碱激发固废道路补强材料的制备与性能  

Preparation and properties of alkali-activated solid waste road reinforcement material

作　　者：冀欣 王振军[1] 赵昕 余振发 王笑风 徐梦达 JI Xin;WANG Zhen-jun;ZHAO Xin;YU Zhen-fa;WANG Xiao-feng;XU Meng-da(School of Material Science and Engineering,Chang’an University,Xi'an 710061,Shaanxi,China;Shaanxi Provincial Communications Planning&Design Institute Co.,Ltd.,Xi'an 71065,Shaanxi,China;Henan Provincial Communications Planning&Design Institute Co.,Ltd.,Zhengzhou 450052.Henan,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710061 [2]陕西省交通规划设计研究院有限公司,陕西西安710065 [3]河南省交通规划设计研究院有限公司,河南郑州450052

出　　处：《长安大学学报（自然科学版）》2022年第3期99-111,共13页Journal of Chang’an University(Natural Science Edition)

基　　金：陕西省交通科技项目(21-53K);新疆生产建设兵团科技攻关项目(2021DB005);国家重点研发计划项目(2017YFB0309903-02)。

摘　　要：针对传统无机类道路补强材料存在造价昂贵、碳排放和耗能大,亟需研发新型绿色环保道路补强材料的问题,考虑碱激发固废补强材料性能方面产生的协同效应,以水玻璃和氢氧化钠为激发剂,低钙粉煤灰为基础粉料,探讨了高炉矿渣粉和钢渣微粉作为复合粉料共同制备无机路面修补料的可能性。通过室内试验研究了复合粉料掺量(质量分数,下同)分别为50%和70%时,对标准养护净浆试样凝结时间、流动度、黏度、抗压强度和抗折强度的影响,并采用X射线衍射、扫描电镜和红外光谱分析了硬化浆体的凝胶产物、微观结构和键合类型。结果表明:与纯水泥净浆相比,各配比下粉煤灰基复合浆体凝结时间明显增加;钢渣可改善浆体的流动性能,但过多高炉矿渣的掺加会因早期水化产物增多而影响浆体的流动性能;复合浆体的黏度与流动性能具有较强的相关性。力学性能方面,高炉矿渣对硬化浆体的早期强度起着决定性作用。钢渣活性虽然较低,但可以发挥物理填充作用,当钢渣掺量为10%时,硬化浆体的力学性能最优。在水化过程中,钢渣所起的化学作用小于矿渣和粉煤灰,随着钢渣掺量的增大、矿渣掺量的减小,浆体力学强度下降,但钢渣在后期的反应活性较高。高钢渣掺量的硬化浆体表面松散且孔隙结构较大,而高掺量高炉矿渣硬化浆体表面致密且均一,板状和三维网状的凝胶产物填充了孔隙并促进了致密微观结构的形成。Aimed at the problems that traditional inorganic road reinforcement materials exist expensive,carbon emissions and energy consumption,and the argently need-development of new green road reinforcement materials.The synergistic effects arising from the performance aspects of alkali-excited solid waste reinforcing materials were investigated.The possibility of preparing inorganic pavement repair materials together with blast furnace slag(BFS)and steel slag(SS)micronized powder as a composite powder was explored,water glass and sodium hydroxide as excitants and low calcium fly ash(FA)were used as the base powder.Effects of composite powder content(mass fraction,the same below)of 50%and 70%on setting time,flow,viscosity,compressive strength and flexural strength of standard cured paste samples were studied through laboratory experiments.In addition,X-ray diffraction,scanning electron microscopy and infrared spectroscopy were used to analyze gel product,microstructure and bonding type of hardened paste.The results show that compared with pure cement paste,the setting time of FA-based paste is significantly increased at each ratio.SS improves the flow of paste,but too much BFS can affect flow due to the increase of early hydration products.The viscosity of composite paste has a strong correlation with flow property.In terms of mechanical properties,BFS plays a decisive role in early strength of hardened paste.Although the activity of SS is low,it plays a physical filling effect.When the content of SS is 10%,the mechanical properties of hardened paste are optimal.The chemical effect of SS in hydration process is less than that of BFS and FA.The strength of paste decreases as the content of SS increases and content of BFS decreases,but the degree of reaction of SS in the later stage is higher.The surface of hardened paste with high SS content is loose and the pore structure is large,while the surface of paste with high content of BFS is dense and uniform.The plate-like and three-dimensional network gel product filled pore

关 键 词：道路工程 道路补强材料 碱激发 工业废渣 路用性能 高炉矿渣 钢渣 

分 类 号：U414[交通运输工程—道路与铁道工程]