Special modified asphalt for cast asphalt concrete, and preparation method thereof

Abstract

The invention provides a special modified asphalt for cast asphalt concrete, and a preparation method thereof. The special modified asphalt comprises 100 parts of asphalt, 2-15 parts of an SBS (styrene-butadiene-styrene) block copolymer, 2-15 parts of hard asphalt and 1-10 parts of a toughening agent. The special modified asphalt for cast asphalt concrete can reach or exceed the softening point ofcommon cast asphalt, so the special modified asphalt has a good high-temperature stability; the special modified asphalt has a better low-temperature anti-cracking performance than common cast modified asphalt; and the special preparation method is adopted, so the modified asphalt of the invention has a very high storage stability, and is not prone to separate and crust at a high temperature.

Description

technical field [0001] The invention relates to the field of road building materials, in particular to a special modified asphalt for pouring asphalt concrete and a preparation method thereof. Background technique [0002] Due to its good integrity, good water sealing effect, and good follow-up with the bridge deck, pouring asphalt binder has become one of the mainstream bridge deck pavement methods, such as the bridge deck pavement of the Hong Kong-Zhuhai-Macao Bridge in my country Poured asphalt binders are used. [0003] At present, the asphalt binders in poured asphalt concrete used in steel bridge deck pavement in my country mainly include the following schemes: low-grade asphalt and natural asphalt compound asphalt, ordinary modified asphalt and natural asphalt compound asphalt, and polymer modified asphalt several types. Among them, the total amount of asphalt used for steel bridge deck pavement is relatively small, and low-grade asphalt is difficult to supply in smal...

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Problems solved by technology

Among them, the total amount of asphalt used for steel bridge deck pavement is relatively small, and low-grade asphalt is difficult to supply in small quantities due to processing technology problems; while natural asphalt is mainly TLA lake asphalt, which is a non-renewable resource and needs to be imported. It is expensive, requires special de-barrel and melting equipment, and the process is complicated, and the segregation problem is difficult to solve, so it needs to be used immediately in on-site production; while high-volume polymer-modified asphalt has high viscosity, and storage stability is also difficult to solve. Prone to polymer accumulation and skinning

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