Effects of cement as a substitute binder on strength and durability of fly ash–rice husk ash geopolymer concrete

Author:

Arora Saloni1,Jangra Parveen2ORCID,Pham Thong M.3ORCID

Affiliation:

1. Department of Civil Engineering, Faculty of Science and Engineering SCU Lismore Lismore New South Wales Australia

2. Department of Civil Engineering DCRUST Murthal Sonepat India

3. Department of Civil Engineering, Center for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering Curtin University Bentley Western Australia Australia

Abstract

AbstractUtilization of industrial by‐products in concrete is an effective way to reduce the exhaustion of raw materials for concrete production, but it can lead to degradation in concrete properties. Therefore, research efforts are required to achieve a balance between waste utilization and concrete performance. This study examined the strength and durability performance of geopolymer concrete (GPC) developed from fly ash (FA) and fine rice husk ash (FRHA) as main binders (50/50), with partial OPC substitution at different levels (0%–30%). Various properties like workability, compressive strength, water absorption, chloride penetration resistance, carbonation depth, electrical resistivity (ER), and acid attack resistance were experimentally investigated. Results indicated that there was a noticeable improvement in the workability with 20% OPC substitution, achieving the highest slump of 110 mm. The highest compressive strength (50 MPa) was attained with 15% OPC substitution after 90 days. Mix FR85C15 (15% OPC replacement) showed the highest durability performance at all ages through various indicators, that is, water absorption, charge passed, carbonation depth, and ER. Scanning electron microscopy and energy dispersive spectroscopy analyses also validated the enhanced microstructure of FR85C15 compared with other mixes. When exposed to sulfuric acid (H2SO4), Mix FR85C15 showed a minimal loss of 14% in compressive strength. It was concluded that GPC produced using FA and FRHA substituting OPC (up to 15%) can potentially be utilized for structural applications.

Publisher

Wiley

Subject

Mechanics of Materials,General Materials Science,Building and Construction,Civil and Structural Engineering

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