A kind of mixing method of factory mixing hot recycled asphalt mixture
A technology of asphalt mixture and old asphalt mixture, which is applied in the field of asphalt concrete, can solve the problems of road surface use function decline, structural disease, land occupation, etc., to reduce voids, improve compressive performance, and improve strength and stability Effect
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Embodiment 1
[0047] A mixing method for factory-mixed hot recycled asphalt mixture, comprising the following steps:
[0048] A1: Mix 5 parts by weight of asphalt with a whetstone ratio of 4% and 1.1 parts of tire reclaimed rubber powder with an average mesh of 100 meshes, and mix at 170°C for 8 minutes to obtain mixture A;
[0049] A2: Add mixture A to 45 parts of old asphalt mixture, and mix at 155°C for 6 minutes to obtain mixture B;
[0050] A3: Preheat 56 parts of limestone aggregates to 175°C, and add 5 parts of limestone powder with an average mesh of 180 meshes to mixture B, and mix at 170°C for 33s to obtain recycled asphalt mixture.
Embodiment 2
[0052] A mixing method for factory-mixed hot recycled asphalt mixture, comprising the following steps:
[0053] A1: Mix 5 parts by weight of asphalt with 1.1 parts of modified rubber powder with an average mesh of 100 meshes, and mix at 170° C. for 8 minutes to obtain mixture A;
[0054] A2: Add mixture A to 45 parts of old asphalt mixture with a whetstone ratio of 4%, and mix at 155°C for 6 minutes to obtain mixture B;
[0055] A3: Preheat 56 parts of limestone aggregate to 175°C, and add 5 parts of limestone ore powder with an average mesh of 180 mesh to mixture B, and mix at 170°C for 33s to obtain recycled asphalt mixture.
[0056] Wherein, the preparation steps of the modified rubber powder are as follows:
[0057] B1: Mix 35 parts by weight of tire reclaimed rubber, 10 parts by weight of talcum powder with an average mesh of 1700 mesh, and 3 parts of glycerin at 120° C. for 11 minutes, and then pulverize to obtain mixture C;
[0058] B2: mix 22 parts of 11wt% sodium hy...
Embodiment 3
[0061] The difference from Example 2 is that the preparation steps of the modified rubber powder are as follows:
[0062] B1: Mix 35 parts by weight of tire reclaimed rubber, 1.2 parts of lignin, and 3 parts of glycerin at 120°C for 11 min, and then pulverize to obtain mixture C;
[0063] B2: mix 22 parts of 11wt% sodium hypochlorite solutions with 60 parts of water, and add 8 parts of polyethylene glycols with a relative molecular mass of 5000, stir to obtain mixed solution D;
[0064] B3: Add mixture C to mixed solution D, ultrasonically stir at 34°C for 9 hours, then filter, wash the solid phase with deionized water, dry and loosen to obtain modified rubber powder.
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