Flexural strength characteristics of high performance geopolymer concrete using ceramic waste aggregates and silica fume. (2022)

• Record Type: Journal Article
• Authors: Kavipriya, S.; Dhavashankaran, D.; Ramkumar, S.; Lingeshwaran, N.; Deepanraj, C.G.
• Is Part Of: Materials today. Volume 62:Part 12(2022)
• Page Start: 6879
• Page End: 6883
• Publication Date: 2022
• Subjects: Alkaline activator -- Ceramic waste -- Curing -- Geopolymer concrete -- Sodium hydroxide -- Sodium silicate -- Superplasticizer -- Polymerization; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2022.05.170
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Nowadays utilization of ceramic products in construction industries becomes wider. At the same time Construction Demolition Waste (CDW) also increasing day by day. The main objective of this study is to reduce the dumping of construction and demolition waste and utilize those materials into useful source in concrete. Usage of silica fumes also increasing in a faster rate in past few decades. This paper mainly focuses on replacement of ceramic waste aggregates in different proportions as 10%, 20%, 30%, 40%, 50% with normal coarse aggregates. Since zero percent cement is used in geopolymer concrete with fly ash as main source material. Constantly 15% of silica fume is replaced with fly ash to increase the performance of concrete in all specimens. M−Sand is used as fine aggregate. Alkaline activator solution which is a combination of sodium hydroxide and sodium silicate solution is used as water source to improve the polymerization process of source material in concrete. Ratio of source material to activator liquid is considered as 0.8 ratio of sodium hydroxide to sodium silicate is taken as 2:5. And 12 M sodium hydroxide is used. Specimens are subjected to oven curing at 90 °C for 48 h. Three days are left as rest period. Polycarboxylate based superplasticizer (Conplast SP430-0.8% by weight of fly ash) is used to blend the concrete into a homogeneous mix with good workability. Beams are cast and tested to analyze its various flexural characteristics of high performance geopolymer concrete. It was found that replacement of ceramic waste aggregates with coarse aggregates up to 30% produce good results compared to control concrete. Replacement of 40% and 50% of ceramic waste aggregates with coarse aggregates reduce the performance of concrete in all aspects.