Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 48, Issue 2
Displaying 1-15 of 15 articles from this issue
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  • Quality Assessment of Ready-Mixed Concrete by Constructor
    H. Taniguchi, M. Higuchi, M. Fujita, H. Kawano
    2010 Volume 48 Issue 2 Pages 2_15-2_23
    Published: 2010
    Released on J-STAGE: March 27, 2012
    DOIhttps://doi.org/10.3151/coj.48.2_15
    JOURNAL FREE ACCESS
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    This report describes the results of the realities investigations of ready-mixed concrete and the quality assessment examinations using the aggregates collected from ready mixed concrete plants. The plant investigations showed the realities of the water content, cement content and water-cement ratio in a standard admixture. The influence which the aggregate exerted on compressive strength, the modulus of Young's elasticity, autogenous shrinkage, drying shrinkage and coefficient of thermal expansion was clarified by the examinations. Notes in construction were described to the results of the investigations and the examinations.
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  • Compressive Behavior of Joint Mortar on Ultra High Strength Precast Concrete Columns
    K. Imai, A. Hattori, D. Iwamuro, H. Inada
    2010 Volume 48 Issue 2 Pages 2_24-2_30
    Published: 2010
    Released on J-STAGE: March 27, 2012
    DOIhttps://doi.org/10.3151/coj.48.2_24
    JOURNAL FREE ACCESS
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    A compression test for concrete-mortar-concrete specimens has been developed to investigate the compression behavior of the joint mortar between two ultra-high-strength precast concrete columns. A method for estimating the compressive strength from the strength values of constituent materials is proposed. Long-term loading tests confirmed that the joint mortar remains stable over a long period of time even under high stress. The compression test was also used as a joint mortar strength control test for a practical building. The test results indicate that the newly developed test can be used to obtain reliable strength test results under accuracy conditions of specimen fabrication and precise loading.
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