The research and application of colored asphalt concrete pavement can be traced back to 1950s, beginning in Europe and America. This kind of pavement can not only better coordinate with the architectural art around the road, but also beautify the city and induce traffic. It can also reflect the characteristics and style of a country and a city, enhance the image and function of the whole city, and show the elegance and charm of a modern city. This discussion began in the early 1980s in China, but it was rarely used on the road. In recent years, as a new paving technology, it is more and more applied to roads, roads or squares to create an atmosphere of the times.

Second, the color asphalt concrete pavement overview

1, the definition of colored asphalt concrete pavement:

The so-called colored asphalt concrete pavement refers to the colored asphalt concrete pavement with certain strength and road performance. At a specific temperature, the decolored asphalt can be mixed with various colored stones, pigments and additives to prepare various colored asphalt mixtures.

2, color asphalt mixture technical indicators:

(1) The main technical indicators of binder (colored asphalt) shall meet the standard of GB 50092-96 heavy traffic asphalt AH-50 (AH-90 can also be used for non-motor vehicle lanes). That is, penetration (25℃): 40 ~ 60, ductility (15℃)80, softening point (ring and ball method): 45~55.

(2) The Marshall stability of fine colored asphalt mixture is 7.5kN, and the flow value is 20~40. The Marshall stability of fine-grained AC 10 color asphalt mixture is 1 1.9kN, and the flow value is 30.

3. The main performance characteristics of color asphalt concrete pavement:

(1) Good road performance. Under different temperatures and external environment, it has good high-temperature stability, water damage resistance and durability, no deformation, asphalt film peeling and other phenomena, and good adhesion with the base.

(2) The color is bright and lasting, does not fade, and is resistant to high temperature of 77℃ and low temperature of -23℃, and is convenient to maintain.

(3) It has a strong sound absorption function. When the automobile tire rolls at high speed on the highway, it will not produce strong noise due to air compression, and at the same time it can absorb other noises from the outside.

(4) Good elasticity and flexibility, good foot feeling, most suitable for the elderly to walk, and anti-skid in winter. In addition, the color mainly comes from the color of stone itself, which will not cause great harm to the surrounding environment.

Three, color asphalt concrete mixing and pavement construction.

1, mixture mixing should pay attention to the following matters different from ordinary asphalt mixture mixing:

(1) Before mixing, the mixing drum, asphalt pipeline, transport vehicles and construction machinery and equipment of the mixing station shall be cleaned.

(2) In order to make the production target mixture ratio as close as possible to the design mixture ratio, the performance of raw materials should be stable.

(3) The impact on the environment should be considered when adding toner, because the toner accounts for a large proportion and has the functions of coloring, dispersing, adsorbing, stabilizing and thickening in the mixture.

(4) The stirring temperature should be controlled at 160℃~ 170℃, and the stirring time is longer than the ordinary time 10s. After discharging, check whether the granular material and color are uniform in time.

2, mixture paving:

First, check whether the subbase is solid, smooth and clean, and at the same time check whether the paving and compaction machinery is in good working condition;

Then, clean the base and spray 0.3-0.5kgm2 emulsified asphalt. Improve the interfacial adhesion and reduce the infiltration of rainwater into the pavement structure;

Then, in strict accordance with the elevation of loose paving, screed is padded with cushion blocks to ensure that the initial paving thickness meets the requirements; Strictly control the working speed of the paver (speed range: 2.0 ~ 2.5 minutes) to ensure continuous paving;

Finally, full width paving, one-time molding, uninterrupted and timely rolling. Achieve uniform color, uniform and beautiful particles.

3. Compaction molding of the mixture:

(1) Selection of pavement machinery: According to the size of the project and the complexity of the construction site, choose the model, power and quantity of road rollers. Tire roller is not desirable because it will pollute and stick to the road surface.

(2) Pressure combination mode: it is also divided into three stages: initial pressure, secondary pressure and final pressure. The initial pressure temperature should be controlled at 130℃~ 145℃, and the final pressure temperature should not be lower than 70℃. The principle of following closely, slowly pressing, high frequency and low amplitude should be followed when rolling.

Firstly, according to the paving results of the test section, the rolling combination mode is determined;

Then, after the pavement is statically pressed 1 pass with a heavy roller, it is lightly vibrated 1 pass, that is, the initial compaction is completed;

Then, the light roller completes the main work of recompression, and determines the rolling times according to the site conditions until compaction;

Finally, when the pavement temperature drops to 80℃, start the final pressure, and use the heavy-duty road roller for static pressure 1-2 times to completely eliminate the wheel tracks.

(3) Details that should be paid attention to during compaction:

(1) The steel wheel should be properly lubricated to avoid material sticking on the roller of the steel wheel. It is suggested to add a proper amount of washing powder (0. 15kgm3) to the water tank of the drum.

(2) Combined compaction by light and heavy rollers. In order to avoid the damage of heavy roller steel wheels to kerbs, the area near kerbs of 15CM is rolled by light roller.

(3) Make sure that the rolling equipment is clean before rolling, so as to prevent the colored asphalt surface from being

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