工业废料固化浅层淤泥质土研究

Solidifying Shallow Sludge Soil Using Industrial Waste

我国滨海地区广泛分布淤泥质土,对其开展固化研究具有重要意义。以工业废料为固化材料,开展了针对浅层淤泥质土的固化剂研究。首先根据各种工业废料的自身性质,选出粉煤灰、磷石膏、电石渣共3种常见的工业废料作为固化剂的主要成分;然后,再通过混料试验,分别得到3,7,28 d的无侧限抗压强度回归方程,并计算得到各龄期所对应的最优配比。最后得出固化剂各组分质量的最佳配比为粉煤灰∶磷石膏∶电石渣=21.6∶26.8∶51.6,该配比在水化物反应过程中的协调性良好,并将该配比下的固化剂命名为JX18。试验结果表明:经JX18固化处理后的淤泥质土在7 d后无侧限抗压强度达到413.6 kPa,满足大型机械上机施工要求。研究成果可为滨海地区淤泥质土的地基处理提供一定的理论指导。

Sludge soil is widely distributed in coastal areas of China.Studying the solidification of coastal sludge soil is of great significance.Research on industrial waste as the stabilizer for coastal sludge soil of shallow layer was carried out.In view of the properties of various industrial wastes,three common industrial wastes,namely,fly ash,phosphogypsum,and carbide slag,were selected as the main components of the soil stabilizer.Through mixture design experiment,the regression equations of unconfined compressive strength at age of 3 days,7 days,and 28 days were obtained,and the optimum ratios corresponding to each age were calculated.The optimum ratio of each component of the soil stabilizer is:flyash∶phosphogypsum∶carbide slag=21.6∶26.8∶51.6.The hydration reaction process is well coordinated under the optimum ratio.The soil stabilizer under the optimum ratio was named JX18.Test results showed that the unconfined compressive strength of the sludge soil solidified by JX18 reached 413.6 kPa after 7 days,which meets the requirements of large-scale mechanical construction.The research results provide theoretical guidance for the foundation treatment of sludge soil in coastal areas.