Substitution of aggregates by waste foundry sand: effects on physical properties of mortars




Waste treatment, Pozzolan, Aggregate, Mortar, Compressive strength


The substitution of the normalized aggregate by residual foundry sand (WFS) was studied on the physical properties of mortars by means of resistance to compression and capillary absorption tests. The aggregate was replaced by WFS in its natural state (WFS), washed residual foundry sand (WFSW) and heat treated residual foundry sand (WFST). The WFS had a percentage of bentonite, which was sought to be thermally activated. It was found that the physical behavior of the mortars containing WFS and WFSW was similar to that of the control sample. The clay recovered from the sand washing was evaluated for its pozzolanic potential, it was found that, with the thermal treatment, the montmorillonite acquires pozzolanic behavior. Mortars with WFST presented a drop in compressive strength. The pozzolanic effect achieved in the clay was not reflected in the compressive strength of the mortars with WFST.


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How to Cite

Feijoo, B. ., Tobón, J. ., & Restrepo-Baena, O. . (2021). Substitution of aggregates by waste foundry sand: effects on physical properties of mortars. Materiales De Construcción, 71(343), e251.



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