iMaRRCNewsletter

The National Research and Development Agency
Public Work Research Institute (PWRI)

iMaRRC Newsletter Vol.9 September 2017

Vol.11 July 2018
FRP
Bending tensile test of FRTP cables

FRP -D8?gW kÀ%hMF °ÅS&h®Å{'% #& 9@16@16.B,>D6¬v

FRP cables are known to have good environmental

Y & & FRP -D8?¤]

resistance against corrosion, and are therefore{¯'  FRP -D8? I »r

occasionally applied as PC tendons. Fiber Reinforcedaf{¯'  FRP Y "%N.16]

Thermoplastic Polymer (FRTP) cables have recently¶ Áqlm'Hy COI ¢§9A0*,

been an area of focus owing to their low cost and other6ÇÄ"%GL)B7=/14;©È

beneficial characteristics. The research project titled"¼#&$d¢§} ¢§_[“Construction9@16@16.B,>D6¬vjsystems using innovative materials” conducted by the-D8? tO %ebFigure 1 ¦"Center Of Innovation (COI), managed by the.B,>D6HRc¾Ç E ¾È'· ¿­Kanazawa Institute of Technology, is now continuing

% #Rc¾ % FRP -D8?ws'¥

with research into this field, and the Public Worksº%z³ $RT¾'

Research Institute (PWRI) has joined the project.

 uvpÆ'pPWRI has carried out bending tensile tests of FRTPofnext-generation

infrastructure

&¤]{¯"% FRP -D8?5D3

cables for application in PC tendons with bending

#  af{¯eb

parts, as shown Figure 1 Although the bending tensile"ª% pP  

properties of FRP cables are already well known, thepÆFigure 2 ¦"pÆ²­' |Rcbehavior of FRTP cables under bending tensile¾´s!^x'i]FRP -D8?uvZ'conditions is not. Figure 2 shows the outline of the[£%ws'o

framework used in this test. A short video of this test isalso available on the iMaRRC web page.

¹Æª®Å{S&af{ FRP -D8?'
9@16@16.B,>D6¬v %ebnUC½X·µ`%JoK
FRP -D8?®(?+>{Ç.B,>D6Hw(?+>{È@=,2D/<B¹ÆÇÂÃuvZ' « MZ~ Vb¸QÈFigure 1: Location of PC tendon (FRP cable) in PC beam

'nUC½X % ! ½X  '¸Q% ¶'±JopÆ\¡¨:D0(short video)
http://www.pwri.go.jp/team/imarrc/activity/movie.html

Figure 2: Outline of the bending tensile test of FRTP cable

1

The National Research and Development Agency
Public Work Research Institute (PWRI)

iMaRRC Newsletter Vol.11 July 2018

Bending behavior of precast concrete beams withmechanical splices

PCa
PCa

Enhanced productivity in the construction of concretePCastructures is one of the policy targets of the Ministry ofLand, Infrastructure, Transport, and Tourism. The useiMaRRC

of precast concrete is expected to increase as a labor

PCasaving technique at construction sites.

Figure 3

However, to enhance the use of precast concrete, adesign method for the joints between precast concrete
members should be established.

Figure 4

The iMaRRC and Road Precast Concrete Association
are conducting research on the bending behaviors ofprecast concrete beams with mechanical splices

iMaRRC(Figures 3 and 4), which are laid out in the same

short video

cross-section.

http://www.pwri.go.jp/team/imarrc/activity/movie.html

In a bending test, the influences of the different typesof mechanical splices used and the arrangements ofthe rebars were confirmed. A video showing thePCa  bending test of a RC beam is available on theiMaRRC web page.

PCa   



Figure 3: Example of box culvert with mechanical splices

Figure 4: Examples of mechanical splices
2The National Research and Development Agency
Public Work Research Institute (PWRI)

iMaRRC Newsletter Vol.11 July 2018 Business Trip Report
iMaRRC ÕyB|½ÁfUxDJ½Áf Dr. Itaru Nishizaki and Dr. Tomonori Tomiyama, a chief9:@8AäçReh;@1@{áè+researcher and a senior researcher, at iMaRRC, respectively,Maubin £ò4 ìäÊé?A>@4<2£óÐ-visited Maubin bridge located in the suburbs of Yangon, and,llÓÜñzÂKÑu.

provided technical guidance on a trial repainting of the bridge toÐ# Üñz 9:@8A~ÙProf. Khaing and the graduate students of Yangon Technological¹òMOCó_[C;@1@z¿oqòYangonUniversity (YTU). The trial repainting was conducted by YTU

Technological University, YTUóf(!qµ D

under cooperation of the Ministry of Construction in Myanmar.

L*2018 } 5  28 ô6  1 Ð-,%Three types of painting systems were painted during this trial, andthe durability of the different painting systems will be compared

9:@8A iIåbé£lÓ

in a future study. The students of YTU plan to investigate theí+Ñ ¾Â+ 'lÏÎ

conditions of the painting systems, including changes in the film.^W¶ +   )¼25

thickness and gloss, and a visual inspection of the film@të·»Þ®M¢f(appearance.

Òð·ÔOlÓ.Ì*â+ ²±°²klÓÑdB\*$ ´mI&²kIåXlÓÇærªÈiÝòlÓZCiV³óªzÅ³ª.chÑ¦­b-j­] ,.a +  §$),#YTU ,#j­Ärd Y¥¡ØÜñ¯>7=lÏÍEÜñÃ.s
# GgÜñz,.20A=/36s£ ÍE¡Ú.¸·Ð#Maubin £plÏP±©&HºÃ

Photograph 1: Confirmation of wet film thickness by Dr.ÛNÉ)zS(+ÆÈiÝªTomiyama and YTU graduate students

ær ,Cwê¤$l.«pTlÓ+ *#ïz*ïbì.ËM¢.+Ö $3 lÓÇîr,,vðÀÜñ.s#GYTU qµ r·²i"ß lÏQ¨&Ï`×¬lÏn±ÛNÃãàÝ.Ð
Fr3

The National Research and Development Agency
Public Work Research Institute (PWRI)

iMaRRC Newsletter Vol.11 July 2018

iMaRRC Researchers
1Mr. Kensuke Sakurai has more than 10 years ofexperience studying various issues in the area ofenvironmental protection such as microbiological

10quantification and risk assessment for safe waterreuse, the development of a sewage sludge
incinerator and a vegetation foundation for slope
greening, energy recovery through the anaerobic
digestion of organic waste, and the evaluation ofgreenhouse gas emissions from a waste management
system.
His current research interests center on green waste
utilization as a fossil fuel alternative, and low-energy
technology for wastewater treatment. These research
topics have been selected to meet future social needs,
and he hopes to contribute to the creation of asustainable society based on his studies in theseareas.

327

4iMaRRCMr. Yuya Kato joined iMaRRC as a researcher in
April 2015, prior to which he was engaged in roadmanagement at the Ministry of Land, Infrastructure,

4and Transport (MLIT). One of his current study areas

iMaRRCis focusing on techniques for concrete pavement
repair, and he is developing repair materials that will
not peel off within a short period of time.
His hobby is to visit historical locations such as civilengineering heritage sites. He uses cars and elevators
as seldom as possible to maintain his fitness, andenjoys eating delicious food.

4

The National Research and Development Agency
Public Work Research Institute (PWRI)

iMaRRC Newsletter Vol.11 July 2018

Dr. Yoko Kawashima joined PWRI in 2014. She
has studies methods to evaluate the deterioration ofasphalt binders. She also recently studied repair

26
iMaRRC

materials of concrete pavement and FRP, and isinterested in learning about various civilengineering materials. Dr. Kawashima enjoys
traveling with her family and friends. She tries tofind place where she can visit with her child, whowas born last year. Although she finds it difficult toFRP

balance childcare and work, she believes that her
fulfilling life has also benefited her research.

2iMaRRC

2iMaRRC
2.

iMaRRC

2
Announcement of upcoming events
The 2nd iMaRRC Seminar will be held at Epocal
Tsukuba on the afternoon of 1 August of 2018. TheiMaRRC

theme of the 2nd iMaRRC Seminar is “Present states
30

8113 20 16 45
8iMaRRCand the future of lifetime prediction of painting
systems for construction structures.” We lookforward to many people joining this seminar. For
more information, please see the iMaRRC web page.

iMaRRC Newsletter:()(iMaRRC)
Tel: 029-879-6761 Fax: 029-879-6733 Email: imarrc pwri.go.jp

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