Road Performance and Microscopic Mechanism Analysis of Modified Straw Fiber Asphalt Binder

Table 1

Physical properties of fibers.

Fiber type	Color	Average length (mm)	pH	Oil absorption rate (multiple)	Thermal weight loss (%)	Ash content (%)
Corn straw fiber	Yellow	3.8	7.06	5.71	7.3	5.4
Modified corn straw fiber	Light yellow	3.8	8.35	7.69	5.6	5.8
Cotton straw fiber	Brown	3.2	6.5	6.3	9.0	4.8
Modified cotton straw fiber	Light brown	3.2	7.97	7.82	5.5	5.2
Lignin fiber	Light gray	<5	8.4	8.13	5.6	18.7
Technical requirements	—	≤6	7.5 ± 1	7 ± 2	≤6	≤23