Effect of Fly ash and Slag on the Performance of Light Expanded Clay Aggregates Concrete
DOI:
https://doi.org/10.62638/ZasMat1697Abstract
Although structural light expanded clay aggregate concrete (LECA concrete) has properties of low weight, there is a problem that appears when achieving the strength requirements due to the weak strength of LECA aggregate. To compensate for the weak strength of LECA aggregate, the amount of cement could increase, which leads to an increase in emissions of carbon dioxide by increasing the cement consumption. On the other hand, the high absorption of LECA aggregate due to high porosity may threaten the durability of this type of concrete. Therefore, the importance of this research lies in addressing these problems by changing the properties of the matrix and the LECA aggregate, and the amount of cement was reduced using a group of supplementary cementitious materials SCMs, most notably fly ash and slag, which have lower carbon emissions. The type of LECA was also changed by using two forms with different densities. The practical programme included casting various specimens for evaluation of compressive strength, water absorption, chloride migration coefficient, and corrosion of reinforced LECA concrete. The results of this study indicated that compressive strength was greatly affected by changing the type of LECA, while there was no significant effect when changing the properties of the matrix. Meanwhile, fly ash and slag contributed to reducing emissions and improving the durability of LECA concrete by reducing water absorption and porosity, as well as reducing the chloride migration coefficient and reducing crack width resulting from corrosion of steel reinforcement.
Keywords:
Durability, lightweight aggregate concrete, LECA, Fly ash, slag, CO2 emission , impressed current, corrosion, chloride ingressReferences
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