International Journal For Multidisciplinary Research

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Volume 8 Issue 5
September-October 2026

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Experimental Investigation on the Strength Characteristics of Alkali-Activated Slag

Author(s) Mr. Gunupuru Durga Rama Naidu, Mr. Dumpala Sesi Kumar, Mrs. Divyasri Velamala
Country India
Abstract The construction sector is increasingly adopting alternative cementitious materials to reduce the environmental impact associated with Portland cement production. Alkali-activated slag concrete (AASC) is a promising low-carbon material in which industrial by-products are chemically activated to develop a cementitious binder. In the present study, the strength behaviour of alkali-activated slag concrete was investigated with emphasis on compressive strength, split tensile strength, and beam load–deflection response. Ground granulated blast furnace slag (GGBS), silica fume, and gypsum were used in the binder system, while sodium hydroxide (NaOH) and sodium silicate (Na₂SiO₃) were used as alkaline activators. Concrete mixes corresponding to 18 M and 19 M activator concentrations were investigated, and the 19 M mix was selected as the optimum mix based on the reported test results. Specimens were evaluated at 3, 7, and 28 days. The average 28-day compressive strength of the selected alkali-activated mix was 39.64 N/mm², compared with 30.66 N/mm² for conventional concrete. The corresponding average split tensile strengths were 2.85 and 2.17 N/mm², respectively. Beam testing at 28 days also indicated a higher load-carrying capacity and lower deflection for the alkali-activated beam within the reported test range. The results demonstrate the potential of GGBS-based alkali-activated concrete as a sustainable alternative to conventional concrete.
Keywords Alkali-Activated Slag Concrete, Ground Granulated Blast Furnace Slag, Silica Fume, Gypsum, Sodium Hydroxide, Sodium Silicate, Compressive Strength, Split Tensile Strength
Field Engineering
Published In Volume 8, Issue 5, September-October 2026
Published On 2026-09-04
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E-ISSN 2582-2160
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CrossRef DOI prefix of IJFMR is 10.36948/ijfmr

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