Modified cement stabilized macadam and preparation method thereof

Abstract

The application relates to the technical field of road materials, in particular to modified cement-stabilized macadam and a preparation method thereof.The modified cement-stabilized macadam comprises the following components in parts by weight: aggregate: 100 parts, water: 1.5-4 parts, cement: 2.5-6.5 parts, fiber: 1-3 parts and thickening agent: 1-3 parts.The application reduces the cement dosage by adding the thickening agent hydrophobically modified hydroxyethyl cellulose, the polymer has more significant viscosity and shear stability, can enhance the viscosity of the cement, improve the viscosity and fluidity of the cement, make the cement have cohesiveness and plasticity, add the fiber to build a fiber skeleton, and further enhance the compression resistance and crack resistance coefficient of the modified cement-stabilized macadam.The application first proposes to apply chitin fiber to the modification of the cement-stabilized macadam and achieves remarkable effects, is beneficial to the development and popularization of the chitin fiber, simultaneously promotes the modification direction of the cement-stabilized macadam and the development of the asphalt road based on the cement-stabilized macadam.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road materials, in particular to a modified cement stabilized macadam and a preparation method thereof. BACKGROUND

[0002] With the continuous development of China's transportation infrastructure, the rapid development of multiple fields such as highways, railways, aviation and the continuous improvement of transportation service level, China has become a truly transportation power, and is rapidly moving towards the goal of a transportation power.

[0003] Since the mid-1980s, the highway traffic volume and the proportion of heavy vehicles in China have been increasing, and the increase of road traffic load has caused the rapid deterioration of road service life. As the load-bearing layer of the pavement, the base needs to have good bearing capacity to ensure that the pavement structure is not damaged under the action of road load. After the 1990s, semi-rigid base asphalt pavement is widely used in China, especially in the construction process of high-grade highways, influenced by the idea of "strong base and thin surface", semi-rigid base is widely used. Semi-rigid base not only has the advantages of high strength and good plate body, but also the mechanical indexes such as strength and modulus of semi-rigid base will increase with age, so that semi-rigid base has large rigidity. Using semi-rigid material as the pavement base can reduce the pavement deflection and reduce the tensile stress at the bottom of the asphalt layer, thereby achieving the effect of thinning the asphalt surface layer and saving cost. However, the disadvantages of semi-rigid base are also obvious. It is found in actual engineering that the semi-rigid base asphalt pavement has serious cracking problem. Some roads will produce reflection cracks within 1-2 years after completion. The main reason for the production of reflection cracks is that semi-rigid base material is easy to produce dry shrinkage and temperature shrinkage stress when subjected to external environmental changes, especially temperature and humidity changes, which causes the base to crack. These stresses will concentrate at the crack tip, causing the crack to develop towards the surface layer, eventually penetrating the entire pavement structure, forming reflection cracks and seriously damaging the road performance. Cement stabilized macadam is one of the most widely used semi-rigid base materials.

[0004] Therefore, the cement stabilized macadam of the prior art needs to be further improved to improve the crack resistance of the cement stabilized macadam and prolong the service life of the semi-rigid base asphalt pavement. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a modified cement stabilized macadam and a preparation method thereof.

[0006] The technical scheme provided by the present application is as follows:

[0007] In a first aspect, the present application provides a modified cement stabilized macadam, comprising the following components by weight: aggregate: 100 parts, water 1.5-4 parts, cement 2.5-6.5 parts, fiber 1-3 parts, thickening agent 1-3 parts.

[0008] On the basis of the above technical scheme, the aggregate comprises coarse aggregate and fine aggregate.

[0009] Further, the coarse aggregate includes three diameter classifications, respectively 19mm-31.5mm, 9.5mm-19mm, and 4.75mm-9.5mm; the coarse aggregate accounts for 75%-95%, which is very important for the performance of the cement stabilized macadam mixture. For the cement stabilized macadam, the maximum particle size of the coarse aggregate must be limited, because the large particle size of the aggregate will cause the segregation of the mixture, so that the strength of the base layer cannot be satisfied, and in severe cases, the base layer will crack. At the same time, the larger the particle size, the more difficult the construction; but the smaller the particle size of the aggregate, the more difficult the production; both cases will increase the project cost, so it is very important to reasonably select the particle size and ratio of the aggregate.

[0010] Further, the fine aggregate includes two diameter classifications, respectively 2.75mm-4.75mm and 0mm-2.75mm. The fine aggregate is mainly filled in the voids of the coarse aggregate, and affects the compactness of the mixture skeleton, so the surface of the fine aggregate is required to be clean, high in hardness and obvious in corners.

[0011] On the basis of the above technical scheme, the cement is any one of ordinary Portland cement, slag Portland cement, and pozzolanic Portland cement. Preferably, the cement is ordinary Portland cement, which has high strength and small dry shrinkage coefficient.

[0012] Cement is a powdery inorganic hydraulic cementitious material. The slurry made by adding water to cement can firmly bond sand, stone and other materials to form a structure with certain strength, and is an indispensable material in cement stabilized macadam. The greater the amount of cement used, the better the bonding effect of the cementitious material, but the greater the risk of cracks in the cement stabilized macadam base material.

[0013] The present application adds hydroxyethyl cellulose to improve the viscosity and fluidity of cement, thereby reducing the amount of cement and improving the crack resistance of the cement stabilized macadam.

[0014] On the basis of the above technical scheme, the fiber is any one or more of basalt fiber, polyester enol fiber, glass fiber powder, UHMWPE, and chitin fiber. Further, the fiber length is 20-25mm. The incorporation of fiber into the cement stabilized macadam material can improve the mechanical properties and crack resistance to a certain extent, and different types of fiber may have different effects.

[0015] The fibers overlap each other to form a fiber framework, which supports the cement stabilized macadam from inside, thereby reducing cracks of the cement stabilized macadam caused by dry shrinkage and temperature shrinkage of the cement.

[0016] The chitin fiber is extracted from crab shell and has high strength and elongation, and contains a large amount of amino groups, and has high solubility and biological activity. The chitin fiber has a relatively small structure compared with other fibers, and when the chitin fiber is used in combination with other fibers, the chitin fiber can fill the gaps in the framework of the other fibers, and a more compact and solid fiber framework system is constructed to enhance the compression resistance and crack resistance of the modified cement stabilized macadam. In addition, the chitin fiber has biological activity, degradability and water absorption, and has a good effect on the maintenance and maintenance of the asphalt road in the later period, especially the water absorption, which can effectively damage the base layer of the asphalt road when heavy rain comes.

[0017] On the basis of the above technical scheme, the thickening agent is any one of carboxymethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose. Further preferably, the hydroxyethyl cellulose is hydrophobically modified hydroxyethyl cellulose.

[0018] Hydrophobically modified cellulose is a kind of water-soluble cellulose derivative with "amphiphilic structure" in which a small amount of hydrophobic groups are introduced into the molecular chain. In the present application, the long-chain hydrophobic stubbornness of bromododecane (BD) is introduced into hydroxyethyl cellulose to synthesize hydrophobically modified hydroxyethyl cellulose. Compared with general water-soluble cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, this kind of polymer has more significant viscosity and shear stability, can enhance the viscosity of cement, improve the viscosity and fluidity of cement, make cement have cohesiveness and plasticity, make the combination between cement and aggregate and fiber and other raw materials more compact, and enhance the compression resistance and crack resistance coefficient of modified cement stabilized macadam.

[0019] Further, the preparation method of the hydrophobically modified hydroxyethyl cellulose is as follows:

[0020] S1: hydroxyethyl cellulose and isopropyl alcohol are added to a container, stirred, and nitrogen is introduced;

[0021] S2: slowly drop the activator solution;

[0022] S3: after the hydroxyethyl cellulose is swelled for 24 hours, the temperature is raised to the reaction temperature, and BD (bromododecane) dissolved in a proper amount of isopropyl alcohol is slowly added to obtain a reaction solution;

[0023] S4: the reaction solution obtained in S3 is filtered, washed and soaked with n-hexane and acetone to remove residual reactants, neutralized to pH 7-8 with dilute hydrochloric acid, and filtered;

[0024] S5: drying in a vacuum oven at 45℃ for 6h to obtain the product hydrophobically modified hydroxyethyl cellulose.

[0025] In a second aspect, the present application further provides a preparation method of the modified cement stabilized macadam, the preparation method comprising the following steps:

[0026] S1, preliminary mixing: mixing and stirring the aggregate and the fiber until uniform to obtain a preliminary mixture;

[0027] S2, secondary mixing: mixing and stirring the water, the cement and the thickening agent in the preliminary mixture obtained in S1 until uniform to obtain the modified cement stabilized macadam.

[0028] In a third aspect, the present application further provides an asphalt pavement comprising a material layer laid on a base material of the modified cement stabilized macadam obtained by the modified cement stabilized macadam of the first aspect or the preparation method of the second aspect.

[0029] The present application has the following advantages:

[0030] 1. The modified cement stabilized macadam provided by the present application can reduce the amount of cement by adding the thickening agent hydrophobically modified hydroxyethyl cellulose, and the polymer has more significant viscosity and shear stability, which can enhance the viscosity of the cement, improve the viscosity and fluidity of the cement, make the cement have cohesiveness and plasticity, and make the cement and the aggregate and the fiber and other raw materials more closely combined, thereby enhancing the compression and crack resistance of the modified cement stabilized macadam.

[0031] 2. The modified cement stabilized macadam provided by the present application can further enhance the compression and crack resistance of the modified cement stabilized macadam by adding the fiber to build a fiber skeleton.

[0032] 3. The present application first proposes to apply chitin fiber to the modification of cement stabilized macadam, which has achieved remarkable results, is beneficial to the development and popularization of chitin fiber, and promotes the modification direction of cement stabilized macadam and the development of asphalt road based on cement stabilized macadam. DETAILED DESCRIPTION

[0033] The present application will be further described in detail in combination with examples and comparative examples:

[0034] The raw materials used in the examples of the present application can be obtained by market purchase, wherein the hydroxyethyl cellulose is purchased from Shanghai Yuanye Biological Technology Co., Ltd.; the polyvinyl alcohol, glass fiber powder, basalt fiber and UHMWPE are purchased from Shanghai Yinan Chemical Technology Co., Ltd.; the chitin fiber is purchased from Zhejiang Zhouhua Biological Technology Development Co., Ltd.; and the cement is purchased from Foshan Sanshui Sanhu Cement Co., Ltd.

[0035] The methods not described in detail in the present application are all known operation methods of those skilled in the art.

[0036] Example 1:

[0037] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 4 parts, cement 6.5 parts; the aggregate 100 parts is respectively coarse aggregate 75 parts and fine aggregate 25 parts; the cement is ordinary Portland cement.

[0038] Example 2:

[0039] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 4 parts, cement 6.5 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement.

[0040] Example 3:

[0041] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 4 parts, cement 6.5 parts; the aggregate 100 parts is respectively coarse aggregate 95 parts and fine aggregate 5 parts; the cement is ordinary Portland cement.

[0042] Example 4:

[0043] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 4 parts, cement 6.5 parts, thickening agent 1 part; the aggregate 100 parts is respectively coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose.

[0044] The preparation method of the hydrophobically modified hydroxyethyl cellulose is as follows:

[0045] S1: hydroxyethyl cellulose and isopropyl alcohol are added in a container, stirred, and nitrogen is passed;

[0046] S2: slowly drop the activator solution;

[0047] S3: after the hydroxyethyl cellulose is swelled for 24 hours, the temperature is raised to the reaction temperature, and BD (bromododecane) dissolved in a proper amount of isopropyl alcohol is slowly added for reaction to obtain a reaction liquid;

[0048] S4: the reaction liquid obtained in S3 is filtered, and soaked with n-hexane and acetone for washing to remove residual reactants, and is neutralized to pH 7-8 with dilute hydrochloric acid and filtered;

[0049] S5: dried in a vacuum oven at 45℃ for 6 hours to obtain the product hydrophobically modified hydroxyethyl cellulose.

[0050] Example 5:

[0051] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 3 parts, cement 4 parts, thickening agent 2 parts; the aggregate 100 parts comprises coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement; and the thickening agent is hydrophobically modified hydroxyethyl cellulose.

[0052] The hydrophobically modified hydroxyethyl cellulose is prepared according to the method of Example 4.

[0053] Example 6:

[0054] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 2 parts; the aggregate 100 parts comprises coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose; and the fiber is polyvinyl alcohol fiber.

[0055] The hydrophobically modified hydroxyethyl cellulose is prepared according to the method of Example 4.

[0056] Example 7:

[0057] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 2 parts; the aggregate 100 parts comprises coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose; and the fiber is polyvinyl alcohol fiber.

[0058] Example 8:

[0059] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 2 parts; the aggregate 100 parts comprises coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose; and the fiber is glass fiber powder.

[0060] Example 9:

[0061] A modified cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 2 parts; the aggregate 100 parts comprises coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose; and the fiber is basalt fiber.

[0062] Example 10:

[0063] A modified cement stabilized macadam, comprising the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 2 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose. The preparation method of the hydrophobically modified hydroxyethyl cellulose is the same as that in Example 4. The fiber is UHMWPE (ultra-high molecular weight polyethylene fiber).

[0064] Example 11:

[0065] A modified cement stabilized macadam, comprising the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 2 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose. The preparation method of the hydrophobically modified hydroxyethyl cellulose is the same as that in Example 4. The fiber is chitin fiber.

[0066] Example 12:

[0067] A modified cement stabilized macadam, comprising the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 3 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose. The preparation method of the hydrophobically modified hydroxyethyl cellulose is the same as that in Example 4. The fiber is polyvinyl alcohol fiber 2 parts, chitin fiber 1 part.

[0068] Example 13:

[0069] A modified cement stabilized macadam, comprising the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 3 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose. The preparation method of the hydrophobically modified hydroxyethyl cellulose is the same as that in Example 4. The fiber is glass fiber powder 2 parts, chitin fiber 1 part.

[0070] Example 14:

[0071] A modified cement stabilized macadam, comprising the following components in parts by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 3 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose. The preparation method of the hydrophobically modified hydroxyethyl cellulose is the same as that in Example 4. The fiber is basalt fiber 2 parts, chitin fiber 1 part.

[0072] Example 15

[0073] A modified cement stabilized macadam, comprising the following components in parts by weight, aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 3 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose. The preparation method of the hydrophobically modified hydroxyethyl cellulose is the same as that of Example 4. The fiber is UHMWPE 2 parts, chitin fiber 1 part.

[0074] Comparative Example 1

[0075] A modified cement stabilized macadam, comprising the following components in parts by weight, aggregate 100 parts, water 1.5 parts, cement 2.5 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement.

[0076] Comparative Example 2

[0077] A modified cement stabilized macadam, comprising the following components in parts by weight, aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 3 parts; the aggregate 100 parts is respectively coarse aggregate 85 parts, fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydroxyethyl cellulose. The preparation method of the hydrophobically modified hydroxyethyl cellulose is the same as that of Example 4. The fiber is UHMWPE 2 parts, chitin fiber 1 part.

[0078] Performance detection test

[0079] For the modified cement stabilized macadam prepared in Examples 1-15 and Comparative Examples 1, the following performance detection was carried out. The performance detection includes the unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient of the modified cement stabilized macadam, and the detection data is shown in Table 1.

[0080] 1. Unconfined compressive strength

[0081] The unconfined compressive strength of the prepared modified cement stabilized macadam was detected according to the detection standard of national standard JTG 3430-2020 "Highway Geotechnical Test Procedures". Detection environment: 25℃.

[0082] 2. Indirect tensile strength

[0083] The indirect tensile strength of the prepared modified cement stabilized macadam was detected according to the detection standard of national standard JTG E51-2009 "Highway Engineering Inorganic Binder Stabilized Material Test Procedures". Detection environment: 25℃.

[0084] 3. Dry shrinkage coefficient

[0085] The shrinkage of the prepared cement stabilized macadam mixture is detected according to the detection standard of the national standard GB / T 29417-2012 “Test method for drying shrinkage and cracking performance of cement mortar and concrete”. The detection environment is 25°C.

[0086] 4. Temperature shrinkage coefficient

[0087] The shrinkage of the prepared cement stabilized macadam mixture is detected according to the detection standard of the national standard GB / T 29417-2012 “Test method for drying shrinkage and cracking performance of cement mortar and concrete”. The detection environment is 25°C.

[0088] Table 1 Performance detection data table

[0089]

[0090] The following describes the effects of the embodiments of the present application in combination with the detection data in Table 1.

[0091] According to the analysis of the data in Table 1, the performance indicators of the modified cement stabilized macadam prepared in Examples 1-15 are all better than those of Comparative Example 1, which indicates that the modified cement stabilized macadam prepared in the present application performs better in terms of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient.

[0092] The ratio of coarse aggregate and fine aggregate in Examples 1-3 is compared and optimized, and the results show that the ratio of 85 parts of coarse aggregate and 15 parts of fine aggregate in Example 2 performs better in terms of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient.

[0093] Based on the prepared Example 2 and Comparative Example 1, the effects of thickening agents are studied in Examples 4-6. The experimental data show that the comprehensive performance of Example 6 is better than that of Examples 4-6. Example 6 uses 2.5 parts of cement, 1.5 parts of water and 3 parts of thickening agent, and the amount of cement is the least, but the comprehensive performance is the best. Compared with the data of Comparative Example 1, the effect of adding a thickening agent and adding a thickening agent is significant under the same amount of water and cement.

[0094] Based on Example 6 and for comparison, 2 parts of different fibers are added in Examples 7-11 respectively to study the effect of different fibers on the unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient of cement stabilized macadam. The experimental data show that the comprehensive performance of Example 10 adding 2 parts of UHMWPE is the best, followed by Example 7 adding polyvinyl alcohol fiber, Example 8 adding glass fiber, Example 9 adding basalt fiber and Example 11 adding chitin fiber. The comprehensive performance of Examples 7-11 is better than that of Example 6, indicating that the effect of adding different fibers is better than that of not adding fibers, and the effect of adding 2 parts of UHMWPE is better.

[0095] Based on Example 10 adding 2 parts of UHMWPE as a control, Examples 12-15 all add 1 part of chitin fiber on the basis of Examples 7-10, and the effect of chitin fiber on the unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient of modified cement stabilized macadam is studied. The experimental data show that after adding chitin fiber, the comprehensive performance of Examples 12-15 is significantly better than that of Examples 7-10. This shows that although chitin fiber alone has a general effect on modifying cement stabilized macadam, chitin fiber can play a very outstanding effect when used in combination with other fibers. The combination of chitin fiber and UHMWPE in Example 15 has the best effect on the unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient of modified cement stabilized macadam.

[0096] Based on Example 15, Comparative Example 2 is set up to explore the effect difference of hydrophobically modified hydroxyethyl cellulose and hydroxyethyl cellulose as thickening agent. The experimental data show that the use of hydroxyethyl cellulose in Comparative Example 2 still has a good effect on the unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient of modified cement stabilized macadam; but compared with Example 15, obviously the hydrophobically modified hydroxyethyl cellulose used in Example 15 has a more excellent effect on the unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient of modified cement stabilized macadam. This shows that hydrophobically modified hydroxyethyl cellulose is a better choice.

[0097] The application has been described above by way of example, but the application is not limited to the above specific examples, and any modification or variation made on the basis of the application falls within the scope of the application.

Claims

1. A modified cement stabilized macadam, characterized by, The components include the following components by weight: aggregate 100 parts, water 1.5 parts, cement 2.5 parts, thickening agent 3 parts, fiber 3 parts; The aggregate includes coarse aggregate 85 parts and fine aggregate 15 parts; the cement is ordinary Portland cement; the thickening agent is hydrophobically modified hydroxyethyl cellulose; the fiber includes UHMWPE 2 parts and chitin fiber 1 part; The preparation method of the hydrophobically modified hydroxyethyl cellulose is as follows: S1: adding hydroxyethyl cellulose and isopropyl alcohol in a container, stirring, and passing nitrogen; S2: slowly adding an activator solution; S3: after the hydroxyethyl cellulose is swelled for 24 hours, the temperature is raised to the reaction temperature, and a BD reaction solution dissolved in an appropriate amount of isopropyl alcohol is slowly added to obtain a reaction solution; S4: filtering the reaction solution obtained in S3, and washing and soaking with n-hexane and acetone to remove residual reactants, and neutralizing to pH 7-8 with dilute hydrochloric acid, and filtering; S5: drying in a vacuum oven at 45℃ for 6 hours to obtain the product hydrophobically modified hydroxyethyl cellulose.

2. The modified cement stabilized macadam according to claim 1, characterized in that, The coarse aggregate includes three diameter classifications, 19mm-31.5mm, 9.5mm-19mm, and 4.75mm-9.5mm; and the fine aggregate includes two diameter classifications, 2.75mm-4.75mm and 0mm-2.75mm.

3. An asphalt pavement, characterized by It includes a material layer laid by the modified cement stabilized macadam of any one of claims 1-2 as a base material.

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