固化高有机质水厂尾泥作为路基材料实验研究

高含水率和丰富的有机质是水厂尾泥最明显的特征。固化是处理水厂尾泥的最佳方法之一,既可改善土体的力学特性,又可降低重金属污染离子的溶出。以传统固化剂水泥石灰和工业废弃物副产石膏为主要固化材料固化水厂尾泥,提高尾泥的工程性能以期固化后的水厂尾泥可作为路基回填土使用。根据硬化体无侧限抗压强度、耐水性、抗冻融、膨胀率、浸出液检测确定其路用性能,通过X射线衍射和扫描电子显微镜来分析固化后尾泥的微观结构和水化产物。实验结果表明,4%水泥+6%石灰和16%副产石膏可以满足固化水厂尾泥作为路基填土的要求,添加强氧化剂分解有机质,可以提高固化剂的固化效果。

Experimental study on solidified high organic matter tailings of water plant as roadbed material

High water content and rich organic matter are the most obvious characteristics of water plant tailings. Solidification is one of the best methods for treating tailings of water plants. It can not only improve the mechanical properties of soil, but also reduce the dissolution of heavy metal pollution ions. The traditional solidifying agent cement lime and industrial waste by-product gypsum are used as the main solidifying materials to solidify the tailings of the water plant, and the engineering performance of the tailings is improved, so that the solidified tailings of the water plant can be used as roadbed backfill soil. According to the unconfined compressive strength, water resistance, freeze-thaw resistance, swelling ratio, and leachate of the hardened body, its road performance was determined. The microstructure and hydration products of the cured tailings were analyzed by X-ray diffraction and scanning electron microscope. The experimental results show that 4% cement + 6% lime and 16% by-product gypsum can meet the requirements of solidified water plant tailings as roadbed filling. Adding strong oxidants to decompose organic matter can improve the curing effect of the curing agent.