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Study of using Coal Fly Ash (CFA) and Rice Husk Ash (RHA) on the Compressive Strength of Geopolymer Concrete
Journal article   Open access   Peer reviewed

Study of using Coal Fly Ash (CFA) and Rice Husk Ash (RHA) on the Compressive Strength of Geopolymer Concrete

Andiensa Hana Insyira, Yureana Wijayanti, Oki Setyandito, Dian Pratama Putra, Nugroho Adi Soekotjo, Ernie Sasongko and Martin Anda
E3S web of conferences, Vol.426, 01011
2023
DOI: https://doi.org/10.1051/e3sconf/202342601011
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Published2.96 MBDownloadView
CC BY V4.0,  Open Access

Abstract

Concrete is a material that is widely used in the construction world. The production of Portland cement in concrete leads to CO 2 emissions that have an impact on global warming. Geopolymer Concrete is an eco-friendly material because it does not use Portland cement. Geopolymer cement is made from waste materials such as fly ash (FA) by alkali activation. In geopolymer, sodium silicate is a commonly used activator that is produced commercially. In this study, rice husk ash (RHA) from agricultural waste was used as an activator for geopolymer cement. The objective of this study is to review the chemical component of FCA and RHA and, to examine the effect of RHA in geopolymer concrete mixed design on the compressive strength. The geopolymer concrete binder is using 12 M NaOH and Na 2 SiO 3 , with variations for RHA 0%, 5%, 7.5%, and 10%. The specimens were treated for 28 days, curing in a 70oC oven for 24 hours then curing at ambient temperature. The result shows that geopolymer concrete has a higher compressive strength compared to ordinary Portland cement (OPC) as much as a 5.9 MPa difference with geopolymer concrete of RHA10% of 25 MPa.

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