[Retracted] The Application of Nano-Calcium Carbonate in the Technology of Improving Road Petroleum Asphalt

Table 2

The influence of modified asphalt content on the softening point of petroleum asphalt.

(%)	<20 mash	20∼40 mash	40∼60 mash	60∼80 mash	>80 mash
10	51.44	51.3	51.37	51.85	50.77
15	51.56	51.22	53.4	52.17	51.09
20	52.33	51.66	53.44	54.7	54