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http://dx.doi.org/10.14190/JRCR.2022.10.3.185

Development of Mineral Admixture for Concrete Using Spent Coffee Grounds  

Kim, Sung-Bae (J1 Industries)
Lee, Jae-Won (J1 Industries)
Choi, Yoon-Suk (Construction Technology Research Center, Korea Conformity Laboratories)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.10, no.3, 2022 , pp. 185-194 More about this Journal
Abstract
Coffee is one of the most consumed beverages in the world and is the second largest traded commodity after petroleum. Due to the great demand of this product, large amounts of waste is generated in the coffee industry, which are toxic and represent serious environmental problems. This study aims to study the possibility of recycling spent coffee grounds (SCG) as a mineral admixture by replacing the cement in the manufacturing of concrete. To recycle the coffee g rounds, the SCG was dried to remove moisture and fired in a kiln at 850 ℃ for 8 hours. Carbonized coffee grounds are produced as coffee grounds ash (CGA) through ball mill grinding. The chemical composition of the prepared coffee grounds ash was investigated using X-ray fluorescence (XFR). According to the chemical composition analysis, the major elements of coffee grounds ash are K2O(51.74 %), CaO(15.92 %), P2O5(14.39 %), MgO(7.74 %) and SO3(6.89 %), with small amounts of F2O3(0.66 %), SiO2(0.59 %) and Al2O3(0.31 %) content. To evaluate quality and mechanical properties, substitutions of 5, 10, and 15 wt.% of coffee grounds ash (CGA) were tested. From the quality test results, the 28-day activity index of CGA5 reached 80 %, and the flow value ratio reached 96 %, which is comparable to the minimum requirement for second-grade FA. From the test results of the mortar, the optimal results have been found in specimens with 5 wt-% coffee grounds ash, showing good mechanical and physical properties.
Keywords
Recycling; Spent coffee grounds; Admixture; Coffee grounds ash; Chemical composition;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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