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研究中使用AC-10(黏度分级)为软化剂,控制目标黏度为2 000poise,根据再生配比设计计算沥青用量。接着对焚化炉底渣以及回收沥青混凝土进行基本物理性质试验,添加不同含量的焚化炉底渣和回收沥青混凝土,评估两者对于沥青混凝土松弛模量以及疲劳性能的影响。试验结果显示,回收沥青混凝土取代量高会使得松弛模量最大值提高,添加RAP的试件的最大值为未添加的1.5~2倍,推测为回收料所含的老化沥青使试件劲度提高所造成的影响。而天然粒料取代量高的情况下,试件松弛模量平缓值有下降的趋势,这可能受底渣本身多孔易碎性的结构特性影响。当RAP添加量20%以内及底渣添加量20%以内时,松弛速率影响较小。在试件疲劳寿命部分,以劲度曲线、累积消散能、能量比、消散能比等方式评估疲劳寿命,并比较其差异。回收料含量高的试件,微观裂缝发生的荷载次数有下降趋势,底渣含量增加至30%时较易生成微观裂缝;而底渣含量增加至30%以及RAP含量增加至40%时,疲劳寿命有下降的趋势。
In the study, AC-10 (viscosity grade) was used as a softener to control the target viscosity of 2,000 poise, and the asphalt dosage was calculated according to the regeneration ratio. Then, the basic physical properties of incinerator bottom slag and recycled asphalt concrete were tested, different incinerator bottom slag and asphalt concrete were recovered, and the influence of both on the slack modulus and fatigue performance of asphalt concrete was evaluated. The test results show that the high replacement of asphalt concrete will make the maximum relaxation modulus increase, the maximum value of the sample with RAP added 1.5 to 2 times the non-added, presumably the aged asphalt contained in the recovered material so that the specimen stiffness Increase the impact. However, when the natural granule is replaced by a high amount, the flatness value of the relaxation modulus tends to decrease, which may be affected by the structural characteristics of porous friable bottom slag itself. When the content of RAP is less than 20% and the amount of bottom slag is less than 20%, the relaxation rate has little effect. Fatigue life in the part of the specimen, the stiffness curve, cumulative dissipation energy, energy ratio, energy dissipation ratio, etc. to assess the fatigue life, and compare the differences. When the content of bottom slag increased to 30%, the microscopic cracks were more likely to occur. When the content of bottom slag increased to 30% and the content of RAP increased to 40%, the fatigue load Life expectancy declines.