Among the remediation possibilities of oversulfated wastes, the use of hydraulic binders appears to be a promising option. Different binders (highly clinker, moderately and highly slag binders) were used here with the objective to lower the release of sulfates from various oversulfated matrices. Stabilization tests were performed with the objective to assess binders’ efficiency with respect to their chemical composition on the one hand and to characterize the preferential geochemical pathway of stabilization on the other hand. Four sulfated matrices, two natural soils from the Paris region (a and b hereafter), a laboratory model mixture (silt/gypsum) and a crushed concrete matrix were tested in this purpose. The highly clinker binder presented the best SO₄²⁻ reduction performances on these materials, which justified a specific focus on the behavior of this binder. Physicochemical characterizations (IC, ICP-OES, XRD and TGA) suggested that the lowering of SO₄²⁻ release was achieved via the precipitation of ettringite and gypsum. These phases were here formed, presumably, via the combination of Ca²⁺ from the highly clinker binder, and Al³⁺ cations brought by the destabilization of clayey minerals. This binder was particularly effective for two matrices (Parisian soil (a) and crushed concrete) in which SO₄²⁻ lowered below both World Health Organization (WHO) and French standards. Stabilization was less conclusive on the other two matrices (Parisian soil (b) and silt/gypsum mixture) which released SO₄²⁻ above the acceptability thresholds.

在过硫酸盐废物的补救方法中，使用水硬性粘结剂似乎是一个有前途的选择。此处使用不同的粘合剂（高熟料，中度和高炉渣粘合剂），目的是减少各种过硫酸化基质中硫酸盐的释放。进行稳定化测试的目的是一方面评估粘合剂相对于其化学成分的效率，另一方面表征稳定化的优先地球化学途径。为此，对四种硫酸盐基质，两种来自巴黎地区的天然土壤（以下称为a和b），实验室模型混合物（粉砂/石膏）和压碎的混凝土基质进行了测试。高熟料粘结剂表现出最好的SO ₄ ^2-这些材料的还原性能，这证明了对该粘合剂性能的特别关注。理化特性（IC，ICP-OES，XRD和TGA）表明，通过钙矾石和石膏的沉淀可以降低SO ₄ ^2-的释放。这些相在这里大概是通过来自高度熟料粘合剂的Ca ²⁺和由粘土矿物的失稳带来的Al ³⁺阳离子的结合而形成的。该粘合剂对其中SO ₄ ^2-的两种基质（巴黎土壤（a）和压碎的混凝土）特别有效。低于世界卫生组织（WHO）和法国的标准。在其他两种基质（巴黎土壤（b）和粉砂/石膏混合物）上，稳定作用的结论性较差，它们释放的SO ₄ ^2-高于可接受的阈值。