Finished cementing material for pouring type asphalt mixture and preparation method of finished cementing material

Abstract

The invention discloses a finished cementing material for a pouring type asphalt mixture and a preparation method of the finished cementing material. The finished cementing material is prepared from the following main components: 40 to 80 percent of native bitumen mother solution with needle penetration 5 to 20 (0.1mm), 1 to 8 percent of modifier, 18 to 55 percent of petroleum asphalt and 0.1 to 0.3 percent of stabilizer. The preparation method comprises the following steps: adding the modifier consisting of chlorinated polyethylene rubber and thermoplastic elastomer into the petroleum asphaltwith the temperature of 160 to 180 DEG C; carrying out full swelling and shearing, then mixing the modifier with the native bitumen mother solution at the temperature of 180 to 190 DEG C and then uniformly stirring; finally, adding the stabilizer, developing at the temperature of 170 to 190 DEG C for 2 to 3 hours, thus obtaining the finished cementing material for the pouring type asphalt mixture. The finished cementing material can be stored and transported for a long time and is convenient to use; the finished cementing material is suitable for preparing a high-performance pouring type asphalt mixture.

Description

technical field [0001] The invention relates to the field of road building materials, in particular to a finished cementitious material for pouring asphalt mixture and a preparation method thereof. Background technique [0002] Poured asphalt mixture has become one of the mainstream bridge deck paving methods due to its advantages of good integrity, good water sealing effect, and good follow-up with the bridge deck. For example, poured asphalt mixture is used in the deck pavement of the Hong Kong-Zhuhai-Macao Bridge in my country. [0003] The cementing material of the early pouring asphalt is obtained by mixing lake asphalt with matrix asphalt. For example, Japan uses straight-run asphalt with a penetration of 20-40 (0.1mm), which is modified with 20-30% lake asphalt as cement. material. The early pouring asphalt in Germany used straight-run asphalt with a penetration of 25-50 (0.1mm) mixed with 15-35% lake asphalt. Due to the excellent high temperature performance of la...

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Problems solved by technology

However, there are the following problems in application. On the one hand, lake asphalt modified asphalt has the shortcomings of low temperature ductility and fatigue resistance, so the road surface is prone to fatigue cracks and temperature shrinkage cracks; on the other hand, because lake asphalt contains trichlor Ethylene insolubles, after mixing with petroleum asphalt, these insolubles are very easy to segregate and precipitate, thus affecting the performance of the cementitious material, so the conventional lake asphalt modification can only be modified on-site, that is, the lake asphalt is mixed with As an admixture added to asphalt or mixture, it not only increases the construction process and the difficulty of quality control, but also the uniformity of the material is poor

[0004] The existing compounding technology of natural asphalt and polymer-modified asphalt is to produce the finished polymer-modified asphalt first, and then put the natural asphalt into the modified asphalt on the eve of use. This is mainly because: on the one hand The particle size of trichlorethylene insoluble matter in natural asphalt is too large, making it difficult to pass through the shearing machine; on the other hand, natural asphalt has a high density and is easy to segregate and precipitate from modified asphalt, so the product cannot be stored for a long time under conventional technology. Can be blended with natural asphalt before use

The disadvantage of this addition method is that (1) the addition of natural asphalt is difficult to integrate with the network structure formed by polymer modified asphalt, and may even destroy its original colloidal structure, and the advantages of both cannot be fully utilized; (2) Due to the problem of segregation, the use of natural asphalt is limited; (3) When natural asphalt is used as an admixture, an additional addition process is required, the product cannot be finished, and it is inconvenient to use; (4) Natural asphalt is a natural mineral, There is a certain deviation in the asphalt content and components, and the direct addition of natural asphalt will easily lead to certain quality differences in each batch of finished products

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