The Effect of the Utilization of Sustainable Materials on Some Mechanical Properties of Geopolymer Mortar

Authors

  • Sally Hashim Mohammed Department of Civil Engineering, University of Baghdad, Iraq
  • Nada Mahdi Fawzi Department of Civil Engineering, University of Baghdad, Iraq
Volume: 14 | Issue: 1 | Pages: 12464-12469 | February 2024 | https://doi.org/10.48084/etasr.6378

Abstract

Geopolymer concrete has been developed as a means of reducing carbon dioxide (CO₂) emissions due to concrete manufacturing, which account for around 5–10% of the total global CO₂ emissions. Additionally, this innovative material aims to utilize industrial waste as a sustainable resource. This study concentrates on developing a geopolymer mortar composition comprising 70% fly ash and 30% metakaolin. The mixture also includes 14 molars of sodium hydroxide, sodium silicate, saturated surface dry sand, water at a volume of 10% of the mix, and 1.5% superplasticizer. The solution-to-solid materials ratio was established at 0.55 while the ratio between sodium silicate and sodium hydroxide was established at 2.5:1. The geopolymer mortar was enhanced by rice husk fibers at varying volume percentages of 1%, 1.5%, and 2%. Additionally, waste paper, in the form of paper ash, was introduced as filler at a volume percentage of 5%. Following the demolding process, the specimens were cured in the controlled environment of an oven, with the temperature set at 60 °C for a period of 24 hr. Subsequently, the cured samples were stored for 7 and 28 days and then were tested. When different amounts of rice husk fibers were mixed in with a fixed amount of 5% paper ash, the flexural resistance of the geopolymer mortar increased significantly. After 7 days of curing, it was seen that the flexural strength experienced an increase of 4%, 13%, and 25%, and a further increase of 11%, 18%, and 31% after 28 days of curing. The results of the impact test showed a notable enhancement in impact resistance and energy absorption when incorporating paper ash and rice husk fibers. Specifically, the initial crack results exhibited a 50% rise, while the specimen failure after 28 days of curing showed a 66% improvement.

Keywords:

geopolymer mortar, fly ash, metakaolin, rice husk fibers, waste paper ash, impact test, flexural strength

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How to Cite

[1]
S. H. Mohammed and N. M. Fawzi, “The Effect of the Utilization of Sustainable Materials on Some Mechanical Properties of Geopolymer Mortar”, Eng. Technol. Appl. Sci. Res., vol. 14, no. 1, pp. 12464–12469, Feb. 2024.

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