水泥钢渣稳定土的路用性能研究与工程应用

Study on Road Performance and Engineering Application of Cement Steel Slag Stabilized Soil

在道路材料中应用钢渣是钢渣规模化消纳的重要途径之一,水泥钢渣稳定土是一类新型路面基层材料。本文针对水泥剂量、钢渣掺量对水泥钢渣稳定土抗压强度以及劈裂强度的影响进行了研究,同时还探讨了钢渣掺量对水泥钢渣稳定土干缩性能的影响。结果表明:随着钢渣掺量的增加,水泥钢渣稳定土的无侧限抗压强度和劈裂强度逐渐提高,折压比先增加后降低,干缩系数逐渐降低;随着水泥剂量的提高,水泥钢渣稳定土的28、90 d无侧限抗压强度和劈裂强度逐渐提高,水泥剂量提高至5%(质量分数)时,折压比出现一定幅度的降低。采用配合比(质量分数)水泥外掺5%,钢渣掺量60%,土掺量40%进行工程应用研究,试验段经过现场检测,工程应用效果良好,具有较好的经济效益。

The application of steel slag in road materials is one of the important ways for the large-scale consumption of steel slag.Cement steel slag stabilized soil is a new type of pavement base material.In this paper,the effects of cement dosage and steel slag content on the unconfined compressive strength and splitting strength of cement steel slag stabilized soil were studied.At the same time,the effect of steel slag content on the drying shrinkage performance of cement steel slag stabilized soil was also discussed.The results show that with the increase of steel slag content,the unconfined compressive strength and splitting strength of cement steel slag stabilized soil gradually increase,the flexural-compressive strength ratio increases first and then decreases,and the drying shrinkage coefficient gradually decreases.With the increase of cement dosage,the 28 and 90 d unconfined compressive strength and splitting strength of cement steel slag stabilized soil gradually increase.When the cement dosage increases to 5% (mass fraction),the flexural-compressive strength ratio decreases to a certain extent.The engineering application research is carried out by using the mixture ratio(mass fraction)of 5% cement(extra-mixing),60% of steel slag,and 40% of soil.The test section has been tested on site,and the engineering application effect is good and the economic benefit is good.