Performance Research and Infrared Spectroscopy Analysis of Asphalt Concrete with Iron Tailings
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摘要:
这是一篇陶瓷及复合材料领域的论文。本文分析了不同铁尾矿掺量的沥青混合料的性能，并对沥青混合料的抵抗车辙性能、水稳定性、抗裂性能进行分析，进而验证铁尾矿应用于低等级道路中面层的可行性。结果表明：弯拉强度在在掺量从20%到40%时下降幅度较大；浸水残留稳定度在掺量为20%后增长幅度开始下降。随着铁尾矿掺量不断增大，铁尾矿沥青混凝土FT-IR图谱在局部出现了较小的、新的吸收峰且对原有吸收峰也出现了增强，这说明了掺入铁尾矿后，沥青混凝土与其发生了化学反应，且改变了原有沥青内部结构，进而会产生新的官能团。随着铁尾矿掺量不断增大，铁尾矿沥青混凝土沥青环烷烃和烷烃C-H官能团面积占比却呈现出先增大后减小的趋势，且铁尾矿掺量为20%时，沥青环烷烃和烷烃C-H官能团面积占比达到较大。
Abstract:This is an article in the field of ceramics and composites. The performance of asphalt mixtures with different iron tailings content was analyzed. The rutting resistance, water stability and crack resistance of the asphalt mixture were analyzed. This verified the feasibility of iron tailings applied to the middle surface of low-grade roads. The results showed that the flexural strength decreased the most when the dosage was from 20% to 40%. The increase rate of immersion residue stability began to decrease after the dosage was 20%. As the content of iron tailings continued to increase, the FT-IR spectrum of iron tailings asphalt concrete showed a small, new absorption peak locally and an enhancement to the original absorption peak. This showed that after the addition of iron tailings, the asphalt concrete chemically reacted with it, and the internal structure of the original asphalt was changed and new functional groups were generated. With the increasing content of iron tailings, the proportion of the area of cycloalkane and alkane C-H functional groups in the asphalt concrete of iron tailings asphalt concrete showed a trend of first increasing and then decreasing. And when the iron tailings content was 20%, the area ratio of asphalt naphthenic and alkane C-H functional groups reached the maximum.
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Key words:
- Ceramics and composites /
- Iron tailings /
- Rutting resistance /
- Water stability /
- Crack resistance /
- Absorption peak
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表 1 90#国标沥青的技术指标
Table 1. Technical indicators of 90# national standard asphalt
检测指标 规范
要求实验
结果针入度（25 ℃，100 g，5 s）/（0.1 mm） 60～80 68.0 延度（5 cm/min，5 ℃）/cm ≥30 38.0 软化点/℃ ≥55 74.5 180 ℃/135 ℃粘度/(Pa/s) ≤3.0 1.55 TFOT 后残留物
( 163 ℃，5 h)质量变化/% ≤±1.0 -0.15 针入度比/% ≥60 74.2 延度( 5 ℃) /% ≥20 26.2 
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