A Proportion Design Method for SMA Mixture
A design method and mixture technology, applied in the field of road and bridge engineering, can solve the problems of unstable quality of SMA mixture, hindering the large-scale application of SMA, and uneven fiber quality, so as to simplify the mixing production process and reduce asphalt smoke. Emissions, reducing the effect of short-term aging
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Embodiment 1
[0040] The embodiment of the present invention provides a method for designing the ratio of SMA mixture, comprising the following steps:
[0041] Step 1: adjust the proportion of mineral material, and select 3 preliminary test gradations with different thicknesses from the primary selection gradation range in Table 1, and the preliminary test gradation is as shown in Table 2;
[0042] Table 1 Primary grading range
[0043]
[0044] Table 2 Primary gradation
[0045] Sieve hole(mm)
16
13.2
9.5
4.75
2.36
1.18
0.6
0.3
0.15
0.075
1# Grading
100
89.7
63.9
30.3
24.1
20.3
14.5
13.2
11.9
11.4
2# Grading
100
90
64.7
28.7
22.3
19.1
14
12.9
11.7
11.2
3# Grading
100
90.8
67.3
26.5
19.7
17.2
13.2
12.4
11.5
11.1
[0046] Step 2: Calculate the theoretical minimum asphalt ratio according to the following formula with the target void rat...
Embodiment 2
[0059] The embodiment of the present invention provides a kind of SMA mixture, comprises: the SBS modified asphalt (I-D) of 1 weight part, the aggregate of 16.07 weight parts, the limestone mineral powder of 1.79 weight part (asphalt ratio=SBS modified asphalt / (set material+limestone slag)=5.6%) and 0.005 parts by weight of Evotherm M1 surfactant; wherein the aggregate is taken from the basalt produced in Chengde, Hebei, and the gradation is shown in Table 4.
[0060] The SMA mixture is prepared by the following method: Step 1: take a certain amount of SBS modified asphalt, take by weighing 0.5% surfactant with the weighed amount of the SBS modified asphalt (I-D) and add to the Stir in the SBS modified asphalt for 5 minutes, and then place it in an oven at 165°C for drying for later use; Step 2: Take the aggregate that is 16.07 times the weighted amount of the SBS modified asphalt described in step 1 and dry it at 155°C Keep the temperature in the dry box for 4 hours, then add...
Embodiment 3
[0064] The embodiment of the present invention provides a kind of SMA mixture, comprises: the SBS modified bitumen (I-D) of 1 weight part, the aggregate of 16.43 parts by weight, the limestone mineral powder of 1.43 parts by weight (asphalt ratio=SBS modified bitumen / (set Material+limestone ore powder)=5.6%) and the Evotherm M1 surfactant of 0.006 weight part;
[0065] The SMA mixture is prepared by the following method: Step 1: take a certain amount of SBS modified asphalt, take by weighing 0.6% surfactant with the weighed amount of the SBS modified asphalt (I-D) and add it to the Stir in the SBS modified asphalt for 10 minutes, and then place it in an oven at 155°C for drying for later use; Step 2: Take the aggregate that is 16.43 times the weighted amount of the SBS modified asphalt described in step 1 and dry it at 145°C Keep the temperature in the dry box for 4 hours, then add it to the mixing pot at 145°C and dry mix it for 90s; Step 3: Add the asphalt prepared at consta...
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