Ren Zhibin, Zhu Yongqiang, Wu Qi, Zhu Minye, Guo Feng, Yu Huayang, Yu Jiangmiao
Research and Development Centre of Transport Industry of Technologies, Materials and Equipment of Highway Construction and Maintenance, Gansu Road and Bridge Group Co. Ltd., Lanzhou 730050, China.
School of Civil Engineering and Transportation, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510000, China.
Nanomaterials (Basel). 2020 Mar 30;10(4):641. doi: 10.3390/nano10040641.
The storage stability concern, caused by phase separation for the density difference between polymers and asphalt fractions, has limited the widespread application of polymer modified asphalt (PMA). Therefore, this study aims to improve the storage concern of PMA by incorporating nano-montmorillonite. To this end, different nano-montmorillonites were incorporated to three PMAs modified with three typical asphalt modifiers, i.e., crumb rubber (CRM), styrene-butadiene-rubber (SBR) and styrene-butadiene-styrene (SBS). A series of laboratory tests were performed to evaluate the storage stability and rheological properties of PMA binders with nano-montmorillonite. As a consequence, the incorporation of nano-montmorillonite exhibited a remarkable effect on enhancing the storage stability of the CRM modified binder, but limited positive effects for the SBR and SBS modified binders. The layered nano-montmorillonite transformed to intercalated or exfoliated structures after interaction with asphalt fractions, providing superior storage stability. Among selected nano-montmorillonites, the pure montmorillonite with Hydroxyl organic ammonium performed the best on enhancing storage stability of PMA. This paper suggests that nano-montmorillonite is a promising modifier to alleviate the storage stability concern for asphalt with polymer modifiers.
聚合物与沥青组分之间的密度差异导致相分离，引发了储存稳定性问题，这限制了聚合物改性沥青（PMA）的广泛应用。因此，本研究旨在通过掺入纳米蒙脱土来改善PMA的储存问题。为此，将不同的纳米蒙脱土掺入到三种用三种典型沥青改性剂改性的PMA中，这三种改性剂分别是胶粉（CRM）、丁苯橡胶（SBR）和苯乙烯-丁二烯-苯乙烯（SBS）。进行了一系列实验室测试，以评估含纳米蒙脱土的PMA结合料的储存稳定性和流变性能。结果表明，掺入纳米蒙脱土对提高CRM改性结合料的储存稳定性有显著效果，但对SBR和SBS改性结合料的积极作用有限。层状纳米蒙脱土与沥青组分相互作用后转变为插层或剥离结构，从而提供了优异的储存稳定性。在所选的纳米蒙脱土中，含羟基有机铵的纯蒙脱土在提高PMA储存稳定性方面表现最佳。本文表明，纳米蒙脱土是一种有前景的改性剂，可缓解含聚合物改性剂沥青的储存稳定性问题。
