Fiber Additives in Asphalt Mixtures (2015) / Chapter Skim
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7 CHAPTER TWO LITERATURE REVIEW: USE OF FIBER ADDITIVES IN ASPHALT MIXTURES be used. Mineral fibers (also called mineral wool or rock wool)
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8 high tensile modulus (~60 GPa) , low elongation (3%–4%)
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9 The individual types of fibers can have various structures and cross-sections. Chen and Xu used scanning electron microscopy to investigate the structure of some fibers, including asbestos, lignin (cellulosic)
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10 • The German draindown test involves placing about 1 kg of mixture in a glass beaker after mixing, then covering the beaker with foil and holding it in an oven at the compaction temperature for 60 ± 1 min. Then the beaker is turned over, allowing the mix to fall into a tared bowl.
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11 crawl out of rolling thin film oven bottles during conditioning (Brown et al.
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12 difficult, leading to higher air void contents in laboratory- or field-compacted mixtures (Serin et al. 2012; Crispino et al.
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13 increasing the mixing time (Watson et al. 1998; Cleven 2000)
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14 deformed" with ruts as deep as 2¼ in. Rut depths in the fiber section were all less than 3/8 in.
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15 were encountered in placing this material (Maurer and Malasheskie 1989)
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16 retained samples were reheated and used to compact gyratory specimens for testing in the Superpave shear tester (SST) and the indirect tensile (IDT)
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17 would need to be placed 2 in. thicker than the fiber mix (5.5 vs.
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18 propagation than the fiber mix after both short-term (194 vs. 129 cycles)
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19 with PP alone)
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20 Limited testing showed that fibers did not have a great effect on either the DSR or BBR results of the fine mortar. Cellulose stiffened the mortar slightly, but the rock and slag wools did not.
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21 D4867 modified) , and rut testing (APA)
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22 diameter and 63.5 mm (2.5 in.) tall were tumbled in an LA abrasion drum (without the steel balls)
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23 • Increased resistance to rutting and cracking, • Improved durability, and • Increased toughness and stability. However, documented benefit–cost ratios or costeffectiveness studies are lacking in the literature.
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