Waste rubber powder modified asphalt composition for increasing storage stability and preparation method thereof

[0020] Example 1

[0021] 400 grams of basic asphalt with a penetration degree (25°C, 0.1mm) of 94, first heated to 160°C to melt; add 13% of treated 80-mesh rubber powder (with a liquid additive that accounts for 5% by weight of the rubber powder [Zibo Qi] The 1502 latex produced by Xiang Industry and Trade Co., Ltd.] sprayed and wrapped the rubber powder, dried at 80°C for 1 hour.) and 0.15% sulfur crosslinking agent, sheared at 180°C for 90 minutes. Compared with the modified asphalt without rubber powder pretreatment, the stability of the modified asphalt modified with rubber powder is obviously improved, and the difference between the upper and lower softening points of the segregation test changes from -5.5°C to -0.5°C, fully reaching The technical requirements for the storage stability of SBS modified asphalt.

[0022] Example 2

[0023] The difference between this example and Example 1 is that 2% of SBS polymer is added, and the prepared rubber powder-modified asphalt not only has qualified storage stability, but also other properties can fully meet the requirements of the Ministry of Communications. The JTG F40-2004 polymer modified asphalt I-C technical index requirements. Penetration of the modified asphalt (25°C, 0.1mm) 73, softening point: 55.0°C, ductility at 5°C: 31cm, difference between upper and lower softening points after storage: -0.5°C, needle ratio after TFOT: 80%, after TFOT 5°C ductility: 22cm.

[0024] Example 3

[0025] 400 grams of basic asphalt with a penetration degree (25°C, 0.1mm) of 90, first heated and melted; add 15% of treated 120-mesh rubber powder (with a liquid additive [polybutadiene latex that accounts for 20% by weight of the rubber powder]) , Zibo Yuming Industrial Co., Ltd.] sprayed and wrapped the rubber powder, dried at 100 ° C for 40 minutes.), sheared at 190 ° C for 90 minutes, and then added 1.5% SBS, 1.0% SBR and 0.2% bismuth Sulfur tetramethylthiuram and continue shearing for an additional 60 minutes. The modified asphalt has a penetration (25°C, 0.1mm) of 70, softening point: 58.5°C, ductility at 5°C: 35cm, and difference between upper and lower softening points after storage: -1.0°C.