Furnace temperature of coffee grounds as organic waste-based cementitious material in concrete

• Published in: IOP conference series. Materials Science and Engineering 2021-03, Vol.1098 (2), p.22087
• Main Authors: Anisah, A, Nugroho, M, Handoyo, S S, Musalamah, S, Maulana, A, Ramadhan, M A, Sambowo, K A, Sumarsono, R A
• Format: Article
• Language: English
• Subjects: Ashes; Cement; Chemical reactions; Coffee; Compressive strength; Concrete properties; Muffle furnaces; Potassium oxides; Silicon oxides
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/1098/2/022087

Organic waste results as a high impact as inorganic material to our environment which rise the alert to manage them seriously. Accordingly, this paper discusses the significance of organic waste-based material from the coffee powder utilized as the 5% cement replacement in concrete. Ultimately, the temperature variation of the muffle furnace to derive into coffee grounds husk ash is investigated chemically and mechanically to the compressive strength of concrete. Furnace temperature variation was set from 600°C up to 750°C for 2 hours which disclosed dominant potassium oxide. Else, some chemical components as found in cement was present except silicon oxide which predominantly appears in cement to increase concrete strength. However, the chemical reaction between coffee grounds ash, cement and other matrices in concrete mixture generated better compressive performance in accordance with the furnace temperature of 750°C climb reaching over 40 MPa which was above the targeted control sample. Even though the reactivity of the mixture was not detail observed, the coffee grounds ash obtained from 750°C furnace process was eligible as cement replacement in the concrete mixture for normal concrete design.