Fig 1 - uploaded by Carlos Obando
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Based on the promoting effect of metal material on the healing property of asphalt binder, this study evaluated the merits of using taconite (an iron-containing filler from iron-mine tailings) to promote the healing performance of asphalt binder. Samples of asphalt binder modified with three different dosages of taconite were tested by a thermal co...
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... 2.51 cmðhÞ × 1.95 cmðrÞ. The TC of asphalt binders with different contents of taconite was determined based on the method developed by Obando and Kaloush (2020). The steps of the experiment are as follows: 1. Preheat oven to 160°C. 2. Place samples in oven and heat them until they can be easily poured into mold. 3. Pour samples into testing mold (Fig. 1). Ensure that pouring process is slow, and ensure that pouring height is slightly higher than mold height. 4. Place samples with mold in flat position for a period of time to cool to room temperature, being careful to avoid contaminating the surface of the test piece. 5. Place samples in cooling device for about 20 min, then remove ...
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Citations
... After conducting 100 h of UV aging, the healing capacity still showed a promoting trend; the values were 34.87, 35.61, 38.95, and 44.84%, respectively. This indicates that taconite can enhance the healing performance of bitumen due to the role of taconite in promoting its thermal conductivity, which is consistent with the results of our published paper [46]. Higher thermal conductivity can make the temperature of binders increase more quickly and reach a critical point that drives the asphalt binder to start the healing behavior. ...
... The longer the aging time, the slower the decay rate of the healing ability. When adding 30% taconite content, the healing index of bitumen modified by 1% PPA were 46 ...
This study examines how aging affects the healing capacity of bituminous composites containing polyphosphoric acid (PPA). PPA is commonly used in bituminous composites to enhance its elasticity, however, PPA effectiveness highly depends on other constituents on the matrix and the environmental (internal and external) factors. In terms of internal factors, the interplay between PPA and various bitumen modifiers have been extensively studied. Here, we study how external factors such as exposure to ultraviolet radiation affect PPA’s efficacy, measured in terms of change in bitumen’s healing index. The study results showed that the introduction of PPA to bituminous composites significantly increases the bitumen healing index, however, the change in the healing index becomes less pronounced as aging progresses. The presence of additives such as taconite were found to affect the effect of PPA on bitumen’s healing index. For instance, bitumens containing 30% taconite showed the highest increase in their healing index in the presence of PPA among studied scenarios. Overall, bitumen containing PPA had a higher healing index than those without PPA regardless of the extent of aging and dosage of modifiers. This, in turn, indicates that PPA is highly effective for enhancing bitumen healing. This can be attributed to the role of PPA in promoting intermolecular interactions within the bitumen matrix.
