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http://dx.doi.org/10.14190/JRCR.2020.8.4.490

Contribution of Two-Stage Mixing Approach on Compressive Strength of Mortar Made of Recycled Fine Aggregate  

Kim, Yu-Jin (Department of Architectural Engineering, Pukyong National University)
Kim, Gyu-Won (Department of Architectural Engineering, Pukyong National University)
Chung, Chul-Woo (Division of Architectural and Fire Protection Engineering, Pukyong National University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.8, no.4, 2020 , pp. 490-497 More about this Journal
Abstract
This work has been initiated to find possibility whether recycled fine aggregate can be used as a source of aggregate for structural concrete or not. Two-stage mixing approach was chosen in order to maximize strength potential from recycled fine aggregate. Moisture content of the recycled fine aggregate was changed, and two different types of two-stage mixing approaches were applied to produce cement mortar. The strength of mortar made of 100% recycled fine aggregate by two-stage mixing approaches was compared to that of mortar made of 100% washed sea sand. According to the results, the effect of moisture content on compressive strength was observed from low water cement mortar(W/C 0.3). In case of W/C 0.5 cement mortar, no clear relationship was observed between moisture content and strength development. It was found that two-stage mixing approach has a potential to increase the strength of mortar made of 100% recycled fine aggregate. In case of modified version of two-stage mixing approach which first prepares cement paste and pours recycled fine aggregate into the cement paste, was more effective to increase the strength of mortar made of 100% recycled fine aggregate.
Keywords
Two-stage mixing approach; Recycled fine aggregate; Moisture content; Compressive strength;
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