Research on Mortar-aggregate Adhesion and TG-DSC Test of Iron Tailings Asphalt Concrete
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摘要:
在研究铁尾矿粉掺入沥青混凝土中的力学性能和路用性能的基础上，分析了铁尾矿粉掺量对沥青胶浆-集料粘附性的影响，并开展了不同铁尾矿粉掺量下沥青混凝土的TG和DSC实验。结果表明，综合不同铁尾矿粉掺量作用下沥青混凝土胶浆基本物理性能指标的变化规律，得到在铁尾矿粉掺量为60%时，沥青混凝土各项指标达到较佳值，且此时沥青混凝土的路用性能也能完全满足公路道路的使用要求。随着铁尾矿粉掺量的不断增大，沥青胶浆接触角和表面能与粘附功和剥落功的变化规律呈现出先增大后减小的趋势，且在铁尾矿粉掺量为60%时取得较大值。同时，铁尾矿粉的掺入可以有效地提升沥青混凝土的耐热性能以及有效地提升了沥青混凝土热稳定性。
Abstract:On the basis of studying the mechanical properties and road performance of iron tailings powder mixed into asphalt concrete, the influence of iron tailings powder content on asphalt mortar-aggregate adhesion is analyzed. In addition, TG and DSC tests of asphalt concrete with different iron tailings powder content have been carried out. The results show that the basic physical performance index of asphalt concrete mortar under the action of different iron tailings powder content is comprehensive, and it is obtained that when the iron tailing powder content is 60%, the various indicators of asphalt concrete reach the best value. At this time, the road performance of asphalt concrete can also fully meet the requirements of highway road use. With the increasing content of iron tailings powder, the change law of the contact angle and surface energy of the asphalt mortar and the adhesion work and peeling work showed a trend of first increasing and then decreasing. The maximum value is achieved when the iron tailings powder content is 60%. At the same time, the incorporation of iron tailings powder can effectively improve the heat resistance of asphalt concrete and effectively improve the thermal stability of asphalt concrete.
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表 1 该石油沥青的基本性能
Table 1. Basic performance of the petroleum asphalt
检测指标 规范要求 实验结果 针入度（25℃，100 g，5 s）/（0.1 mm） 80~100 88.0 延度（5 cm/min，5℃）/cm ≥100 148.0 软化点/℃ ≥42 45.0 180℃/135℃粘度/ Pa·s ≤3.0 0.55 TFOT 后残留物
（163℃，5 h）质量变化/% ≤±0.8 -0.05 针入度比/% ≥61 74.2 延度( 5℃) /% ≥15 30.2 
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