Utilization of Used Foundry Sand in Cementitious Materials for Structural Applications

Memoria tratta da "The New Boundaries of Structural Concrete: Session A – Performance and Life-Cycle Costs of New Concrete Structures", ACI IC - Ancona 2011

The possibility of reusing two different types of Used Foundry Sand (UFS), coming from two different process stages of the same foundry in Italy, in mortars for structural applications, was investigated. The UFSs were characterized for physical and chemical properties. They were added to mortars as fine aggregate replacement at increasing dosages (ranging from 0% to 30%). Different water to cement ratios (ranging from 0.45 to 0.55), as well as the addition of previously washed UFS, was used in the mortar mixtures. The resulting water after washing the UFS was used to manufacture cement pastes in order to investigate the effect of soluble UFS ions on the hydration kinetics of the cement. The results obtained show that UFS properties, as well as the content of very fine powder in the UFS and the chemical composition, are very dependent on their source. It was concluded that mortars for structural applications can be manufactured with UFS as a partial replacement of natural sand. It is believed that the use in construction of UFS is beneficial over throwing it away in a landfill.

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