Concrete Journal

State of the Art of High Performance Fiber Reinforced Cement Composite Research and Structural Application

T. Kanda, N. Sahata, M. Kunieda, K. Rokugo

2006 Volume 44 Issue 3 Pages 3-10
Published: March 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.3_3

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High performance fiber reinforced cement composites has attracted interests in the world, with which active researches have been conducted. HPFRCC is a cement material which is characterized by pseudo strain hardening tensile behavior and crack opening controlling function. A special version of HPFRCC, ECC, is well known due to its high performance and practical properties on site. Reinforced ECC has a potential which may be utilized as a major structural system following reinforced concrete and pre-stressed concrete structures. This report summarizes ECC's mechanical properties and durability clarified in past studies. State of the arts in terms of ECC's application in fields is also described.

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Material Properties of Ductile Fiber Reinforced Cementitious Composite Using Recycled Fine Aggregate

K. Watanabe, T. Ohoka, S. Hakuto

2006 Volume 44 Issue 3 Pages 11-18
Published: March 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.3_11

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Recently, research and development of the ductile fiber reinforced cementitious composites (DFRCC) superior to the existing ones have been actively conducted. DFRCC is a cementitious composite material reinforced with fibers, and it represents crack dispersing properties under tensile, flexural or compressive stress. The use of DFRCC as an energy absorption device will be one of the applications to reduce seismic response of structure. Using DFRCC instead of concrete will also enhance the durability of RC structures. In this study, fiber reinforced mortar specimens using recycled fine aggregate were tested under compressive, split tensile and 3-point flexural loading. To investigate applicability of DFRCC to Precast Piles, the finite element analyses of Precast Piles were also conducted.

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The Resistance to Sulfuric Acid Attack in Cementitious Materials with Iron-blast-furnace Slag

M. Ichitsubo, T. Yamaguchi, I. Horiguchi, K. Takemura

2006 Volume 44 Issue 3 Pages 19-25
Published: March 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.3_19

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In recent years, a great deal of effort has been made on durability of concrete structures in the field of water supply and sewerage. What seems to be lacking, however, is the durability of concrete structures. There are few investigations toward the resistance to sulfuric acid attack in cementitious materials. Accordingly, the main purposes of this paper are to investigate the resistance to sulfuric acid attack in cementitious materials with iron-blast-furnace slag. In addition, the characteristic of sewage disposal and significance of resistance to sulfuric acid attack in Upflow Anaerobic Sludge Blanket system are presented.

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Measurement of Autogeneous Shrinkage of Concrete in Massive Structure and an Example of Control Method of that

T. Ohtomo, N. Nito, A. Hiroshima, S. Miyazawa

2006 Volume 44 Issue 3 Pages 26-33
Published: March 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.3_26

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Volume change property of concrete measured by embedded strain meter under the different thermal history from hydration in the structure or high temperature curing like that was examined. And the influence of kinds of cement, mix proportion and temperature rising history for the autogeneous shrinkage property of concrete was estimated. In regard to the concrete using blast-furnace slag cement type B that would be grown the autogeneous shrinkage remarkably from the knowledge as a result of above investigations, we proposed the control method for the shrinkage compensating by material improvement of cement and confirmed the effect of this treatment on the crack control performance in real construction works of mass concrete.

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Seismic Performance of Concrete Piers Deteriorated by Alkali Silica Reaction

K. Osada, K. Ono, T. Maruya, S. Ikeda

2006 Volume 44 Issue 3 Pages 34-42
Published: March 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.3_34

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It has been reported that reinforcing bars are broken at the bending position due to concrete expansion caused by alkali silica reaction. However, most of the structures deteriorated by alkali silica reaction with no broken reinforcement have not been inspected in detail and effective countermeasures have not seen yet. This report shows that reinforcing steel strain of concrete substructures deteriorated by alkali silica reaction is almost 1000μ through the nationwide survey and that no clear degradation of bending load capacity was observed by static reversed cyclic loading test using beam specimens expanded by alkali silica reaction with steel strain of under 1000μ.

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese]

2006 Volume 44 Issue 3 Pages 44-48
Published: March 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.3_44

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

2006 Volume 44 Issue 3 Pages 49-54
Published: March 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.3_49

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