Abstract
The increase in cost of bitumen and polymer modifiers and the importance of silicon waste material management have encouraged pavement researchers to use reusable sustainable sources. Oil shale waste powder (OSP) is considered a silicon waste material, and when used in pavement prevents leaching. However, OSP, as an acidic inorganic material, has compatibility issues with asphalt, and its use with ashpalt should be considered carefully. This paper investigates the pavement performance and modification mechanism of OSP and silane coupling agent (SCA) composite modified asphalt and asphalt mixture according to conventional physical property tests: thermogravimetric analysis (TGA), fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and a pavement performance test. The test results showed that the incorporation of OSP and SCA improved the overall properties of asphalt and asphalt mixture and the direct mixing method is more effective than the surface pretreatment method for the modification of composite modification of asphalt. Moreover, the FTIR test and DSC test indicated that the incorporation of OSP and SCA creates new chemical bonds and changes the form and quantity of the crystalline component and the transformation of components in the bitumen.
Highlights
Asphalt has been widely used in airfield and high-grade road pavement due to its numerous advantages such as smoothness, low-vibration, high-automated construction, and easy maintenance [1,2,3,4]
The silane coupling agent (SCA) in Oil shale waste powder (OSP)/SCA composite modified asphalt has a silicon functional group and an organic group, and the silicon functional group can react with the hydroxyl group on the surface of aggregate to form a chemical bond; the organic group can react with asphalt to achieve chemical bonding, thereby the two materials of very different properties of asphalt and aggregate are “coupled” by chemical bonds, and the chemical bonding reaction is confirmed by fourier transform infrared spectroscopy (FTIR) test in the Section 5.3
The pavement performance and modification mechanism of oil shale waste powder, silane coupling agent composite modified asphalt, and asphalt mixture was systematically investigated according to conventional physical property tests: thermogravimetric analysis (TGA) test, FTIR test, differential scanning calorimetry (DSC) test, DSR test, and pavement performance test
Summary
Asphalt has been widely used in airfield and high-grade road pavement due to its numerous advantages such as smoothness, low-vibration, high-automated construction, and easy maintenance [1,2,3,4]. In the past few years, studies regarding alternative environmental friendly materials in asphalt pavement to improve its mechanical properties have been conducted [18,19,20,21]. To effectively reduce and prevent the occurrence of ravelling damages in OGFC pavements, technologies adding the modifier are effective for prolonging the OGFC pavement service life [42,43] Such types of modifiers have high cost, restricting their application in modifying paving asphalt. The pavement performance and modification mechanism of oil shale waste powder and silane coupling agent composite modified asphalt and asphalt mixture are systematically investigated according to conventional physical property tests: TGA test, FTIR test, DSC test, DSR test, and a pavement performance test. The preparation method of the oil shale waste powder and silane coupling agent composite modified asphalt and the surface pretreatment method and direct mixing method are discussed in this paper
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