钢渣细集料对水泥稳定砂岩基层路用性能影响研究  

Effect of Steel Slag Fine Aggregate on Road Performance of Cement Stabilised Sandstone Base Layer

作　　者：李超 姜运良 李绍勇 颜峰[2] 汤长西 李晓龙 LI Chao;JIANG Yunliang;LI Shaoyong;YAN Feng;TANG Changxi;LI Xiaolong(China Railway Construction Yunnan Investment Co.,Ltd.,Kunming 650032,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Provincial Institute of Highway Science and Technology,Kunming 650051,China)

机构地区：[1]中铁建云南投资有限公司,昆明650032 [2]昆明理工大学建筑工程学院,昆明650500 [3]云南省公路科学技术研究院,昆明650051

出　　处：《硅酸盐通报》2024年第3期1172-1180,共9页Bulletin of the Chinese Ceramic Society

基　　金：云南省交通运输厅创新及示范项目(云交科教便【2021】39号)。

摘　　要：钢渣应用于路面基层时既能提高钢渣的综合利用,又有助于减少天然砂石材料的消耗。为了分析钢渣细集料对水泥稳定砂岩基层(CSSB)路用性能的影响,本文比较分析了不同钢渣细集料置换石灰岩细集料条件下CSSB的抗压强度、劈裂强度、收缩性能和水稳定性,并运用SEM结合能谱揭示了钢渣细集料对CSSB微观结构的影响。结果表明:钢渣细集料能够有效提高CSSB的后期强度,其中100%(质量分数)钢渣细集料置换率下CSSB的60 d强度相较于未掺钢渣试样提高了18.7%,但对CSSB的早期强度存在一定的负面影响;钢渣细集料能够改善CSSB的收缩性能,且掺量越高,改善性能越明显;尽管钢渣细集料能够提高CSSB的长期水稳定性,但会降低其短期的水稳定性。与未掺钢渣试样相比,28 d龄期时,100%钢渣细集料置换率下CSSB界面过渡区的m(Ca)/m(Si)质量比降低了62.95%,C-S-H凝胶明显增多,结构更密实。研究表明,通过控制合理的掺量,钢渣细集料可以作为传统砂石细集料的替代品,在路面基层中具有良好的应用前景。The application of steel slag to pavement subgrade can improve the comprehensive utilization of steel slag as well as help to reduce the consumption of natural sand and gravel materials.In order to analyse the effect of steel slag fine aggregate on road performance of cement stabilised sandstone base layer(CSSB),the compressive strength,splitting strength,shrinkage properties and water stability of CSSB were comparatively analysed under different steel slag fine aggregate replacement limestone fine aggregate,and SEM combined with energy spectroscopy were used to reveal the effect of steel slag fine aggregate on microstructure of CSSB.The results show that steel slag fine aggregate can effectively improve late strength of CSSB,in which the 60 d strength of CSSB with 100%steel slag fine aggregate replacement rate increases by 18.7%compared with that of undoped steel slag specimens,however,there is a certain negative effect on the early strength of CSSB.Steel slag fine aggregate can improve shrinkage properties of CSSB,and the higher the doping amount,the more obvious the improvement of the performance.Although steel slag fine aggregate can improve the long-term water stability of CSSB,it will reduce its short-term water stability to some extent.Compared with the undoped steel slag samples,m(Ca)/m(Si)ratio in the interface transition zone of CSSB with 100%steel slag fine aggregate replacement rate at the age of 28 d reduces by 62.95%,and the C-S-H gel is obviously increases,with a denser structure.The study shows that by controlling the reasonable content,steel slag fine aggregate can be used as a substitute aggregate for traditional sand and gravel fine aggregate,and has a good application prospect in the pavement base layer.

关 键 词：道路工程 钢渣细集料 砂岩 路面基层 收缩性能 水稳定性 

分 类 号：U414[交通运输工程—道路与铁道工程]