Rheology and Infrared Spectrum of Diatomite Asphalt Concrete
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摘要:
这是一篇陶瓷及复合材料领域的论文。为了研究硅藻土掺量对沥青混合料的物理性质、流变性能以及路用性能的影响，开展了不同硅藻土掺量作用下的沥青混合料基本物理实验、流变实验、高温稳定性和低温抗裂性能实验。结果表明：在硅藻土掺量为30%时，沥青混合料的软化点、锥入度和延度达到极大值，以及在硅藻土掺量为40%时，沥青混合料的针入度达到极大值，而延度的变化规律却呈现出不断增大的趋势。而温度为170 ℃作为沥青混合料的制备温度以及选取硅藻土掺量为30%作为沥青混合料低温抗裂性能较优值。同时，掺加硅藻土可以有效地提升沥青混合料的高温性能，但过量掺入硅藻土会弱化其高温性能。随着硅藻土掺量不断增大，沥青混凝土红外光谱中部分特征峰峰值的变化规律呈现出不断减小的趋势，且在沥青混凝土老化过程中，其内部的轻质组分受到高温的影响，发生了挥发现象，但是随着硅藻土掺量的不断增大，沥青混凝土老化后的轻质组分对应的特征峰峰值变化幅度却不大。
Abstract:This is an article in the field of ceramics and composites. In order to study the influence of diatomite content on the physical properties, rheological properties and road performance of asphalt mixtures, the basic physical tests, rheological tests, high temperature stability and low temperature crack resistance tests were carried out on asphalt mixtures under different diatomite content.The results show that when the diatomite content is 30%, the softening point, cone penetration and ductility of the asphalt mixture reach the maximum. When the diatomite content is 40%, the penetration of the asphalt mixture reaches the maximum. The law of change in ductility shows an increasing trend. The temperature is 170 ℃ as the preparation temperature of the asphalt mixture. The 30% diatomite content can be selected as the optimal value of low temperature crack resistance of asphalt mixture. At the same time, adding diatomite can effectively improve the high temperature performance of the asphalt mixture, but excessive incorporation of diatomaceous earth will weaken its high temperature performance. As the content of diatomite continues to increase, the variation of some characteristic peaks in the infrared spectrum of asphalt concrete shows a decreasing trend. During the aging process of asphalt concrete, its internal light components are affected by high temperature, and volatilization occurs. However, as the content of diatomite continues to increase, the characteristic peak-to-peak value of the light component of asphalt concrete after aging has not changed much.
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表 1 石灰岩的筛分结果
Table 1. Limestone screening results
粒径分布/mm +9.50 -9.50+4.75 -4.75+2.36 -2.36 含量/% 69.40 28.30 1.20 1.10 
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表 2 矿粉的粒径分布测定结果
Table 2. Measurement results of particle size distribution of mineral powder
粒径分布/μm +10.5 -10.5+5.23 -5.23+2.61 -2.61+1.31 -1.31+0.65 -0.65+0.33 -0.33 百分比/% 2.91 7.24 29.69 34.96 15.11 7.54 2.55
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表 3 沥青的技术指标
Table 3. Technical indicators of 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 67.0 延度（5 cm/min，5 ℃）/cm ≥30 39.0 软化点/℃ ≥55 75.5 180 ℃/135 ℃粘度/（Pa/s） ≤3.0 1.50 TFOT 后残留物
( 163 ℃，5 h)质量变化/% ≤±1.0 -0.10 针入度比/% ≥60 75.3 延度( 5 ℃) /% ≥20 25.7
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