Salt-erosion-resistant high-ductility concrete suitable for saline-alkali dry environment and preparation method thereof

Abstract

The invention belongs to the field of building materials, and discloses salt-erosion-resistant high-ductility concrete suitable for a saline-alkali dry environment and a preparation method of the salt-erosion-resistant high-ductility concrete. The concrete is the concrete doped with ultra-high molecular weight polyethylene fibers; the component I is prepared from the following raw materials in parts by weight: 360 to 400 parts of cement, 160 to 200 parts of fly ash, 22 to 38 parts of silicon powder, 360 to 400 parts of quartz sand, 12 to 28 parts of latex powder, 1.8 to 4.3 parts of polyvinyl alcohol powder and 38 to 63 parts of air entraining agent; and; the component II is ultra-high molecular weight polyethylene fiber; the doping amount of the ultra-high molecular weight polyethylene fiber is 0.05-10 wt% of the component 1. The silicon powder and the ultra-high molecular weight polyethylene fiber are introduced into a concrete system, so that the concrete has excellent acid and alkali resistance, corrosion resistance, high strength and high binding power and can effectively adapt to special terrain environments such as saline-alkali soil, gobi deserts and deserts, the service life of the concrete under extreme conditions is remarkably prolonged, and the engineering applicability of the concrete under extreme conditions is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the field of building materials, and in particular relates to a salt-corrosion-resistant high-ductility concrete suitable for saline-alkali dry environments and a preparation method thereof. Background Art

[0002] Xinjiang has a diverse climate, mainly a temperate continental arid climate, with large temperature differences between day and night, little precipitation, large evaporation, cold winters, and hot summers. This climatic condition places special demands on the preparation and construction of concrete. The soil and groundwater in some parts of Xinjiang contain high concentrations of sulfates, which pose a threat to the durability of concrete structures. Sulfate erosion can cause concrete to expand and crack, reducing its strength and durability. In addition, Xinjiang is located at the junction of multiple plates, with complex geological structures and frequent seismic activity. Therefore, concrete used in construction needs to meet higher seismic performance requirements to ensure the safety and durability of buildings during earthquakes.

[0003] Turpan is known as the "Fire Continent" and is one of the hottest regions in China, with an average summer temperature of over 33°C and an extreme maximum temperature of 49.6°C. In addition, there are saline-alkali lands in Turpan, and the soil contains a large amount of sulfate. These conditions require concrete structures in Turpan to have higher heat resistance and resistance to sulfate erosion.

[0004] In view of the climate environment in Xinjiang, some salt-resistant and high-ductility concrete products have been launched on the market. For example, fibers are added to ordinary conventional concrete, and the fibers are tied together to make the concrete highly ductile and non-brittle. The fibers are usually polypropylene fibers or steel fibers to improve the toughness and crack resistance of concrete. The seismic level of the product cannot achieve satisfactory results. However, in areas such as Turpan that are rich in high concentrations of sulfates, coupled with the negative impact of sulfates, the buildings constructed with the products often have problems such as cracking and peeling of the exterior walls after more than five years.

[0005] Therefore, in view of the extreme climate in Xinjiang, there is an urgent need to develop a high-ductility concrete suitable for saline-alkali dry environment so that it can be widely used in special terrains such as deserts, Gobi deserts and saline-alkali land. Summary of the invention

[0006] The purpose of the present invention is to address some of the problems existing in the prior art. In a first aspect, the present invention provides a salt-corrosion-resistant and high-ductility concrete suitable for saline-alkali dry environments.

[0007] The second aspect of the present invention provides a construction method of the concrete.

[0008] In order to achieve the above-mentioned invention purpose, after research, this application provides the following technical solutions:

[0009] In a first aspect, the present application provides a concrete, wherein the concrete is concrete mixed with ultra-high molecular weight polyethylene fibers; the concrete comprises:

[0010] Component 1: comprising the following raw materials in parts by weight: 360-400 parts of cement, 160-200 parts of fly ash, 22-38 parts of silica fume, 360-400 parts of quartz sand, 12-28 parts of latex powder, 1.8-4.3 parts of polyvinyl alcohol powder, 38-63 parts of air entraining agent; and;

[0011] Component 2: ultra-high molecular weight polyethylene fiber; the blending amount of the ultra-high molecular weight polyethylene fiber is 5-10wt‰ of component 1.

[0012] Preferably, the concrete comprises:

[0013] Component 1: comprising the following raw materials in parts by weight: 370-390 parts of cement, 170-190 parts of fly ash, 25-35 parts of silica powder, 370-390 parts of quartz sand, 15-25 parts of latex powder, 2-4 parts of polyvinyl alcohol powder, 40-60 parts of air entraining agent; and;

[0014] Component 2: ultra-high molecular weight polyethylene fiber; the blending amount of the ultra-high molecular weight polyethylene fiber is 6-8wt‰ of component 1.

[0015] Furthermore, the ultra-high molecular weight polyethylene fiber density is 0.97-0.98 g / cm 3 , strength is 2.8~4N / tex, modulus is 91~140N / tex, and elongation is 3.5%~3.7%.

[0016] Furthermore, the length of the ultra-high molecular weight polyethylene fiber is 12-15 mm.

[0017] Furthermore, the specific gravity of the silicon powder is 2.2 to 2.5 g / cm 3 , the average particle size is 0.1~0.2μm.

[0018] Furthermore, the latex powder includes at least one of ethylene / vinyl acetate copolymer, vinyl acetate / versatate copolymer, and acrylic copolymer.

[0019] Furthermore, the air entraining agent includes at least one of rosin derivatives, sodium alkyl sulfonate, and sodium alkylbenzene sulfonate.

[0020] In a second aspect, the present application provides a construction method of the concrete, comprising the following steps:

[0021] Step 1, mixing, crushing and sieving various raw materials of component 1 to obtain concrete premix powder;

[0022] Step 2, crushing the ultra-high molecular weight polyethylene fiber of component 2 to obtain ultra-high molecular weight polyethylene fiber with a length of 12-15 mm;

[0023] Step 3: Add water to the concrete premix, then add 12-15 mm ultra-high molecular weight polyethylene fibers, mix well, and then carry out construction.

[0024] The beneficial effects of this application are:

[0025] 1. The high-ductility concrete provided in this application can be used in saline-alkali dry environments, has excellent resistance to salt erosion, and can adapt to special working conditions such as saline-alkali land. In addition, the concrete also has good fireproof, waterproof and impermeability properties, which can effectively improve the durability and overall performance of buildings, and provide reliable protection for engineering construction in complex environments.

[0026] 2. In the concrete preparation process of this application, coarse aggregate is not used, but fine aggregate is used to make the concrete structure more dense and uniform, effectively reduce the internal pores, and improve the density of the material. Not only does it reduce the porosity of the concrete, but it also significantly enhances the overall structural strength and durability, making it have better mechanical properties and anti-corrosion capabilities in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure shows the mixing process of the concrete of Example 1 in an actual project.

[0028] Figure 2 This is a specific construction drawing of the concrete of Example 1 in an actual project.

[0029] Figure 3 This is a picture of the bending strength test of the concrete specimen in Example 1. DETAILED DESCRIPTION

[0030] In order to better understand the present invention, the present invention is further specifically described below through the following examples, but it should not be understood as a limitation of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above invention content are also considered to fall within the protection scope of the present invention.

[0031] In the examples, the test methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0032] A concrete, wherein the concrete is a concrete mixed with ultra-high molecular weight polyethylene fiber (Ultra-High Molecular Weight Polyethylene Fiber, referred to as UHMWPE fiber); the concrete comprises:

[0033] Component 1: comprising the following raw materials in parts by weight: 360-400 parts of cement, 160-200 parts of fly ash, 22-38 parts of silica fume, 360-400 parts of quartz sand, 12-28 parts of latex powder, 1.8-4.3 parts of polyvinyl alcohol powder, 38-63 parts of air entraining agent; and;

[0034] Component 2: ultra-high molecular weight polyethylene fiber; the blending amount of the ultra-high molecular weight polyethylene fiber is 5-10wt‰ of component 1.

[0035] In some preferred embodiments, the concrete comprises:

[0036] Component 1: comprising the following raw materials in parts by weight: 370-390 parts of cement, 170-190 parts of fly ash, 25-35 parts of silica powder, 370-390 parts of quartz sand, 15-25 parts of latex powder, 2-4 parts of polyvinyl alcohol powder, 40-60 parts of air entraining agent; and;

[0037] Component 2: ultra-high molecular weight polyethylene fiber; the amount of the ultra-high molecular weight polyethylene fiber added is 6-8wt‰ of component 1. That is, 6-8 kg of ultra-high molecular weight polyethylene fiber is added to one ton of component 1.

[0038] In some embodiments, the ultra-high molecular weight polyethylene fiber has a density of 0.97 to 0.98 g / cm 3 , strength is 2.8~4N / tex, modulus is 91~140N / tex, and elongation is 3.5%~3.7%.

[0039] Ultra-high molecular weight polyethylene fiber (UHMWPE fiber) is a high-performance fiber made of polyethylene resin with a molecular weight of more than 1 million. It has extremely high strength, modulus and excellent wear resistance, impact resistance, corrosion resistance and other properties.

[0040] Ultra-high molecular weight polyethylene fiber has excellent acid-base stability and can be used stably for a long time in a wide range of acid-base media. Its acid-base resistance is mainly determined by its special molecular structure and chemical properties. Ultra-high molecular weight polyethylene fiber has an extremely high molecular weight, and its molecular chains have strong interaction forces, forming a highly crystalline ordered structure, which makes the fiber have extremely high mechanical strength and rigidity. This structure ensures the stability of the fiber in acid and alkali. There are no active chemical functional groups in the molecular chain of ultra-high molecular weight polyethylene fiber, which has high chemical inertness and is not easy to react with acid and alkali media. This enables ultra-high molecular weight polyethylene fiber to effectively resist corrosion from acid and alkali media. The molecular chain of ultra-high molecular weight polyethylene fiber contains a large number of non-polar carbon-carbon bonds, which makes the fiber surface have low polarity and is not easy to interact with polar solvents, thereby reducing the erosion of the fiber by acid and alkali media. Therefore, ultra-high molecular weight polyethylene fiber has excellent chemical corrosion resistance.

[0041] The ultra-high molecular weight polyethylene fiber that meets the requirements is generally military ultra-high molecular weight polyethylene fiber, which is expensive and can be purchased in the market. This technology is the first to apply the ultra-high molecular weight polyethylene fiber in the field of construction.

[0042] In some embodiments, the specific gravity of the silicon powder is 2.2-2.5 g / cm 3 The main component is amorphous silicon dioxide with extremely fine particles (0.1-0.2 μm). The average particle size of the silicon powder is 100 times smaller than that of cement, and the specific surface area is about 15-20 m 2 / g.

[0043] In order to further improve the chemical corrosion resistance of high ductility concrete suitable for saline-alkali dry environment, silica fume is used as an auxiliary material to be added to high ductility concrete. The chemical composition of silica fume is silicon dioxide (SiO 2 ), is an inert substance and does not react chemically with most acids and alkalis. Adding silica fume can significantly reduce the permeability of concrete and reduce free Ca(OH) 2 , thus improving the concrete's resistance to chemical erosion. Silica fume is evenly distributed, has strong corrosion resistance, and improves cavitation resistance by 3 to 16 times. Silica fume replaces part of the cement dosage, which not only improves the microstructure but also reduces the peak value of hydrothermalization, and has a significant effect on improving the impermeability and corrosion resistance.

[0044] In addition, the addition of silica powder in the present application can further improve the compressive strength of the concrete, and synergistically act with quartz sand, latex powder, and polyvinyl alcohol powder to improve the compressive strength of the concrete in the present application.

[0045] In concrete, sand (grit) is an important fine aggregate that plays a key role in the composition of concrete.

[0046] Generally speaking, ordinary sand (sand) includes natural sand, machine-made sand and mixed sand; among them, natural sand includes river sand, sea sand and mountain sand.

[0047] In the concrete preparation process of the present application, coarse aggregate is not used, but fine aggregate is used. Due to the lack of coarse aggregate, in general, the compressive strength of concrete is relatively low. The technical solution of the present application uses quartz sand to replace ordinary, conventional sand to overcome the problem of low compressive strength of concrete without coarse aggregate. Quartz sand is quartz particles processed by crushing and screening quartz stone. Quartz stone is a non-metallic mineral whose mineral components are mainly silicon dioxide (SiO 2 ). Quartz sand plays an indispensable role in many key industrial fields, from basic glass manufacturing to high-tech semiconductor and photovoltaic industries. However, the use of quartz sand in the construction field is rare.

[0048] In some embodiments, the quartz sand has a mesh size of 40-200, preferably 40-100.

[0049] As fine aggregate, quartz sand not only reduces the porosity of concrete, but also significantly enhances the overall structural strength and durability, enabling it to have better mechanical properties and corrosion resistance in complex environments.

[0050] Latex powder is a powder adhesive made from a high molecular polymer emulsion after spray drying. It is usually divided into ethylene / vinyl acetate copolymer, vinyl acetate / versatate vinyl copolymer, acrylic copolymer and other types. Latex powder has good water resistance, construction performance and heat insulation, so it is widely used in construction and decoration.

[0051] Polyvinyl alcohol powder: resistant to mineral oils, greases, lubricants and most organic solvents. It is hygroscopic and can be used as a dispersant and protective colloid for vinyl chloride polymerization. It can also be used to make polyvinyl acetal and vinylon fibers. It can be used as an adhesive for metal, rubber, leather, etc., a binder for bookbinding, a sizing agent for fabrics, etc.

[0052] Fly ash is a solid waste generated during the combustion of coal in coal-fired power plants. It is mainly composed of inorganic components in coal, including silicon dioxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), ferric oxide (Fe 2 O 3), calcium oxide (CaO), etc. The particles of fly ash are fine, and the particle size is generally between 1 and 100 μm. It looks similar to cement, and the color varies from milky white to gray-black. As an important industrial waste, fly ash can be recycled and the pollution of waste to the environment can be reduced through reasonable treatment and utilization. Its wide application in many fields such as building materials, agriculture, and environmental protection has not only reduced production costs, but also improved resource utilization efficiency. This application does not limit the selection of fly ash, and technicians in this field purchase conventional fly ash products.

[0053] Air entraining agent in concrete refers to a special additive whose function is to introduce tiny bubbles when mixing concrete to improve the performance of the material. Its main ingredients usually include rosin derivatives and various sulfonates, such as sodium alkyl sulfonate and sodium alkylbenzene sulfonate.

[0054] The application of air-entraining agents is mainly concentrated in structures with strict requirements for frost resistance, such as dams, roads, bridge decks, airport runways and large-volume concrete projects that are susceptible to frost damage. Its function is to form well-structured bubbles, which can effectively improve the frost resistance of concrete and enable it to maintain good durability under severe cold conditions. Therefore, air-entraining agents are suitable for high-durability construction such as dams, high-grade roads, thermal power station cooling towers, and water tanks.

[0055] In addition, air-entraining agents are also used to reduce the damage to the structure caused by deicing salts spread on concrete roads and bridges, and to improve the convenience of high-workability concrete construction, especially suitable for situations where pumping construction is required. In general, concrete air-entraining agents are a key material for improving the performance of concrete and are of great significance for ensuring structural stability in extreme environments.

[0056] In some embodiments, the air entraining agent includes at least one of rosin derivatives, sodium alkyl sulfonate, and sodium alkylbenzene sulfonate.

[0057] In some embodiments, after testing, the flexural strength of the concrete specimens obtained is ≥11.0N / mm 2 , cube compressive strength ≥45.0N / mm 2 , equivalent bending toughness ≥130.0KJ / m 3 , equivalent bending strength ≥10.0N / mm 2 .

[0058] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0059] The ultra-high molecular weight polyethylene fiber used in the embodiment has a density of 0.97-0.98 g / cm 3The strength is 2.8~4N / tex, the modulus is 91~140N / tex, the elongation is 3.5%~3.7%, it has excellent acid and alkali stability, and has excellent chemical corrosion resistance.

[0060] The specific gravity of the silicon powder used in the embodiment is 2.2-2.5 g / cm 3 The main component is amorphous silicon dioxide with extremely fine particles (0.1-0.2 μm). The average particle size of silica powder is 100 times smaller than that of cement, and the specific surface area is about 15-20 m 2 / g.

[0061] Those skilled in the art can purchase relevant finished products.

[0062] Example 1

[0063] A salt-corrosion-resistant high-ductility concrete suitable for saline-alkali dry environment, comprising:

[0064] Component one is prepared from the following raw materials in parts by weight: 380 parts of cement, 180 parts of fly ash, 30 parts of silica fume, 385 parts of sand, 20 parts of latex powder, 3 parts of polyvinyl alcohol powder, and 50 parts of air entraining agent.

[0065] Component 2: ultra-high molecular weight polyethylene fiber; the added amount is 7 kg of ultra-high molecular weight polyethylene fiber per ton of component 1.

[0066] The density of the ultra-high molecular weight polyethylene fiber is 0.97-0.98 g / cm 3 The strength is 2.8~4N / tex, the modulus is 91~140N / tex, the elongation is 3.5%~3.7%, it has excellent acid and alkali stability, and has excellent chemical corrosion resistance.

[0067] The specific gravity of silica powder is 2.2~2.5g / cm 3 The main component is amorphous silicon dioxide with extremely fine particles (0.1-0.2 μm). The average particle size of silica powder is 100 times smaller than that of cement, and the specific surface area is about 15-20 m 2 / g.

[0068] The preparation method comprises the following steps:

[0069] The various raw materials of component one are mixed, crushed, and sieved to obtain a concrete premix powder without high molecular weight polyethylene fiber. The obtained concrete premix powder is in powder form, has a uniform texture, and has no lumps.

[0070] The ultra-high molecular weight polyethylene fibers of component two are crushed to obtain ultra-high molecular weight polyethylene fibers with a length of 12-15 mm.

[0071] During construction, add water to the concrete premix obtained from component 1, then add 12-15mm ultra-high molecular weight polyethylene fibers from component 2, and stir to mix well (such as Figure 1 As shown), obtain concrete and carry out construction. The construction site is shown in Figure 2 shown.

[0072] Example 2

[0073] A salt-corrosion-resistant high-ductility concrete suitable for saline-alkali dry environment, comprising:

[0074] Component one is prepared from the following raw materials in parts by weight: 390 parts of cement, 170 parts of fly ash, 25 parts of silica fume, 380 parts of sand, 15 parts of latex powder, 2.5 parts of polyvinyl alcohol powder, and 40 parts of air entraining agent.

[0075] Component 2: Ultra-high molecular weight polyethylene fiber; the added amount is 8 kg per ton of component 1.

[0076] The preparation method is the same as that in Example 1.

[0077] Example 3

[0078] A salt-corrosion-resistant high-ductility concrete suitable for saline-alkali dry environment, comprising:

[0079] Component one is prepared from the following raw materials in parts by weight: 370 parts of cement, 190 parts of fly ash, 35 parts of silica powder, 370 parts of sand, 25 parts of latex powder, 4 parts of polyvinyl alcohol powder, and 55 parts of air entraining agent.

[0080] Component 2: Ultra-high molecular weight polyethylene fiber; the added amount is 6 kg per ton of component 1.

[0081] The preparation method is the same as that in Example 1.

[0082] Test Example 1

[0083] The concrete of Example 1 was subjected to a performance test experiment (the test was commissioned by Xinjiang Construction Engineering Quality and Safety Testing Center (Limited Liability Company)).

[0084] The test items include: flexural strength, cube compressive strength, equivalent bending strength, equivalent bending toughness. The test methods include: GB / T 50081-2019, GB / T17671-2021, XJJ 135-2021, GB / T 50080-2016.

[0085] The test results are shown in Table 1. The tested samples meet the Class II requirements specified in the "XJJ 135-2021 Technical Standard for High Ductility Concrete Reinforcement".

[0086] The test results are as follows:

[0087] Table 1

[0088]

[0089] Bending strength test pictures Figure 3 The bending of ordinary concrete specimens at this level has caused fracture, while the concrete specimens of Example 1 will not fracture at this level. This is one of the important characteristics of the concrete of the present application that it has high ductility. Under strong earthquakes, the concrete construction of the present application can ensure that the wall will not fracture or collapse due to the overall shaking of the structure.

[0090] Test Example 2

[0091] This test example tests the damage process of the above-mentioned embodiments and comparative examples under the effect of sulfate-wet-dry cycle coupling.

[0092] The sulfate-wet-dry cycle test is a test method used to evaluate the durability of concrete or other building materials in a sulfate attack environment. The test simulates the dry-wet alternating environment in which the material is exposed in actual engineering to study the performance changes of the material under sulfate attack.

[0093] The specific steps of the sulfate-wet-dry cycle method are generally as follows: the concrete specimen is immersed in a sulfate solution for a certain period of time, then taken out and dried in the air, and this cycle is repeated. The resistance to sulfate corrosion is evaluated by measuring indicators such as the mass change, compressive strength loss, and dynamic elastic modulus change of the specimen after different numbers of cycles.

[0094] Concrete specimens were prepared according to the formula of Example 1, with a size of 100mm×100mm×100mm. A 15% sodium sulfate solution was used as the corrosive medium, and the concrete specimens were completely immersed in the sodium sulfate solution for 5 hours; the specimens were taken out and dried for 19 hours in a laboratory environment at 20°C to 25°C; the immersion-drying process was one cycle, and a test was performed every 4 cycles. The entire test cycle included multiple stages such as 30, 60, 90, 180, 240, and 300 days to evaluate its durability in the long term. Among them, a clean water group was set up using clean water as a control.

[0095] The test results are as follows:

[0096] (1) Through observation, it was found that the concrete of Example 1 had only slight corner chipping on the surface during the entire sulfate-wet-dry cycle, and its integrity was not significantly damaged, indicating that its integrity was well maintained throughout the entire cycle.

[0097] (2) The mechanical properties of the concrete specimens of the above embodiment were tested in a sulfate-dry-wet cycle. The test results are shown in Table 2.

[0098] Table 2 Mechanical properties

[0099]

[0100] As shown in Table 2, the concrete specimens of Example 1 have 2 SO 4 The mass loss rate in the solution (-0.04%) is similar to that of the clear water group (-0.05%), the compressive strength change rate (-1.08%) is slightly lower than that of the clear water group (-0.83%), and the relative dynamic elastic modulus (101.67%) remains stable compared with the clear water group (101.02%), which shows that the mechanical properties of the specimens are relatively stable throughout the cycle, indicating that the concrete can still maintain good physical and mechanical properties under sulfate-dry-wet cycles.

[0101] (3) The anti-deterioration performance of the concrete specimens of the above embodiment in the sulfate-dry-wet cycle was tested. The test results are shown in Table 3.

[0102] Table 3

[0103]

[0104] As shown in Table 3, the concrete was analyzed in terms of acoustic time, acoustic velocity, and distance measurement by ultrasonic nondestructive testing. In the entire cycle, the ultra-high performance concrete showed excellent anti-deterioration performance.

[0105] (4) The load-time curve of the concrete was compared with the ring count-time curve, energy-time curve and amplitude-time curve using acoustic emission technology (third-party testing). It was found that the concrete under uniaxial compression went through four stages: concrete compaction, crack initiation, crack development and specimen destruction. The continuous fluctuation of the data in the crack development stage showed that the fiber had a good blocking effect on the development of concrete cracks.

[0106] (5) Through SEM test analysis (third-party testing), it was found that: in the early stage of the cycle, the hydration products generated by the concrete specimen will fill the internal pores of the concrete. As the cycle period increases, the hydration products and sulfate crystals gradually increase. In the late stage of the cycle, due to excessive expansion stress, tiny cracks appear inside the concrete, and the external solution begins to enter the concrete in large quantities, intensifying the chemical reaction. No enlarged through cracks appeared during the entire test cycle, indicating that the concrete has good resistance to sulfate erosion.

[0107] The above is only a preferred solution for the implementation of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent replacement, etc. made within the spirit and scope of the present invention shall be included in the protection scope of the present invention.

Claims

1. A concrete, characterized in that: The concrete is concrete mixed with ultra-high molecular weight polyethylene fibers; the concrete comprises: Component 1: comprising the following raw materials in parts by weight: 360-400 parts of cement, 160-200 parts of fly ash, 22-38 parts of silica fume, 360-400 parts of quartz sand, 12-28 parts of latex powder, 1.8-4.3 parts of polyvinyl alcohol powder, 38-63 parts of air entraining agent; and; Component 2: ultra-high molecular weight polyethylene fiber; the blending amount of the ultra-high molecular weight polyethylene fiber is 5-10wt‰ of component 1.

2. The concrete according to claim 1, characterized in that The concrete comprises: Component 1: comprising the following raw materials in parts by weight: 370-390 parts of cement, 170-190 parts of fly ash, 25-35 parts of silica powder, 370-390 parts of quartz sand, 15-25 parts of latex powder, 2-4 parts of polyvinyl alcohol powder, 40-60 parts of air entraining agent; and; Component 2: ultra-high molecular weight polyethylene fiber; the blending amount of the ultra-high molecular weight polyethylene fiber is 6-8wt‰ of component 1.

3. The concrete according to claim 1 or 2, characterized in that: The ultra-high molecular weight polyethylene fiber has a density of 0.97 to 0.98 g / cm 3 , strength is 2.8~4N / tex, modulus is 91~140N / tex, and elongation is 3.5%~3.7%.

4. The concrete according to claim 1 or 2, characterized in that: The specific gravity of the silicon powder is 2.2-2.5 g / cm 3 , the average particle size is 0.1~0.2μm.

5. The concrete according to claim 1 or 2, characterized in that: The latex powder includes at least one of ethylene / vinyl acetate copolymer, vinyl acetate / versatate copolymer and acrylic copolymer.

6. The concrete according to claim 1 or 2, characterized in that: The air entraining agent includes at least one of rosin derivatives, sodium alkyl sulfonate, and sodium alkylbenzene sulfonate.

7. The concrete construction method according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, mixing, crushing and sieving various raw materials of component 1 to obtain concrete premix powder; Step 2, crushing the ultra-high molecular weight polyethylene fiber of component 2 to obtain ultra-high molecular weight polyethylene fiber with a length of 12-15 mm; Step 3: Add water to the concrete premix, then add 12-15 mm ultra-high molecular weight polyethylene fibers, mix well, and then carry out construction.

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