A BP Neural Network Method for Grade Classification of Loose Damage in Semirigid Pavement Bases

Table 4

Test results.

Sample number	Actual category	Judgment category	True/false	Air voids
1	I	I	True	<6%
2	I	I	True	<6%
3	I	I	True	<6%
4	I	I	True	<6%
5	I	I	True	<6%
6	II	II	True	6%–12%
7	II	II	True	6%–12%
8	II	II	True	6%–12%
9	II	II	True	6%–12%
10	II	III	False	12%–18%
11	III	III	True	12%–18%
12	III	III	True	12%–18%
13	III	III	True	12%–18%
14	III	III	True	12%–18%
15	III	III	True	12%–18%
16	IV	IV	True	18%–24%
17	IV	IV	True	18%–24%
18	IV	III	False	12%–18%
19	IV	IV	True	18%–24%
20	IV	IV	True	18%–24%
21	V	V	True	>24%
22	V	V	True	>24%
23	V	V	True	>24%
24	V	V	True	>24%
25	V	IV	False	18%–24%