works for these two phenomena are different. This paper firstly proposes a wetting sensor monitoring system to detect these water films in attics. Secondary, sensor system stability under temperature, humidity change and chronic measurement is evaluated. Lastly, discrimination method for difference in flow conditions of water leakage and dew condensation is proposed.
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  • MAINTENANCE OF TOKYO TOWER BY COATING SYSTEMS
    Satoru OHSAWA, Kenji MOTOHASHI
    2014 Volume 20 Issue 45 Pages 483-486
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.483
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    Tokyo Tower has passed for 55 years till today at the end of 1958 since completion. In the meantime, though it is a large-sized steel construction which is easy to corrode, by suitable maintenance preservation by coatings, without spoiling a fine sight function, a ground protection feature, etc., the function it is supposed that it is as a communications tower and a sightseeing spot is held, and nine renewal coating work is carried out till the present.
    This paper reports the maintenance preservation by the application coating systems at the time of this construction, and subsequent whole surface renewal coatings.
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  • STUDY ON ESTIMATING STRENGTH OF HIGH STRENGTH CONCRETE
    –Experimental studies of several non-destructive inspection for concrete and concrete core strength using mock-up mass concrete specimen at 5 years age–
    Masanori TSUZUKI, Yasumichi KOSHIRO, Minoru FUSHIMI, Masazumi NAKAO
    2014 Volume 20 Issue 45 Pages 487-490
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.487
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    The purpose of this study is to establish strength estimation method for high strength and mass concrete using non-destructive inspection method. In this study, Experimental studies of non-destructive inspection and concrete core strength for 5 years age are carried out and the following conclusions are drawn. With the proposed estimate equation using single rebound-hummer method in this study, it is judged that the compressive strength of concrete structure can presume. And the analysis shows that the combination of rebound-hummer method and elastic-wave propagation method gives more accurate estimation equations than the single method.
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  • INVESTIGATION OF MIXED WASTE PROCESSING AND THE ADAPTABILITY OF PVC TILE CARPET TO RECYCLING
    Kohei YAMAGUCHI, Akio KOYAMA
    2014 Volume 20 Issue 45 Pages 491-496
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.491
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    For the purpose of making a model for the recycling of construction mixed waste, this research conducted investigation and an experiment on the applicability of recycling about PVC tile carpet.
    The amount of discharge and state of construction mixed waste which specifically tend to become ambiguous were investigated, and the rate of the recyclable article was clarified. Moreover, the influence of the impurities in PVC waste on recycling sheet was clarified.
    From these results, a tile carpet can be efficiently recyclable, if appropriate source segregation is performed.
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  • QUESTIONNAIRE SURVEY ON WASTE TREATMENT AND CONSCIOUSNESS OF BUILDING MATERIALS MANUFACTURERS, CONSTRUCTORS AND INTERMEDIATE TREATMENT FACILITIES
    Ken-ichi IMAGAWA, Akio KOYAMA
    2014 Volume 20 Issue 45 Pages 497-502
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.497
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    For construction of the resources recycling society, promotion of the recycling of the construction waste is strongly demanded. In this paper, we thought that the consensus building between companies concerned with recycling was indispensable for the recycling promotion, and tried to clarify how it was shared consciousness between companies at the present by questionnaire.
    The result of questionnaire showed that those companies working on reduction and recycling of construction waste, and the tripartite consciousness is unified in principle.
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  • RESEARCH ON CONSTRUCTION OF TEMPORARY HOUSES IN FUKUSHIMA
    Tsuyoshi SEIKE, Haruka YOSHIBA, Yongsun KIM
    2014 Volume 20 Issue 45 Pages 503-508
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.503
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    In a disaster, temporary houses are generally constructed by builders belong to a certain organization. On the other hand, in the Great East Japan Earthquake Disaster, other builders constructed ones too, because it was necessary for victims to a large number of temporary houses. So, various types of temporary house were constructed in the disaster. Therefore, we investigated the actual situation and problem about construction of various temporary houses in Fukushima by interview and questionnaire. We expect survey results to be useful in future disasters.
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Structures
Fire Safety
  • A STUDY ON SMOKE BEHAVIOR IN A COMPARTMENT WITH SPRINKLER SYSTEM ACTIVATION
    –Full scale compartment test using wood crib as fuel–
    Mitsuru OTA, Yoshifumi OHMIYA, Ken MATSUYAMA, Masaki NOAKI, Jun-ichi Y ...
    2014 Volume 20 Issue 45 Pages 587-592
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.587
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    The smoke behaviors are simulated without the effect of the sprinkler activation by the fire safety design. As one of the reasons, the studies on smoke behavior with sprinkler activation are hardly studied. Experiments were conducted on a full-scale test using wood crib as fuel, and the following results were obtained; the heat release rate decreased by effect of water spray. But the burning was continued in some experiments. The temperature and CO2 density of the upper layer was decreased, and the lower layer was raised by effect of water spray.
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  • BURNING EXPERIMENTS ON WALLS USING WOODEN INTERIOR FINISH WITH SPRINKLER ACTIVATING
    Masaki NOAKI, Minoru SUZUKI, Jun-ichi SUZUKI, Jun-ichi YAMAGUCHI, Yosh ...
    2014 Volume 20 Issue 45 Pages 593-598
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.593
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    Several experiments were carried out to grasp burning behavior of wall using wooden interior material with sprinkler activating in unenclosed space. As for specimens, Japanese cedar plywood (24 mm thick) and lumber core plywood (12 mm thick) were selected. The size of specimens was 1820 mm wide and 2730 mm high. Regarding the experimental conditions, the incident heat flux onto the specimens by heat source was about 30 kW/m2 at the distance of 455 mm from the bottom of the specimens, and water supply rate was 80 L/min. As the result of the experiments, heat release rate reached about 300kW which was one of heat source after sprinkler activated. Char depths of the sprinkled specimens were less than 3mm.
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  • A PROJECT EXCLUDED FROM INTERIOR FINISHING RESTRICTION BY THE VERIFICATION METHOD FOR FLOOR EVACUATION SAFETY
    Yoshikazu DEGUCHI, Tsutomu NAGAOKA, Tomohito OKAZAKI, Tomoyuki SHIRAHA ...
    2014 Volume 20 Issue 45 Pages 599-604
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.599
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    From the viewpoints of environmental issue and forest protection, promotion of the use of wood is demanded. On the other hand, construction of a large-scale fire proof wooden building is possible legally, but the realization is difficult. In such a background, we planned the wooden structure office with wooden interior finishing in Osaka.
    In this paper, process of exclusion from application of interior finishing restriction by use of results of full-scale interior finishing fire spread experiments.
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  • FIREBRAND DEPOSITION AND MEASUREMENTS OF COLLECTED FIREBRANDS GENERATED AND TRANSPORTED FROM A FULL-SCALE BURN TEST USING A LARGE WOODEN BUILDING
    Yoshihiko HAYASHI, Takahiro HEBIISHI, Junichi IZUMI, Tomohiro NARUSE, ...
    2014 Volume 20 Issue 45 Pages 605-610
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.605
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    The fire experiment was conducted in Tsukuba in February, 2012 for studying a feasibility of a large wooden building. The building went up in flames and a large number of firebrands were generated and transported by the wind. After the experiment, firebrands deposited in every location were collected and each total mass was measured. Consequently, the extent of the firebrand deposition and the distributions of the firebrand deposition density were obtained. The measurements of projected area, mass and volume of each firebrand revealed that the firebrand mass density and dimensions decreased with a distance from the fire.
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Environmental Engineering
Architectural Planning and Design
Urban Planning
  • THE FORMATIVE PROCESS AND SITE RATE OF WEST SHRINE TOWN IN MIYAJIMA ISLAND
    Tatsuya KOMAI, Hiroshi MORIYASU, Mahito NAKAZONO, Akira USHIJIMA
    2014 Volume 20 Issue 45 Pages 707-712
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.707
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    This study mainly clarifies formative process and site rate of the west shrine town in Miyajima. The major findings are as follows. The formation of the town was made in early the year 1500 in the wake of the formation of temples and shrines the year 1300-1168. Since then, houses crowded by the increase in population, the formation of a new town was made mid-16 and 17th century. After the reclamation of coast, town was again expanded the frontage to reclaimed area. In addition, the site had been integrated in many places.
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  • THE TRANSFORMATION OF “HUTONG” IN THE SQUARE CITY OF SHENYANG, CHINA
    –Study on buffer zone of World Heritage–
    Li QIN, Yuichi FUKUKAWA
    2014 Volume 20 Issue 45 Pages 713-718
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.713
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    This study focuses on the process whereby “Hutongs” (urban alleys) have been destroyed in the Buffer Zone of Shenyang Imperial Palace. (World Heritage Site), based on analysis of old maps. It emerges that over half of these old alleys were swept away in the course of rapid urban redevelopment, to make way for commercial buildings and apartment houses. The paper concludes that the remaining Hutongs and their values could be important in furthering historical conservation and future planning in this area.
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  • THE LANDSCAPING STANDARDS IN THE LANDSCAPE PLANNING AREA COVERING THE IMPORTANT CULTURAL LANDSCAPE
    –Focusing on the differences from the normal area–
    Yoichi IMAMURA
    2014 Volume 20 Issue 45 Pages 719-722
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.719
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    The purpose of this study is to clarify the difference of the landscaping standard from the normal landscape planning area and the landscape planning area covering important cultural landscape through the analyzing 19 important cultural landscapes designated by August 2010. I can point out that there are 3 types as the differences, and that some standards bring the important view points. I can also point out the regulations working to strengthen the character of cultural landscape are few.
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  • THE PRESENT CONDITIONS AND PROBLEMS OF THE PROPER MANAGEMENT REGULATIONS OF VACANT HOUSES
    As an example of local governments in eastern Japan
    Hiroshi SHINOBE, Tomohiro URABE
    2014 Volume 20 Issue 45 Pages 723-726
    Published: June 20, 2014
    Released on J-STAGE: June 20, 2014
    DOIhttps://doi.org/10.3130/aijt.20.723
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    The purpose of this study is to examine the methods for properly managing the vacant houses. In particular, this paper reports the present conditions and problems of proper management regulations of vacant houses by local governments. The analysis data base on questionnaires for 807 local governments in eastern Japan. The main purpose of proper management regulations of vacant houses is to ensure the resident’s security and relief in usual. In addition, it has become easy to instruct owners of vacant houses by enforcing regulations.
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