Asphalt compacting agent, preparation method thereof and mixture

Abstract

The invention discloses an easy-to-compact asphalt modifier, a preparation method thereof and a mixture, and relates to the technical field of building materials used in road engineering, the easy-to-compact asphalt modifier comprises the following raw materials by mass: 10-20 parts of a styrene-butadiene-styrene block copolymer; 5 to 10 parts of a styrene-isoprene-styrene block copolymer; 1-2 parts of zinc oxide; 1-2 parts of stearic acid; 1-2 parts of an antioxidant; 1-2 parts of tackifying resin; 2-4 parts of an accelerant; 1-2 parts of sulfur; 25-35 parts of environment-friendly aromatic hydrocarbon oil; 35-45 parts of naphthenic saturated hydrocarbon oil; and 5-10 parts of C18 unsaturated oil. The asphalt compacting agent disclosed by the invention does not reduce the softening point of asphalt while reducing the viscosity of the asphalt, improves the pavement performance and durability of a mixture to a certain extent, optimizes the cost, improves the construction workability, is environment-friendly and emission-reducing, and can be widely applied to construction of surface layers of highways and other high-grade highways and pavement reconstruction projects.

Description

Technical Field

[0001] The invention relates to the technical field of building materials used in road engineering, and more specifically to an asphalt compacting agent and a preparation method and a mixture thereof. Background Art

[0002] Organic additive technology is to add low-melting-point organic additives to asphalt. The melted additives will form liquids, which will reduce the viscosity of asphalt at a specified temperature, thereby reducing the mixing temperature of asphalt mixtures. At the same time, the addition of organic additives cannot reduce the viscosity of the base asphalt at the pavement use temperature, because at the pavement use temperature, the viscosity reflects the ability of the asphalt mixture to flow. The greater the viscosity, the worse the fluidity, and the stronger the asphalt pavement's ability to resist rutting. The traditional asphalt compactors currently on the market, while reducing the viscosity of asphalt, also greatly reduce the softening point of asphalt, greatly reducing its performance and shortening the life of the road. Summary of the invention

[0003] The object of the present invention is to provide an asphalt compacting agent which is a jelly-like composition formed by blending a high-efficiency compacting aid with a polymer elastomer, which can compact asphalt without reducing its softening point and can increase the road performance and durability of the mixture to a certain extent.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides an asphalt compacting agent, which includes the following raw materials in parts by mass: 10 to 20 parts of styrene-butadiene-styrene block copolymer (SBS); 5 to 10 parts of styrene-isoprene-styrene block copolymer (SIS); 1 to 2 parts of zinc oxide; 1 to 2 parts of stearic acid; 1 to 2 parts of antioxidant; 1 to 2 parts of tackifying resin; 2 to 4 parts of accelerator; 1 to 2 parts of sulfur; 25 to 35 parts of environmentally friendly aromatic oil; 35 to 45 parts of cycloparaffin saturated hydrocarbon oil; and 5 to 10 parts of octadecane unsaturated oil.

[0005] Preferably, the antioxidant is prepared by compounding a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:5.

[0006] Preferably, the tackifying resin is a combination of one or more of terpene resin, hydrogenated rosin, C9 resin and C5 resin.

[0007] Preferably, the accelerator is prepared by compounding dimorpholine dithioate and tetramethylthioperoxydicarbonamide in a mass ratio of 1:1.

[0008] The present invention also provides a method for preparing an asphalt compacting agent, which comprises the following steps: S1: according to the above mass parts, 25-35 parts of environmentally friendly aromatic oil, 35-45 parts of cycloparaffinic saturated hydrocarbon oil, and 5-10 parts of octadecane unsaturated oil are added into a reaction kettle and the temperature is raised to 120°C; S2: Then slowly add 10-20 parts of styrene-butadiene-styrene block copolymer and 5-10 parts of styrene-isoprene-styrene block copolymer, and stir for 1 hour to fully dissolve them; S3: Then add other additives: 1-2 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of antioxidant, 1-2 parts of tackifying resin, 2-4 parts of accelerator, 1-2 parts of sulfur, stir for 1 hour, cool to 80℃ and then pack.

[0009] The present invention also provides an asphalt mixture, which comprises asphalt, aggregate and the above-mentioned asphalt compacting agent or the asphalt compacting agent prepared by the above-mentioned preparation method.

[0010] Furthermore, the aggregate is prepared in sufficient amount according to the aggregate grading AC-13, and then placed in an oven at 160° C. to dry and remove water for 2.5 hours.

[0011] Furthermore, when the site conditions cannot meet the requirements of good grading, the aggregate can be configured based on experience using 5-10mm crushed stone and machine-made sand in a mass ratio of 6-7:3-4.

[0012] In summary, due to the adoption of the above technical solution, the present invention has at least the following beneficial effects: 1. Compared with the common asphalt compacting agent which is widely used in the market, the present invention solves the problem that the high temperature performance of asphalt is greatly reduced while reducing the viscosity of asphalt; the present invention adopts SBS, SIS, tackifying resin and light oil for blending and modification, and adjusts the proportion of various additives such as SBS, SIS, tackifying resin, etc., so that the unsaturated phenol in asphalt, the unsaturated double bonds in SBS, unsaturated oil and unsaturated components in aromatic oil are cross-linked, thereby improving the high temperature performance and fatigue resistance of asphalt and the anti-rutting ability and durability of the mixture.

[0013] Specifically, the styrene-isoprene-styrene block copolymer (SIS) used in the present invention is a synthetic polymer material composed of styrene, isoprene and styrene monomers arranged alternately in a block structure. It has good elasticity and resilience, can return to its original shape after strain, and can provide good adhesion performance, and can still maintain good elasticity and viscosity at low temperatures.

[0014] Among them, SBS effectively improves the softening point and ductility of asphalt, SIS improves the fatigue resistance of asphalt, and tackifying resins improve the interfacial bonding performance between asphalt and aggregate, and improve the Marshall strength and anti-rutting ability of the mixture. Light components such as hydrocarbon oil, aromatic oil and 18-carbon unsaturated oil dissolve various components in asphalt respectively, effectively reducing the viscosity of asphalt and facilitating paving; antioxidants improve the durability of asphalt and extend the life of asphalt; the remaining additives work synergistically to cross-link the unsaturated phenol in asphalt, the unsaturated double bonds in SBS, unsaturated oil and unsaturated components in aromatic oil, further improving the softening point of asphalt, and finally sulfur is added as a stabilizer.

[0015] In general, the present invention effectively solves the problem that the existing traditional asphalt compacting agent reduces the viscosity of asphalt while also greatly reducing the softening point of asphalt, which greatly reduces its high-temperature performance. By blending the high-efficiency compacting agent with the polymer elastomer, the viscosity of asphalt is reduced without reducing its softening point. The adhesion between asphalt and aggregate is enhanced, thereby improving the high-temperature performance loss problem of compacted asphalt mixture.

[0016] 2. The present invention adopts an asphalt compacting agent which is a jelly-like composition formed by blending an asphalt high-efficiency compacting aid and a polymer elastomer, and mixes it with SBS modified asphalt to obtain an easy-to-compact modified asphalt. Under the premise of ensuring the mechanical properties of the original asphalt binder, the viscosity of the existing binder in various temperature ranges is effectively improved, the mixture is easier to roll and compact, and has better anti-fatigue performance. The raw materials used in the compacting agent are more environmentally friendly, easy to obtain, and low-cost than other easy-to-compact agents, and have industrial utilization value. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the construction waste roadbed structure and construction method of the present invention in conjunction with the embodiments, so that the purpose, technical solution and advantages of the present invention are more clearly understood. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Embodiment 1, an asphalt compacting agent, comprises the following raw materials, measured by weight: 10-20 parts of styrene-butadiene-styrene block copolymer (SBS); 5-10 parts of styrene-isoprene-styrene block copolymer (SIS); 1-2 parts of zinc oxide; 1-2 parts of stearic acid; 1-2 parts of antioxidant; 1-2 parts of tackifying resin; 2-4 parts of accelerator; 1-2 parts of sulfur; 25-35 parts of environmentally friendly aromatic oil; 35-45 parts of cycloparaffin saturated hydrocarbon oil; 5-10 parts of octadecane unsaturated oil.

[0019] In this embodiment, the antioxidant is prepared by compounding a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:5.

[0020] In this embodiment, the tackifying resin is a combination of one or more of terpene resin, hydrogenated rosin, C9 resin, and C5 resin.

[0021] In this embodiment, the accelerator is prepared by compounding dimorpholine dithioate and tetramethylthioperoxydicarbonamide in a mass ratio of 1:1.

[0022] Embodiment 2, a method for preparing an asphalt compacting agent, comprising the following steps: S1: According to the mass fraction, 25-35 parts of environmentally friendly aromatic oil, 35-45 parts of cycloparaffinic saturated hydrocarbon oil, and 5-10 parts of octadecane unsaturated oil are added into a reaction kettle, and the temperature is raised to 120°C; S2: Then slowly add 10-20 parts of styrene-butadiene-styrene block copolymer and 5-10 parts of styrene-isoprene-styrene block copolymer, and stir for 1 hour to fully dissolve them; S3: Then add other additives: 1-2 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of antioxidant, 1-2 parts of tackifying resin, 2-4 parts of accelerator, 1-2 parts of sulfur, stir for 1 hour, cool to 80℃ and then pack.

[0023] Embodiment 3, the present invention further provides a method for preparing an asphalt mixture, wherein the asphalt mixture comprises asphalt, aggregate and the asphalt compacting agent in Embodiment 1 or the asphalt compacting agent prepared by the preparation method in the above-mentioned Embodiment 2.

[0024] In this embodiment, the method for preparing the asphalt mixture comprises the following steps: (1) The grading of the ore is prepared according to AC-13, as shown in the table below.

[0025] (2) After that, sufficient stone should be prepared according to the aggregate grading, and then placed in an oven at 160°C to dry and remove water for 2.5 hours.

[0026] (3) Slowly add the prepared easy-to-compact asphalt binder to the prepared aggregate and mix it evenly using a mixer. The mixing time should be controlled within 10 minutes. The specific mixing time should be based on the site conditions and the mixture should be stirred until there is no white material.

[0027] The preparation of the easily compacted asphalt mixture is now completed.

[0028] It is worth noting that in other embodiments, when the site conditions cannot meet the requirements of good grading, the aggregate can be configured based on experience using 5-10 mm crushed stone and machine-made sand in a mass ratio of 6-7:3-4.

[0029] Embodiment 4, a construction method using the asphalt mixture described in embodiment 3, comprising the following steps: (1) Mixing: Mixing is done by conventional hot mixing method, and the mixture can be used immediately after mixing; (2) Paving: Before paving, the base (i.e. the surface after chiseling) is cleaned with a blower, and then the mixture is spread manually; (3) Rolling: Rolling adopts conventional hot mix asphalt pavement compaction method, and the number of compaction times is 2 to 3 times; (4) Curing: After the construction is completed, the mixture should be cured for several hours and traffic can be opened after it cools down.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An asphalt compacting agent, characterized in that: The raw materials are as follows, in terms of mass: 10 to 20 parts of styrene-butadiene-styrene block copolymer; 5 to 10 parts of styrene-isoprene-styrene block copolymer; 1 to 2 parts of zinc oxide; 1 to 2 parts of stearic acid; 1 to 2 parts of antioxidant; 1 to 2 parts of tackifying resin; 2 to 4 parts of accelerator; 1 to 2 parts of sulfur; 25 to 35 parts of environmentally friendly aromatic oil; 35 to 45 parts of cycloparaffin saturated hydrocarbon oil; and 5 to 10 parts of octadecane unsaturated oil.

2. The asphalt compacting agent according to claim 1, characterized in that: The antioxidant is prepared by compounding a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:

5.

3. The asphalt compacting agent according to claim 1, characterized in that: The tackifying resin is a combination of one or more of terpene resin, hydrogenated rosin, C9 resin and C5 resin.

4. The asphalt compacting agent according to claim 1, characterized in that: The accelerator is prepared by compounding dimorpholine dithioate and tetramethylthioperoxydicarbonic acid diamide in a mass ratio of 1:

1.

5. A method for preparing an asphalt compacting agent, characterized in that: The steps include: S1: according to the above mass parts, 25-35 parts of environmentally friendly aromatic oil, 35-45 parts of cycloparaffinic saturated hydrocarbon oil, and 5-10 parts of octadecane unsaturated oil are added into a reactor and the temperature is raised to 120°C; S2: Then slowly add 10-20 parts of styrene-butadiene-styrene block copolymer and 5-10 parts of styrene-isoprene-styrene block copolymer, and stir for 1 hour to fully dissolve them; S3: Then add other additives: 1-2 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of antioxidant, 1-2 parts of tackifying resin, 2-4 parts of accelerator, 1-2 parts of sulfur, stir for 1 hour, cool to 80℃ and then pack.

6. An asphalt mixture comprising asphalt, aggregate and asphalt compacting agent, characterized in that: The asphalt compacting agent is the asphalt compacting agent as described in any one of claims 1 to 4 or the asphalt compacting agent prepared by the preparation method as described in claim 5.

7. An asphalt mixture according to claim 6, characterized in that: The aggregate is prepared in sufficient amount according to the aggregate grading AC-13, and then placed in an oven for drying and dehydration at 160° C. for 2.5 hours.

8. An asphalt mixture according to claim 6, characterized in that: When the site conditions cannot meet the requirements of good grading, the aggregate can be configured based on experience using 5-10mm crushed stone and machine-made sand in a mass ratio of 6-7:3-4.

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