Determination of Gradation of Recycled Mixed Coarse Aggregates for Pavement Base or Subbase by Crushing Fractals
Table 2
Statistical table of crushing and screening of recycled mixed aggregates.
Particle diameter (mm)
Group of aggregates
RB
RC2RB8
RC4RB6
RC5RB5
RC6RB4
RC8RB2
RC
NL26.5
Total mass (g)
RB + RC
1563.28
1645.49
1768.09
1867.24
1938.16
2062.14
2156.85
2551.85
19 mm–26.5 mm mass (g)
RC
329.1
707.24
933.62
1162.9
1649.71
2156.85
2551.85
RB
1563.28
1316.39
1060.85
933.62
775.26
412.43
19 mm–26.5 mm mass (g)
RC
94.2
117.72
167.33
205.61
256.08
171.86
179.6
RB
75.07
32.11
21.77
17.12
0
3.49
16 mm–19 mm mass (g)
RC
86.44
126.27
133.93
148.83
158.2
207.82
297.5
RB
87.61
72.75
36.47
41.25
21.91
8.64
13.2 mm–16 mm mass (g)
RC
21
73.38
116.82
131.57
164.13
206.31
269
RB
92.27
66.01
41.59
39.3
25.66
10.74
9.5 mm–13.2 mm mass (g)
RC
30
114.32
129.95
157.63
218.53
282.83
410
RB
151.5
105.56
84.64
68.64
51.06
28.56
4.75 mm–9.5 mm mass (g)
RC
59.2
122.7
165.36
225.16
312.09
472.8
535
RB
275.76
226.04
182.4
141.09
137.36
56.99
<4.75 mm
RB + RC
881.07
852.18
846.83
846.43
833.37
844.68
815.24
860.75
Mass of coarse aggregates (g)
RB
682.21
502.47
366.88
307.41
235.99
108.42
RC
290.84
554.38
713.39
868.8
1109.03
1341.62
1691.1
Mass of fine aggregates (g)
RB + RC
881.07
852.18
846.83
846.43
833.37
844.68
815.24
860.75
Ratio of recycled clay brick (%)
RB
100
63.3
39.8
30.1
21.4
8.9
Loss rate of recycled clay brick in crushed coarse aggregates (%)
RB
56.36
61.83
65.42
67.07
69.56
73.71
Ratio of recycled concrete (%)
RC
36.7
60.2
69.9
78.6
91.1
100
100
Loss rate of recycled concrete in crushed coarse aggregates (%)
RC
11.6
21.6
23.6
25.3
32.8
37.8
33.7
Coarse aggregate content (%)
RB + RC
43.6
48.2
52.1
54.7
57
59
62.2
66.3
Fine aggregate content (%)
RB + RC
56.4
51.8
47.9
45.3
43
41
37.8
33.7
Fractal dimension (D)
2.656
2.614
2.561
2.529
2.502
2.475
2.416
2.338
Correlation coefficient (R2)
0.995
0.995
0.994
0.995
0.996
0.998
0.985
0.983
Note: the mass of mixed aggregate before crushing; ratio of recycled clay bricks (%) = the mass of recycled clay bricks in crushed coarse aggregates/the mass of crushed coarse aggregates; ratio of recycled concrete (%) = the mass of recycled concrete in crushed coarse aggregates/the mass of crushed coarse aggregates; loss rate of recycled clay brick coarse aggregates (%) = (the mass of recycled clay bricks before pressurizing−the mass of recycled clay bricks in crushed coarse aggregates)/(the mass of recycled clay bricks before pressurizing) (%); loss rate of recycled concrete coarse aggregates (%) = (the mass of recycled concrete before pressurizing−the mass of recycled concrete in coarse aggregates)/(the mass of recycled concrete before pressurizing) (%); coarse aggregate content (%) = the mass of crushed coarse aggregates/the total mass of aggregates before pressurizing; fine aggregates content (%) = the mass of crushed fine aggregates/the total mass of aggregates before pressurizing.
