Experimental Investigation of the Effect of Slag and Fly Ash Pozzolanic Materials as Cement Replacements on the Compressive Strength of Concrete
الموضوعات :shahab fallah 1 , amin zamanian 2 , ahmadreza mokhtari 3 , peyman shadman heidari 4
1 - Department of Civil Engineering, ET.C, Islamic Azad University, Tehran, Iran
2 - Department of Civil Engineering, ET.C, Islamic Azad University, Tehran, Iran
3 - Department of Civil Engineering, ET.C, Islamic Azad University, Tehran, Iran
4 - Department of Civil Engineering, ET.C, Islamic Azad University, Tehran, Iran
الکلمات المفتاحية: Sustainable concrete, Fly ash, Slag, Compressive strength, Cement replacement,
ملخص المقالة :
Portland cement is one of the main materials used in the construction industry and is responsible for a significant share of global greenhouse gas emissions. Therefore, using pozzolanic materials and industrial by-products such as fly ash and blast furnace slag as partial replacements for cement is considered an effective approach toward reducing environmental impacts and promoting sustainable concrete. In this study, the compressive strength of concrete was investigated by partially replacing cement with fly ash at 10%, 20%, and 30%, and with slag at 20%, 30%, and 50%. A control mix without any pozzolanic additives was also prepared for comparison. Cube specimens were cast according to ASTM C109 and cured under laboratory conditions for 180 days. After the curing period, compressive strength tests were conducted on all samples. The results showed that incorporating fly ash and slag can improve the long-term compressive strength of concrete, although the extent of improvement depends on the replacement percentage and type of material used. According to researches done, replacing 20% of the cement with fly ash and 20% with slag resulted in the highest increase in compressive strength at 180 days compared to the control mix. The comparison indicates that these optimal replacement levels contributed effectively to pozzolanic reactions and the development of a denser microstructure over time.
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