Cold-mixed and cold-laid colored asphalt mixture as well as preparation method and application thereof

Abstract

The invention discloses a cold-mixed and cold-laid colored asphalt mixture. The cold-mixed and cold-laid colored asphalt mixture is a skeleton dense type asphalt mixture; the cold-mixed and cold-laid colored asphalt mixture is prepared from the following components in percentage by mass: 10 to 13 percent of light-colored high-viscosity modified emulsified asphalt, 45 to 54 percent of first light-colored coarse aggregate of 5 to 8 mm, 18 to 23 percent of second light-colored coarse aggregate of 3 to 5 mm, 13 to 27 percent of light-colored fine aggregate of 0 to 3 mm, 2 to 4 percent of toner and 1 to 2 percent of cement, the softening point of the light-color high-viscosity modified emulsified asphalt is greater than 80 DEG C, the dynamic viscosity at 60 DEG C is greater than 30000 Pa.s, and the elastic recovery at 25 DEG C is greater than 92%. The cold-mixed and cold-laid colored asphalt mixture provided by the invention is relatively high in strength, high-temperature stability and low-temperature crack resistance, and the technical problems of relatively poor pavement performance and color durability of a colored asphalt pavement formed by laying the existing cold-mixed and cold-laid colored asphalt mixture are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering, and in particular to a cold-mixed and cold-paved colored asphalt mixture and a preparation method and application thereof. Background Art

[0002] Colored asphalt mixture refers to a road material with specific color, strength and usage function formed by mixing light-colored modified asphalt (mainly made of polymers, resins, softeners and other additives, with mechanical and rheological properties similar to ordinary road petroleum asphalt), aggregates, pigments and additives. The colored asphalt pavement formed by paving and rolling the colored asphalt mixture not only has a traffic function, but also plays multiple roles such as beautifying the urban environment, relieving driving fatigue and improving driving safety.

[0003] However, traditional colored asphalt mixtures mainly rely on hot-mix hot-paving technology. Although this technology can ensure the uniformity and structural strength of the mixture, it is accompanied by high energy consumption and environmental pollution, which is contrary to the green and low-carbon development concept currently advocated by the world. During the hot-mix process, aggregates and asphalt need to be heated to a high temperature, which not only consumes a lot of energy, but also emits harmful gases, causing adverse effects on the environment.

[0004] To solve this problem, cold mix cold paving asphalt pavement technology came into being, which is regarded as a major innovation in the field of road construction. Based on the characteristics of cold mix asphalt raw materials, this technology realizes production and construction under normal temperature conditions, significantly reducing the energy consumption in the heating process of aggregates and asphalt, thereby achieving low energy consumption, low emissions and light pollution in road construction. Its advantages are accepted by the public and road workers.

[0005] Nevertheless, the existing cold-mixed and cold-laid colored asphalt mixtures have the following defects: (1) The technical indicators of the used colored modified asphalt are backward, which makes the road surface easy to age and the oil film easy to fall off, thus causing the road surface to fade, and it is difficult to meet the road surface requirements of places with high requirements for road performance and color durability; (2) Compared with ordinary modified asphalt, the color modified asphalt is weaker in strength due to reasons such as the selection of raw materials, resulting in the colored asphalt pavement formed after paving being prone to pavement diseases such as peeling and shifting, which seriously affects the pavement performance. Summary of the invention

[0006] One of the purposes of the present invention is to propose a cold-mixed and cold-laid colored asphalt mixture, which has high strength, high-temperature stability and low-temperature crack resistance, and effectively solves the technical problems of poor road performance and color durability of the existing colored asphalt pavement paved with cold-mixed and cold-laid colored asphalt mixture.

[0007] The second purpose of the present invention is to provide a method for preparing a cold-mixed and cold-laid colored asphalt mixture. The preparation method is simple and easy to operate, which is conducive to ensuring the road performance and color durability of the colored asphalt mixture.

[0008] The third purpose of the present invention is to provide an application of a cold-mixed and cold-laid colored asphalt mixture, which is used to pave colored asphalt pavement to improve the road performance and color durability of the colored asphalt pavement.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] A cold-mixed and cold-laid colored asphalt mixture, wherein the cold-mixed and cold-laid colored asphalt mixture is a skeleton-compacted asphalt mixture;

[0011] Calculated by mass percentage, the cold-mixed cold-laid colored asphalt mixture includes 10-13% of light-colored high-viscosity modified emulsified asphalt, 45-54% of first light-colored coarse aggregate of 5-8 mm, 18-23% of second light-colored coarse aggregate of 3-5 mm, 13-27% of light-colored fine aggregate of 0-3 mm, 2-4% of color powder and 1-2% of cement;

[0012] The light-colored high-viscosity modified emulsified asphalt has a softening point of >80°C, a dynamic viscosity of >30,000 Pa·s at 60°C, and an elastic recovery of >92% at 25°C.

[0013] Furthermore, calculated as a percentage by mass, the solid content of the evaporation residue of the light-colored high-viscosity modified emulsified asphalt is 55-65%.

[0014] Furthermore, calculated by mass percentage, the light-colored high-viscosity modified emulsified asphalt includes 60-62% of light-colored high-viscosity modified asphalt, 34-36.5% of water, 1.8-2.5% of fast-cracking and fast-setting emulsifier, and 0.5-1% of hydrochloric acid;

[0015] Calculated by mass percentage, the light-colored high-viscosity modified asphalt includes 5-8% C5 petroleum resin, 30-45% C9 petroleum resin, 7-13% star-shaped SBS modifier and 40-50% solvent oil;

[0016] The molecular weight of the star-shaped SBS modifier is greater than 300,000.

[0017] Furthermore, calculated according to the mass percentage, the grading of the cold-mixed and cold-laid colored asphalt mixture is: the 9.5mm sieve hole pass rate is 100%, the 4.75mm sieve hole pass rate is 35-75%, the 2.36mm sieve hole pass rate is 15-35%, the 1.18mm sieve hole pass rate is 8-25%, the 0.6mm sieve hole pass rate is 6-20%, the 0.3mm sieve hole pass rate is 5-15%, the 0.015mm sieve hole pass rate is 4-12% and the 0.075mm sieve hole pass rate is 4-10%.

[0018] Furthermore, the first light-colored coarse aggregate and the second light-colored coarse aggregate are both crushed stone, and the light-colored fine aggregate is machine-made sand.

[0019] Furthermore, the crushed stone is any one of limestone and granite;

[0020] The crushing value of the crushed stone is ≤18%, the abrasion value is ≤20%, and the apparent relative density is ≥2.6g / cm 3 , water absorption ≤1%, firmness ≤8%, and adhesion with the light-colored high-viscosity modified emulsified asphalt ≥ level 5.

[0021] Furthermore, the machine-made sand is any one of quartz sand and dolomite;

[0022] The apparent relative density of the machine-made sand is ≥2.5g / cm 3 , firmness ≤12%, sand equivalent ≥65%.

[0023] A method for preparing a cold-mix cold-laid colored asphalt mixture, used for preparing the above-mentioned cold-mix cold-laid colored asphalt mixture, comprises the following steps:

[0024] A. Mixing the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate in a formula amount to obtain a first mixture;

[0025] B. Adding a formulated amount of light-colored high-viscosity modified emulsified asphalt into the first mixture and stirring to obtain a second mixture;

[0026] C. Adding a formulated amount of color powder into the second mixed material and stirring to obtain a third mixed material;

[0027] D. Add the formulated amount of cement into the third mixture and stir to obtain a cold-mixed and cold-laid colored asphalt mixture.

[0028] Furthermore, the stirring time of step A is 10 to 12 seconds; and the total stirring time of steps B, C and D is not less than 1.2 minutes.

[0029] The invention discloses an application of a cold-mixed and cold-laid colored asphalt mixture in a colored asphalt pavement, wherein the laying thickness of the cold-mixed and cold-laid colored asphalt mixture is 1.2 to 2.0 cm.

[0030] The technical solution provided by the present invention may include the following beneficial effects:

[0031] 1. In order to ensure that cold-mixed and cold-laid colored asphalt mixtures can be constructed at room temperature while maintaining their excellent road performance and color durability, this technical solution specifically defines the three key performance indicators of light-colored high-viscosity modified emulsified asphalt: softening point, 60°C dynamic viscosity, and 25°C elastic recovery. Compared with the light-colored high-viscosity modified emulsified asphalt commonly used in the prior art, the light-colored high-viscosity modified emulsified asphalt used in this technical solution has achieved significant improvements in the above three performance indicators. The above-mentioned improvements not only enable the light-colored high-viscosity modified emulsified asphalt to more effectively bond with various light-colored aggregates (including the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate), thereby ensuring the strength of the cold-mixed and cold-laid colored asphalt mixture, avoiding pavement diseases such as peeling and shifting and fading caused by insufficient strength, and ensuring the road performance and color durability of the colored asphalt pavement such as anti-cracking and anti-rutting; moreover, it also gives the cold-mixed and cold-laid colored asphalt mixture a higher high-temperature stability and low-temperature crack resistance, effectively preventing the fading problem of the colored pavement due to aging and oil film shedding, further ensuring the road performance and color durability of the colored asphalt pavement, and meeting the needs of actual road construction.

[0032] 2. This technical solution adds cement as a curing agent to the cold-mixed cold-laid colored asphalt mixture to consume the moisture in the colored asphalt mixture, thereby improving the early strength of the asphalt mixture. At the same time, the addition of cement can also accelerate the consumption of moisture in the colored asphalt mixture, thereby increasing the speed of early strength formation. The above two effects are conducive to improving the strength of the cold-mixed cold-laid colored asphalt mixture, thereby improving the road performance and color durability of the cold-mixed cold-laid colored asphalt mixture. In addition, the improvement of early strength and its formation speed are also conducive to breaking through the limitations of the use of traditional cold-mixed cold-laid colored asphalt mixtures, shortening the time to open the colored asphalt pavement, and realizing the early opening of the colored asphalt pavement.

[0033] 3. In order to ensure the performance of cold-mixed and cold-laid colored asphalt mixture, this technical solution adopts 5-8mm first light-colored coarse aggregate and 3-5mm second light-colored coarse aggregate as coarse aggregate, and a high-content coarse aggregate and low-content fine aggregate ratio design to make the cold-mixed and cold-laid colored asphalt mixture form a skeleton-dense asphalt mixture. In the above asphalt mixture, the skeleton structure is formed by the coarse aggregate, and the gaps between the coarse aggregates are fully filled to form a higher density, so that it has high strength, high-temperature stability and low-temperature crack resistance, thereby ensuring the road performance and color durability of the cold-mixed and cold-laid colored asphalt mixture. DETAILED DESCRIPTION

[0034] The technical solution provides a cold-mixed cold-laid colored asphalt mixture, wherein the cold-mixed cold-laid colored asphalt mixture is a skeleton-dense asphalt mixture;

[0035] Calculated by mass percentage, the cold-mixed cold-laid colored asphalt mixture includes 10-13% of light-colored high-viscosity modified emulsified asphalt, 45-54% of first light-colored coarse aggregate of 5-8 mm, 18-23% of second light-colored coarse aggregate of 3-5 mm, 13-27% of light-colored fine aggregate of 0-3 mm, 2-4% of color powder and 1-2% of cement;

[0036] The light-colored high-viscosity modified emulsified asphalt has a softening point of >80°C, a dynamic viscosity of >30,000 Pa·s at 60°C, and an elastic recovery of >92% at 25°C.

[0037] This technical solution proposes a cold-mix, cold-laid colored asphalt mixture. By designing the type and raw materials of the cold-mix, cold-laid colored asphalt mixture, the cold-mix, cold-laid colored asphalt mixture has excellent strength, high-temperature stability and low-temperature crack resistance, ensuring that the laid colored asphalt pavement has excellent road performance and color durability, fully meeting actual application needs.

[0038] Specifically, the softening point and 60°C dynamic viscosity are important indicators for measuring the high-temperature stability and resistance to permanent deformation of road asphalt, while the 25°C elastic recovery reflects the ability of road asphalt to maintain toughness and reduce the risk of cracking under low temperature conditions. In order to ensure that cold-mixed and cold-laid colored asphalt mixtures can be constructed at room temperature while maintaining their excellent road performance and color durability, this technical solution specifically defines the three key performance indicators of light-colored high-viscosity modified emulsified asphalt: softening point, 60°C dynamic viscosity, and 25°C elastic recovery.

[0039] Compared with the light-colored high-viscosity modified emulsified asphalt commonly used in the prior art (whose softening point is usually 50°C, the dynamic viscosity at 60°C does not exceed 30,000 Pa·s, and the elastic recovery at 25°C is less than 85%), the light-colored high-viscosity modified emulsified asphalt used in this technical solution has achieved significant improvements in the above three performance indicators. The above-mentioned improvements not only enable the light-colored high-viscosity modified emulsified asphalt to more effectively bond with various light-colored aggregates (including the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate), thereby ensuring the strength of the cold-mixed and cold-laid colored asphalt mixture, avoiding pavement diseases such as peeling and shifting and fading caused by insufficient strength, and ensuring the road performance and color durability of the colored asphalt pavement such as anti-cracking and anti-rutting; moreover, it also gives the cold-mixed and cold-laid colored asphalt mixture a higher high-temperature stability and low-temperature crack resistance, effectively preventing the fading problem of the colored pavement due to aging and oil film shedding, further ensuring the road performance and color durability of the colored asphalt pavement, and meeting the needs of actual road construction.

[0040] Furthermore, the technical solution adds cement as a curing agent to the cold-mixed cold-laid colored asphalt mixture to consume the moisture in the colored asphalt mixture, thereby improving the early strength of the asphalt mixture. At the same time, the addition of cement can also accelerate the consumption rate of the moisture in the colored asphalt mixture, thereby increasing the speed of forming early strength. The above two effects are conducive to improving the strength of the cold-mixed cold-laid colored asphalt mixture, thereby improving the road performance and color durability of the cold-mixed cold-laid colored asphalt mixture. In addition, the improvement of early strength and its formation speed are also conducive to breaking through the limitations of the use of traditional cold-mixed cold-laid colored asphalt mixtures, shortening the time to open the colored asphalt pavement, and realizing the early opening of the colored asphalt pavement.

[0041] More specifically, the cold-mixed and cold-laid colored asphalt mixtures in the prior art mainly include suspended dense asphalt mixtures and skeleton void asphalt mixtures. Among them, the suspended dense asphalt mixture is a dense mixture composed of mineral materials (including coarse aggregates and fine aggregates) and asphalt that present a continuous gradation as a whole. In the above-mentioned asphalt mixture, since the amount of coarse aggregates is small and the amount of fine aggregates is large, the coarse aggregates are squeezed apart by the fine aggregates, so that the coarse aggregates exist in the fine aggregates in a suspended state, resulting in the suspended dense asphalt mixture being easy to soften at high temperatures and the stability being reduced, and being easy to harden at low temperatures and the brittleness being increased. That is, the strength, high temperature stability and low temperature crack resistance of the suspended dense asphalt mixture are all reduced, so that the road performance and color durability of the colored asphalt pavement paved by it are poor.

[0042] In addition, the skeleton void type asphalt mixture is a mixture with voids composed of mineral aggregates and asphalt with continuous open gradation as a whole. In the above asphalt mixture, there are more coarse aggregates, which are closely connected to form a skeleton, while the amount of fine aggregates is small and insufficient to fully fill the voids, which also reduces the strength, high temperature stability and low temperature crack resistance of the skeleton void type asphalt mixture, resulting in poor road performance and color durability of the colored asphalt pavement paved with it, which is difficult to meet the actual use needs.

[0043] In order to ensure the performance of cold-mixed and cold-laid colored asphalt mixture, the technical scheme adopts 5-8mm first light-colored coarse aggregate and 3-5mm second light-colored coarse aggregate as coarse aggregate, and the proportion design of high content of coarse aggregate and low content of fine aggregate, so that the cold-mixed and cold-laid colored asphalt mixture forms a skeleton-dense asphalt mixture. In the above-mentioned asphalt mixture, the skeleton structure is formed by the coarse aggregate, and the gaps between the coarse aggregates are fully filled to form a higher density, so that it has high strength, high temperature stability and low temperature crack resistance, thereby ensuring the road performance and color durability of the cold-mixed and cold-laid colored asphalt mixture.

[0044] It should be noted that emulsified asphalt and aggregate, as important components of the mixture, their colors directly determine the basic color tone of the colored asphalt pavement. If the color of the emulsified asphalt and aggregate is too dark, even if color powder is added, it may be difficult to completely cover up the dark color of the emulsified asphalt and aggregate, which is not conducive to color development, resulting in the overall color of the colored asphalt pavement being dark and unable to achieve the expected color effect. In addition, dark aggregates and dark emulsified asphalt may absorb sunlight and heat more easily, causing the temperature of the colored asphalt pavement to rise, accelerating the aging and wear of the asphalt. Therefore, based on the above principles, the colors of the coarse aggregate, fine aggregate and high-viscosity modified emulsified asphalt in this technical solution are all light-colored, thereby ensuring the color effect and performance requirements of the colored asphalt mixture.

[0045] Meanwhile, dark aggregate refers to aggregate which is darker in color such as black crushed stone, and light aggregate refers to aggregate which is darker in color such as white crushed stone.

[0046] In addition, the color powder of this technical solution only needs to comply with the technical requirements of the "Technical Code for Colored Asphalt Concrete Pavement of Urban Roads" (CJJ / T 218). The color powder can be red color powder, yellow color powder and other color powders. The specific type can be selected according to actual needs and is not limited here.

[0047] It is further explained that, calculated by mass percentage, the solid content of the evaporation residue of the light-colored high-viscosity modified emulsified asphalt is 55-65%.

[0048] The higher the solid content of the evaporation residue, the higher the adhesion, durability and stability of the light-colored high-viscosity modified emulsified asphalt. However, when the solid content of the evaporation residue of the light-colored high-viscosity modified emulsified asphalt is too high, the degree of improvement of the adhesion, durability and stability of the light-colored high-viscosity modified emulsified asphalt is limited, and the production cost is easily increased. Therefore, the technical solution limits the solid content of the evaporation residue of the light-colored high-viscosity modified emulsified asphalt to 55-65% to ensure the performance of the cold-mixed cold-laid colored asphalt mixture.

[0049] Further, calculated by mass percentage, the light-colored high-viscosity modified emulsified asphalt includes 60-62% of light-colored high-viscosity modified asphalt, 34-36.5% of water, 1.8-2.5% of fast-cracking and fast-setting emulsifier, and 0.5-1% of hydrochloric acid;

[0050] Calculated by mass percentage, the light-colored high-viscosity modified asphalt includes 5-8% C5 petroleum resin, 30-45% C9 petroleum resin, 7-13% star-shaped SBS modifier and 40-50% solvent oil;

[0051] The molecular weight of the star-shaped SBS modifier is greater than 300,000.

[0052] The use of fast-cracking and fast-setting emulsifiers is conducive to the rapid demulsification of light-colored high-viscosity modified emulsified asphalt, which adheres to the surface of the aggregate to form an asphalt film to wrap and bond the aggregate, so that the colored asphalt mixture is bonded to form a whole, ensuring the early strength of the colored asphalt mixture. The colored asphalt pavement formed after curing has a firm structure, good water resistance and aging resistance, which is conducive to ensuring road performance and color durability.

[0053] Furthermore, the molecular weight of the star-shaped SBS modifier is greater than 300,000, so that it has more physical cross-linking points and higher cohesive strength, which is beneficial to make the light-colored high-viscosity modified emulsified asphalt have high temperature stability, high elastic modulus, viscosity, low temperature performance and aging resistance, thereby improving the relevant properties of the colored asphalt mixture, ensuring the road performance of the colored asphalt pavement such as anti-rutting, anti-cracking, anti-water damage and anti-fatigue, while maintaining the durability of the color.

[0054] It should be noted that the fast-cracking and fast-setting emulsifier is the KL-BP1 anionic fast-cracking asphalt emulsifier produced by Boxing County Runda Chemical Co., Ltd.

[0055] In addition, the preparation method of light-colored high-viscosity modified emulsified asphalt is:

[0056] (1) After heating the solvent oil in the formula amount to 135-145° C., adding the C5 petroleum resin and the C9 petroleum resin in the formula amount to the heated solvent oil, stirring evenly to obtain a first mixed solution; adding the star-shaped SBS modifier in the formula amount to the mixed solution to swell for 30-40 minutes, and heating to 180-195° C. during the swelling process to obtain a second mixed solution; shearing the second mixed solution for 60-70 minutes, and then stirring for 20-30 minutes to obtain a light-colored high-viscosity modified asphalt;

[0057] (2) Heat the formulated amount of water to 60-70° C., add the formulated amount of fast-cracking and fast-setting emulsifier into the heated water and stir evenly, then add the formulated amount of hydrochloric acid to obtain a third mixed solution with a pH value of 2.0-2.5; add the formulated amount of light-colored high-viscosity modified asphalt into the third mixed solution, and then shear and grind to obtain a light-colored high-viscosity modified emulsified asphalt.

[0058] To further illustrate, calculated according to the mass percentage, the grading of the cold-mixed and cold-laid colored asphalt mixture is: the 9.5mm sieve hole pass rate is 100%, the 4.75mm sieve hole pass rate is 35-75%, the 2.36mm sieve hole pass rate is 15-35%, the 1.18mm sieve hole pass rate is 8-25%, the 0.6mm sieve hole pass rate is 6-20%, the 0.3mm sieve hole pass rate is 5-15%, the 0.015mm sieve hole pass rate is 4-12% and the 0.075mm sieve hole pass rate is 4-10%.

[0059] Optimizing the gradation of colored asphalt mixture is conducive to constructing an asphalt mixture with a dense skeleton structure with rich surface structure and high friction coefficient, so as to enhance the road performance and road performance of the colored asphalt mixture.

[0060] It is further explained that the first light-colored coarse aggregate and the second light-colored coarse aggregate are both crushed stone, and the light-colored fine aggregate is machine-made sand.

[0061] Since crushed stone has higher strength and greater polishing value, in order to further ensure the relevant performance of the drainage asphalt pavement, the first light-colored coarse aggregate and the second light-colored coarse aggregate in the present technical solution are both limited to crushed stone.

[0062] Since machine-made sand is clean, free of impurities, has good angularity and high roughness, and light-colored fine aggregate with good angularity has strong adhesion to asphalt and can improve the shear resistance of the mixture, the present technical solution preferably uses machine-made sand as the light-colored fine aggregate in the asphalt mixture.

[0063] It is further specified that the crushed stone is any one of limestone and granite;

[0064] The crushing value of the crushed stone is ≤18%, the abrasion value is ≤20%, and the apparent relative density is ≥2.6g / cm 3 , water absorption ≤1%, firmness ≤8%, and adhesion with the light-colored high-viscosity modified emulsified asphalt ≥ level 5.

[0065] Coarse aggregate is the main body of the asphalt mixture skeleton structure. It is required to have sufficient firmness, wear resistance, crushing value and abrasion value, square particle shape, sharp edges and corners, indicating roughness, dryness and cleanliness, good adhesion and hydrophobicity, so as to form a good embedded structure and a stable main skeleton, and improve the overall structural stability of the asphalt mixture. This technical solution optimizes the type and performance parameters of crushed stone, which is more conducive to the use of crushed stone as coarse aggregate in asphalt mixture to enhance the skeleton structure.

[0066] It is further explained that the machine-made sand is any one of quartz sand and dolomite;

[0067] The apparent relative density of the machine-made sand is ≥2.5g / cm 3 , firmness ≤12%, sand equivalent ≥65%.

[0068] Light-colored fine aggregate is an important factor affecting the shear resistance of asphalt mixture. Light-colored fine aggregate forms asphalt mortar with asphalt, which plays a role in filling and transferring loads in asphalt mixture. This technical solution optimizes the types and performance parameters of machine-made sand, which is more conducive to the use of machine-made sand as light-colored fine aggregate in asphalt mixture to play a role in filling and transferring loads.

[0069] A method for preparing a cold-mix cold-laid colored asphalt mixture, used for preparing the above-mentioned cold-mix cold-laid colored asphalt mixture, comprises the following steps:

[0070] A. Mixing the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate in a formula amount to obtain a first mixture;

[0071] B. Adding a formulated amount of light-colored high-viscosity modified emulsified asphalt into the first mixture and stirring to obtain a second mixture;

[0072] C. Adding a formulated amount of color powder into the second mixed material and stirring to obtain a third mixed material;

[0073] D. Add the formulated amount of cement into the third mixture and stir to obtain a cold-mixed and cold-laid colored asphalt mixture.

[0074] This technical solution also proposes a method for preparing a cold-mixed and cold-laid colored asphalt mixture, which has simple steps and strong operability, and is conducive to avoiding weakening the relevant properties of the colored asphalt mixture during the preparation process.

[0075] It is further specified that the stirring time of step A is 10 to 12 seconds; and the total stirring time of steps B, C and D is not less than 1.2 minutes.

[0076] The stirring time of step A is limited to 10 to 12 seconds, so that the first light-colored coarse aggregate, the second light-colored coarse aggregate and the line-colored fine aggregate are fully mixed to form a uniform first mixture, which is conducive to the uniform distribution of light-colored high-viscosity modified emulsified asphalt, color powder and cement in the subsequent steps. In addition, by controlling the total stirring time, it is conducive to eliminating bubbles and voids in the colored asphalt mixture, improving its density and uniformity, and thus ensuring the relevant performance of the colored asphalt mixture.

[0077] The invention discloses an application of a cold-mixed and cold-laid colored asphalt mixture in a colored asphalt pavement, wherein the laying thickness of the cold-mixed and cold-laid colored asphalt mixture is 1.2 to 2.0 cm.

[0078] The paving thickness of traditional cold-mixed and cold-laid colored asphalt mixture must be at least 4 cm to ensure the realization of excellent performance of colored asphalt pavement. However, if the cold-mixed and cold-laid colored asphalt mixture prepared by this scheme is used to pave colored asphalt pavement, its implementation thickness only needs to reach 1.2 to 2.0 cm, which can meet the performance requirements of colored asphalt pavement and greatly reduce the paving cost.

[0079] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0080] Example 1

[0081] In this embodiment, the gradation of the cold-mixed cold-laid colored asphalt mixture is calculated by mass percentage as follows: the 9.5mm sieve hole pass rate is 100%, the 4.75mm sieve hole pass rate is 50.1%, the 2.36mm sieve hole pass rate is 25.5%, the 1.18mm sieve hole pass rate is 18.2%, the 0.6mm sieve hole pass rate is 16.2%, the 0.3mm sieve hole pass rate is 9.7%, the 0.015mm sieve hole pass rate is 7.3% and the 0.075mm sieve hole pass rate is 6.7%; calculated by mass percentage, the cold-mixed cold-laid colored asphalt mixture includes 10% of light-colored high-viscosity modified emulsified asphalt, 49% of 5-8mm crushed stone, 18% of 3-5mm crushed stone, 20% of 0-3mm machine-made sand, 2% of yellow toner and 1% of cement; the softening point of the light-colored high-viscosity modified emulsified asphalt is At 90℃, the dynamic viscosity at 60℃ is 40,000 Pa·s, the elastic recovery at 25℃ is 95%, and the solid content of the evaporation residue of the light-colored high-viscosity modified emulsified asphalt is 60% calculated by mass percentage; the light-colored high-viscosity modified emulsified asphalt includes 62% of light-colored high-viscosity modified asphalt, 34.5% of water, 2.5% of fast-cracking and fast-setting emulsifier and 1% of hydrochloric acid calculated by mass percentage; the light-colored high-viscosity modified asphalt includes 5% of C5 petroleum resin, 40% of C9 petroleum resin, 12% of star-shaped SBS modifier with a molecular weight of 400,000 and 43% of solvent oil calculated by mass percentage; the fast-cracking and fast-setting emulsifier is KL-BP1 anionic fast-cracking asphalt emulsifier produced by Boxing County Runda Chemical Co., Ltd.; the crushed stone is limestone, the crushing value of the crushed stone is 16%, the abrasion value is 14%, and the apparent relative density is 2.7g / cm 3 The water absorption rate is 0.5%, the firmness is 5%, and the adhesion with light-colored high-viscosity modified emulsified asphalt is level 5; the machine-made sand is quartz sand, and the apparent relative density of the machine-made sand is 2.8g / cm 3 , firmness is 10% and sand equivalent is 67%.

[0082] A method for preparing a cold-mix cold-laid colored asphalt mixture in this embodiment comprises the following steps:

[0083] A. Stirring the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate in the formula amount for 12 seconds to obtain a first mixture;

[0084] B. Add the formulated amount of light-colored high-viscosity modified emulsified asphalt to the first mixture and stir for 40 seconds to obtain a second mixture;

[0085] C. Add the formulated amount of color powder to the second mixture and stir for 25 seconds to obtain a third mixture;

[0086] D. Add the formulated amount of cement into the third mixture and stir for 25 seconds to obtain a cold-mixed and cold-laid colored asphalt mixture.

[0087] Example 2

[0088] In this embodiment, the gradation of the cold-mixed cold-laid colored asphalt mixture is calculated by mass percentage as follows: the 9.5mm sieve hole pass rate is 100%, the 4.75mm sieve hole pass rate is 48.2%, the 2.36mm sieve hole pass rate is 23.5%, the 1.18mm sieve hole pass rate is 18.5%, the 0.6mm sieve hole pass rate is 17.7%, the 0.3mm sieve hole pass rate is 10.3%, the 0.015mm sieve hole pass rate is 8.3% and the 0.075mm sieve hole pass rate is 6.3%; calculated by mass percentage, the cold-mixed cold-laid colored asphalt mixture includes 13% of light-colored high-viscosity modified emulsified asphalt, 48% of 5-8mm crushed stone, 20% of 3-5mm crushed stone, 20% of 0-3mm machine-made sand, 2% of red toner and 1% of cement; the softening point of the light-colored high-viscosity modified emulsified asphalt is 8 The dynamic viscosity at 5℃ and 60℃ is 35,000 Pa·s, the elastic recovery at 25℃ is 98%, and the solid content of the evaporation residue of the light-colored high-viscosity modified emulsified asphalt is 65% calculated by mass percentage; the light-colored high-viscosity modified emulsified asphalt includes 61% of light-colored high-viscosity modified asphalt, 36% of water, 2.5% of fast-cracking and fast-setting emulsifier and 0.5% of hydrochloric acid calculated by mass percentage; the light-colored high-viscosity modified asphalt includes 6% of C5 petroleum resin, 44% of C9 petroleum resin, 10% of star-shaped SBS modifier with a molecular weight of 380,000 and 40% of solvent oil calculated by mass percentage; the fast-cracking and fast-setting emulsifier is KL-BP1 anionic fast-cracking asphalt emulsifier produced by Boxing County Runda Chemical Co., Ltd.; the crushed stone is limestone, the crushing value of the crushed stone is 17%, the abrasion value is 14%, and the apparent relative density is 2.955g / cm 3 The water absorption rate is 0.72%, the firmness is 2.0%, and the adhesion with light-colored high-viscosity modified emulsified asphalt is level 5; the machine-made sand is quartz sand, and the apparent relative density of the machine-made sand is 2.7g / cm 3 , firmness is 10% and sand equivalent is 66%.

[0089] A method for preparing a cold-mix cold-laid colored asphalt mixture in this embodiment comprises the following steps:

[0090] A. Stirring the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate in the formula amount for 11 seconds to obtain a first mixture;

[0091] B. Add the formulated amount of light-colored high-viscosity modified emulsified asphalt to the first mixture and stir for 45 seconds to obtain a second mixture;

[0092] C. Add the formulated amount of color powder to the second mixture and stir for 15 seconds to obtain a third mixture;

[0093] D. Add the formulated amount of cement into the third mixture and stir for 15 seconds to obtain a cold-mixed and cold-laid colored asphalt mixture.

[0094] Example 3

[0095] In this embodiment, the gradation of the cold-mixed cold-laid colored asphalt mixture is calculated according to the mass percentage: the 9.5mm sieve hole pass rate is 100%, the 4.75mm sieve hole pass rate is 50%, the 2.36mm sieve hole pass rate is 20%, the 1.18mm sieve hole pass rate is 17%, the 0.6mm sieve hole pass rate is 12%, the 0.3mm sieve hole pass rate is 10%, the 0.015mm sieve hole pass rate is 8% and the 0.075mm sieve hole pass rate is 6%; calculated according to the mass percentage, the cold-mixed cold-laid colored asphalt mixture includes 12% of light-colored high-viscosity modified emulsified asphalt, 51% of 5-8mm crushed stone, 19% of 3-5mm crushed stone, 13% of 0-3mm machine-made sand, 3% of green toner and 2% of cement; the softening point of the light-colored high-viscosity modified emulsified asphalt is 90°C, and the dynamic pressure at 60°C is 0. The mechanical viscosity is 45,000 Pa·s, the elastic recovery at 25°C is 95%, and the solid content of the evaporation residue of the light-colored high-viscosity modified emulsified asphalt is 65% calculated by mass percentage; the light-colored high-viscosity modified emulsified asphalt includes 60.5% of light-colored high-viscosity modified asphalt, 36.5% of water, 2% of fast-cracking and fast-setting emulsifier and 1% of hydrochloric acid calculated by mass percentage; the light-colored high-viscosity modified asphalt includes 8% of C5 petroleum resin, 35% of C9 petroleum resin, 8% of star-shaped SBS modifier with a molecular weight of 350,000 and 49% of solvent oil calculated by mass percentage; the fast-cracking and fast-setting emulsifier is KL-BP1 anionic fast-cracking asphalt emulsifier produced by Boxing County Runda Chemical Co., Ltd.; the crushed stone is limestone, the crushing value of the crushed stone is 15%, the abrasion value is 13.0%, and the apparent relative density is 2.90g / cm 3 The water absorption rate is 0.70%, the firmness is 2.0%, and the adhesion with light-colored high-viscosity modified emulsified asphalt is ≥ level 5; the machine-made sand is quartz sand, and the apparent relative density of the machine-made sand is 2.8g / cm 3 , firmness is 9% and sand equivalent is 68%.

[0096] A method for preparing a cold-mix cold-laid colored asphalt mixture in this embodiment comprises the following steps:

[0097] A. Stir the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate in the formula amount for 10 seconds to obtain a first mixture;

[0098] B. Add the formulated amount of light-colored high-viscosity modified emulsified asphalt to the first mixture and stir for 40 seconds to obtain a second mixture;

[0099] C. Add the formulated amount of color powder to the second mixture and stir for 20 seconds to obtain a third mixture;

[0100] D. Add the formulated amount of cement into the third mixture and stir for 20 seconds to obtain a cold-mixed and cold-laid colored asphalt mixture.

[0101] The cold-mixed, cold-laid colored asphalt mixture obtained in the embodiment was used to lay a colored asphalt pavement, and the laying thickness is shown in Table 1 below. The cold-mixed, cold-laid colored asphalt mixture after laying was tested for relevant performances according to the standards specified in the "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011); in addition, it was compared with a 4 cm colored asphalt pavement laid by an existing conventional colored asphalt mixture, and the results are shown in Table 1 below.

[0102] Table 1 Related performance test results of colored asphalt pavement

[0103]

[0104]

[0105] From the performance test results in Table 1, it can be seen that the relevant performance of the colored asphalt pavement obtained by the present technical solution is much higher than the open standard of the colored asphalt pavement specified in the "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), and the various performance test indicators of the colored asphalt pavement paved by the colored asphalt mixture of the present technical solution are excellent. The various performance test indicators of the existing colored asphalt pavement can break through the functional application limitations of the existing colored asphalt pavement, so that the colored asphalt mixture has better road performance and color durability when forming a colored asphalt pavement, ensuring the pavement requirements of the colored asphalt pavement in places where the road performance and color durability of the colored asphalt pavement are required to be higher.

[0106] It should be noted that, calculated by mass percentage, the gradation of the existing conventional colored asphalt mixture is: 19mm sieve hole pass rate is 100%, 16mm sieve hole pass rate is 90%, 13.2mm sieve hole pass rate is 85%, 9.5mm sieve hole pass rate is 70%, 4.75mm sieve hole pass rate is 58%, 2.36mm sieve hole pass rate is 28%, 1.18mm sieve hole pass rate is 25%, 0.6mm sieve hole pass rate is 16%, 0.3mm sieve hole pass rate is 12 %, the passing rate of 0.015mm sieve hole is 10% and the passing rate of 0.075mm sieve hole is 6%; calculated by mass percentage, the existing conventional colored asphalt mixture includes 90# petroleum asphalt 5.0%, 10-20mm crushed stone 25%, 5-10mm crushed stone 21%, 3-5mm crushed stone 15%, 0-3mm machine-made sand 30% and yellow toner 4%; the crushed stone is limestone, the crushing value of the crushed stone is 15%, the abrasion value is 13%, and the apparent relative density is 2.7g / cm 3 The water absorption rate is 0.5%, the firmness is 4%, and the adhesion to No. 90 petroleum asphalt is level 5; the machine-made sand is quartz sand, and the apparent relative density of the machine-made sand is 2.8g / cm3 , firmness is 10% and sand equivalent is 67%.

[0107] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A cold-mixed cold-laid colored asphalt mixture, characterized in that: The cold-mixed and cold-laid colored asphalt mixture is a skeleton-dense asphalt mixture; Calculated by mass percentage, the cold-mixed cold-laid colored asphalt mixture includes 10-13% of light-colored high-viscosity modified emulsified asphalt, 45-54% of first light-colored coarse aggregate of 5-8 mm, 18-23% of second light-colored coarse aggregate of 3-5 mm, 13-27% of light-colored fine aggregate of 0-3 mm, 2-4% of color powder and 1-2% of cement; The light-colored high-viscosity modified emulsified asphalt has a softening point of >80°C, a dynamic viscosity of >30,000 Pa·s at 60°C, and an elastic recovery of >92% at 25°C.

2. The cold-mixed cold-laid colored asphalt mixture according to claim 1, characterized in that: Calculated by mass percentage, the evaporation residue solid content of the light-colored high-viscosity modified emulsified asphalt is 55-65%.

3. The cold-mixed cold-laid colored asphalt mixture according to claim 1, characterized in that: Calculated by mass percentage, the light-colored high-viscosity modified emulsified asphalt includes 60-62% of light-colored high-viscosity modified asphalt, 34-36.5% of water, 1.8-2.5% of fast-cracking and fast-setting emulsifier, and 0.5-1% of hydrochloric acid; Calculated by mass percentage, the light-colored high-viscosity modified asphalt includes 5-8% C5 petroleum resin, 30-45% C9 petroleum resin, 7-13% star-shaped SBS modifier and 40-50% solvent oil; The molecular weight of the star-shaped SBS modifier is greater than 300,000.

4. The cold-mixed cold-laid colored asphalt mixture according to claim 1, characterized in that: Calculated according to mass percentage, the grading of the cold-mixed and cold-laid colored asphalt mixture is: the 9.5mm sieve hole pass rate is 100%, the 4.75mm sieve hole pass rate is 35-75%, the 2.36mm sieve hole pass rate is 15-35%, the 1.18mm sieve hole pass rate is 8-25%, the 0.6mm sieve hole pass rate is 6-20%, the 0.3mm sieve hole pass rate is 5-15%, the 0.015mm sieve hole pass rate is 4-12% and the 0.075mm sieve hole pass rate is 4-10%.

5. The cold-mixed cold-laid colored asphalt mixture according to claim 1, characterized in that: The first light-colored coarse aggregate and the second light-colored coarse aggregate are both crushed stone, and the light-colored fine aggregate is machine-made sand.

6. The cold-mixed cold-laid colored asphalt mixture according to claim 5, characterized in that: The crushed stone is any one of limestone and granite; The crushing value of the crushed stone is ≤18%, the abrasion value is ≤20%, and the apparent relative density is ≥2.6g / cm 3 , water absorption ≤1%, firmness ≤8%, and adhesion with the light-colored high-viscosity modified emulsified asphalt ≥ level 5.

7. The cold-mixed and cold-laid colored asphalt mixture according to claim 5, characterized in that: The machine-made sand is any one of quartz sand and dolomite; The apparent relative density of the machine-made sand is ≥2.5g / cm 3 , firmness ≤12%, sand equivalent ≥65%.

8. A method for preparing cold-mixed and cold-laid colored asphalt mixture, characterized in that: The method for preparing the cold-mix cold-laid colored asphalt mixture according to any one of claims 1 to 7 comprises the following steps: A. Mixing the first light-colored coarse aggregate, the second light-colored coarse aggregate and the light-colored fine aggregate in a formula amount to obtain a first mixture; B. Adding a formulated amount of light-colored high-viscosity modified emulsified asphalt into the first mixture and stirring to obtain a second mixture; C. Adding a formulated amount of color powder to the second mixed material and stirring to obtain a third mixed material; D. Add the formulated amount of cement into the third mixture and stir to obtain a cold-mixed and cold-laid colored asphalt mixture.

9. The method for preparing cold-mixed and cold-laid colored asphalt mixture according to claim 8, characterized in that: The stirring time of step A is 10 to 12 seconds; the total stirring time of steps B, C and D is not less than 1.2 minutes.

10. Application of cold-mixed and cold-laid colored asphalt mixture in colored asphalt pavement, characterized in that: The paving thickness of the cold-mixed and cold-laid colored asphalt mixture is 1.2 to 2.0 cm.

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