Carbide lime is a by-product obtained during the manufacturing of acetylene from the reaction of calcium carbide and water. A major portion of carbide lime is dumped in waste deposition areas, creating an environmental problem. Carbide lime and fly ash have possible applications in slope stabilization, subgrade improvement of roads, and soil treatments under shallow foundations. A series of Atterberg limits tests, compaction tests, unconfined compressive strength tests, ultrasonic pulse velocity tests, and wetting–drying tests were performed on carbide lime and fly ash treated clay soils to evaluate the effects of additive content, curing time, strength development, and the effects of wetting and drying. A total of 8% of carbide lime constituted the fixation point, and peak strength was achieved at 12% carbide lime content. A total amount of 25% additive was found as a threshold changing the Atterberg limits. Test results indicated that the strength of the treated soil improved by the existence of carbide lime and fly ash; best performance was observed in 28-day specimens with 10% carbide lime and 20% fly ash content reaching to 8 times larger strength than untreated soil. The failure patterns of the specimens reflected the curing time and wetting–drying effects. Although, the application of wetting–drying cycles deteriorated the treated soil, the presence of carbide lime partially prevented the strength loss. New relationships between normalized strength and curing time depending on carbide lime content were proposed. Furthermore, a linear relationship between the unconfined compressive strength and the ultrasonic pulse velocity of the treated soils was established.

碳化物石灰是电石与水反应生产乙炔过程中获得的副产品。大部分电石石灰倾倒在废物沉积区，造成环境问题。硬质合金石灰和粉煤灰可用于边坡稳定、道路路基改善和浅地基土壤处理。对电石石灰和粉煤灰处理过的粘土进行了一系列 Atterberg 极限试验、压实试验、无侧限抗压强度试验、超声波脉冲速度试验和干湿试验，以评估添加剂含量、固化时间、强度发展、以及润湿和干燥的影响。总共 8% 的电石石灰构成了固定点，在 12% 的电石石灰含量下达到了峰值强度。发现添加剂总量为 25% 作为改变 Atterberg 限值的阈值。试验结果表明，电石石灰和粉煤灰的存在提高了处理土的强度；在 10% 电石石灰和 20% 飞灰含量的 28 天试样中观察到最佳性能，其强度比未经处理的土壤高 8 倍。试样的破坏模式反映了固化时间和干湿效应。尽管干湿循环的应用使处理过的土壤变质，但电石石灰的存在部分防止了强度损失。提出了取决于电石石灰含量的正火强度和固化时间之间的新关系。此外，建立了无侧限抗压强度与处理过的土壤的超声脉冲速度之间的线性关系。