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The aged polymer modified asphalt (abbreviated as PMA) was recycled with two methods which were adding fresh PMA and adding recycling agent to investigate the recycling characteristics of PMA. The performance of the recycled PMA was evaluated systematically with a variety of indices, including penetration, softening point, ductility, viscoelasticity and stiffness. The results indicate that the performance...
Styrene butadiene rubber (SBR) modified asphalt emulsions were prepared by means of SBR latex adding to aqueous solution, and it is an energy-saving, ecologically safe material because it does not need any heating processes creating gas emission and fire hazard during its use. The objective of this work was to analyze the temperature performance of SBR modified asphalt emulsions for enhancing the...
Montmorillonite (MMT) is a typical layered silicate. It has been widely used to modify polymers. In recent years, layered silicate has been receiving more attention from researchers in the civil engineering field, especially the organic nano-montmorillonite (OMMT). Flexible pavement plays an important role in structures of the primary highway at present. With the development of road traffic, asphalt...
The requirements for modified bitumen are increasing according to the higher load condition and worse serving environment in modern highway construction. And with the development of nano-technology in material design, it is found that polymer modifier combined with layer silicate can obviously improve the using properties. Nanometer montmorillonite (MMT) modified asphalt concrete is a kind of composite...
Environment acceptable modified natural macromolecule based drilling fluid is mainly composed of shale inhibitor agent IND30, fluid loss control agent NAT20, bloomless white asphalt NFA-25 and dry powder of polyalcohols PGCS-1, which are biodegradable and environment acceptable. Results of rheological property tests of based mud, IND30 mud, NAT20 mud, NFA-25 mud and environment acceptable modified...
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