Use of waste paper ash or wood ash as substitution to fly ash in production of geopolymer concrete

Main Article Content

Haider M. Owaid
Muna M. Al-Rubaye
Haider M. Al-Baghdadi


Keywords : geopolymer concrete, GC, fly ash, FA, waste paper ash, WPA, wood ash, WA, alkaline solution
Abstract
Large quantities of paper and wood waste are generated every day, the disposal of these waste products is a problem because it requires huge space for their disposal. The possibility of using these wastes can mitigate the environmental problems related to them. This study presents an investigation on the feasibility of inclusion of waste paper ash (WPA) or wood ash (WA) as replacement materials for fly ash (FA) class F in preparation geopolymer concrete (GC). The developed geopolymer concretes for this study were prepared at replacement ratios of FA by WPA or WA of 25, 50, 75 and 100% in addition to a control mix containing 100% of FA. Sodium hydroxide (NaOH) solutions and sodium silicate (Na2SiO3) are used as alkaline activators with 1M and 10M of sodium hydroxide solution.The geopolymer concretes have been evaluated with respect to the workability, the compressive strength, splitting tensile strength and flexural strength. The results indicated that there were no significant differences in the workability of the control GC mix and the developed GC mixes incorporating WPA or WA. Also, the results showed that, by incorporating of 25–50% PWA or 25% WA, the mechanical properties (compressive strength, splitting tensile strength and flexural strength) of GC mixes slightly decreased. While replacement with 75–100% WPA or with 50–100% WA has reduced these mechanical properties of GC mixes. As a result, there is a feasibility of partial replacement of FA by up to 50% WPA or 25% WA in preparation of the geopolymer concrete.

Article Details

How to Cite
Owaid, H. M., Al-Rubaye, M. M., & Al-Baghdadi, H. M. (2021). Use of waste paper ash or wood ash as substitution to fly ash in production of geopolymer concrete. Scientific Review Engineering and Environmental Sciences (SREES), 30(3), 464–476. https://doi.org/10.22630/PNIKS.2021.30.3.39
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