A micro-repair type release agent for asphalt mixture rolling and preparation method thereof

Abstract

The invention provides a micro-repair type separating agent for grinding of a bituminous mixture. The separating agent is prepared from 10%-15% of waste cooking oil, 6%-8% of carbon black, 15%-20% of emulsified silicone oil, 6%-10% of sodium dodecyl benzene sulfonate, 3%-5% of organic acid, 4%-7% of polyethylene glycol, 2%-4% of mica powder and the balance of water, and the sum of weight percentages of raw materials is 100%. The waste cooking oil, the carbon black and the emulsified silicone oil are mixed, and a mixture A is obtained; the organic acid, polyethylene glycol and the mica powder are mixed, and a uniform mixture B is obtained; the obtained mixture B is added to the mixture A, and a uniform mixture C is obtained through mixing; sodium dodecyl benzene sulfonate and the water are mixed to form a dilute solution, then the dilute solution is added to the mixture C at 60-70 DEG C, and the micro-repair type separating agent is obtained. Communicating gap and whitening phenomena of a bituminous layer surface can be avoided, the separating agent plays a micro-repair role on a bituminous pavement, and the water stability, ageing resistance and fatigue cracking resistance of the bituminous pavement can be effectively improved.

Description

technical field [0001] The invention belongs to the field of road engineering and relates to a release agent, in particular to a micro-repair type release agent used for asphalt mixture rolling and a preparation method thereof. Background technique [0002] Due to the advantages of good driving comfort, convenient maintenance, and good adhesion to tires, asphalt pavement has developed into the main structural type of high-grade highways in my country. During the construction of asphalt mixture, its rolling operation will directly affect the compaction performance of asphalt pavement, not only related to the smoothness of asphalt pavement, but also restricts its durability. During the rolling process, no matter steel wheel rollers or rubber wheel rollers are used, hot mix asphalt mixtures, especially modified asphalt mixtures such as SBS and SBR, will stick to the rolling equipment very seriously, seriously affecting the rolling equipment. Pressure effect and pavement engine...

AI Technical Summary

Problems solved by technology

During the construction of asphalt mixture, its rolling operation will directly affect the compaction performance of the asphalt pavement, which not only affects the smoothness of the asphalt pavement, but also restricts its durability.

During the rolling process, no matter steel wheel rollers or rubber wheel rollers are used, hot mix asphalt mixtures, especially modified asphalt mixtures such as SBS and SBR, will stick to the rolling equipment very seriously, seriously affecting the rolling equipment. Pressure effect and pavement engineering quality

[0003] At present, domestic construction units usually use vegetable oil, diesel oil, etc. as release agents during the rolling construction of asphalt mixtures. However, such release agents have a significant dissolution effect on asphalt, which is likely to cause insufficient compaction, and interconnected voids appear on the surface of the asphalt layer. , the asphalt film dissolves and peels off, the aggregate on the surface of the asphalt layer is exposed, and the pavement is whitened, resulting in peeling of the asphalt pavement and early water damage.

In addition, the flammability of diesel oil increases the fire hazard during construction, and the plasticizing effect of vegetable oil and diesel oil will greatly reduce the softening point of asphalt, which will affect the high temperature stability and other properties of asphalt mixture, thereby affecting the durability of asphalt pavement sex

At the same time, some construction units adopt the method of water spraying and anti-sticking. Although this measure is simple, it greatly reduces the rolling temperature of asphalt mixture, and the residual moisture inside the asphalt mixture will further affect its rolling compactness.

[0004] On the other hand, during the rolling process of the road roller, the repeated rubbing and extrusion of mechanical equipment will cause damage to the asphalt film on the surface of the asphalt mixture, which will deteriorate the encapsulation of the aggregate and leave a breakthrough for the entry of water. cause water damage

In addition, the weak point of fatigue damage will be formed under the repeated action of vehicle load, which further affects the durability of asphalt pavement

[0005] At present, the annual output of food waste oil (gutter oil) in my country is as high as 2600×10 4 t. It has a wide range of influence and is extremely difficult to identify. If it is not used rationally, it will pollute the environment if it is directly discharged. It will be processed into "edible oil" by criminals and then enter the market and return to the dining table, which is extremely harmful to the human body.

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