Effects of Placement Interval of High-Fluidity Concretes

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Title: Effects of Placement Interval of High-Fluidity Concretes

Author(s): K. Fujii, T. Kemi, G. Shimizu, M. Sakuta and Y. Unisuga

Publication: Special Publication

Volume: 179

Issue:

Appears on pages(s): 981-994

Keywords: carbonation; flexural strength; high-strength lightweight concrete; joints (junctures) placing

Date: 6/1/1998

Abstract:
High fluidity concrete has been used to meet requirements for the marine construction thanks to its superior durability and ease of placing. High-fluidity concrete is, however, so viscous and has less bleeding to have the cold joint that may harm the uniformity of the structure. We have executed series of experiments to study the effect of interval and method of making joints on the strength of placing-joint of 5 types of high-strength and high-fluidity concrete and high-fluidity lightweight concrete for the marine construction . The strength of the placing-joint has shown no substantial degradation compared to those without placing-joint by rodding the joint within 120 minutes after the first placing under an ambient temperature of 20 C, while specimens without rodding, cured under the standard water bath, have shown 2/3 of the strength of those without placing-joint at an interval of placement less than 60 minutes.