Mix Design Formulation and Stress-Strain Relationship of Fly Ash-Based Workable Geopolymer Concrete: an Experimental Study

Purwanto Purwanto; Bobby Rio Indriyantho; Nuroji Nuroji; Januarti J. Ekaputri; Rydell Riko; Buntara Sthenly Gan; Han Ay Lie

doi:10.15866/irece.v13i4.21515

Mix Design Formulation and Stress-Strain Relationship of Fly Ash-Based Workable Geopolymer Concrete: an Experimental Study

Purwanto Purwanto^(1*), Bobby Rio Indriyantho⁽²⁾, Nuroji Nuroji⁽³⁾, Januarti J. Ekaputri⁽⁴⁾, Rydell Riko⁽⁵⁾, Buntara Sthenly Gan⁽⁶⁾, Han Ay Lie⁽⁷⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/irece.v13i4.21515

Abstract

Geopolymer concrete is known as a concrete made by one of cementitious materials in order to reduce carbon dioxide (CO2) emissions for sustainable development purposes. Instead of using Portland cement for a mortar matrix, mineral residues as a result of power plant processes so-called fly ash are used to replace completely the existence of cement in a concrete structure. A large amount of chemical compounds such as silicon dioxide or silica (SiO2), aluminum oxide (Al2O3) and iron(III) oxide or ferric oxide (Fe2O3) contained in fly ash can substitute Portland cement as a chemical binder in concrete materials. Fly ash Class F which contains more than 70% of SiO2, Al2O3 and Fe2O3 in total with less than 10% of calcium oxide (CaO) has been investigated yielding compressive strengths similar to or even higher than the conventional concrete using Portland cement. In order to obtain a strong chemical binder between aggregates and fly ash, an activator containing a mixture of sodium hydroxide (NaOH) and sodium metasilicate (Na2SiO3) is applied here, where two types of Na2SiO3 (Be52 and Be58) are employed. Further, workability is investigated by comparing Na2SiO3 type Be52 and Na2SiO3 type Be58, with maintaining an acceptable compressive strength. Then the results of proportional mix design variations for geopolymer concrete are analyzed in terms of the modulus of elasticity and the Poisson’s ratio as well as its stress-strain relationship compared to the conventional concrete.
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Keywords

Fly Ash-Based Geopolymer Concrete; Mix Design; Workability; Compressive Strength; Stress-Strain Relationship

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