Composite asphalt modifier, composite modified asphalt and production process of composite asphalt modifier and composite modified asphalt

Abstract

The invention discloses a composite asphalt modifier, composite modified asphalt and a production process of the composite asphalt modifier and the composite modified asphalt. The composite asphalt modifier is prepared from the following components in parts by weight: 29-30 parts of asphalt a, 35-42 parts of SBS, 9-11 parts of activated rubber powder and 20-24 parts of rubber oil slurry, wherein the rubber powder is centralized in stress when being stressed in an asphalt base body. The production process of the composite modified asphalt comprises the following steps: adding 16.0-20.4 parts of composite asphalt modifier into 79.6-84.0 parts of the asphalt a at 180-190 DEG C to circularly glue or shear once to prepare modified masterbatch; dilution for the first time: adding 32.90-36.88 parts of asphalt a at 140-160 DEG C, 0.13-0.27 part of additive and 0.27-0.37 part of stabilizer into 62.5-66.7 parts of modified masterbatch, and fully stirring and developing for 2-3 hours to prepare mixed asphalt; dilution for the second time: adding 20-25 parts of composite asphalt at 130-150 DEG C into 75-80 parts of mixed asphalt, and stirring and developing for 0.5-1 hour to obtain the composite modified asphalt. The composite modified asphalt has weather resistance, good adhesion and low cost, and performance indexes accord with the I-D standard of polymer modified asphalt.

Description

technical field [0001] The invention relates to the technical field of modified asphalt, in particular to a composite asphalt modifier, a composite modified asphalt and a production process thereof. Background technique [0002] SBS / rubber powder composite modified asphalt is a method of using SBS and rubber powder as two polymer modifiers for asphalt modification at the same time. SBS is a block copolymer of styrene and butadiene. The physical crosslinking of styrene segment can improve the high temperature permanent deformation resistance of asphalt, while the butadiene segment endows asphalt with certain flexibility. This special structure makes SBS modified asphalt have good high and low temperature performance. Higher parameters of SBS modified asphalt pavement can greatly improve the performance of base asphalt, but SBS is expensive. If the cost is controlled and the parameters are reduced, the low-temperature brittleness will be relatively large, and the anti-aging a...

AI Technical Summary

Problems solved by technology

The softening point and ductility of this ordinary waste rubber powder modified asphalt are low, so adding modifiers such as SBS and various additives to compound modified asphalt in the waste rubber powder makes the softening point and ductility of the asphalt greatly improved. Improvement: There are many patents for compound modified asphalt related to rubber powder / SBS at home and abroad, such as CN102181163 A with a rubber powder content of 15-25%, CN 101555355 B with a rubber powder content greater than>50%, and CN 101985524 A The rubber powder content of CN 103059591 A is 35%, the rubber powder content of CN 103059591 A is 10-15%, the rubber powder content of CN 101717586 A is 30-50%, and the rubber powder content of CN 102993757 A is 20-60%. The performance index of composite modified asphalt with high powder parameter as the main factor and SBS low parameter as supplement is closer to the performance index of rubber asphalt, which is far from the performance index of polymer modified asphalt I-D, and due to the compatibility of asphalt and rubber powder Not good, prone to sinking, poor storage stability

And the rubber powder content of CN1609165 is 1~6%, the composite modified asphalt of this low rubber powder parameter, only the preparation and stability of rubber powder composite modified asphalt have been studied, solved the problem of storage stability, but The performance index of rubber powder compound modified asphalt has not been studied, and its performance index cannot reach the performance index of polymer modified asphalt I-D

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