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http://dx.doi.org/10.14190/JRCR.2021.9.1.66

Evaluation on Workability and Compressive Strength Development of Concrete Using Modified Fly-Ash by Vibration Grinding  

Ahn, Tae-Ho (Department of Architectural Engineering, Gradute School, Kyonggi University)
Yang, Keun-Hyeok (Department of Architectural Engineering, Kyonggi University)
Jeon, Young-Su (Sampyo P&C)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.1, 2021 , pp. 66-74 More about this Journal
Abstract
The objective of this study is to evaluate the practical application potential and limitations of the modified fly ash(MFA) by vibration grinding as a partial replacement of ordinary portland cement(OPC). The test parameters investigated were the replacement level of fly ash(FA) and FA for OPC, varying from 10% to 40%, and curing temperatures of 5, 20, and 40℃. The various characteristics(including slump, air content, bleeding, setting time, compressive strength development, and hydration products) of MFA concrete were measured and then compared with those of the concrete with conventional FA. Test resul ts showed that the MFA prefers to FA in reducing the bl eeding of fresh concrete and enhancing the compressive strength gain at an early age. The compressive strength ratios between MFA and FA concrete specimens at an age of 1 day were 135%, 146%, and 111% at the curing temperatures of 5, 20, and 40℃, respectively. The corresponding ratios at an age of 28 days were approximately 110%, regardless of the curing temperatures. The X-ray diffraction analysis also revealed less calcium hydroxide products in MFA pastes than in FA pastes.
Keywords
Modified fly-ash; Workability; Compressive strength; Hydration products;
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