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Investigation of engineering properties of normal and high strength fly ash based geopolymer and alkali-activated slag concrete compared to ordinary Portland cement concrete

Journal Article


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Abstract


  • Fly ash-based geopolymer (FAGP) and alkali-activated slag (AAS) concrete are produced by mixing alkaline

    solutions with aluminosilicate materials. As the FAGP and AAS concrete are free of Portland cement,

    they have a low carbon footprint and consume low energy during the production process. This paper

    compares the engineering properties of normal strength and high strength FAGP and AAS concrete with

    OPC concrete. The engineering properties considered in this study included workability, dry density,

    ultrasonic pulse velocity (UPV), compressive strength, indirect tensile strength, flexural strength, direct

    tensile strength, and stress-strain behaviour in compression and direct tension. Microstructural observations

    using scanning electronic microscopy (SEM) are also presented. It was found that the dry density

    and UPV of FAGP and AAS concrete were lower than those of OPC concrete of similar compressive

    strength. The tensile strength of FAGP and AAS concrete was comparable to the tensile strength of OPC

    concrete when the compressive strength of the concrete was about 35 MPa (normal strength concrete).

    However, the tensile strength of FAGP and AAS concrete was higher than the tensile strength of OPC concrete

    when the compressive strength of concrete was about 65 MPa (high strength concrete). The modulus

    of elasticity of FAGP and AAS concrete in compression and direct tension was lower than the

    modulus of elasticity of OPC concrete of similar compressive strength. The SEM results indicated that

    the microstructures of FAGP and AAS concrete were more compact and homogeneous than the

    microstructures of OPC concrete at 7 days, but less compact and homogeneous than the microstructures

    of OPC concrete at 28 days for the concrete of similar compressive strength.

Publication Date


  • 2019

Citation


  • Farhan, N., Sheikh, M. Neaz. & Hadi, M. N. S. (2019). Investigation of engineering properties of normal and high strength fly ash based geopolymer and alkali-activated slag concrete compared to ordinary Portland cement concrete. Construction and Building Materials, 196 26-42.

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3073&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2068

Number Of Pages


  • 16

Start Page


  • 26

End Page


  • 42

Volume


  • 196

Place Of Publication


  • Netherlands

Abstract


  • Fly ash-based geopolymer (FAGP) and alkali-activated slag (AAS) concrete are produced by mixing alkaline

    solutions with aluminosilicate materials. As the FAGP and AAS concrete are free of Portland cement,

    they have a low carbon footprint and consume low energy during the production process. This paper

    compares the engineering properties of normal strength and high strength FAGP and AAS concrete with

    OPC concrete. The engineering properties considered in this study included workability, dry density,

    ultrasonic pulse velocity (UPV), compressive strength, indirect tensile strength, flexural strength, direct

    tensile strength, and stress-strain behaviour in compression and direct tension. Microstructural observations

    using scanning electronic microscopy (SEM) are also presented. It was found that the dry density

    and UPV of FAGP and AAS concrete were lower than those of OPC concrete of similar compressive

    strength. The tensile strength of FAGP and AAS concrete was comparable to the tensile strength of OPC

    concrete when the compressive strength of the concrete was about 35 MPa (normal strength concrete).

    However, the tensile strength of FAGP and AAS concrete was higher than the tensile strength of OPC concrete

    when the compressive strength of concrete was about 65 MPa (high strength concrete). The modulus

    of elasticity of FAGP and AAS concrete in compression and direct tension was lower than the

    modulus of elasticity of OPC concrete of similar compressive strength. The SEM results indicated that

    the microstructures of FAGP and AAS concrete were more compact and homogeneous than the

    microstructures of OPC concrete at 7 days, but less compact and homogeneous than the microstructures

    of OPC concrete at 28 days for the concrete of similar compressive strength.

Publication Date


  • 2019

Citation


  • Farhan, N., Sheikh, M. Neaz. & Hadi, M. N. S. (2019). Investigation of engineering properties of normal and high strength fly ash based geopolymer and alkali-activated slag concrete compared to ordinary Portland cement concrete. Construction and Building Materials, 196 26-42.

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3073&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2068

Number Of Pages


  • 16

Start Page


  • 26

End Page


  • 42

Volume


  • 196

Place Of Publication


  • Netherlands