Fig. 12

15° Diffuse reflection measurements of signal response of 1–6 week aged bitumen for (a) 5776 nm (1731 cm−1), (b) 6092 nm (1641 cm−1) and (c) 6277 nm (1593 cm−1).
15° Diffuse reflection measurements of signal response of 1–6 week aged bitumen for (a) 5776 nm (1731 cm−1), (b) 6092 nm (1641 cm−1) and (c) 6277 nm (1593 cm−1).