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Computers and Concrete Volume 33, Number 6, June 2024 , pages 707-724 DOI: https://doi.org/10.12989/cac.2024.33.6.707 |
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Optimizing cement replacement with rice husk ash and eggshell ash for enhanced mechanical properties of geopolymer concrete: A comparative study with and without admixture |
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Yashwanth Pamu, Venkata Sarath Pamu, Praveen Samarthi and Mahesh Kona
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| Abstract | ||
| This paper proposes a study of cement replacement with rice husk ash (RHA) and eggshell ash (ESA) for enhanced mechanical properties of geopolymer (GP) concrete with and without admixture. The main objective is to investigate the mechanical properties of GP with various replacement levels of Pozzolana Portland cement by RHA and ESA. The GP resistance to durability is examined and impact of ash materials on concrete's durability performance is determined. The environmental benefits of using agricultural waste materials in GP manufacturing minimize cement usage and CO2 emissions. The goal is to assess value of RHA-ESA of building material, paving stones for structures to lessen environmental impact. The novelty lies in use of ESA and RHA as partial replacements for cement and investigation of admixtures to enhance concrete properties, and reduce environmental impact. The research contributes by introducing a novel approach to reducing cement consumption by using ESA and RHA to address environmental concerns. It also explores the potential benefits of admixtures improving concrete performance and reducing environmental pollution. A study is carried with and without impacts of admixture to find compressive strength of GP cubes. The cement has been replaced by RHA and ESA in the range of (2.5%+7.5%, 5%+5%, 7.5%+2.5) by weight of cement for M20 mix. The compressive strength (CS) and split tensile strength (STS) at 7days, 14 days and 28 days is obtained as 21 N/mm2 at 7.5%RHA+2.5%ESA and 2.3 at 7.5%RHA+2.5%ESA, 24 N/mm2 at 7.5%RHA+2.5%ESA and 2.3 at 7.5%RHA+2.5%ESA, 28 N/mm2 at 7.5%RHA+2.5%ESA and 2.8 at 7.5%ESA respectively with normal curing condition. | ||
| Key Words | ||
| compressive strength; eggshell ash (ESA); fineness of cement; initial setting time; M20 grade concrete; replacement ratio selection; rice husk ash (RHA); split tensile strength; water absorption | ||
| Address | ||
| Yashwanth Pamu, Praveen Samarthi and Mahesh Kona: Department of Civil Engineering, CVR College of Engineering, Hyderabad, Telangana, India Venkata Sarath Pamu: Department of Food and Agricultural Products Centre, Oklahoma State University, Stillwater, United States | ||