Characteristics of warm mixed asphalt modified by waste polymer and nano-silica
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Characteristics of warm mixed asphalt modified by waste polymer and nano-silica Hayder Abbas Obaid* Civil engineering department, College of engineering, University of Babylon, Babylon, Iraq Received 9 March 2020; received in revised form 2 September 2020; accepted 2 September 2020
Abstract
The current research studied the characteristics of warm mixture asphalt (WMA) contain Polypropylene polymer (PP) and Nano- silica particles (NS). Two kinds of WMA were used: unmodified WMA and modified WMA contain 3% PP and NS (2-5) % by total weight of asphalt. The performance tests conducted to evaluate performance are: moisture resistance test, rutting resistance test, and fatigue resistance test. The obtained results refers that addition Nano- silica and Polypropylene improves performance of WMA. Also the results reveals that addition of Nano- silica and polypropylene as asphalt modifiers increase durability and improve performance of warm mixtures asphalt. Keywords: Fatigue resistance test; Moisture resistance test; Nano-silica; Rutting resistance test; Warm mixture asphalt; Polypropylene
1. Introduction According to the temperature level required during mixing process of asphalt mixtures in asphalt plants, asphalt mixtures were classified into three groups: hot mix asphalt (HMA), warm mix asphalt (WMA) and cold mix asphalt (CMA). WMA technology summarizes the using of different types of additives in asphalt mixes during mixing to reduce mixing temperature through reducing viscosity of asphalt binder by foaming action (spray water), in addition to increasing workability during hauling and compaction at low temperatures. This reduction in temperature will reduce the level of oxidation of the asphalt binder, which can outcome the increase in the resistance to fatigue and oxidation [14]. Meanwhile, the lower temperature rate for WMA mixtures is considered as disadvantage, due to reduction in the adhesion between binder and aggregate particles (“stripping”) which may reflected on reducing moisture and rutting resistance [5-8]. There are different studies showed that WMA mixtures can have properties similar and even higher to those of HMA [9-14]. On the other hand, several studies showed that the performance of WMA mixtures are lower than that of HMA mixtures, mainly in rutting resistance and moisture damage [15-23]. Modification of asphalt mixtures by using different types of polymer consider as one of the common methods to increase life time and improve performance. The addition of polymer into
* Corresponding author E-mail address: [email protected] (H. A. Obaid). Peer review under responsibility of Chinese Society of Pavement Engineering.
asphalt mixture enhance cohesion between asphalt and aggregate. In another hand, the researchers indicated the significant impact of using nanomaterials with polymers in enhancing the properties of asphalt due to the excellent characteristics like small particle size of nanomateria
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