Determination of volumetric parameters and impacting mechanism of water stability for steel slag asphalt mixture
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摘要: 通过浸渍试验测定了不同粒径钢渣集料的有效相对密度, 提出了钢渣沥青混合料体积参数的确定方法, 采用残留稳定度、冻融劈裂强度比与沥青膜厚度对不同钢渣掺量的沥青混合料水稳定性进行评价, 借助X射线荧光光谱分析、扫描电镜试验和压汞试验, 从钢渣化学组成与微观结构方面分析了钢渣对沥青混合料水稳定性的影响机理。分析结果表明: 对于钢渣等吸水性较大集料, 采用浸渍试验实测的有效相对密度较计算法得到的有效相对密度增大了1.5%, 更接近集料的实际有效相对密度, 因此, 采用浸渍试验确定的钢渣沥青混合料体积参数更加合理; 随着钢渣掺量增大, 钢渣沥青混合料水稳定性逐渐提升, 当钢渣掺量为70%时, 钢渣沥青混合料的残留稳定度提高了12%, 冻融劈裂强度比提高了13%;钢渣沥青混合料沥青膜厚度随钢渣掺量增大而增大, 当钢渣掺量为70%时, 沥青混合料的沥青膜厚度增大了13%, 较厚的沥青膜可有效防止水分入侵, 并增大集料表面“结构沥青”含量, 从而提高钢渣沥青混合料的水稳定性; 钢渣沥青混合料沥青膜厚度计算值为67μm, 由于其水稳定性与沥青膜厚度正相关, 故推荐基于水稳定性的钢渣沥青混合料的沥青膜厚度为7μm; 钢渣呈超碱性, 表面多孔隙, 孔隙内部结构复杂, 增大了钢渣集料与沥青间有效接触面积, 并形成较好的机械咬合力, 提高了钢渣集料与沥青之间的黏结性, 可显著改善沥青混合料的水稳定性。Abstract: The effective relative densities of steel slag aggregates with different sizes were tested by immersion test, and the determining method of volumetric parameters for steel slag asphalt mixture was proposed.The water stabilities of asphalt mixtures with different steel slag contents were comprehensively evaluated by residual stability, freezing-thawing splitting intensity ratio and asphalt film thickness.X ray fluorescence spectrometry, scanning electron microscope, and mercury injection test were used to analyze the influencing mechanism of steel slag on the water stability of asphalt mixture based on the chemical compositions and microstructure of steel slag.Analysis result shows that for large water imbibition aggregates such as steel slag, the effective relative density measured by immersion test is 1.5% higher than the value obtained by the calculation method, and is closer to the actual density, therefore, it is more reasonable to useimmersion test to determine the volumetric parameters of steel slag asphalt mixture.The water stability of steel slag asphalt mixture improves with the increase of steel slag content.The residual stability increases by 12% and the freezing-thawing splitting intensity ratio increases by13% when the steel slag content is 70%.The asphalt film thickness of steel slag asphalt mixture gradually increases with the increase of steel slag content.When the content of steel slag is 70%, the asphalt film thickness increases by 13%.The thicker asphalt film can effectively prevent water intrusion and increase the content of structural asphalt on aggregate surface, so the water stability of steel slag asphalt mixture increases.The calculation value of asphalt film thickness of steel slag asphalt mixture is 6-7μm, and the water stability of steel slag asphalt mixture is positively related to the thickness of asphalt film, so the recommended value of asphalt film thickness is 7μm based on the water stability of steel slag asphalt mixture.The steel slag is super alkaline and porous, meanwhile, the internal structures of pores are complex, therefore, the effective contact area between steel slag aggregate and asphalt increases, the good mechanical occlusal force forms, and the adhesion increases, so that the water stability of asphalt mixture improves significantly.
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Key words:
- pavement material /
- steel slag asphalt mixture /
- microstructure /
- volumetric parameter /
- water stability
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图 4 相对密度与集料粒径关系
Figure 4. Relationships between relative density and grain size of aggregate
图 6 最佳油石比与钢渣掺量关系
Figure 6. Relationships between optimal bitumen ratio and steel slag content
图 7 钢渣沥青混合料合理体积参数确定流程
Figure 7. Determining process of reasonable volumetric parameters of steel slag asphalt mixture
图 10 钢渣沥青混合料沥青膜厚度比较
Figure 10. Asphalt film thickness comparison of steel slag asphalt mixture
表 4 不同钢渣掺量沥青混合料级配
Table 4. Gradations of asphalt mixture with different steel slag contents
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表 5 钢渣沥青混合料的体积参数与力学指标
Table 5. Volumetric parameters and mechanical indexes of steel slag asphalt mixture
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