Concrete capable of rapidly rebounding under construction condition in winter and preparation method of concrete

Abstract

The invention relates to the technical field of concrete, and particularly discloses concrete capable of rapidly rebounding under construction conditions in winter and a preparation method of the concrete. The invention relates to concrete capable of rapidly rebounding under a construction condition in winter. The concrete is prepared from the following raw materials in parts by weight: 165-175 parts of water, 335-345 parts of cement, 675-685 parts of sand, 1030-1040 parts of gravel, 60-70 parts of fly ash, 5-6 parts of an additive, 80-90 parts of mineral powder and 15-20 parts of a self-heating regulating filler, the self-heating regulation and control filler is prepared by the following steps: S1, mixing raw materials of aluminum powder, activated carbon, sodium chloride and diatomite, and granulating through a granulator; and S2, spraying silica sol on the surfaces of the particles obtained in the step S1, and drying to obtain the self-heating regulation and control filler. According to the concrete capable of rapidly rebounding under the construction condition in winter, the rebounding period of the concrete in the construction process in winter can be remarkably shortened, structural damage caused by freezing expansion of free water is reduced, and finally the concrete capable of rapidly rebounding under the construction condition in winter is obtained.

Description

Technical Field

[0001] The present application relates to the field of concrete technology, and more specifically, to a concrete that rebounds quickly under winter construction conditions and a preparation method thereof. Background Art

[0002] Concrete is a composite material composed of aggregate, cement, water and other additives. After concrete is constructed, the cement hydration reaction inside it will be very active and the strength will increase rapidly. Generally speaking, it takes a certain amount of time for concrete to reach its basic design strength, at which time its rebound performance is the best.

[0003] The hardening process of concrete is an exothermic reaction, and ambient temperature is a significant factor affecting the hardening and rebound cycles of concrete. Generally, the higher the ambient temperature, the faster the concrete hardens and the shorter the rebound cycle. Winter concrete rebound is a common phenomenon in concrete projects, and its rebound time is of great significance to project quality. In winter, temperatures are low, and at low temperatures, the water in the concrete easily freezes, leading to the formation of ice crystals. This not only seriously affects the hydration of the concrete, significantly slowing the cement hydration reaction, slowing the growth of concrete strength, and reducing rebound properties, but also causes the expansion of free water into ice, causing internal microcracks and damaging the concrete structure, negatively affecting the strength and durability of the concrete. Therefore, the above situation will affect the construction schedule and may also pose a potential threat to the quality of the project.

[0004] Regarding the above-mentioned related technologies, in the existing technology, the temperature of concrete is usually increased as much as possible during winter concrete construction, for example, by using heated concrete and heated formwork, so as to shorten the concrete rebound period and reduce the negative impact of free water freezing and expansion; however, the above method not only consumes a lot of energy but also increases the difficulty of construction. Therefore, it is currently necessary to provide a concrete that can rebound quickly under winter construction conditions to overcome the above technical defects. Summary of the Invention

[0005] In order to significantly reduce the rebound period of concrete during winter construction and reduce the structural damage caused by the freezing and expansion of free water, the present application provides a concrete that rebounds quickly under winter construction conditions and a preparation method thereof.

[0006] In a first aspect, the present application provides a concrete that rebounds quickly under winter construction conditions, using the following technical solutions: A concrete with rapid rebound under winter construction conditions is made from the following raw materials in parts by weight: 165-175 parts water; 335-345 parts of cement; 675-685 parts of sand; 1030-1040 parts of crushed stone; 60-70 parts of fly ash; 5-6 parts of admixture; 80-90 parts of mineral powder; 15-20 parts of self-heating regulating filler; The self-heating regulating filler is prepared by the following steps: S1, mixing the raw materials of aluminum powder, activated carbon, sodium chloride and diatomaceous earth, and granulating them through a granulator; S2. Spraying silica sol on the surface of the particles obtained in step S1, and obtaining a self-heating control filler after drying.

[0007] By adopting the above technical solution, the self-heating control filler releases heat by chemically reacting in the concrete. This heat can maintain the internal temperature of the concrete in a low-temperature environment, prevent the hydration reaction from stagnating, and to a certain extent improve the hydration of the concrete. It can also reduce the structural damage caused by the freezing and expansion of free water, thereby reducing the adverse effects of low temperatures under winter construction conditions. Among the raw materials for preparing the self-heating control filler, aluminum powder can form a galvanic effect with water, activated carbon and sodium chloride, releasing a large amount of heat through redox reactions. The porous structure and large specific surface area of diatomaceous earth can help the above reaction proceed more stably and orderly, prevent the rapid loss of heat, and absorb some free water in the concrete, reducing the free water content that can participate in freezing and expansion. At the same time, during the preparation process, after granulation, the silica sol is sprayed to form a porous protective layer, which not only makes the self-heating control filler not easy to damage its overall structure and can be evenly dispersed when it is applied to the concrete, but also can release heat evenly and stably during the self-heating process, eliminating the adverse effects of volume expansion generated simultaneously during the self-heating process, and forming an excellent mutual promotion effect with the hydration of the concrete. In summary, a concrete that rebounds quickly under winter construction conditions can be obtained, which has significantly excellent concrete application prospects.

[0008] Preferably, in the preparation of the self-heating regulating filler, the weight ratio of aluminum powder, activated carbon, sodium chloride and diatomaceous earth is (5.5-6.5):(2.5-3.5):1:(0.7-0.9).

[0009] By adopting the above technical solution, when the raw materials in the above weight ratio are mixed and used, under the condition of winter construction adjustment of concrete, the heat released by the self-heating regulating filler can better compensate for the insufficient hydration heat in the low temperature environment, achieve the dynamic balance between the hydration of concrete and the temperature rise rate of concrete, and provide a buffer space for the volume expansion of ice crystals, thereby significantly reducing the rebound period of concrete during winter construction, and reducing the structural damage caused by the freezing and expansion of free water, and finally obtaining concrete with better application quality.

[0010] Preferably, the porosity of the self-heating regulating filler is 20-30%.

[0011] By adopting the above technical solution, when the porosity of the self-heating regulating filler is low, the heat released cannot meet the insufficient hydration heat demand in a low-temperature environment; when the porosity of the self-heating regulating filler is high, it will cause heat to dissipate too quickly, resulting in a significant reduction in the corresponding effect brought about by itself; and the self-heating regulating filler in the above-mentioned porosity range can exert a stable and better corresponding effect when used, thereby making the application effect of concrete in the winter construction process more outstanding.

[0012] Preferably, 30-35 parts by weight of a functional additive is further added to the raw material, the functional additive is composed of hydrated calcium silicate crystal seeds and an air entraining agent, and the weight ratio of the hydrated calcium silicate crystal seeds to the air entraining agent is (20-30):1.

[0013] By adopting the above technical solution, the calcium silicate hydrate seed crystals can induce the locally reacting crystals to be induced by the crystal nucleation structure, accelerate the formation of nuclei, and reduce the nucleation barrier of crystal precipitation, thereby promoting the hydration reaction; the air-entraining agent can ensure that the concrete has sufficient air content, so that a large number of tiny, stable, and evenly distributed bubbles are generated inside the concrete. These bubbles can alleviate the expansion caused by the freezing of free water in the concrete; when the calcium silicate hydrate seed crystals and the air-entraining agent are used together to form a functional additive, the two can have an excellent composite synergistic effect on each other. The bubble structure formed inside the concrete where the air-entraining agent is located can provide a place for the induced hydration of the calcium silicate hydrate seed crystals, and the free water in the bubble structure can quickly participate in the above-mentioned induced reaction, thereby further reducing the rebound period of the concrete during winter construction, and further reducing the structural damage caused by the freezing and expansion of free water, thereby significantly improving the application quality of the concrete.

[0014] Preferably, the weight ratio of the calcium silicate hydrate seed crystals to the air entraining agent is 25:1.

[0015] By adopting the above technical solution, when the calcium silicate hydrate seeds and air-entraining agent in the above weight ratio are used together, the synergistic compounding effect formed between them is better, thereby making the corresponding improvement effect brought about by the application of functional additives better, and finally obtaining concrete with excellent overall quality and fast rebound under winter construction conditions.

[0016] Preferably, the raw material is also added with 0.8-1.0kg / m 3 of polypropylene fiber.

[0017] By adopting the above technical solution, polypropylene fibers form a support system through three-dimensional random distribution, absorb the stress generated by ice crystal expansion through elastic deformation, and can significantly reduce the structural damage caused by the freezing expansion of free water in concrete. The evenly dispersed polypropylene fibers can reduce the bleeding and segregation of the mixture, optimize the density of the concrete slurry, and promote the concrete hydration reaction to proceed more quickly and fully. At the same time, the use of polypropylene fibers can also play a synergistic role in promoting the self-heating regulating filler in concrete. On the one hand, the polypropylene fibers block the pore connectivity through the three-dimensional network, reduce the escape path of water vapor generated by the reaction of the self-heating regulating filler, and make heat accumulate more efficiently inside the concrete. On the other hand, the polypropylene fibers can absorb part of the free water and limit the displacement of the self-heating regulating filler, thereby ensuring that the self-heating regulating filler can release heat more stably. In this way, the rebound period of the concrete during winter construction is significantly further reduced, and the structural damage caused by the freezing expansion of free water can be significantly reduced, thereby obtaining concrete with better application quality and fast rebound under winter construction conditions.

[0018] Preferably, the polypropylene fiber has a length of 18-20 mm and a diameter of 0.12-0.18 mm.

[0019] By adopting the above technical solution, the polypropylene fiber of the above specifications is more suitable for the needs of concrete preparation, and can exert excellent and stable corresponding effects during the application process, thereby obtaining concrete with excellent and stable application quality and rapid rebound under winter construction conditions.

[0020] In a second aspect, the present application provides a method for preparing concrete that rebounds quickly under winter construction conditions, using the following technical solutions: A method for preparing concrete with rapid rebound under winter construction conditions comprises the following steps: (1) preparing raw materials including water, cement, sand, crushed stone, fly ash, admixture, mineral powder and self-heating control filler according to a proportion; (2) stirring and mixing the sand and crushed stone in step (1), then adding cement, fly ash and mineral powder and stirring and mixing, then adding water and admixture and stirring and mixing, and finally adding self-heating control filler and stirring and mixing, to obtain concrete with rapid rebound under winter construction conditions.

[0021] By adopting the above technical solution, the above preparation method is simple to operate, suitable for large-scale industrial production, and can make the raw materials fully cooperate and stably exert their corresponding effects, and finally obtain concrete with excellent application quality and stable application and rapid rebound under winter construction conditions.

[0022] In summary, this application has the following beneficial effects: 1. This application uses specially prepared self-heating control fillers in concrete. The self-heating control fillers produce chemical reactions and release heat. This heat can maintain the internal temperature of the concrete in a low-temperature environment, prevent the stagnation of the hydration reaction, and to a certain extent improve the hydration of the concrete. It can also reduce the structural damage caused by the freezing and expansion of free water, thereby reducing the adverse effects of low temperatures during winter construction conditions. 2. This application uses a functional additive consisting of a combination of calcium silicate hydrate seed crystals and an air-entraining agent to further reduce the rebound period of concrete during winter construction, further reducing the structural damage caused by the freezing and expansion of free water, thereby significantly improving the application quality of concrete. 3. By adding and using polypropylene fibers, this application can significantly reduce the structural damage caused by the freezing expansion of free water in concrete, and promote the concrete hydration reaction to proceed more quickly and fully. In addition, the polypropylene fibers can also synergistically promote the self-heating regulating filler to play a better role, thereby obtaining concrete with better application quality and rapid rebound under winter construction conditions. DETAILED DESCRIPTION

[0023] The present application is further described in detail below with reference to preparation examples, embodiments and comparative examples.

[0024] Unless otherwise specified, the raw materials used in the preparation examples, embodiments and comparative examples of this application are commercially available: Cement purchased from Jinfeng PO425 cement; The sand was purchased from Jintong Machine Sand; The crushed stones were purchased from Jiujiang Jintuo with specifications of 5-25 mm. Fly ash is Class F, Grade I; The admixture is ZWL-A-IX high-performance water reducer; The mineral powder was purchased from Baotian S95 grade; Silica sol was purchased from Hangzhou Hengge Nanotechnology Co., Ltd., model HN-SI13J; The air entraining agent was purchased from Yida Cellulose Air Entraining Agent YQJ71.

[0025] Preparation examples of raw materials and / or intermediates Preparation Example 1 A self-heating regulating filler is prepared by the following steps: S1, mixing the raw materials of aluminum powder, activated carbon, sodium chloride and diatomaceous earth, and granulating them through a dry powder granulator; S2. Spraying silica sol on the surface of the particles obtained in step S1, and obtaining a self-heating control filler after drying.

[0026] Note: In the above operation, the particle size of the self-heating control filler is 100 μm; the amount of silica sol used is 12% of the weight of the particles obtained in step S1; the weight ratio of aluminum powder, activated carbon, sodium chloride and diatomaceous earth is 6:3:1:0.8; and the porosity of the self-heating control filler is 25%.

[0027] Preparation Example 2 A self-heating regulating filler is different from Preparation Example 1 in that the weight ratio of aluminum powder, activated carbon, sodium chloride and diatomaceous earth is 5.5:2.5:1:0.7.

[0028] Preparation Example 3 A self-heating regulating filler is different from Preparation Example 1 in that the weight ratio of aluminum powder, activated carbon, sodium chloride and diatomaceous earth is 6.5:3.5:1:0.9.

[0029] Preparation Example 4 A self-heating regulating filler is different from Preparation Example 1 in that the porosity of the self-heating regulating filler is 20%.

[0030] Preparation Example 5 A self-heating regulating filler is different from Preparation Example 1 in that the porosity of the self-heating regulating filler is 30%.

[0031] Preparation Example 6 A self-heating regulating filler is different from Preparation Example 1 in that the porosity of the self-heating regulating filler is 18%.

[0032] Preparation Example 7 A self-heating regulating filler is different from Preparation Example 1 in that the porosity of the self-heating regulating filler is 32%. Example

[0033] Example 1 A concrete with rapid rebound under winter construction conditions is prepared by the following steps: (1) preparing raw materials including water, cement, sand, crushed stone, fly ash, admixture, mineral powder and self-heating control filler according to the proportion; (2) After the sand and gravel in step (1) are stirred and mixed, cement, fly ash and mineral powder are added and stirred, water and admixtures are added and stirred, and finally self-heating control filler is added and stirred to obtain concrete with rapid rebound under winter construction conditions.

[0034] Note: In the above operation, the self-heating control filler is obtained from Preparation Example 1.

[0035] Example 2-3 A concrete with rapid rebound under winter construction conditions is different from Example 1 in that the raw materials used in its preparation and their corresponding weights are shown in Table 1.

[0036] Table 1 Raw materials used in the preparation of Examples 1-3 and their weight parts (kg / part) raw material Example 1 Example 2 Example 3 water 170 165 175 cement 340 335 345 sand 680 675 685 gravel 1035 1030 1040 fly ash 65 60 70 admixtures 5.5 5 6 Mineral powder 85 80 90 Self-heating regulating filler 17.5 15 20 Example 4 A concrete with rapid rebound under winter construction conditions, which is different from Example 1 in that the self-heating regulating filler is obtained from Preparation Example 2.

[0037] Example 5 A concrete that rebounds quickly under winter construction conditions, which is different from Example 1 in that the self-heating regulating filler is obtained from Preparation Example 3.

[0038] Example 6 A concrete with rapid rebound under winter construction conditions, which is different from Example 1 in that the self-heating regulating filler is obtained from Preparation Example 4.

[0039] Example 7 A concrete with rapid rebound under winter construction conditions, which is different from Example 1 in that the self-heating regulating filler is obtained from Preparation Example 5.

[0040] Example 8 A concrete that rebounds quickly under winter construction conditions, which differs from Example 1 in that the self-heating regulating filler is obtained from Preparation Example 6.

[0041] Example 9 A concrete that rebounds quickly under winter construction conditions, which differs from Example 1 in that the self-heating regulating filler is obtained from Preparation Example 7.

[0042] Example 10 A concrete with rapid rebound under winter construction conditions is provided. The concrete differs from Example 1 in that 32.5 parts by weight of a functional additive are further added to the raw materials. The functional additive comprises hydrated calcium silicate seed crystals and an air-entraining agent in a ratio of 25:1 by weight. The functional additive is added together with a self-heating regulating filler during use.

[0043] Example 11 A concrete with rapid rebound under winter construction conditions, which is different from Example 10 in that the weight portion of the functional additive added is 30 parts.

[0044] Example 12 A concrete with rapid rebound under winter construction conditions, which is different from Example 10 in that the weight portion of the functional additive added is 35 parts.

[0045] Example 13 A concrete with rapid rebound under winter construction conditions, which differs from Example 10 in that the functional additive consists of hydrated calcium silicate seed crystals and an air-entraining agent in a weight ratio of 20:1.

[0046] Example 14 A concrete with rapid rebound under winter construction conditions, which differs from Example 10 in that the functional additive consists of hydrated calcium silicate seed crystals and an air-entraining agent in a weight ratio of 30:1.

[0047] Example 15 A concrete with rapid rebound under winter construction conditions, which differs from Example 10 in that no calcium silicate hydrate seed crystals are used in the functional additive.

[0048] Example 16 A concrete that rebounds quickly under winter construction conditions, which differs from Example 10 in that no air entraining agent is used in the functional additive.

[0049] Example 17 A fast-rebound concrete under winter construction conditions, which is different from Example 1 in that the raw materials are further added with a dosage of 0.9 kg / m 3 The polypropylene fiber has a length of 19 mm and a diameter of 0.15 mm, and the polypropylene fiber is added together with the self-heating regulating filler when in use.

[0050] Example 18 A concrete with rapid rebound under winter construction conditions, which is different from Example 17 in that the amount of polypropylene fiber added is 0.8 kg / m 3 .

[0051] Example 19 A concrete with rapid rebound under winter construction conditions, which is different from Example 17 in that the amount of polypropylene fiber added is 1.0 kg / m 3 .

[0052] Example 20 A concrete that rebounds quickly under winter construction conditions, which differs from Example 17 in that the polypropylene fiber has a length of 18 mm and a diameter of 0.12 mm.

[0053] Example 21 A concrete that rebounds quickly under winter construction conditions, which differs from Example 17 in that the polypropylene fiber has a length of 20 mm and a diameter of 0.18 mm.

[0054] Comparative Example Comparative Example 1 A concrete with rapid rebound under winter construction conditions, which differs from Example 1 in that no self-heating regulating filler is used in the raw materials.

[0055] Comparative Example 2 A concrete that rebounds quickly under winter construction conditions, which differs from Example 17 in that no self-heating regulating filler is used in the raw materials.

[0056] Performance test samples: The concrete with rapid rebound under winter construction conditions obtained in Example 1-21 was selected as test sample 1-21, and the concrete with rapid rebound under winter construction conditions obtained in Comparative Example 1-2 was selected as control sample 1-2.

[0057] Test method: During the concrete hydration reaction, the growth of hydration products will reduce the resistivity of concrete. Measuring the resistivity change of concrete can indirectly reflect the change of hydration degree.

[0058] A mold with a size of 100mm×100mm×100mm was selected. Concrete that rebounds quickly under winter construction conditions was poured into the mold and then placed in a constant temperature and humidity test box for curing. The temperature was -10℃ and the relative humidity was 60%. During the process, a ZXL-4000A concrete resistivity tester was used to monitor the change in resistivity in real time. When there was no obvious change in resistivity, it indicated that the hydration process of the concrete was completed, and the duration was recorded as the rebound period.

[0059] At the same time, a concrete strength tester is used to test the above-mentioned stable concrete specimens, and the percentage value of the concrete strength reaching the design strength is calculated based on the design strength. The higher the percentage value, the less structural damage caused by the freezing and expansion of free water.

[0060] After performing the above tests on test samples 1-21 and control samples 1-2, the test results are recorded in Table 2.

[0061] Table 2 Test results of test samples 1-21 and sample 1-2 Combining Examples 1-3 and Comparative Example 1 with Table 2, it can be seen that by using specially prepared self-heating regulating fillers in concrete, the hydration process of concrete can be accelerated. Under winter construction conditions, the rebound period obtained in the above test can be significantly reduced, meeting the application requirement of a rebound period (-10°C) <30d, and the concrete strength can be significantly increased to a percentage value of the design strength, indicating that the structural damage caused by the freezing and expansion of free water in the concrete is relatively small; if the self-heating regulating filler is not used, it is found that the rebound period of the concrete in the winter construction environment reaches 34.1d, which is much higher than the rebound period of the concrete using the self-heating regulating filler, and the percentage value of the concrete strength reaching the design strength is also significantly lower, indicating that the fast-rebounding concrete under winter construction conditions of the present application has significant advancement and excellent application prospects.

[0062] Combining Example 1 and Examples 6-9 with Table 2, it can be seen that when the porosity of the self-heating regulating filler is 20-30%, it can bring stable and better application effects. When the porosity of the self-heating regulating filler is lower or higher than the above range, it is found that the rebound period obtained by the above test will be significantly increased, and the percentage value of the concrete strength reaching the design strength will also be significantly decreased. This shows that after the application of the self-heating regulating filler in the above porosity range, the concrete that rebounds quickly under winter construction conditions can have better quality.

[0063] In combination with Example 1 and Examples 10-14 and Table 2, it can be seen that the use of a functional additive consisting of a combination of calcium silicate hydrate seeds and an air-entraining agent can further reduce the rebound period of concrete during winter construction, and the percentage of concrete strength reaching the design strength is also increased, indicating that the structural damage caused by the freezing and expansion of free water is reduced, thereby significantly improving the application quality of concrete; in combination with Examples 15-16 and Table 2, it can be seen that the combination of calcium silicate hydrate seeds and the air-entraining agent can bring about a significant improvement effect of 1+1>2, indicating that a good synergistic mechanism is established between the two, which can further reduce the rebound period of concrete during winter construction and the structural damage caused by the freezing and expansion of free water.

[0064] Combining Example 1 with Examples 17-21 and Table 2, it can be seen that the addition of polypropylene fiber to concrete can significantly reduce structural damage caused by the freezing expansion of free water, and promote a faster and more complete hydration reaction of the concrete, further reducing the rebound period obtained in the above test and further increasing the percentage of concrete strength reaching the design strength. Combining Comparative Example 2 with Table 2, it can be seen that if the concrete lacks the use of self-heating control filler, the corresponding effect of the polypropylene fiber is significantly reduced. This indicates that there is a synergistic effect between the polypropylene fiber and the self-heating control filler, thereby obtaining a concrete with better application quality and rapid rebound under winter construction conditions.

[0065] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A concrete that rebounds quickly under winter construction conditions, characterized in that: Made from the following raw materials in parts by weight: 165-175 parts water; 335-345 parts of cement; 675-685 parts of sand; 1030-1040 parts of crushed stone; 60-70 parts of fly ash; 5-6 parts of admixture; 80-90 parts of mineral powder; 15-20 parts of self-heating regulating filler; The self-heating regulating filler is prepared by the following steps: S1, mixing the raw materials of aluminum powder, activated carbon, sodium chloride and diatomaceous earth, and granulating them through a granulator; S2. Spraying silica sol on the surface of the particles obtained in step S1, and obtaining a self-heating control filler after drying.

2. The concrete with rapid rebound under winter construction conditions according to claim 1, characterized in that: In the preparation of the self-heating regulating filler, the weight ratio of aluminum powder, activated carbon, sodium chloride and diatomaceous earth is (5.5-6.5): (2.5-3.5): 1: (0.7-0.9).

3. The concrete with rapid rebound under winter construction conditions according to claim 1, characterized in that: The porosity of the self-heating regulating filler is 20-30%.

4. The concrete with rapid rebound under winter construction conditions according to claim 1, characterized in that: The raw materials are further added with 30-35 parts by weight of a functional additive, which consists of hydrated calcium silicate crystal seeds and an air entraining agent, and the weight ratio of the hydrated calcium silicate crystal seeds to the air entraining agent is (20-30):

1.

5. The concrete with rapid rebound under winter construction conditions according to claim 4, characterized in that: The weight ratio of the calcium silicate hydrate seed crystals to the air entraining agent is 25:

1.

6. The concrete with rapid rebound under winter construction conditions according to claim 1, characterized in that: The raw material is also added with a dosage of 0.8-1.0kg / m 3 of polypropylene fiber.

7. The concrete with rapid rebound under winter construction conditions according to claim 1, characterized in that: The polypropylene fiber has a length of 18-20 mm and a diameter of 0.12-0.18 mm.

8. The method for preparing concrete with rapid rebound under winter construction conditions according to claim 1, characterized in that: The following steps are involved: (1) Prepare raw materials including water, cement, sand, gravel, fly ash, admixtures, mineral powder and self-heating control filler according to the proportion; (2) After mixing the sand and gravel in step (1), cement, fly ash and mineral powder are added and mixed, water and admixtures are added and mixed, and finally self-heating control filler is added and mixed to obtain concrete with rapid rebound under winter construction conditions.

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