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Submitted
23 July 2026
Accepted
4 August 2026
Published
18 September 2026
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Abstract

Tingginya emisi CO₂ dari industri semen mendorong pemanfaatan limbah konstruksi, seperti gypsum, sebagai substitusi parsial semen. Meskipun gypsum dapat bertindak sebagai filler, kelebihan sulfat dapat memicu ekspansi ettringite sekunder yang merusak beton. Penelitian eksperimental deskriptif-kuantitatif ini mengkaji pengaruh substitusi serbuk limbah gypsum (3%, 5%, dan 7%) terhadap workability, kuat tekan, kuat tarik belah, dan mikrostruktur beton (fc' 20 MPa). Pengujian meliputi uji slump, kuat tekan dan tarik belah (umur 7, 14, 28 hari), XRF, serta SEM. Hasil menunjukkan workability stabil pada slump 7,00–7,33 cm. Namun, substitusi memicu penurunan progresif pada kuat tekan umur 28 hari: dari 23,14 MPa (0%), 20,31 MPa (3%), 17,14 MPa (5%), hingga 13,36 MPa (7%). Kuat tarik belah juga menurun dari 2,31 MPa menjadi 1,58 MPa. Analisis SEM mengonfirmasi degradasi matriks dan pertumbuhan masif ettringite sekunder pada kadar 5–7%. Secara ekonomi, penghematan biaya dari variasi 7% sangat marginal (Rp17.342,00/m³ atau <1% dari biaya beton normal). Kesimpulannya, substitusi limbah gypsum masih layak dipertimbangkan pada kadar di bawah 5%, sedangkan kadar 7% memicu degradasi struktural signifikan sehingga tidak direkomendasikan untuk elemen beton struktural.

Keywords

limbah gypsum substitusi semen kuat tekan beton Scanning Electron Microscope (SEM) konstruksi berkelanjutan

Article Details

References

  1. A. M. Neville and J. J. Brooks, Concrete Technology, 2nd ed. Harlow, UK: Pearson Education Limited, 2010.
  2. IEA, Cement. Paris, France: International Energy Agency, 2022.
  3. G. Habert et al., "Environmental Impacts and Decarbonization Strategies in the Cement and Concrete Industries," Nature Reviews Earth & Environment, vol. 1, no. 11, pp. 559-573, 2020.
  4. K. L. Scrivener, V. M. John, and E. M. Gartner, "Eco-efficient Cements: Potential, Economically Viable Solutions for a Low-CO₂ Cement-based Materials Industry," Cement and Concrete Research, vol. 114, pp. 2-26, 2018.
  5. M. Singh and M. Garg, "Use of Waste Plasterboard Powder as Partial Cement Replacement in Concrete," Journal of Building Engineering, vol. 44, p. 103411, 2021.
  6. S. H. Kang et al., "Utilization of Recycled Gypsum from Waste Plasterboard in Cement-based Materials," Journal of Cleaner Production, vol. 276, p. 123217, 2020.
  7. J. J. Thomas, H. M. Jennings, and J. J. Chen, "Influence of Calcium Sulfate on Cement Hydration and Microstructure Development," Cement and Concrete Research, vol. 95, pp. 145-155, 2017.
  8. Y. Li et al., "Utilization of Waste Gypsum in Cement-based Materials: A Review," Construction and Building Materials, vol. 253, p. 119865, 2020.
  9. T. Zhang et al., "Effect of Gypsum on Hydration and Mechanical Properties of Cementitious Materials," Journal of Materials Research and Technology, vol. 15, pp. 4120-4132, 2021.
  10. A. P. Basir, A. Sulfanita, and A. Muis, "Pengaruh Limbah Gypsum Sebagai Substitusi Semen Terhadap Kuat Tekan Beton," Jurnal Konstruksi, vol. 5, no. 2, pp. 651-660, 2025.
  11. A. M. Maglad et al., "Synergistic Effect of Waste Gypsum Plasterboard and Fly Ash as Partial Cement Replacement on Foamed Concrete," Construction and Building Materials, vol. 463, p. 140079, 2025.
  12. J. Bensted and P. Barnes, Structure and Performance of Cements, 3rd ed. London, UK: CRC Press, 2021.
  13. P. Hewlett and M. Liska, Lea's Chemistry of Cement and Concrete, 5th ed. Oxford, UK: Elsevier, 2019.
  14. E. S. S. Nascimento et al., "Sustainable Use of Gypsum Waste for Applications in Soil-cement Bricks," Ceramics, vol. 8, no. 3, p. 83, 2025.
  15. P. K. Mehta and P. J. M. Monteiro, Concrete: Microstructure, Properties, and Materials, 4th ed. New York, NY, USA: McGraw-Hill Education, 2014.