石灰-高炉矿渣改良膨胀土强度特性试验研究

Experimental study on strength characteristics of expanded soil improved by lime-blast furnace slag

因膨胀土具有吸水膨胀、失水收缩等不稳定性特征,使用高炉矿渣作为新型固化剂,并与无机材料石灰组合对膨胀土进行改良。对改良膨胀土开展自由膨胀率、液塑限、无侧限抗压强度和抗剪强度等指标的研究,探讨并分析了石灰-高炉矿渣(L-BLS)改良膨胀土在不同养护龄期以及不同改良剂掺量下的无侧限抗压强度变化规律。结果表明:使用L-BLS改良膨胀土能够显著提高膨胀土的早期强度;改良膨胀土的强度随养护龄期及改良剂掺量的增加而增强;当掺入6%石灰及9%高炉矿渣时,对应龄期的无侧限抗压强度最大,材料的有效利用率最佳。

Due to the unstable characteristics of expansive soil,such as water absorption and expansion,as well as shrinkage upon water loss,a new type of solidifying agent,blast furnace slag,was used to improve the expansive soil in combination with inorganic material lime.The research focused on the free expansion rate,liquid plastic limit,unconfined compressive strength,and shear strength of the improved expansive soil.The study also explored and analyzed the variation of unconfined compressive strength of lime-blast furnace slag(L-BLS)improved expansive soil at different curing ages and different dosages of the improvement agent.The results showed that the use of L-BLS to improve the expansive soil significantly increased its early strength.The strength of the improved expansive soil increased with the increase of curing age and dosage of the improvement agent.When 6%lime and 9%blast furnace slag were added,the unconfined compressive strength at the corresponding curing age was the highest,and the effective utilization rate of the material was optimal.