Rheological behavior of bitumen mixed with Trinidad lake asphalt
Rheological behavior of bitumen mixed with Trinidad lake asphalt
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DOI：
10.1016/j.conbuildmat.2014.05.068
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发表时间：
2014-09
影响因子：
7.4
通讯作者：
M. Liao;J. S. Chen;G. Airey;Shi Jing Wang
中科院分区：
文献类型：
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作者：
M. Liao;J. S. Chen;G. Airey;Shi Jing Wang
特立尼达湖沥青(TLA)已被用作改性剂，与传统的石油沥青混合，用于需要高稳定性路面的道路和桥梁应用。本工作旨在评价TLA对特立尼达湖改性沥青(TLMA)流变性的影响。确定了矿物颗粒相互作用时共混物中TLA的临界质量分数。试验结果表明，TLA对沥青有一定的硬化作用，但硬化程度随TLA浓度的不同而变化较大。由于在沥青结合料中引入TLA，导致复数模数(G*)和弹性响应(δ)的增加，具有改善抗车辙性能的潜在好处。此外，在0.05 GHz的频率下，由Cross模型得到的零剪切粘度(ZSV)等于低剪切粘度(LSV)，而从Carreau模型得到的ZSV在0.1 GHz时接近于LSV。稳态粘度(SSV)具有最低的值，在0.5赫兹时近似等于LSV。根据SSV硬化效应，建议TLA的用量为天然改性沥青重量的20%~33%。
Trinidad lake asphalt (TLA) has been utilized as a modifier to blend with conventional petroleum bitumen for road and bridge applications where highly stable surfacings are required. The aim of this work was to evaluate the effect of TLA on rheological properties of Trinidad lake modified asphalt (TLMA). The critical content of TLA in the modified blend by weight was determined as the interaction of mineral particles occurred. Test results showed that TLA stiffened asphalts, but the degree of stiffening varied significantly with the TLA concentration levels. An increase in complex modulus (G*) and elastic response (δ) resulting from the introduction of TLA to asphalt binders had the potential benefit of improving resistance to rutting. In addition, zero shear viscosities (ZSVs) obtained from the Cross model were equal to the low shear viscosities (LSVs) at a frequency of 0.05 Hz, while the ZSVs from the Carreau model were close to the LSVs at 0.1 Hz. Steady state viscosities (SSVs), having the lowest values, approximately equaled the LSVs at 0.5 Hz. The concentration of TLA was recommended to be in the range of 20–33% by the weight of naturally modified asphalt according to the SSV stiffening effect.