磷石膏综合稳定土力学性能及合理掺量研究

Study on mechanical properties and rational addition of phosphogypsum comprehensive stabilized soil

采用磷石膏与石灰、水泥综合稳定路基土,分别对石灰磷石膏稳定土与水泥磷石膏稳定土进行CBR试验、抗压回弹模量试验和7 d无侧限抗压强度试验,确定了磷石膏综合稳定路基土的推荐配合比。结果表明:石灰磷石膏稳定土和水泥磷石膏稳定土的CBR、抗压回弹模量和无侧限抗压强度均随着磷石膏掺量的增加而提高;石灰磷石膏稳定土中石灰掺量为5%~7%,且当石灰与磷石膏的质量比为1∶1.5时,水泥磷石膏稳定土中水泥掺量为4%~6%,且当水泥与磷石膏的质量比为1∶2时,混合料的力学性能和经济性最佳。

Using phosphogypsum,lime,and cement to stabilize the roadbed soil,the lime-phosphorus stabilized soil and cement phosphogypsum stabilized soil were respectively subjected to CBR test,compressive elastic modulus test,and 7 d unconfined compressive strength test to determine the recommended mix ratio of phosphogypsum comprehensive stabilized roadbed soil.The results show that the CBR,compressive elastic modulus and unconfined compressive strength of lime-phosphorus stabilized soil and cement-phosphorus stabilized soil increase with the increase of the dosage of phosphogypsum;the lime dosage in lime-phosphorus stabilized soil is 5%~7%,and when the proportion of lime-phosphorus gypsum is 1∶1.5,the cement dosage in cement-phosphorus stabilized soil is 4%~6%,and when the ratio of cement phosphogypsum is 1∶2,the mechanics of mixture performance and economy are the best.