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I1€=‘1i'1'.111IE.Eiiriri=E1515=E=33=E=$:1:1i=E=E=§5E=i=i:E1i;1;E;i1'125:‘zgigigirigigigigigig. l .;z=;=z:;:a=;:z‘>., 5 * + < ¢ »§;:;2;2;z:2:a>:-;s;§=aa;-'2::.-=;‘_=;;e;=;t;z;.;;‘- rE=E=5'E§E=5;E5:=E5=.EE>;:§5==5i=-=5===1=E15=Z=?.=.<i-=€"='1=%E%==¥i;E=E=£ _=§2:i&i2ii§§"= Koichi AYUTA Hiroshi SAKURAI Kan-ichiro TANABE SYNQPSIS The standard microscopic technique for the characterization of air-voids in hardened concrete accords with ASTM C457, but iii a time—consuming process requiring much effort. Recently, a technique based on an image analyzing system has been developed in order to eliminate these difficulties. However, the specimens analyzed by this system have to be given a surface treatment to make visible the air-voids in the cement paste matrix. This paper describes the operation of the new automatic quantitative image analyzing system which measures difference in intensity of reflected illumination from non—treated specimens. The surface of a specimen is illuminated from three directions. The time required to measure the air—void system of a 10 cm—square specimen is approximately one hour. K. Ayuta is a professor at Department of Civil Engineering of Kitami Institute of Technology, Kitami, Hokkaido, Japan. He received. his doctorate in engineering from Hokkaido University in 1983. His research interests include the durability of concrete structures in cold regions, cold weather concreting and marine concrete. He is a member of JSCE, JCI and ACI. H. Sakurai is an assistant professor at Department of Developmental Engineering of Kitami Institute of Technology, Kitami, Hokkaido, Japan. He received his doctorate in engineering from Hokkaido University in 1992. His research has been on prediction and evaluation of service year of concrete structures in cold regions. He is a member of JSCE, JCI and ACI. K. Tanabe is ea chief engineer en: Nireco Corporation,. Tokyo, Japan. He graduated from Kohgakuin Institute of Technology in 1975. His research interests include the image analyzing system. — 291 —
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CONCRETE LIBRARY OF JSCE NO. 19, JUNE 1992
IMAGE ANALYSIS OF AIR-VOID SYSTEM IN HARDENED CONCRETE
(Translation from Proceedings of JSCE,.No. 420/V—13, Aug. 1990)
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Koichi AYUTA Hiroshi SAKURAI Kan-ichiro TANABE
SYNQPSIS
The standard microscopic technique for the characterization of air-voids inhardened concrete accords with ASTM C457, but iii a time—consuming processrequiring much effort. Recently, a technique based on an image analyzing systemhas been developed in order to eliminate these difficulties. However, thespecimens analyzed by this system have to be given a surface treatment to makevisible the air-voids in the cement paste matrix. This paper describes theoperation of the new automatic quantitative image analyzing system whichmeasures difference in intensity of reflected illumination from non—treatedspecimens. The surface of a specimen is illuminated from three directions. Thetime required to measure the air—void system of a 10 cm—square specimen isapproximately one hour.
K. Ayuta is a professor at Department of Civil Engineering of Kitami Instituteof Technology, Kitami, Hokkaido, Japan. He received. his doctorate inengineering from Hokkaido University in 1983. His research interests includethe durability of concrete structures in cold regions, cold weather concretingand marine concrete. He is a member of JSCE, JCI and ACI.
H. Sakurai is an assistant professor at Department of Developmental Engineeringof Kitami Institute of Technology, Kitami, Hokkaido, Japan. He received hisdoctorate in engineering from Hokkaido University in 1992. His research hasbeen on prediction and evaluation of service year of concrete structures in coldregions. He is a member of JSCE, JCI and ACI.
K. Tanabe is ea chief engineer en: Nireco Corporation,. Tokyo, Japan. Hegraduated from Kohgakuin Institute of Technology in 1975. His researchinterests include the image analyzing system.
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