基于正交试验的高液限黏土复合改性剂研究

Study on High Liquid Limit Clay Composite Stabilizer Based on Orthogonal Test

摘要: 针对山东省黄泛区湖淤积高液限黏土，采用低纯度生石灰和固废材料脱硫石膏、制浆白泥为原材料，制备了一种复合高液限黏土改性剂——CGM改性剂。改性剂中各组分的掺量分别选取0、2%和4%，采用正交试验的方法，对各组改性土的界限含水率和无侧限抗压强度变化规律进行分析，探究各组分的最佳掺量。分析结果表明，3个因素对界限含水率的影响程度由大到小为：脱硫石膏 > 生石灰 > 制浆白泥；对无侧限抗压强度的影响程度由大到小为：生石灰 > 脱硫石膏 > 制浆白泥。综合考虑改性效果，将改性剂的配比定为生石灰：脱硫石膏：制浆白泥 = 40:40:20，CGM改性剂的最佳掺量定为10%。

Abstract: Aiming at high-liquid limit clay in Yellow River flood plain of Shandong province, a composite high liquid limit clay stabilizer—CGM stabilizer, was prepared by using quick lime, industrial solid waste materials desulfurization gypsum and pulping white mud as raw materials. The content of each component in the stabilizer was 0, 2% and 4%, respectively. To confirm the optimum dosage of each component, the variation of the limit moisture content and unconfined compressive strength of each group was analyzed by orthogonal test. The range analysis clearly indicates that the influence degree of the three factors on limit moisture content is in such an order: desulfurization gypsum, quick lime and pulping white, and on unconfined compressive strength is in another order: quick lime, desulfurization gypsum and pulping white. Considering the modification effect comprehensively, the ratio of stabilizer was set as quick lime:desulfurization gypsum:pulping white mud = 40:40:20, and the optimal content of CGM stabilizer was set as 10%.