An alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavement, its preparation method and application

Abstract

The present invention relates to the field of pavement materials, and specifically discloses an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements, its preparation method and application. The alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements is made from raw materials including an alkali-magnesium cement base material, cationic emulsified asphalt, hydroxyethylidene diphosphonate, filler and water. The raw materials of the alkali-magnesium cement base material include the following components in parts by weight: 289.3-309.4 parts of magnesium oxide, and 140.6-160.7 parts of magnesium sulfate. The weight part ratio of the dosage of hydroxyethylidene diphosphonate to the dosage of magnesium oxide is (1.45-1.55: 289.3-309.4). The toughness of the alkali-magnesium cement-based emulsified asphalt semi-flexible pavement material of the present invention is further improved, and it is not easy to crack, further improving the service life and safety performance of the road.

Description

Technical Field

[0001] The present invention relates to the field of pavement materials, and more specifically, to an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements, a preparation method thereof, and an application thereof. Background Art

[0002] At present, pavement materials in China are mainly divided into two categories: cement concrete and asphalt concrete. As a rigid material, cement concrete is characterized by high strength, good durability and stability, and no aging. However, its cost is high, it has a large impact on the environment, and it is inconvenient for later maintenance. Asphalt concrete is a flexible pavement structure and is a relatively environmentally friendly material; it has the advantages of seamless joints, low pollution, and convenient maintenance. However, its temperature sensitivity is relatively high. In a high-temperature environment, ruts and potholes are likely to form on the asphalt concrete pavement, reducing the driving safety; and asphalt concrete is prone to brittle cracking in a low-temperature environment, resulting in cracks on the pavement, affecting driving comfort and safety.

[0003] In order to overcome the disadvantages of the two and give play to their advantages, cement-emulsified asphalt concrete appears in everyone's field of vision as a composite material. It has semi-flexibility and combines the characteristics of cement concrete and asphalt concrete in terms of mechanical properties. Different from traditional cement concrete and asphalt concrete: on the one hand, the addition of emulsified asphalt reduces the elastic modulus of cement concrete and improves its anti-deformation ability; on the other hand, the addition of cement improves the temperature sensitivity of asphalt mixture and increases its compressive strength. Therefore, cement-emulsified asphalt mortar is widely used as a cushioning material between the track slab and the concrete base of the ballastless track of high-speed railways, which plays a role in ensuring the driving safety and comfort of trains. In the field of asphalt pavement cold recycling technology, cement-emulsified asphalt mortar is an important cold recycling material, which has the advantages of short construction time, low resource consumption, and small impact on the ecological environment, and is an energy-saving and environmental protection material in the new century.

[0004] At present, the rigid material in widely used semi-flexible pavement materials is portland cement. However, when semi-flexible pavement materials use cement and asphalt as binders, during use, there are problems such as poor toughness and the bonding strength at the "asphalt-cement mortar" interface inside being unable to resist the shrinkage stress of cement-based materials, resulting in cracking phenomena. Furthermore, the semi-flexible pavement is prone to cracking phenomena, greatly reducing the service life and safety performance of the road. Summary of the Invention

[0005] In order to solve the problems that existing semi-flexible pavement materials have poor toughness and the bonding strength at the "asphalt-cement mortar" interface inside is unable to resist the shrinkage stress of cement-based materials, resulting in cracking phenomena, and further to improve the problem that the semi-flexible pavement is prone to cracking, the present invention provides an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements, a preparation method thereof, and an application thereof.

[0006] In a first aspect, the present invention provides an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements, adopting the following technical solutions:

[0007] An alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements is made from raw materials including an alkali-magnesium cement base material, cationic emulsified asphalt, hydroxyethylidene diphosphonate, filler, and water; the raw materials of the alkali-magnesium cement base material include the following components by weight parts: 289.3 - 309.4 parts of magnesium oxide, 140.6 - 160.7 parts of magnesium sulfate; the weight part ratio of the dosage of hydroxyethylidene diphosphonate to the dosage of magnesium oxide is (1.45 - 1.55: 289.3 - 309.4).

[0008] By adopting the above technical solutions, for existing semi-flexible pavements, most use portland cement as the cement-based material. The inventor's research found that due to the poor toughness and large shrinkage of portland cement, the deformation coordination between the rigid and flexible materials in the semi-flexible pavement is weak, resulting in the cracking phenomenon that the bonding strength of the "asphalt-cement mortar" interface inside the semi-flexible pavement cannot resist the shrinkage stress of the cement-based material under the influence of the external environmental temperature and traffic load, greatly reducing the service life and safety performance of the road. Therefore, the inventor first uses an alkali-magnesium cement base material to replace the portland cement base material, thereby using the toughness and expansion properties of alkali-magnesium cement to improve problems such as cracking caused by the cement-based material.

[0009] However, for the use of alkali-magnesium cement in semi-flexible pavements, there is no relevant application in this field for the time being. And directly adding conventional alkali-magnesium cement to semi-flexible pavement materials cannot well improve the problem of pavement cracking. Therefore, the inventor developed and designed an alkali-magnesium cement base material for semi-flexible pavements, using specified dosages of magnesium oxide and magnesium sulfate to form the alkali-magnesium cement base material. On the one hand, the alkali-magnesium cement of the present invention is combined with cationic emulsified asphalt. Cationic emulsified asphalt can effectively wrap the unreacted active magnesium oxide particles, preventing the unreacted magnesium oxide from continuing to react to form expansive brucite under humid or water-soaked conditions. In addition, cationic emulsified asphalt can cause the internal pores of the alkali-magnesium cement to form closed pores, thereby effectively preventing external moisture from entering the interior of the alkali-magnesium cement solidified body, thus improving the water resistance of the alkali-magnesium cement base. On the other hand, alkali-magnesium cement is a whisker self-reinforced cement-based material. The alkali-magnesium cement of the present invention can form stable basic magnesium sulfate whiskers in the system of the present invention, and its high toughness can improve the problem of poor toughness of conventional cement-based materials in semi-flexible pavements.

[0010] At the same time, in order to make the alkali-magnesium cement applicable to semi-flexible pavements, the inventor added hydroxyethylidene diphosphonate; the addition of hydroxyethylidene diphosphonate, on the one hand, the multi-coordination bonds of hydroxyethylidene diphosphonate will combine with the ionized Mg 2+Complexation reactions occur, and these Mg-containing 2+ complexes will form in large quantities on the surface of MgO. These Mg-containing 2+ complexes provide in-situ sites for the continuously ionized Mg 2+ on the surface of MgO. Due to the high adsorption of chelating and coordination bonds in the admixture, Mg 2+ can be uniformly dispersed on the particle surface to form complexes. This significantly reduces the formation of Mg(OH)2 precipitation, thereby reducing the expansion of the cement matrix. Thus, in the system of the present invention, hydroxyethylidene diphosphonic acid can adjust the alkaline magnesium cement to a suitable slightly expanded state, enabling the cement and mortar to be fully combined, thereby improving the cracking phenomenon caused by the inability of the bond strength at the "bitumen-cement mortar" interface to resist the shrinkage stress of the cement-based material and enhancing the strength of the mortar. On the other hand, the use of hydroxyethylidene diphosphonic acid helps [(MgOH)(H2O)] + to directly react with Mg 2+ , SO4 2- and OH - to form stable basic magnesium sulfate whiskers, thereby effectively improving the performance of magnesium oxysulfate cement; moreover, the formed complexes on the surface of magnesium oxide can improve the water resistance of magnesium oxysulfate cement and extend the service life of semi-flexible pavements. And compared with Portland cement, the use of the alkaline magnesium cement in the present invention gives the materials of the present invention the advantage of rapid setting.

[0011] Thus, the toughness of the alkaline magnesium cement-based emulsified asphalt semi-flexible pavement material of the present invention is further improved, and it has good strength and is not prone to cracking, further enhancing the service life and safety performance of the road.

[0012] Furthermore, the hydroxyethylidene diphosphate includes at least one of sodium salt and potassium salt. The filler is river sand, and the weight ratio of the filler dosage to the magnesium oxide dosage is (1150 - 1550:289.3 - 309.4), and the particle size of the river sand is 0.35 - 0.5 mm. The weight ratio of the water dosage to the magnesium oxide dosage is (81 - 135:289.3 - 309.4). The weight ratio of the cationic emulsified asphalt dosage to the magnesium oxide dosage is (45 - 135:289.3 - 309.4).

[0013] Still further, the raw materials include the following components by weight:

[0014] 289.3 - 309.4 parts of magnesium oxide, 140.6 - 160.7 parts of magnesium sulfate, 45 - 135 parts of cationic emulsified asphalt, 1.45 - 1.55 parts of hydroxyethylidene diphosphonic acid, 1150 - 1550 parts of filler, and 81 - 135 parts of water.

[0015] In a second aspect, the present invention provides a method for preparing an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements, adopting the following technical solution:

[0016] A method for preparing an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements includes the following steps:

[0017] Mix magnesium oxide and magnesium sulfate evenly to obtain a dry powder; add sodium hydroxymethylethylenediphosphonate to water and dissolve it to obtain a sodium hydroxymethylethylenediphosphonate solution; add the sodium hydroxymethylethylenediphosphonate solution to the dry powder, mix evenly, then add cationic emulsified asphalt and filler, and stir evenly to obtain an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements.

[0018] In a third aspect, the present application also provides an application of an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements in semi-flexible pavements, adopting the following technical solution:

[0019] Apply the above alkali-magnesium cement-based emulsified asphalt mortar to semi-flexible pavements. Using a construction method similar to that of conventional semi-flexible pavement materials, after pouring the above alkali-magnesium cement-based emulsified asphalt mortar, compared with general semi-flexible pavement materials that require 28 days of natural curing, the present invention can be opened to traffic after 7 days of natural curing.

[0020] In summary, the present invention has the following beneficial effects:

[0021] 1. Through the self-formulation of alkali-magnesium cement and the combined use of sodium hydroxymethylethylenediphosphonate, the present invention enables alkali-magnesium cement to be successfully used in semi-flexible pavements. It not only enables alkali-magnesium cement to form stable magnesium sulfate hydroxide whiskers with good toughness, but also can adjust alkali-magnesium cement to a suitable slightly expanded state, improving the cracking phenomenon caused by the fact that the bond strength at the "asphalt-cement mortar" interface cannot resist the shrinkage stress of cement-based materials.

[0022] 2. The use of hydroxymethylethylenediphosphonate in the present invention helps [(MgOH)(H2O)] + to directly combine with Mg 2+ , SO4 2- and OH - to form stable magnesium sulfate hydroxide whiskers, thereby effectively improving the mechanical properties of magnesium oxysulfate cement; at the same time, the formed complex can improve the water resistance of magnesium oxysulfate cement on the surface of magnesium oxide, extending the service life of semi-flexible pavements. Description of the Drawings

[0023] Figure 1 is the electron micrograph of the mortar in Example 2.

[0024] Figure 2 is the electron micrograph of the mortar in Comparative Example 9. Detailed Embodiments

[0025] The present invention will be further described in detail below in conjunction with embodiments.

[0026] Embodiment

[0027] A magnesium - alkali cement - based emulsified asphalt mortar for semi - flexible pavement is made from raw materials including magnesium - alkali cement base material, cationic emulsified asphalt, hydroxyethylidene diphosphonate, filler, and water.

[0028] Among them, the raw materials of the magnesium - alkali cement base material include the following components by weight parts: 289.3 - 309.4 parts of magnesium oxide, and 140.6 - 160.7 parts of magnesium sulfate.

[0029] The hydroxyethylidene diphosphate includes at least one of sodium salt and potassium salt, and the weight - part ratio of the dosage of hydroxyethylidene diphosphonate to the dosage of magnesium oxide is (1.45 - 1.55:289.3 - 309.4).

[0030] The filler is river sand, the weight - part ratio of the filler dosage to the magnesium oxide dosage is (1150 - 1550:289.3 - 309.4), and the particle size of the river sand is 0.35 - 0.5 mm.

[0031] The weight - part ratio of the water dosage to the magnesium oxide dosage is (81 - 135:289.3 - 309.4).

[0032] The weight - part ratio of the cationic emulsified asphalt dosage to the magnesium oxide dosage is (45 - 135:289.3 - 309.4).

[0033] Specifically, the raw materials include the following components by weight parts:

[0034] 289.3 - 309.4 parts of magnesium oxide, 140.6 - 160.7 parts of magnesium sulfate, 45 - 135 parts of cationic emulsified asphalt, 1.45 - 1.55 parts of hydroxyethylidene diphosphonate, 1150 - 1550 parts of filler, and 81 - 135 parts of water.

[0035] The following will be illustrated through specific examples.

[0036] Embodiment 1

[0037] Embodiment 1 discloses a magnesium - alkali cement - based emulsified asphalt mortar for semi - flexible pavement, which is made from raw materials including magnesium - alkali cement base material, cationic emulsified asphalt, hydroxyethylidene diphosphonate, filler, and water. Among them, the raw materials of the magnesium - alkali cement base material include magnesium oxide and magnesium sulfate. The hydroxyethylidene diphosphonate is sodium salt.

[0038] The specific raw material contents of the magnesium - alkali cement - based emulsified asphalt mortar for semi - flexible pavement are as follows:

[0039] 300 g of magnesium oxide, 150 g of magnesium sulfate, 45 g of cationic emulsified asphalt, 1.5 g of hydroxyethylidene diphosphonate, 1350 g of river sand, 117 g of water.

[0040] Example 1 also provides a method for preparing an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavement, which includes the following steps: Mix magnesium oxide and magnesium sulfate, and place them in a mixer for dry mixing for 2 minutes to obtain a uniformly mixed dry powder. Add sodium hydroxyethylidene diphosphonate to water and dissolve it for 3 minutes to prepare a sodium hydroxyethylidene diphosphonate solution. Then add the sodium hydroxyethylidene diphosphonate solution to the dry powder, mix and stir for 3 minutes at a rotation speed of 80 revolutions per minute, and then add emulsified asphalt and river sand, and continue to stir for 5 minutes to obtain an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavement.

[0041] Examples 2-7

[0042] The differences between Examples 2-7 and Example 1 are: the contents of each raw material component are different, as shown in Table 1 specifically.

[0043] Table 1 Raw material table of Examples 1-7 (unit: g)

[0044]

[0045]

[0046] Application Examples

[0047] Application Examples 1-7 provide a semi-flexible pavement, and the semi-flexible pavement is constructed respectively using the alkali-magnesium cement-based emulsified asphalt mortar in Examples 1-7. The construction thickness of the semi-flexible pavement mortar is 10-15 cm, and it is cured naturally for 7 days and then can be opened to traffic.

[0048] Comparative Examples

[0049] The differences between Comparative Examples 1-7 and the Examples are: the dosages of raw materials in Comparative Examples 1-7 are different from those in the Examples, as shown in Table 2 specifically.

[0050] Table 2 Raw material table of Comparative Examples 1-7 (unit: g)

[0051]

[0052] Comparative Example 8

[0053] Comparative Example 8 provides a conventional semi-flexible pavement mortar, which includes the following components:

[0054] 450 g of portland cement, 1350 g of river sand, 135 g of water, 90 of cationic emulsified asphalt.

[0055] The preparation method of the above mortar is as follows: Portland cement of type 425# is used. Preparation method: Mix the Portland cement and river sand for 5 minutes, then add water and cationic emulsified asphalt and mix to obtain the semi-flexible pavement mortar commonly available on the market.

[0056] Comparative Example 9

[0057] The difference between Comparative Example 9 and Example 2 is that glucose is used to replace hydroxyethylidene diphosphonate.

[0058] Comparative Example 10

[0059] Comparative Example 10 provides a conventional semi-flexible pavement mortar, including the following components: 450 g of Portland cement of 425#, 1350 g of river sand, 135 g of water, 90 g of cationic emulsified asphalt, and 1.5 g of hydroxyethylidene diphosphonate.

[0060] Performance testing

[0061] The compressive strength is tested mechanically by the method of the standard for test methods of mechanical properties of concrete GB / T 50081 - 2002, and the performance of the mortar in the examples and comparative examples is detected. The results are shown in Table 3.

[0062] The detection method of the strength retention coefficient is as follows: Immerse the specimens cured for 28 days in water for 28 days, then take them out, dry the surface moisture, and test their compressive strength after standing for 1 d. Calculate the strength retention coefficient R according to formula (1) f .

[0063]

[0064] In the formula, R(w,28) is the compressive strength after being immersed in water for 28 d, MPa; R(a,28) is the compressive strength after natural curing for 28 d, MPa.

[0065] Table 3 Performance detection table of examples and comparative examples

[0066]

[0067]

[0068] According to the performance test results of Example and Comparative Example 8, it can be seen that the magnesium oxychloride cement-based emulsified asphalt mortar in the embodiments of the present invention has good compressive strength and flexural strength, and the flexural-compressive ratio and strength retention coefficient are also very excellent, with good toughness and water resistance. By adopting appropriate means, the present invention successfully composes a magnesium oxychloride cement-based material with a specified amount of magnesium oxide and magnesium sulfate, so that the final mortar can be successfully applied to semi-flexible pavements. The coating effect of the cationic emulsified asphalt in the present invention on the magnesium oxychloride cement particles hinders the unreacted magnesium oxide from continuing to react to form expansive brucite under humid or water-soaked conditions. In addition, the addition of hydroxyethylidene diphosphonate can reduce the formation of Mg(OH)2 precipitation, thereby reducing the expansion of the cement matrix. Therefore, in the system of the present invention, hydroxyethylidene diphosphonate can adjust the magnesium oxychloride cement to a suitable slightly expanded state, thereby improving the cracking phenomenon caused by the fact that the bond strength of the "bitumen-cement mortar" interface inside the pavement cannot resist the shrinkage stress of the cement-based material, so that the mortar has good compressive strength and flexural strength. On the other hand, the use of hydroxyethylidene diphosphonate helps + to directly combine with Mg 2+ , SO4 2- and OH - to form stable basic magnesium sulfate whiskers, which can effectively improve the toughness of magnesium oxysulfate cement. Furthermore, after the mortar of the present invention is used in semi-flexible pavements, it can improve the cracking phenomenon caused by the fact that the bond strength of the "bitumen-cement mortar" interface inside the pavement cannot resist the shrinkage stress of the cement-based material.

[0069] Specifically, by analyzing the performance of Examples 1-3, it is found that as the dosage of cationic emulsified asphalt increases, although the flexural-compressive ratio increases, the mechanical properties of the mortar show a downward trend; on the one hand, it shows that the use of cationic emulsified asphalt can indeed improve the toughness of the mortar and improve the water resistance of the mortar through the coating effect on the magnesium oxychloride cement particles. However, excessive use of cationic emulsified asphalt will cause a decrease in the strength of the mortar.

[0070] Analysis of the performance of Examples 3-5 reveals that as the dosage of hydroxyethylidene diphosphonic acid increases, the strength of the mortar shows a downward trend, and the flexural-compressive ratio of the mortar also decreases. At the same time, by combining the performance of Comparative Example 6, it can be found that when hydroxyethylidene diphosphonic acid is used in excess, both the flexural-compressive ratio and the strength retention coefficient of Comparative Example 6 decrease. Further analysis of the performance of Comparative Examples 1-5 shows that without using hydroxyethylidene diphosphonic acid, the compressive strength, flexural strength, flexural-compressive ratio, and strength retention coefficient of Comparative Examples 1-5 all decrease significantly. This indicates that the lack of hydroxyethylidene diphosphonic acid cannot regulate the expansion state of magnesium oxychloride cement and cannot promote the formation of stable basic magnesium sulfate whiskers in magnesium oxychloride cement. Moreover, the dosage of hydroxyethylidene diphosphonic acid is very important. The addition of an appropriate amount of hydroxyethylidene diphosphonic acid can adjust magnesium oxychloride cement to a suitable slightly expanded state and form stable basic magnesium sulfate whiskers, making the mortar have both toughness and strength.

[0071] Further analysis of the performance of Comparative Examples 1-5 shows that since Comparative Examples 1-2 did not use asphalt, their strength performance is slightly better than that of Comparative Examples 3-5. According to the rules of Examples and Comparative Examples 1-6 and the rule that the strength of Comparative Examples 1-2 is slightly better than that of Comparative Examples 3-5, it can be known that although the addition of a large amount of cationic emulsified asphalt can increase the toughness of the mortar, it will cause a decrease in the strength of the mortar. However, the addition of hydroxyethylidene diphosphonic acid in the present invention enables the mortar to have good strength and good toughness.

[0072] Regarding the use of hydroxyethylidene diphosphonic acid, further analysis of the performance of Comparative Example 9 shows that after glucose is added to the mortar system instead of hydroxyethylidene diphosphonic acid, although glucose can also produce a chelating effect, the performance of the mortar also decreases significantly. And Figure 1 and Figure 2 by comparison, it can be seen that hydroxyethylidene diphosphonic acid is more conducive to - forming stable basic magnesium sulfate whiskers. Hydroxyethylidene diphosphonic acid cooperates with other components of the mortar system in the present invention to ultimately achieve the purpose of improving the mortar performance. At the same time, by combining the performance of Example 2 and Comparative Example 10, it can be found that although the dosage of cement dry material and water in Comparative Example 10 has changed to a certain extent compared with Example 2, Comparative Example 10 uses a silicate cement base material in a conventional semi-flexible pavement to equivalently replace the magnesium oxychloride cement base material used in the present invention. Observing the performance results, it can be seen that the performance of Comparative Example 10 has decreased significantly compared with Example 2, indicating that hydroxyethylidene diphosphonic acid does not produce a similar effect with silicate cement, thus showing worse mortar performance.

[0073] Analysis of the performance of Comparative Example 7 reveals that when the magnesium oxide and magnesium sulfate in the alkali magnesium cement are not formulated in a suitable ratio, the performance of the alkali magnesium cement-based emulsified asphalt mortar deteriorates. This indicates that for the stable formation of basic magnesium sulfate whiskers, the full cooperation of alkali magnesium cement and hydroxyethylidene diphosphonate is required to achieve.

[0074] The above specific embodiments are merely explanations of the present invention and are not limitations thereof. Those skilled in the art can make modifications to the above embodiments without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. Application of an alkali-magnesium cement-based emulsified asphalt mortar in a semi-flexible pavement, characterized in that: The alkali-magnesium cement-based emulsified asphalt mortar is made from raw materials including alkali-magnesium cement base material, cationic emulsified asphalt, hydroxyethylidene diphosphonate, filler and water; the raw materials of the alkali-magnesium cement base material include the following components by weight: 289.3 - 309.4 parts of magnesium oxide, 140.6 - 160.7 parts of magnesium sulfate; the weight ratio of the dosage of hydroxyethylidene diphosphonate to the dosage of magnesium oxide is (1.45 - 1.55: 289.3 - 309.4); the weight ratio of the dosage of cationic emulsified asphalt to the dosage of magnesium oxide is (45 - 135: 289.3 - 309.4); the weight ratio of the dosage of filler to the dosage of magnesium oxide is (1150 - 1550: 289.3 - 309.4); the filler is river sand; the weight ratio of the dosage of water to the dosage of magnesium oxide is (81 - 135: 289.3 - 309.4).

2. Application of an alkali-magnesium cement-based emulsified asphalt mortar according to claim 1 in a semi-flexible pavement, characterized in that: The hydroxyethylidene diphosphate includes at least one of sodium salt and potassium salt.

3. Application of an alkali-magnesium cement-based emulsified asphalt mortar in a semi-flexible pavement according to claim 1, characterized in that: The particle size of the river sand is 0.35 - 0.5 mm.

4. Application of an alkali-magnesium cement-based emulsified asphalt mortar in a semi-flexible pavement according to claim 1, characterized in that: The raw materials of the alkali-magnesium cement-based emulsified asphalt mortar include the following components by weight: 289.3 - 309.4 parts of magnesium oxide, 140.6 - 160.7 parts of magnesium sulfate, 45 - 135 parts of cationic emulsified asphalt, 1.45 - 1.55 parts of hydroxyethylidene diphosphonate, 1150 - 1550 parts of filler, 81 - 135 parts of water.

5. Application of an alkali-magnesium cement-based emulsified asphalt mortar according to claim 1 in a semi-flexible pavement: The preparation method of the alkali-magnesium cement-based emulsified asphalt mortar includes the following steps: Mix magnesium oxide and magnesium sulfate evenly to obtain a dry powder; add sodium hydroxyethylidene diphosphonate to water and dissolve to obtain a sodium hydroxyethylidene diphosphonate solution; add the sodium hydroxyethylidene diphosphonate solution to the dry powder, mix evenly, then add cationic emulsified asphalt and filler, and stir evenly to obtain the alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavement.

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