STUDY OF SEGREGATION, COMPRESSIVE STRENGTH, AND CARBONATION OF HIGH FLOW CONCRETE REQUIRING COMPACTION WHEN FILLED BY VIBRATORY COMPACTION

TOKIMASA Ukyo, SHINMI Tatsuo, KATO Hiroyoshi

doi:10.14250/cement.77.403

<p>In this study, we compared the properties of “High-flow Concrete Requiring Compaction” and plain concrete subjected to compaction and gap passing effects in a box filling tests. Firstly, coarse aggregate settlement tests and box filling tests were used to evaluate resistance to segregation when “High-flow Concrete Requiring Compaction” was subjected to compaction and gap passing forces. As a result, segregation did not occur in "High-flow Concrete Requiring Compaction" when compaction time was properly controlled. Secondly, the gap pass speed was measured by a box filling test, and the results showed that "High-flow Concrete Requiring Compaction" was significantly faster than plain concrete. Thirdly, the change of compressive strength is evaluated when “High-flow Concrete Requiring Compaction” was subjected to compaction and gap passing forces. As a result, the compressive strength of the “High-flow Concrete Requiring Compaction” did not decrease under the influence of compaction and gap passing forces. Finally, the carbonation resistance of “High-flow Concrete Requiring Compaction” and plain concrete was compared. The results confirmed that the carbonation depth and carbonation rate coefficient of “High-flow Concrete Requiring Compaction” and plane concrete are comparable. Furthermore, the carbonation resistance of “High-flow Concrete Requiring Compaction” was not affected by the compaction and gap passing forces. The same results as above were confirmed for "High-flow Concrete Requiring Compaction" with mixed cement.</p>

STUDY OF SEGREGATION, COMPRESSIVE STRENGTH, AND CARBONATION OF HIGH FLOW CONCRETE REQUIRING COMPACTION WHEN FILLED BY VIBRATORY COMPACTION

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