阅读说明：本技术 一种适用于机场道面的环氧沥青玛蹄脂碎石混合料及其制备方法 (Epoxy asphalt mastic macadam mixture suitable for airport pavement and preparation method thereof ) 是由 闵召辉 王正奇 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种适用于机场道面的环氧沥青玛蹄脂碎石混合料及其制备方法,混合料由以下质量份的原料制成：0.7~2.1份环氧树脂、0.5~1.9份固化组分、2.9~7.9份SBS改性沥青、100~150份矿料及0.3~0.6份纤维。本发明将SBS改性沥青进行预热,并加入到预热好的按设计级配确定的粗集料、细集料中,再向其中加入混合均匀的环氧树脂和固化组分并搅拌,最后加入纤维和矿粉并搅拌。本发明利用环氧沥青强度高,抗水损性能优良、抗老化性能优异等特点,制备得到的适用于机场道面的环氧沥青玛蹄脂碎石混合料具有良好的强度和耐久性,可使机场道面具有良好的耐磨耗性,降低沥青道面发生轮辙病害的风险。本发明制备方法简单、节能环保,具有较高的社会价值和经济价值。(The invention discloses an epoxy asphalt mastic macadam mixture suitable for airport pavement and a preparation method thereof, wherein the mixture is prepared from the following raw materials in parts by mass: 0.7-2.1 parts of epoxy resin, 0.5-1.9 parts of curing component, 2.9-7.9 parts of SBS modified asphalt, 100-150 parts of mineral aggregate and 0.3-0.6 part of fiber. The invention preheats SBS modified asphalt, adds it into the preheated coarse aggregate and fine aggregate according to the designed gradation, adds the epoxy resin and solidifying component into it and stirs, finally adds the fiber and mineral powder and stirs. The invention utilizes the characteristics of high strength, excellent water loss resistance, excellent ageing resistance and the like of the epoxy asphalt to prepare the epoxy asphalt mastic macadam mixture suitable for the airport pavement, which has good strength and durability, can ensure that the airport pavement has good wear resistance and reduce the risk of track diseases on the asphalt pavement. The preparation method is simple, energy-saving and environment-friendly, and has high social value and economic value.)

1. The epoxy asphalt mastic gravel mixture suitable for the airport pavement is characterized by comprising, by mass, 0.7-2.1 parts of epoxy resin, 0.5-1.9 parts of curing component, 2.9-7.9 parts of SBS modified asphalt, 100-150 parts of mineral aggregate and 0.3-0.6 part of fiber.

2. The epoxy asphalt mastic macadam mixture for airport pavements according to claim 1, wherein the epoxy resin is bisphenol a type epoxy resin E-51.

3. The epoxy asphalt mastic macadam mixture for airport pavements according to claim 1, wherein the curing component is a modified amine curing agent.

4. The epoxy asphalt mastic macadam mixture for airport pavements according to claim 1, wherein the mass ratio of the epoxy resin to the curing component is 0.8-1.6.

5. The epoxy asphalt mastic gravel mixture suitable for airport pavement as claimed in claim 1, wherein the mass ratio of the epoxy resin, the curing component, the SBS modified asphalt to the mineral aggregate is 4.1-7.5%.

6. The epoxy asphalt mastic macadam mixture for airport pavements according to claim 1, wherein the mineral aggregate is a mixture of coarse, fine and mineral aggregates.

7. The epoxy asphalt mastic macadam mixture suitable for airport pavements according to claim 6, wherein the mass portion ratio of the coarse aggregate to the fine aggregate is in accordance with gap gradation, and the maximum nominal particle size of the gap gradation can be selected from one of three gradations of SMA-16, SMA-13 and SMA-10 corresponding to 16mm, 13.2mm and 9.5 mm.

8. The epoxy asphalt mastic macadam mixture for airport pavements according to claim 6, wherein the coarse aggregate is basalt macadam, the fine aggregate is basalt or limestone natural sand, and the mineral powder is limestone powder.

9. The epoxy asphalt mastic macadam mixture for airport pavements according to claim 1, wherein the fibers are one of polyester fibers, lignin fibers or mineral fibers.

10. The method for preparing an epoxy asphalt mastic macadam mixture for airport pavements according to any one of claims 1 to 9, comprising the steps of:

(1) preheating coarse aggregates and fine aggregates determined according to the design grading at 160-200 ℃, wherein the preheating time is 3-4 hours;

(2) preheating SBS modified asphalt at 160-180 ℃, and adding the SBS modified asphalt into the preheated coarse aggregate and the preheated fine aggregate in the step (1);

(3) uniformly mixing epoxy resin and a curing component, adding the mixture into the mixture obtained in the step (2), and stirring for 10-30 s;

(4) and (4) adding fibers and mineral powder into the mixture obtained in the step (3) and stirring the mixture for 10-30 s to obtain the epoxy asphalt mastic gravel mixture suitable for the airport pavement.

Technical Field

The invention belongs to the technical field of road building materials, and relates to an epoxy asphalt mastic macadam mixture suitable for an airport pavement overlay and a preparation method thereof.

Background

The asphalt concrete pavement has the advantages of good road performance such as flatness, shock absorption, skid resistance and the like, high mechanization degree, short construction period, convenient maintenance and the like, and is widely applied to large civil airports. However, with the advent of a380 and other new generation large passenger aircraft and the rapid increase in traffic volume, a series of early diseases appeared on the asphalt pavement. The prior art can not meet the requirements of the strength and the durability of the airport pavement, and a new mixture preparation technology is urgently needed to solve new problems.

In the asphalt pavement surface diseases of civil airports in China, the wheel track diseases are one of structural damage forms which have the highest occurrence rate and the largest influence. In the process of waiting for taking off of the airplane, on one hand, the asphalt layer is accelerated to be heated by hot air flow of an airplane engine, on the other hand, the asphalt layer is easy to compact and sink due to vibration in the operation process of the airplane engine, plastic deformation can gradually occur to the asphalt mixture through repeated action of airplane load, and particularly, when the temperature and the wheel pressure are high, the plastic deformation amount slowly accumulated by the asphalt layer due to creep deformation is large. In order to solve the problem, asphalt mastic macadam (SMA) mixture is adopted as a paving material for the airport pavement. Compared with the dense mixed material, the SMA mixture has higher anti-rutting performance and water damage resistance. Because the surface of the composite material has larger structural depth, the SMA mixture provides excellent anti-skid performance for the airport pavement and provides guarantee for the safe operation of the airplane on the runway.

The prior literature reports patents related to the mixture of the asphalt mastic macadam include CN109231893A, CN108911591A, CN109231890A and the like. The asphalt mastic macadam mixture obtained by the technical scheme disclosed by the patents has low strength, and the dynamic stability of the asphalt mastic macadam mixture can reach more than 3000, so that the requirement of the anti-rutting performance of the pavement can be met, but the requirement of the anti-rutting performance of the pavement of an airport can not be met; finally, modified asphalt such as SBS modified asphalt, rubber powder modified asphalt and the like is used as cementing material, and the durability is difficult to meet the requirement under the action of high-temperature blowing corrosion of an airport. In order to meet the requirements of the strength and the durability of the airport pavement, modified asphalt with more excellent performance is required to be used as a cementing material to be applied to a mixture. The epoxy asphalt forms a spatial three-dimensional network high polymer after the curing reaction, has the characteristics of high bonding strength, small shrinkage rate, excellent heat resistance and the like, and can be used as a cementing material for preparing an epoxy asphalt mastic macadam mixture.

The prior documents report patents applied to the airport pavement epoxy asphalt mixture such as CN107386045A and CN 208455403U. These patents are mainly focused on the development of a tight-graded epoxy asphalt mix. Because the compact suspension structure mixture has small construction depth and small friction coefficient, the risk that the airplane rushes out of the runway under extreme conditions exists. Meanwhile, the curing of the epoxy asphalt is a progressive process, the repairing and paving time of the airport pavement is short, the newly repaired airport pavement is open to traffic in a short time, and the problems of insufficient early strength and wheel tracking resistance exist, which are all the problems that the dense-graded epoxy asphalt mixture cannot solve.

Disclosure of Invention

Aiming at the problems, the invention provides the epoxy asphalt mastic macadam mixture suitable for the airport pavement and the preparation method thereof, and the epoxy asphalt mastic macadam mixture has excellent load deformation resistance, high-temperature rutting resistance and strong water damage resistance.

In order to achieve the purpose, the asphalt mixture of the invention adopts epoxy asphalt as a cementing material. The epoxy asphalt forms a stable space network structure through the curing reaction of the epoxy resin and the curing component, is insoluble in any solvent, and continuously increases in viscosity along with the chemical reaction until the curing reaction is finished to form gel, so that the formed mixture has more excellent self-strength, high-temperature stability and low-temperature crack resistance. Meanwhile, the epoxy asphalt enhances the adhesiveness with aggregate, and is beneficial to improving the high-temperature stability and the water damage resistance of the asphalt mastic macadam mixture.

The technical scheme adopted by the invention is as follows:

an epoxy asphalt mastic macadam mixture suitable for airport pavement is prepared from the following raw materials in parts by mass: 0.7-2.1 parts of epoxy resin, 0.5-1.9 parts of curing component, 2.9-7.9 parts of SBS modified asphalt, 100-150 parts of mineral aggregate and 0.3-0.6 part of fiber.

According to a preferable technical scheme, the epoxy resin is bisphenol A type epoxy resin E-51, and the curing component is a modified amine curing agent.

As a preferable technical scheme, the mass ratio of the epoxy resin to the curing component is 0.8-1.6.

As a preferred technical scheme, the mass ratio of the epoxy resin, the curing component and the SBS modified asphalt to the mass of the mineral aggregate is 4.1-7.5%.

As a preferred technical scheme, the mineral aggregate is a mixture of coarse aggregate, fine aggregate and mineral powder.

As a preferred technical scheme, the mass part ratio of the coarse aggregate and the fine aggregate accords with discontinuous gradation, and the maximum nominal grain size of the discontinuous gradation can be selected from one of three gradations of SMA-16, SMA-13 and SMA-10 corresponding to 16mm, 13.2mm and 9.5 mm.

As a preferred technical scheme, the coarse aggregate is basalt macadam, the fine aggregate is basalt or limestone natural sand, and the mineral powder is limestone powder.

Preferably, the fiber is one of polyester fiber, lignin fiber or mineral fiber.

The preparation method of the epoxy asphalt mastic macadam mixture suitable for the airport pavement comprises the following steps:

(1) preheating coarse aggregate and fine aggregate determined according to the design gradation at 160-200 ℃, wherein the preheating time is 3-4 hours;

(2) preheating SBS modified asphalt at 160-180 ℃, and adding the SBS modified asphalt into the preheated coarse aggregate and the preheated fine aggregate in the step (1);

(3) uniformly mixing epoxy resin and a curing component, adding the mixture into the mixture obtained in the step (2), and stirring for 10-30 s;

(4) and (4) adding fibers and mineral powder into the mixture obtained in the step (3) and stirring the mixture for 10-30 s to obtain the epoxy asphalt mastic gravel mixture suitable for the airport pavement.

The invention has the beneficial effects that:

according to the invention, the SBS modified asphalt is adopted to replace the matrix asphalt to prepare the epoxy asphalt, the addition of SBS improves the viscosity of the epoxy asphalt in the curing process, obviously improves the compatibility of the asphalt and the epoxy resin, can inhibit the layered segregation of the epoxy asphalt in the curing process, and provides higher early strength, and the epoxy asphalt is used as a thermosetting material, provides higher strength and good high-temperature stability after curing, and can achieve the purpose of prolonging the service life of the airport pavement overlay. The mixture can effectively solve the problems of insufficient adhesiveness and insufficient strength of the common epoxy asphalt and the aggregate in the early curing stage, and can still maintain excellent stability, water stability, high-temperature stability and low-temperature crack resistance in the aspect of performance.

The aggregate of the invention is prepared by mixing coarse aggregate and fine aggregate, and has more coarse aggregate content and less fine aggregate content. The high-stability high-deformation-resistance structural framework is formed by interlocking the coarse aggregates with high content, the fine aggregates, mineral powder, epoxy asphalt and asphalt mastic formed by fiber stabilizers bond the framework together and fill the gaps of the framework, so that the mixture can ensure good early-stage anti-rutting performance and anti-sliding capacity, and has good flexibility and durability.

The epoxy asphalt mastic macadam mixture suitable for the airport pavement and the preparation method thereof have the advantages of simple preparation process, convenience in operation, suitability for pavement of the airport pavement, consideration of early performance and long-term performance, capability of effectively prolonging the service life of an airport overlaying layer and good economic value in the life cycle.

Detailed Description

The present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the present invention, and modifications, equivalent variations and modifications made to the above examples according to the technical spirit of the present invention are within the technical scope of the present invention.