Abstract
The growing demands for cement have proportionally affect the environment such as ecosystem alterations and pollutions. Therefore, this study was conducted to investigate the potential of chicken eggshell as an alternative fine aggregate in concrete mixture due to its similar high calcium carbonate (CaCO3) content with limestone. The experimental program was developed by substituting the sands (by volume) in the conventional concrete formulation with 10%, 20%, 30% and 40% of chicken eggshell powder (CEP). The eggshells were calcinated at 900 °C to produce calcium oxide (CaO) or quicklime. The samples were undergoing wet curing for the period of 28 days. Primary concrete characteristics such as pH, carbonation depth, compressive strength and sorptivity were studied. From the results, the additions of calcium oxide in the aggregates are strongly pronounced in carbonation rate (up to 42%) and compression strength (up to 58.4%). It is believed that the mechanical component of the bond has been improved with the additional calcium oxide. There are no significant differences of pH and sorptivity values between CEP and conventional concretes. The highest replacement percentage of 40% is beneficial for acceleration rate of carbonation and compressive strength. However, formulation modification is not required if the specifier is looking for pH and sorptivity performances enhancement.
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