Quarterly Report of RTRI
Online ISSN : 1880-1765
Print ISSN : 0033-9008
ISSN-L : 0033-9008
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Volume 51, Issue 1
Displaying 1-9 of 9 articles from this issue
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PAPERS
  • New Concrete with Low Environmental Load Using the Geopolymer Method
    Motoki UEHARA
    2010 Volume 51 Issue 1 Pages 1-7
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.1
    JOURNAL FREE ACCESS
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    The compressive strength of geopolymer-hardened materials such as mortar or concrete shows a linear relationship with the alkali/water content (molar ratio) of the alkali silicate solution used in their production. Geopolymer mortar and concrete have excellent properties of chemical durability such as alkali-aggregate reaction resistance and acid resistance. Potassium increases the fluidity of fresh geopolymer mortar and concrete, and this fluidity enables the creation of a hardened paste featuring higher strength with high alkaline concentrations. In this study, an environmentally friendly geopolymer PC sleeper was prepared using fly ash and alkali silicate solution. The sleeper satisfies the performance specifications of JIS E 1202.
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  • Environmental Evaluation of Railway Material Changes Using LCA
    Naoki AIHARA, Taro TSUJIMURA
    2010 Volume 51 Issue 1 Pages 8-11
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.8
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    As means of the reduction of the environmental load, the change of the materials of the product is thought about. In order to grasp the load quantitatively, life cycle assessment is performed.
    In this report, the matter that we should pay attention to about environmental load of the materials of the railway is explained. In addition, as examples of evaluation of CO2 reduction effect, geo-polymer concrete production and the maintenance reduction effect resulting from the use of carbon contact strips on pantograph head are shown.
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  • Fundamental Study on the Application of Traction Oil as a Wheel/Rail Lubricant
    Yasutomo SONE, Junichi SUZUMURA
    2010 Volume 51 Issue 1 Pages 12-17
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.12
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    This study focused on attempts to use traction oil as a wheel/rail lubricant. Traction oil is a recently developed lubricant material, and is thought to provide a higher traction coefficient than conventional lubricating oil. In laboratory tests, a traction coefficient of 0.14 was obtained for traction oil, and the relationship between traction coefficients and slip rates was found to depend mainly on the oil type. It was also clarified that the anti-wear properties of traction oil could be controlled using a certain quantity of anti-wear additive. It has been proved that traction oil is promising as a wheel/rail lubricant, but further efforts are required to clarify the related effects on other significant factors such as lateral force.
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  • Development of a Measuring Method for Microbial Degradation of Environmental Pollutants
    Minoru SHIMURA
    2010 Volume 51 Issue 1 Pages 18-22
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.18
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    Pollution of soil and underground water, including leakage of gasoline from subterranean storage, poses a significant risk to living organisms. An approach using microorganisms to remediate polluted environments is applicable to locations beneath buildings and bridges. However, no monitoring method for bioremediation activity in soil has yet been developed. It is essential to estimate biological activity in soil to proceed with remediation activity. Accordingly, we established a method that combines bacteria detection in soil using spectral analysis with the use of genetically modified bacteria that release green fluorescence with remediation activity.
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  • Experimental Investigation of Low-frequency Wayside Noise from High-speed Train
    Hajime TAKAMI, Katsuhiro KIKUCHI
    2010 Volume 51 Issue 1 Pages 23-28
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.23
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    The authors performed laboratory experiments and field measurements to investigate low-frequency noise generated in wayside environments from high-speed train running. The results indicated the following three types of low-frequency sound sources: pressure fields around the nose and tail parts of the train, low-frequency acoustic pressure waves aerodynamically caused by the train itself, and noise radiation from vibrating concrete railway viaducts. Measurements conducted in a higher-speed section revealed that the major sound source of low-frequency noise in the far field was aerodynamically generated unsteady flow, which is analogous to a line source.
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  • Methods for Analysis of Odor-related Volatile Compounds in Railway Facilities
    Takashi KYOTANI, Tamami KAWASAKI, Tomoyoshi USHIOGI, Toshio HAYAKAWA
    2010 Volume 51 Issue 1 Pages 29-32
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.29
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    Formally, the authors carried out investigation of railway passenger awareness regarding hygiene and studied airborne microbes in railway stations. The results indicated that volatile compounds released from fungi partially caused odors in stations, and analysis of these compounds was performed. SPME (solid phase microextraction)-GCMS (gas chromatography-mass spectrometry) was adopted as a method of analysis for airborne volatile compounds, and analytical conditions were investigated. The technique was applied to the analysis of air in the field, and it was found that different results were obtained from separate locations where differing odors prevailed. In this way, it was confirmed that the method was suitable for field analysis.
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  • Evaluation of Applicability for Ni-advanced Weathering Steels and Bridge High-performance Steels to Railway Steel Bridges
    Ichiro SUGIMOTO, Kenji KITA
    2010 Volume 51 Issue 1 Pages 33-37
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.33
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    The design standard for railway steel structures and composite girders was recently revised, and its range of applicability was extended to recently developed steel materials including Ni-advanced weathering steels and Bridge High-performance Steels (BHS). Ni-advanced weathering steels can be applied without painting to bridges in corrosive environments, while BHS materials feature high strength and enhanced weldability. This paper explains the method of evaluation for the applicability of Ni-advanced weathering steels from the results of exposure tests, and outlines the advantages of BHS application to railway bridges from the results of trial design.
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  • Fatigue Design in Consideration of Simultaneous Train Loading on Double-track Bridges
    Yusuke KOBAYASHI, Ichiro SUGIMOTO
    2010 Volume 51 Issue 1 Pages 38-41
    Published: 2010
    Released on J-STAGE: March 03, 2010
    DOIhttps://doi.org/10.2219/rtriqr.51.38
    JOURNAL FREE ACCESS
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    With the recent dramatic increase in the daily number of vehicles running on train lines, considering the effects of simultaneous train loading on double-track bridges has become a significant factor in fatigue design for railway steel bridges. In this research, we assessed the effects of simultaneous loading considering several parameters by applying Monte Carlo simulation, and evaluated each parameter's degree of contribution to fatigue damage in simultaneous loading. Using the results obtained, we proposed a new method for practical design calculation that can easily be adopted to consider simultaneous loading on double-track bridges using a coefficient.
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