A low-temperature high-fluidity magnesium phosphate cement-based material and its preparation method and application

Abstract

The present invention relates to the technical field of magnesium phosphate cement, and specifically discloses a low-temperature high-fluidity magnesium phosphate cement-based material and a preparation method and application thereof. The cement-based material comprises the following components: 75-90 parts by weight of magnesium phosphate cement, 3-8 parts by weight of retarder, 5-10 parts by weight of hydroxyapatite, 0.2-0.5 parts by weight of phenol, 0.5-1.0 parts by weight of gluconate, and 10-15 parts by weight of water. Wherein; the modified hydroxyapatite is formed by hydroxyapatite particles with phenol loaded on the surface. The scheme of the present invention can enable the magnesium phosphate cement-based material to maintain good fluidity under low temperature and low water-binder ratio conditions, and can also form good early strength, effectively overcoming the problem of conflict between mechanical properties and working performance of magnesium phosphate cement under low temperature conditions.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium phosphate cement, and in particular to a low-temperature high-fluidity magnesium phosphate cement-based material and a preparation method and application thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] The environment of cement concrete pavement in cold regions is usually harsh. Concrete pavement will be brittle due to snowmelt erosion and low temperature, making it more vulnerable to damage, with potholes, exposed surfaces, cracks and other damages. If these defects are not repaired in time in winter, the freeze-thaw cycle in spring will further aggravate the damage to the concrete pavement.

[0004] Magnesium phosphate cement is a new type of cementitious material composed of dead-burned magnesium oxide, ammonium dihydrogen phosphate or potassium dihydrogen phosphate, and retarder. It has the characteristics of large hydration heat release, rapid hardening and early strength, and high bonding strength. It is one of the most effective cementitious materials for repairing in low-temperature environments. However, under low-temperature conditions, if the water-binder ratio of normal-temperature magnesium phosphate cement is still used, it is easy for the free water in the cement paste to freeze quickly, resulting in the inability to fully hydrate the cement, which in turn leads to a significant reduction in the strength of magnesium phosphate cement.

[0005] To this end, the water-binder ratio and retarder dosage of magnesium phosphate cement are usually reduced at the same time, but this will lead to poor fluidity of magnesium phosphate cement. In addition, the hydration and hardening rate of magnesium phosphate cement is fast, and it is easy to lose fluidity, which will make it difficult to evenly distribute and fill the area that needs to be repaired, affecting the bonding strength between the repair layer and the original concrete, resulting in hollowing and peeling between the two. Therefore, magnesium phosphate cement has obvious conflicts between mechanical properties and working performance under low temperature conditions. Summary of the invention

[0006] In view of the above problems, the present invention provides a low-temperature high-fluidity magnesium phosphate cement-based material and a preparation method and application thereof, which can enable the magnesium phosphate cement-based material to maintain good fluidity under low temperature and low water-binder ratio conditions and form good early strength. Specifically, the technical solution of the present invention is as follows.

[0007] In the first aspect, the present invention discloses a low-temperature high-fluidity magnesium phosphate cement-based material, the raw materials of which include the following components: 75-90 parts by weight of magnesium phosphate cement, 3-8 parts by weight of retarder, 5.2-10.5 parts by weight of modified hydroxyapatite, 0.5-1.0 parts by weight of gluconate, and 10-15 parts by weight of water. The modified hydroxyapatite is formed by hydroxyapatite particles with phenol loaded on the surface.

[0008] Furthermore, the ratio of hydroxyapatite to phenol is 5-10 parts by weight: 0.2-0.5 parts by weight.

[0009] Furthermore, the magnesium phosphate cement comprises phosphate and magnesium oxide. Optionally, the ratio of the dihydrogen phosphate to magnesium oxide is 15-20 parts by weight: 60-70 parts by weight.

[0010] Furthermore, the phosphate includes at least one of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, etc.

[0011] Further, the magnesium oxide comprises dead-burned magnesium oxide. Optionally, the fineness of the magnesium oxide is ≥ 200 mesh.

[0012] Furthermore, the retarder includes at least one of borax, triethanolamine, zinc sulfate and the like.

[0013] Furthermore, the fineness of the hydroxyapatite particles is 200-300 meshes.

[0014] Furthermore, the gluconate includes at least one of sodium gluconate, calcium gluconate, and the like.

[0015] In a second aspect, the present invention discloses a method for preparing the low-temperature and high-fluidity magnesium phosphate cement-based material, comprising the following steps:

[0016] (1) The hydroxyapatite and phenol are mixed and ground, and then the obtained powder is evenly mixed with the water to obtain an additive slurry.

[0017] (2) The magnesium phosphate cement, retarder and gluconate are mixed evenly, and then the admixture slurry is added and mixed evenly to obtain the magnesium phosphate cement-based material.

[0018] Furthermore, in step (1), the grinding treatment time is 2 to 2.5 hours.

[0019] In a third aspect, the present invention discloses the application of the low-temperature and high-fluidity magnesium phosphate cement-based material in construction engineering, road engineering, bridge engineering, etc.

[0020] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0021] The magnesium phosphate cement material of the present invention is added with an admixture formed by hydroxyapatite, gluconate and phenol, so that the magnesium phosphate cement can maintain good fluidity and form good early strength under low temperature and low water-binder ratio conditions. This is because: first, the gluconate dissolves in water in the initial stage of the reaction and reacts with the Mg released by the magnesium phosphate cement. 2+ The formation of unstable complexes hinders the hydration of magnesium phosphate cement, so that the magnesium phosphate cement maintains good fluidity in the initial stage of the reaction. Secondly, the present invention mixes hydroxyapatite and phenol and then grinds them, so that phenol is adsorbed on the surface of hydroxyapatite, hinders the crystal nucleation of hydroxyapatite in the initial stage of hydration, delays the function of hydroxyapatite, and prevents the decrease of fluidity. As the hydration reaction of magnesium phosphate cement proceeds, the phosphate in the magnesium phosphate cement releases H + Increase, the phenol on the surface of hydroxyapatite and H + The reaction occurs, causing phenol to separate from the surface of hydroxyapatite and enter the liquid phase of the magnesium phosphate cement system. At this time, the hydroxyapatite is exposed in the magnesium phosphate cement, which can act as a crystal nucleus to promote the hydration of the magnesium phosphate cement and accelerate the formation of hydration products, thereby forming good early strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 This is a sample of a low-temperature, high-fluidity magnesium phosphate cement-based material prepared in the following Example 1.

[0024] Figure 2 The following is a flow test diagram of Example 1.

[0025] Figure 3 The following is a compressive strength test diagram of Example 1.

[0026] Figure 4 The following is a graph showing the interface bending tensile strength test of Example 1.

[0027] Figure 5 The tensile bonding strength test diagram of the following Example 1 is shown. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples without specifying specific conditions are usually carried out under conventional conditions or under conditions recommended by the manufacturer.

[0029] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meanings as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in a conventional manner in the art or in accordance with the product instructions.

[0030] In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention. The technical solution of the present invention is further described in conjunction with the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0033] (1) Take the following raw materials: 80 parts by weight of magnesium phosphate cement, 5 parts of retarder, 5 parts by weight of hydroxyapatite particles, 1 part by weight of gluconate, 0.4 parts by weight of phenol, and 13 parts by weight of water. The magnesium phosphate cement is formed by 60 parts by weight of dead-burned magnesium oxide with a fineness of 300 mesh and 20 parts by weight of ammonium dihydrogen phosphate powder with a fineness of 120 mesh. The fineness of the hydroxyapatite particles is 200 mesh. The retarder is borax, and the gluconate is sodium gluconate.

[0034] (2) Grind the hydroxyapatite and phenol in a planetary ball mill for 2 hours. After grinding, mix the obtained powder with the water and stir evenly to obtain an admixture slurry for later use.

[0035] (3) The magnesium phosphate cement, retarder and gluconate are mixed and stirred for 3 minutes to obtain a mixed powder. Then the admixture slurry is added to the mixed powder, and then stirred at a rate of 145 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material, such as Figure 1 shown.

[0036] Performance test: (1) According to JC / T2537-2019 "Magnesium phosphate repair mortar", the low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested (such as Figure 2 (2) According to JC / T2537-2019 "Magnesium Phosphate Repair Mortar", the early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment were tested at a low temperature of -10°C, as shown respectively. Figure 3 , Figure 4 , Figure 5 The test results are shown in the following table, and it can be seen that the magnesium phosphate cement-based material prepared in this embodiment has good fluidity / workability and early mechanical properties under low temperature and low water-cement ratio conditions:

[0037] .

[0038] Example 2

[0039] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0040] (1) Take the following raw materials: 90 parts by weight of magnesium phosphate cement, 8 parts of retarder, 10 parts by weight of hydroxyapatite particles, 0.8 parts by weight of gluconate, 0.5 parts by weight of phenol, and 15 parts by weight of water. The magnesium phosphate cement is formed by 70 parts by weight of dead-burned magnesium oxide with a fineness of 220 mesh and 20 parts by weight of potassium dihydrogen phosphate powder with a fineness of 100 mesh. The fineness of the hydroxyapatite particles is 300 mesh. The retarder is borax, and the gluconate is sodium gluconate.

[0041] (2) Grind the hydroxyapatite and phenol in a planetary ball mill for 2.5 hours. After grinding, mix the obtained powder with the water and stir evenly to obtain an admixture slurry for later use.

[0042] (3) The magnesium phosphate cement, retarder and gluconate are mixed and stirred for 3 minutes to obtain a mixed powder. The admixture slurry is then added to the mixed powder, and then stirred at a rate of 145 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material.

[0043] Performance test: (1) The low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". (2) The early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment were tested at -10°C according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". The test results are shown in the following table. It can be seen that the magnesium phosphate cement-based material prepared in this embodiment has good fluidity / workability and early mechanical properties under low temperature and low water-cement ratio conditions:

[0044] .

[0045] Example 3

[0046] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0047] (1) Take the following raw materials: 75 parts by weight of magnesium phosphate cement, 3 parts of retarder, 5 parts by weight of hydroxyapatite particles, 0.5 parts by weight of gluconate, 0.2 parts by weight of phenol, and 13 parts by weight of water. The magnesium phosphate cement is formed by 60 parts by weight of dead-burned magnesium oxide with a fineness of 220 mesh, 10 parts by weight of ammonium dihydrogen phosphate with a fineness of 150 mesh, and 5 parts by weight of sodium dihydrogen phosphate powder with a fineness of 150 mesh. The fineness of the hydroxyapatite particles is 300 mesh. The retarder is triethanolamine, and the gluconate is calcium gluconate.

[0048] (2) Grind the hydroxyapatite and phenol in a planetary ball mill for 2 hours. After grinding, mix the obtained powder with the water and stir evenly to obtain an additive slurry for later use.

[0049] (3) The magnesium phosphate cement, retarder and gluconate are mixed and stirred for 2 minutes to obtain a mixed powder. The admixture slurry is then added to the mixed powder, and then stirred at a rate of 140 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material.

[0050] Performance test: (1) The low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". (2) The early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment were tested at -10°C according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". The test results are shown in the following table. It can be seen that the magnesium phosphate cement-based material prepared in this embodiment has good fluidity / workability and early mechanical properties under low temperature and low water-cement ratio conditions:

[0051] .

[0052] Example 4

[0053] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0054] (1) Take the following raw materials: 80 parts by weight of magnesium phosphate cement, 5 parts by weight of retarder, 5 parts by weight of hydroxyapatite particles, 0.4 parts by weight of phenol, 1 part by weight of gluconate, and 13 parts by weight of water. The magnesium phosphate cement is formed by 60 parts by weight of dead-burned magnesium oxide with a fineness of 300 mesh and 20 parts by weight of ammonium dihydrogen phosphate powder with a fineness of 120 mesh. The fineness of the hydroxyapatite particles is 200 mesh. The retarder is borax, and the gluconate is sodium gluconate.

[0055] (2) The magnesium phosphate cement, retarder, hydroxyapatite, gluconate and phenol are placed in a planetary ball mill and ground for 2 hours. After grinding, the obtained powder is mixed with the water, and then stirred at a rate of 145 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material.

[0056] Performance test: (1) The low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". (2) The early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment were tested at -10°C according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". The test results are shown in the following table. It can be seen that the performance of the magnesium phosphate cement-based material is reduced due to the lack of surface modification of hydroxyapatite with phenol in advance:

[0057] .

[0058] Example 5

[0059] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0060] (1) Take the following raw materials: 90 parts by weight of magnesium phosphate cement, 8 parts by weight of borax, and 15 parts by weight of water. The magnesium phosphate cement is formed by 70 parts by weight of dead-burned magnesium oxide with a fineness of 220 mesh and 20 parts by weight of potassium dihydrogen phosphate powder with a fineness of 100 mesh.

[0061] (2) The magnesium phosphate cement and borax are mixed and stirred for 3 minutes to obtain a mixed powder. The mixed powder is then mixed with water, and then stirred at a rate of 145 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material.

[0062] Performance test: (1) According to JC / T2537-2019 "Magnesium Phosphate Repair Mortar", the low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested. (2) According to JC / T2537-2019 "Magnesium Phosphate Repair Mortar", the early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment at -10°C were tested. The test results are shown in the following table. It can be seen that the performance of the magnesium phosphate cement-based material is greatly reduced due to the lack of addition of hydroxyapatite and gluconate modified by phenol:

[0063] .

[0064] Example 6

[0065] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0066] (1) Take the following raw materials: 75 parts by weight of magnesium phosphate cement, 3 parts of retarder, 5 parts by weight of hydroxyapatite particles, 0.5 parts by weight of gluconate, and 13 parts by weight of water. The magnesium phosphate cement is formed by 60 parts by weight of dead-burned magnesium oxide with a fineness of 220 mesh, 10 parts by weight of ammonium dihydrogen phosphate with a fineness of 150 mesh, and 5 parts by weight of sodium dihydrogen phosphate powder with a fineness of 150 mesh. The fineness of the hydroxyapatite particles is 300 mesh. The retarder is triethanolamine, and the gluconate is calcium gluconate.

[0067] (2) Grind the hydroxyapatite in a planetary ball mill for 2 hours. After grinding, mix the obtained powder with the water and stir evenly to obtain an admixture slurry for later use.

[0068] (3) The magnesium phosphate cement, retarder and gluconate are mixed and stirred for 2 minutes to obtain a mixed powder. The admixture slurry is then added to the mixed powder, and then stirred at a rate of 140 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material.

[0069] Performance test: (1) The low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". (2) The early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment at -10°C were tested according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". The test results are shown in the following table. It can be seen that the performance of the magnesium phosphate cement-based material is reduced due to the lack of surface modification of hydroxyapatite with phenol:

[0070] .

[0071] Example 7

[0072] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0073] (1) Take the following raw materials: 90 parts by weight of magnesium phosphate cement, 8 parts of retarder, 0.5 parts by weight of phenol, 0.8 parts by weight of gluconate, and 15 parts by weight of water. The magnesium phosphate cement is formed by 70 parts by weight of dead-burned magnesium oxide with a fineness of 220 mesh and 20 parts by weight of potassium dihydrogen phosphate powder with a fineness of 100 mesh. The retarder is borax, and the gluconate is sodium gluconate.

[0074] (2) Mix the phenol and water and stir them evenly to obtain an admixture for later use.

[0075] (3) The magnesium phosphate cement, retarder and gluconate are mixed and stirred for 3 minutes to obtain a mixed powder. The admixture is then added to the mixed powder, and then stirred at a rate of 145 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material.

[0076] Performance test: (1) The low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". (2) The early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment at -10°C were tested according to JC / T2537-2019 "Magnesium Phosphate Repair Mortar". The test results are shown in the following table. It can be seen that the performance of the magnesium phosphate cement-based material is reduced due to the lack of hydroxyapatite:

[0077] .

[0078] Example 8

[0079] A method for preparing a low-temperature and high-fluidity magnesium phosphate cement-based material comprises the following steps:

[0080] (1) Take the following raw materials: 90 parts by weight of magnesium phosphate cement, 8 parts by weight of borax, and 20 parts by weight of water. The magnesium phosphate cement is formed by 70 parts by weight of dead-burned magnesium oxide with a fineness of 220 mesh and 20 parts by weight of potassium dihydrogen phosphate powder with a fineness of 100 mesh.

[0081] (2) The magnesium phosphate cement and borax are mixed and stirred for 3 minutes to obtain a mixed powder. The mixed powder is then mixed with water, and then stirred at a rate of 145 r / min for 1 minute and then at a rate of 280 r / min for 2 minutes to obtain a magnesium phosphate cement-based material.

[0082] Performance test: (1) According to JC / T2537-2019 "Magnesium Phosphate Repair Mortar", the low-temperature fluidity of the magnesium phosphate cement-based material prepared in this embodiment was tested. (2) According to JC / T2537-2019 "Magnesium Phosphate Repair Mortar", the early compressive strength, early interfacial flexural strength and early tensile bonding strength of the magnesium phosphate cement-based material prepared in this embodiment at -10°C were tested. The test results are shown in the following table. It can be seen that due to the lack of addition of hydroxyapatite and gluconate modified by phenol, coupled with the high water-cement ratio, the performance of the magnesium phosphate cement-based material is greatly reduced:

[0083] .

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-temperature and high-fluidity magnesium phosphate cement-based material, characterized in that: The raw materials of the cement-based material include the following components: 75-90 parts by weight of magnesium phosphate cement, 3-8 parts by weight of retarder, 5.2-10.5 parts by weight of modified hydroxyapatite, 0.5-1.0 parts by weight of gluconate, and 10-15 parts by weight of water; in; The modified hydroxyapatite is formed by hydroxyapatite particles with phenol loaded on the surface.

2. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 1, characterized in that: The ratio of the hydroxyapatite to the phenol is 5-10 parts by weight: 0.2-0.5 parts by weight.

3. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 1, characterized in that: The magnesium phosphate cement comprises dihydrogen phosphate and magnesium oxide.

4. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 3, characterized in that: The ratio of the dihydrogen phosphate to magnesium oxide is 15-20 parts by weight: 60-70 parts by weight.

5. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 3, characterized in that: The dihydrogen phosphate includes at least one of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, and sodium dihydrogen phosphate.

6. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 3, characterized in that: The magnesium oxide includes dead-burned magnesium oxide.

7. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 3, characterized in that: The fineness of the magnesium oxide is ≥200 meshes.

8. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 1, characterized in that: The retarder includes at least one of borax, triethanolamine and zinc sulfate.

9. The low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 1, characterized in that: The gluconate includes at least one of sodium gluconate and calcium gluconate.

10. The low-temperature and high-fluidity magnesium phosphate cement-based material according to any one of claims 1 to 9, characterized in that: The fineness of the hydroxyapatite particles is 200-300 meshes.

11. The method for preparing the low-temperature and high-fluidity magnesium phosphate cement-based material according to any one of claims 1 to 10, characterized in that: The steps include: (1) mixing the hydroxyapatite and phenol and grinding them, and then mixing the obtained powder with the water to obtain an admixture slurry; (2) The magnesium phosphate cement, retarder and gluconate are mixed evenly, and then the admixture slurry is added and mixed evenly to obtain the magnesium phosphate cement-based material.

12. The method for preparing the low-temperature and high-fluidity magnesium phosphate cement-based material according to claim 11, characterized in that: In step (1), the grinding treatment time is 2 to 2.5 hours.

13. Use of the low-temperature, high-fluidity magnesium phosphate cement-based material according to any one of claims 1 to 10, or the low-temperature, high-fluidity magnesium phosphate cement-based material obtained by the preparation method according to any one of claims 11 or 12 in construction engineering, road engineering or bridge engineering.

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