Anti-fatigue ballastless track concrete under high geothermal environment and preparation method of anti-fatigue ballastless track concrete

Abstract

The invention discloses anti-fatigue ballastless track concrete in a high geothermal environment and a preparation method thereof, and belongs to the technical field of building materials. The concrete is prepared from the following raw materials in parts by weight: 350 to 400 parts of Portland cement, 50 to 100 parts of rock-based mineral admixture, 900 to 1200 parts of coarse aggregate, 600 to 800 parts of fine aggregate, 5 to 15 parts of fiber reinforced component, 6 to 10 parts of working performance regulating material and 120 to 150 parts of water, the preparation method comprises the following steps: (1) weighing the raw materials; (2) adding the Portland cement, the rock-based mineral admixture, the coarse aggregate, the fine aggregate and the fiber-reinforced component, and stirring; and (3) adding the working performance regulation and control material and water, and stirring. According to the method, the fatigue life of the ballastless track concrete under the normal temperature condition is prolonged, the fatigue damage of the ballastless track concrete under the high ground temperature condition is obviously delayed, and the method has a wide application prospect in the ballastless track under the high ground temperature environment.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and more specifically to a fatigue-resistant ballastless track concrete for high geothermal environments and its preparation method. Background Technology

[0002] High geothermal environments are one of the main service environment types faced by ballastless track concrete structures in tunnels of high-speed railways in central and western my country and in rugged mountainous areas. As railway construction in my country expands into the central and western regions and rugged mountainous areas, some ballastless track concrete structures in high geothermal tunnels face severe geothermal effects. Simultaneously, high-speed railway ballastless track concrete also bears the cyclic loads from high-speed train operation. Previous studies have shown that under high geothermal environments, the fatigue life of ballastless track concrete decreases significantly; the number of fatigue cycles at 60℃ decreases by more than 30% compared to 20℃, indicating that high geothermal activity has a significant adverse impact on the fatigue life of ballastless track concrete.

[0003] The standard "CRTSIII Type Slab Track for Ballastless Track" (TBT 3579-2022) provides detailed specifications for the raw materials, preparation, and curing processes of slab track. However, in some central and western regions and rugged mountainous areas, the distribution of traditional concrete mineral admixtures such as fly ash, slag powder, and silica fume is uneven, and external procurement and transportation are difficult. Concrete with low or no mineral admixtures exhibits significant deficiencies in fatigue performance. Invention patent ZL 2024 1 1046192.X proposes using basalt fiber cement to improve the impact fatigue resistance of concrete, but basalt fiber has a high overall cost and cannot address the fundamental issue of reduced fatigue resistance in concrete under high geothermal conditions. Invention patent ZL 2022 1 1203874.8 proposes using hybrid fibers to enhance the fatigue resistance of concrete, but the fatigue performance of fiber-modified concrete also remains insufficient under high geothermal conditions. Invention patent CN202511240897.X proposes using resin compounding and fiber modification to improve the fatigue performance of concrete sleepers. However, the use of organic materials for modification may lead to a decrease in the elastic modulus of concrete, which has an adverse effect on the load transfer of the ballastless track structure. Therefore, under the condition of limited resources, developing a fatigue-resistant ballastless track concrete that can adapt to high geothermal temperatures is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide fatigue-resistant ballastless track concrete and its preparation method under high geothermal conditions, so as to improve and ensure the service life of ballastless track concrete track slabs under high geothermal conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fatigue-resistant ballastless track concrete for high geothermal environments comprises the following raw materials in parts by weight: 350-400 parts of silicate cement, 50-100 parts of rock-based mineral admixtures, 900-1200 parts of coarse aggregate, 600-800 parts of fine aggregate, 5-15 parts of fiber reinforcement, 6-10 parts of workability regulating material, and 120-150 parts of water.

[0006] Furthermore, the thermal expansion coefficient of the parent rock of the aforementioned rock-based mineral admixture is <8.0×10⁻⁶. -6 / ℃.

[0007] The further beneficial effect of adopting the above is that the rock-based mineral admixture is a powder material that meets the requirements and is made from the same source of parent rock as the coarse and fine aggregates. When the admixture is prepared from parent rock with a low coefficient of thermal expansion, the coefficient of thermal expansion of the slurry matrix can be reduced, the temperature deformation under high geothermal conditions can be reduced, and the fatigue resistance can be improved.

[0008] Furthermore, the aforementioned coarse aggregate is coarse aggregate that has undergone silica solution impregnation treatment; the thermal expansion coefficient of the parent rock of the coarse aggregate is <8.0×10⁻⁶. -6 / ℃; the mass fraction of the silica solution is 3%-5%; the impregnation time is <12h.

[0009] The further beneficial effect of the above-mentioned method is that the parent rock of coarse aggregate has a low coefficient of thermal expansion, which can reduce aggregate expansion and microcracks in the interfacial transition zone under high geothermal conditions. Silica solution impregnation can strengthen the interfacial transition zone and extend the service life of concrete under fatigue loading.

[0010] Furthermore, the aforementioned fine aggregate is manufactured sand from the same source as the coarse aggregate and rock-based mineral admixtures, with a stone powder content of <5%, obtained through direct processing of the parent rock or through crushing of the coarse aggregate.

[0011] The further beneficial effect of adopting the above is that using fine aggregates with low thermal expansion coefficients can reduce fatigue damage to concrete under fatigue loads in high geothermal environments.

[0012] Furthermore, the aforementioned fiber reinforcement component is a basalt hybrid fiber, including coarse basalt fiber rods and fine basalt fiber rods, with a mass ratio of (5-8):(2-5).

[0013] Furthermore, the coarse basalt fiber rods mentioned above are 20-30 mm long and 0.5-1 mm in diameter; the fine basalt fiber rods are 5-8 mm long and 0.1-0.2 mm in diameter.

[0014] The further beneficial effect of adopting the above-mentioned method is that basalt hybrid fibers can enhance the dispersion performance of powder materials and improve their density.

[0015] Furthermore, the aforementioned performance-regulating material is a high-performance polycarboxylate superplasticizer with a water reduction rate >32%.

[0016] The further beneficial effects of using the above-mentioned high-performance polycarboxylate superplasticizer are that it can enhance the dispersion performance of powder materials, reduce the water consumption of concrete, and improve the density.

[0017] A method for preparing fatigue-resistant ballastless track concrete under high geothermal conditions, specifically including the following steps: (1) Weigh each raw material according to the weight proportions of the fatigue-resistant ballastless track concrete under the above-mentioned high geothermal environment; (2) First add silicate cement, rock-based mineral admixture, coarse aggregate, fine aggregate and fiber reinforcement components, and mix; (3) Add performance-regulating materials and water, stir, and you will get fatigue-resistant ballastless track concrete under high geothermal conditions.

[0018] Furthermore, in step (2) above, the stirring time is 30 seconds.

[0019] Furthermore, in step (3) above, the stirring time is >3 min.

[0020] The further beneficial effect of adopting the above-mentioned method is that TB 3275 stipulates that the mixing time of railway concrete should not be less than 2 minutes. Based on this, the present invention appropriately extends the mixing time to >3 minutes, which can enhance the uniformity of concrete mixing.

[0021] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: The concrete of this invention not only improves the fatigue life of ballastless track concrete for high-speed railways under normal temperature conditions, but also significantly delays the fatigue damage of ballastless track concrete under high geothermal conditions. It is widely applicable to fatigue-resistant ballastless track concrete structures for high-speed railways in high geothermal environments. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1 Fatigue-resistant ballastless track concrete under high geothermal conditions comprises the following raw materials by weight: 400 kg of silicate cement, 50 kg of rock-based mineral admixtures, 1000 kg of coarse aggregate, 800 kg of fine aggregate, 6 kg of coarse basalt fiber rods, 4 kg of fine basalt fiber rods, 8 kg of high-performance polycarboxylate superplasticizer, and 138 kg of water. The silicate cement is PO 42.5 silicate cement (Beijing Jinyu) that meets the requirements of GB / 175-2007. The rock-based mineral admixture meets the requirements of "Rock-based Mineral Admixture for Railway Tunnel Mulch" (T / CRS P1501-2025), with a parent rock thermal expansion coefficient of 7.5 × 10⁻⁶. -6 / ℃; The coarse aggregate is limestone coarse aggregate impregnated with silica solution, meeting the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 7.5×10⁻⁶. -6 / ℃, the mass fraction of the silica solution is 3%, and the impregnation time is 18h; The fine aggregate is limestone fine aggregate from the same source as the coarse aggregate, meeting the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 7.5×10⁻⁶. -6 / ℃, stone powder content 4.5%, obtained through coarse aggregate crushing; The coarse basalt fiber rod (Sichuan Aerospace Tuoda Basalt Fiber Co., Ltd.) is 20mm in length and 0.5mm in diameter; The fine basalt fiber rods (Sichuan Aerospace Tuoda Basalt Fiber Co., Ltd.) are 5mm in length and 0.1mm in diameter. The high-performance polycarboxylate superplasticizer is PCEA-1 viscosity-reducing polycarboxylate superplasticizer (Jiangsu Subote New Material Co., Ltd.), with a water reduction rate of 32% and a solid content of 20%. The water is ordinary tap water; The preparation method of fatigue-resistant ballastless track concrete under high geothermal conditions specifically includes the following steps: (1) Weigh each raw material according to the weight of the fatigue-resistant ballastless track concrete under the above-mentioned high geothermal environment; (2) First add silicate cement, rock-based mineral admixture, coarse aggregate, fine aggregate, coarse basalt fiber rod and fine basalt fiber rod, and stir for 30 seconds; (3) Add high-performance polycarboxylate superplasticizer and water, stir for 180s, and you will get fatigue-resistant ballastless track concrete under high geothermal environment.

[0024] Example 2 Fatigue-resistant ballastless track concrete under high geothermal conditions comprises the following raw materials by weight: 380 kg of silicate cement, 80 kg of rock-based mineral admixtures, 1100 kg of coarse aggregate, 650 kg of fine aggregate, 9 kg of coarse basalt fiber rods, 6 kg of fine basalt fiber rods, 6.5 kg of high-performance polycarboxylate superplasticizer, and 136 kg of water. The silicate cement is PO 42.5 silicate cement (Beijing Jinyu) that meets the requirements of GB / 175-2007. The rock-based mineral admixture meets the requirements of "Rock-based Mineral Admixture for Railway Tunnel Mulch" (T / CRS P1501-2025), with a parent rock thermal expansion coefficient of 7.2 × 10⁻⁶. -6 / ℃; The coarse aggregate is limestone coarse aggregate impregnated with silica solution, meeting the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 7.2×10⁻⁶. -6 / ℃, the mass fraction of the silica solution is 4%, and the impregnation time is 24h; The fine aggregate is limestone fine aggregate from the same source as the coarse aggregate, meeting the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 7.2×10⁻⁶. -6 / ℃, stone powder content 4.8%, obtained through coarse aggregate crushing; The coarse basalt fiber rod (Sichuan Aerospace Tuoda Basalt Fiber Co., Ltd.) is 25mm in length and 0.8mm in diameter; The fine basalt fiber rod (Sichuan Aerospace Tuoda Basalt Fiber Co., Ltd.) is 8mm in length and 0.2mm in diameter. The high-performance polycarboxylate superplasticizer is ZTPCE-1 viscosity-reducing polycarboxylate superplasticizer (Anhui Zhongtie Engineering Materials Technology Co., Ltd.), with a water reduction rate of 35% and a solid content of 20%. The water is ordinary tap water; The preparation method of fatigue-resistant ballastless track concrete under high geothermal conditions specifically includes the following steps: (1) Weigh each raw material according to the weight of the fatigue-resistant ballastless track concrete under the above-mentioned high geothermal environment; (2) First add silicate cement, rock-based mineral admixture, coarse aggregate, fine aggregate, coarse basalt fiber rod and fine basalt fiber rod, and stir for 30 seconds; (3) Add high-performance polycarboxylate superplasticizer and water, stir for 200s, and you will get fatigue-resistant ballastless track concrete under high geothermal environment.

[0025] Example 3 Fatigue-resistant ballastless track concrete under high geothermal conditions comprises the following raw materials by weight: 350 kg of silicate cement, 100 kg of rock-based mineral admixtures, 1050 kg of coarse aggregate, 750 kg of fine aggregate, 6 kg of coarse basalt fiber rods, 2 kg of fine basalt fiber rods, 7 kg of high-performance polycarboxylate superplasticizer, and 145 kg of water. The silicate cement is PO 42.5 silicate cement (Beijing Jinyu) that meets the requirements of GB / 175-2007. The rock-based mineral admixture meets the requirements of "Rock-based Mineral Admixture for Railway Tunnel Mulch" (T / CRS P1501-2025), with a parent rock thermal expansion coefficient of 7.1×10⁻⁶. -6 / ℃; The coarse aggregate is limestone coarse aggregate impregnated with silica solution, meeting the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 7.1×10⁻⁶. -6 / ℃, the mass fraction of the silica solution is 4.5%, and the impregnation time is 24h; The fine aggregate is limestone fine aggregate from the same source as the coarse aggregate, meeting the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 7.1×10⁻⁶. -6 / ℃, stone powder content 4.2%, obtained through coarse aggregate crushing; The coarse basalt fiber rod (Sichuan Aerospace Tuoda Basalt Fiber Co., Ltd.) is 30mm in length and 0.1mm in diameter; The fine basalt fiber rod (Sichuan Aerospace Tuoda Basalt Fiber Co., Ltd.) is 8mm in length and 0.1mm in diameter; The high-performance polycarboxylate superplasticizer is PCEA-1 viscosity-reducing polycarboxylate superplasticizer (Jiangsu Subote New Material Co., Ltd.), with a water reduction rate of 32% and a solid content of 20%. The water is ordinary tap water; The preparation method of fatigue-resistant ballastless track concrete under high geothermal conditions specifically includes the following steps: (1) Weigh each raw material according to the weight of the fatigue-resistant ballastless track concrete under the above-mentioned high geothermal environment; (2) First add silicate cement, rock-based mineral admixture, coarse aggregate, fine aggregate, coarse basalt fiber rod and fine basalt fiber rod, and stir for 30 seconds; (3) Add high-performance polycarboxylate superplasticizer and water, stir for 210s, and you will get fatigue-resistant ballastless track concrete under high geothermal environment.

[0026] Comparative Example 1 Fatigue-resistant ballastless track concrete under high geothermal conditions comprises the following raw materials by weight: 400 kg of silicate cement, 80 kg of slag powder, 1000 kg of coarse aggregate, 820 kg of fine aggregate, 6 kg of high-performance polycarboxylate superplasticizer, and 115 kg of water. The silicate cement is PO 42.5 silicate cement (Beijing Jinyu) that meets the requirements of GB / 175-2007. The slag powder is S105 grade slag powder that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018); The coarse aggregate is limestone coarse aggregate that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 8.2×10⁻⁶. -6 / ℃; The fine aggregate is limestone fine aggregate that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 7.5×10⁻⁶. -6 / ℃; The high-performance polycarboxylate superplasticizer is ZTPCE-1 viscosity-reducing polycarboxylate superplasticizer (Anhui Zhongtie Engineering Materials Technology Co., Ltd.), with a water reduction rate of 35% and a solid content of 20%. The water is ordinary tap water; The preparation method of fatigue-resistant ballastless track concrete under high geothermal conditions specifically includes the following steps: (1) Weigh each raw material according to the weight of the fatigue-resistant ballastless track concrete under the above-mentioned high geothermal environment; (2) First add silicate cement, slag powder, coarse aggregate and fine aggregate, and stir for 30 seconds; (3) Add high-performance polycarboxylate superplasticizer and water, stir for 120s, and you will get fatigue-resistant ballastless track concrete under high geothermal environment.

[0027] Comparative Example 2 Fatigue-resistant ballastless track concrete under high geothermal conditions comprises the following raw materials by weight: 400 kg of silicate cement, 80 kg of composite mineral admixture, 1050 kg of coarse aggregate, 800 kg of fine aggregate, 5.5 kg of high-performance polycarboxylate superplasticizer, and 120 kg of water. The silicate cement is PO 42.5 silicate cement (Beijing Jinyu) that meets the requirements of GB / 175-2007. The composite mineral admixture is the CMAC-0Ⅱ-JG / T 486-2015 type composite mineral admixture that meets the requirements of "Composite Admixtures for Concrete" (JG / T 486-2015); The coarse aggregate is granite coarse aggregate that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 10.5×10⁻⁶. -6 / ℃; The fine aggregate is granite fine aggregate that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 10.5×10⁻⁶. -6 / ℃; The high-performance polycarboxylate superplasticizer is ZTPCE-1 viscosity-reducing polycarboxylate superplasticizer (Anhui Zhongtie Engineering Materials Technology Co., Ltd.), with a water reduction rate of 35% and a solid content of 20%. The water is ordinary tap water; The preparation method of fatigue-resistant ballastless track concrete under high geothermal conditions specifically includes the following steps: (1) Weigh each raw material according to the weight of the fatigue-resistant ballastless track concrete under the above-mentioned high geothermal environment; (2) First add silicate cement, composite mineral admixture, coarse aggregate and fine aggregate, and stir for 30 seconds; (3) Add high-performance polycarboxylate superplasticizer and water, stir for 120s, and you will get fatigue-resistant ballastless track concrete under high geothermal environment.

[0028] Comparative Example 3 Fatigue-resistant ballastless track concrete under high geothermal conditions comprises the following raw materials by weight: 420 kg of silicate cement, 80 kg of fly ash, 980 kg of coarse aggregate, 800 kg of fine aggregate, 8 kg of high-performance polycarboxylate superplasticizer, and 130 kg of water. The silicate cement is PO 42.5 silicate cement (Beijing Jinyu) that meets the requirements of GB / 175-2007. The fly ash is Class I fly ash that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018); The coarse aggregate is tuff coarse aggregate that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 11.3×10⁻⁶. -6 / ℃; The fine aggregate is gneiss fine aggregate that meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (TB 10424-2018), with a parent rock thermal expansion coefficient of 10.9×10. -6 / ℃; The high-performance polycarboxylate superplasticizer is PCEA-1 viscosity-reducing polycarboxylate superplasticizer (Jiangsu Subote New Material Co., Ltd.), with a water reduction rate of 32% and a solid content of 20%. The water is ordinary tap water; The preparation method of fatigue-resistant ballastless track concrete under high geothermal conditions specifically includes the following steps: (1) Weigh each raw material according to the weight of the fatigue-resistant ballastless track concrete under the above-mentioned high geothermal environment; (2) First add silicate cement, fly ash, coarse aggregate and fine aggregate, and stir for 20 seconds; (3) Add high-performance polycarboxylate superplasticizer and water, stir for 180s, and you will get fatigue-resistant ballastless track concrete under high geothermal environment.

[0029] Performance testing Concrete samples prepared in Examples 1-3 and Comparative Examples 1-3 were tested for 28-day compressive strength, fatigue cycles (20℃, according to TCECS 1499-2023 Railway Concrete Fatigue Performance Test Procedure), and fatigue cycles (60℃, according to TCECS 1499-2023 Railway Concrete Fatigue Performance Test Procedure).

[0030] The results are shown in Table 1.

[0031] Table 1. Compressive strength and fatigue cycles of concrete in Examples 1-3 and the comparative examples.

[0032] As shown in Table 1, compared with Comparative Examples 1-3, the compressive strength of the ballastless track concrete in Examples 1-3 did not change significantly and all met the compressive strength requirements of high-speed railway ballastless track concrete. However, the fatigue life of the ballastless track concrete under high ground temperature conditions (60℃) was significantly improved.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fatigue-resistant ballastless track concrete for high geothermal environments, characterized in that, It includes the following raw materials in parts by weight: 350-400 parts silicate cement, 50-100 parts rock-based mineral admixture, 900-1200 parts coarse aggregate, 600-800 parts fine aggregate, 5-15 parts fiber reinforcement, 6-10 parts workability modifier, and 120-150 parts water.

2. The fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 1, characterized in that, The parent rock of the mineral admixture has a thermal expansion coefficient of <8.0×10⁻⁶. -6 / ℃.

3. The fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 1, characterized in that, The coarse aggregate is coarse aggregate that has been impregnated with silica solution; the coarse aggregate is derived from the parent rock of the same origin as the rock-based mineral admixture through crushing and processing; the mass fraction of the silica solution is 3%-5%; and the impregnation time is <12h.

4. The fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 1, characterized in that, The fine aggregate is manufactured sand of the same origin as the coarse aggregate and the rock-based mineral admixture, with a stone powder content of <5%, and is obtained by direct processing of the parent rock or by crushing the coarse aggregate.

5. The fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 1, characterized in that, The fiber reinforcement component is a basalt hybrid fiber, including coarse basalt fiber rods and fine basalt fiber rods, with a mass ratio of (5-8):(2-5).

6. The fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 5, characterized in that, The coarse basalt fiber rods are 20-30 mm long and 0.5-1 mm in diameter; the fine basalt fiber rods are 5-8 mm long and 0.1-0.2 mm in diameter.

7. The fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 1, characterized in that, The performance regulating material is a high-performance polycarboxylate superplasticizer with a water reduction rate >32%.

8. A method for preparing fatigue-resistant ballastless track concrete under high geothermal conditions, characterized in that, Specifically, the following steps are included: (1) Weigh each raw material according to the weight proportions of the fatigue-resistant ballastless track concrete under high geothermal environment as described in any one of claims 1-7; (2) First add silicate cement, rock-based mineral admixture, coarse aggregate, fine aggregate and fiber reinforcement components, and mix; (3) Add performance-regulating materials and water, stir, and the fatigue-resistant ballastless track concrete under high geothermal environment is obtained.

9. The method for preparing fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 8, characterized in that, In step (2), the stirring time is 30 seconds.

10. The method for preparing fatigue-resistant ballastless track concrete under high geothermal conditions according to claim 8, characterized in that, In step (3), the stirring time is >3 min.

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