Abstract
Currently, the use of wastes and by-products as cementitious additions has become a necessity in the cement production sector. Because of their technical benefits and low cost. However, because of the pollutant load of these materials, it is essential to study the environmental behavior and the leachability of these cement mixtures before their use into buildings.This paper investigates the leachability of cement-based mortars containing various percentages of the waste material obtained from the incineration of sewage sludge, i.e. sewage sludge ash (SSA). The SSA and SSA- mortars was characterized by classical, analytical and instrumental measurement. In addition, the leaching behavior of heavy metals in SSA and SSA- mortars were assessed using NF EN12457-2 and NF PX31-211 leaching tests. Results illustrate that the leaching behavior of SSA shows an important release of Cr, Mo, Ba, Sr, V, Zn and Al. While, the leaching behavior of mortars containing different amounts of SSA showed that heavy metals were successfully immobilized in cement matrix.
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