TWI721560B - One-stage mixing method for preparing normal temperature asphalt concrete - Google Patents

Abstract

A one-stage mixing method for preparing normal temperature asphalt concrete includes a preliminary step, a mixing step, and a mixing step. The preliminary step is to premix a dried pellet in a mixing chamber. In the mixing step, an asphalt mixture is added to the mixing bin, and the asphalt mixture includes an asphalt mortar and a petroleum solvent. Wherein, the petroleum solvent is one or a combination selected from diesel and kerosene. The mixing step is to continue mixing in the mixing chamber at a temperature of 135 to 163°C. With this petroleum solvent, the asphalt mixture has fluidity at about 80°C, which facilitates mixing with the pellets. Not only does it require one-stage mixing to complete the process, the asphalt mortar is more stored than originally needed. High temperature conditions can also greatly reduce energy consumption.

Description

One-stage mixing method for preparing normal temperature asphalt concrete

The invention relates to a method for preparing engineering materials, in particular to a method for preparing normal temperature asphalt concrete by one-stage mixing.

Asphalt pavement is currently the most commonly used type of road paving. Because it is widely used and has a large area, it is facing the problem of maintaining a huge road maintenance area. How to achieve maintenance and repair in consideration of factors such as materials, costs, timeliness, etc. The maximum benefit of the pavement is the main problem for those involved in the related fields. Among them, although the traditional hot-mix asphalt concrete has better repair effects, it is usually repaired by milling and resurfacing during construction. Not only is the project time-consuming and easily affects normal transportation, but also the mobilization of machinery and tools is also costly. A large amount of manpower and material resources, coupled with the construction process will produce a large amount of asphalt removal waste, and there will also be dust, waste gas and environmental protection, which is not a completely ideal treatment method.

In addition to hot-mix asphalt concrete, there is another oil-soluble asphalt mixed with asphalt mortar and petrochemical solvent. It does not need to be mixed at high temperature and can be used at room temperature. When it is laid on the site to be repaired, the petrochemical solvent will gradually volatilize, and the remaining asphalt mortar will form a bonding effect, which can be combined with the existing asphalt on the surrounding road surface to achieve the purpose of repair. However, although oil-soluble asphalt is suitable for packaging in bags for small-scale road repairs, and has the convenience of being used at room temperature, there is currently no detailed specification for this room temperature asphalt concrete, so during the preparation process, for example, the addition of solvents Compared with the mature technology of hot-mix asphalt, there is no public information to follow. Therefore, not only the quality may vary due to the difference in the selected solvents. , During preparation, it may also cause unnecessary energy consumption or solvent usage due to unoptimized manufacturing process.

Chinese Mainland Publication No. CN1478821 Invention Patent discloses a normal temperature repair material for asphalt pavement and its preparation method. After the asphalt mixture is produced, 0.5-1% of the asphalt mixture is mixed with a viscosity-retaining agent when the temperature drops to 60~120℃. When it is cooled to 60~80℃, add 0.5~0.8% retarder of asphalt mixture and re-mix to make the product. That is to say, it uses at least two-stage mixing to actually make normal temperature concrete products, especially when adding a tack-preserving agent, it is added after mixing the asphalt mortar and pellets. Due to the basic characteristics of the tack-preserving agent, It is easy to cause uneven mixing, or it is possible to increase the mixing uniformity and extend the mixing time at the same time, which will increase the amount of adhesion-preserving agent, and cause excess harmful substances in the solvent to be excessively volatilized during the mixing process. Shortcomings.

Therefore, the purpose of the present invention is to provide a relatively optimized one-stage mixing method for preparing normal temperature asphalt concrete without performing multi-stage mixing.

Therefore, the method for preparing normal temperature asphalt concrete by mixing in one stage of the present invention includes the following steps:

A preliminary step, premixing a dried pellet in a mixing chamber;

In a mixing step, an asphalt mixture is added to the mixing chamber, and the asphalt mixture includes an asphalt mortar and a petroleum solvent. Wherein, the petroleum solvent is selected from one or a combination of diesel and kerosene; and

In a mixing step, continue mixing in the mixing chamber at a temperature of 135 to 163°C.

The effect of the present invention is that when the petroleum solvent is properly selected, it can be mixed with the asphalt mortar to make the asphalt mixture fluid at relatively low temperature. In addition to being easy to mix, due to the selected diesel or The partial pressure of kerosene is low, and the gas at relatively low temperature volatilizes slowly. There is no need to use too much of the petroleum solvent, which not only reduces the volatilization of harmful substances, but also requires only one stage of mixing to complete the normal temperature asphalt concrete. The manufacturing process has the advantages of lower energy consumption, low pollution, and low cost compared with traditional manufacturing processes.

Referring to FIG. 1, it is an embodiment of the method for preparing normal temperature asphalt concrete by one-stage mixing of the present invention. The embodiment includes a preliminary step 101, a mixing step 102, and a mixing step 103 in sequence.

The preparatory step 101 is to pre-mix a dried pellet in a mixing bin, and the pellet is selected from 6-point stone, three-point stone, two-point stone, sand stone, or any combination thereof. Wherein, the mixing chamber is essentially a specific space provided with a stirring device. Preferably, the weight percentages in the pellets are 10%, 70%, and 20% for three-point stone, two-point stone, and sand, respectively. In order to mix the pellets uniformly, it is preferable to dry mix for 10-15 seconds without adding any mixture. Of course, if the pellets are relatively large, the dry mixing time can be adjusted based on the principle of uniform mixing.

In the mixing step 102, an asphalt mixture is added to the mixing chamber, and the asphalt mixture includes an asphalt mortar and a petroleum solvent. In terms of weight percentage, the preferred weight percentage of the pellets is 95%, and the asphalt mixture is 5%. Wherein, the viscosity of the asphalt mortar can be selected from commonly used AC-10 products, and the petroleum solvent is one or a combination selected from diesel oil and kerosene, and is calculated by weight percentage, preferably the asphalt mortar The weight percentage with the petroleum solvent is 80% and 20% respectively, and the ratio of diesel to kerosene is 10% and 10%, that is to say, in the petroleum solvent, the ratio of diesel to kerosene is 1 :1. It should be particularly noted that the ratio of diesel to kerosene can be adjusted according to different climate and temperature conditions, so as to control the hardening speed of asphalt concrete during subsequent construction.

The mixing step 103 is to continue mixing the pellets and the asphalt mixture in the mixing chamber at a temperature of 135 to 163° C. for 30 to 50 seconds. Similarly, if the pellets and the asphalt mixture are relatively large, the mixing time can be appropriately adjusted based on the principle of uniform mixing and full reaction.

In this embodiment, starting from the dry mixing of the pellets in advance, until the asphalt mixture is added to continue mixing, essentially only one-stage mixing is required, which is compared with the need to add more than two solvents. In terms of the manufacturing process, the mixing time is greatly shortened, and therefore the volatilization of harmful substances generated by the mixing action can be reduced. In addition, the use of the petroleum solvent not only has the effect of reducing the volatilization of harmful substances due to the low partial pressure, but also has the effect of reducing the volatilization of harmful substances at a relatively low temperature of about 80°C. Even if the asphalt mixture has fluidity, it is also beneficial to reduce the energy required to maintain the storage temperature. For storage, transportation and construction.

In summary, the method for preparing normal temperature asphalt concrete by one-stage mixing of the present invention only needs to perform one-stage mixing to complete the process. By optimizing the process of solvent selection and temperature control, the volatilization of harmful substances can also be reduced. It makes storage, transportation, and construction more convenient, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

101: Preliminary steps

102: mixing steps

103: Mixing step

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Fig. 1 is a block flow diagram illustrating an embodiment of the method for preparing normal temperature asphalt concrete by one-stage mixing according to the present invention.

101: Preliminary steps

102: mixing steps

103: Mixing step

Claims (7)

A one-stage mixing method for preparing normal temperature asphalt concrete, comprising: a preliminary step, premixing a dried pellet in a mixing chamber; a mixing step, adding an asphalt mixture to the mixing chamber, the The asphalt mixture includes a bituminous mortar and a petroleum solvent. In terms of weight percentage, the petroleum solvent includes 33.3~67.7% diesel and 33.3~67.7% kerosene; and a mixing step at 135~163 Continue mixing in the mixing chamber at a temperature of ℃. The method for preparing normal temperature asphalt concrete by one-stage mixing according to claim 1, wherein, in the preliminary step, the pellets are selected from 6-point stone, 3-point stone, 2-point stone, sand stone, or any of them combination. The one-stage mixing method for preparing normal temperature asphalt concrete as described in claim 1, wherein, in the preliminary step, the pellets are dry mixed for 10-15 seconds. The method for preparing normal temperature asphalt concrete by one-stage mixing as described in claim 1, wherein, in the mixing step, in terms of weight percentage, the aggregate is 93-95%, and the asphalt mixture is 5-7% . The method for preparing normal temperature asphalt concrete by one-stage mixing as described in claim 1, wherein, in the mixing step, in terms of weight percentage, the asphalt cement of the asphalt mixture is 70-80%, and the petroleum solvent is 20%. ~30%. The method for preparing normal temperature asphalt concrete by one-stage mixing according to claim 1, wherein, in the mixing step, the viscosity of the asphalt cement is AC-10 or AC-20. The method for preparing normal temperature asphalt concrete by one-stage mixing as described in claim 1, Wherein, in the mixing step, the pellets and the asphalt mixture are wet mixed for 30-50 seconds.

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