A kind of anti-erosion, anti-cracking concrete material for mass concrete engineering

Abstract

The present application belongs to a kind of anti-corrosion, anti-crack concrete material for mass concrete engineering;Components and mass fraction are as follows: high iron phase cement 225-378 parts;Fluoroaluminate cement 5-12 parts;Ternary component admixture 158-215 parts;Three-level coarse aggregate 936-1077 parts;Two-level fine aggregate 630-837 parts;The initial slump of prepared concrete material is 180-210mm, 56d compressive strength is 10%-15% more, 7d hydration heat is between 170-210kJ / kg, adiabatic temperature rise is less than 50℃, electric flux is between 600-700C, chloride ion diffusion coefficient is less than 1.8*10 ‑12 m 2 / s, sulphate attack resistance grade is higher than KS90, shrinkage value is less than 300μm / m, which improves the durability and service life of C45-C80 mass concrete structure under high corrosion environment.

Description

Technical Field

[0001] This invention belongs to the field of concrete materials technology, specifically relating to a corrosion-resistant and crack-resistant concrete material for large-volume concrete engineering. Background Technology

[0002] Large-volume concrete structures are indispensable in modern urbanization and infrastructure construction, characterized by their massive size, with the smallest solid dimension being greater than or equal to 1 meter. For example, the foundation slab of the Shanghai Tower's main building has an area of ​​11,493 square meters and a thickness of 6 meters, requiring a concrete volume of 61,000 cubic meters. Currently, the highest single-pour volume achieved in China has reached 25,000 cubic meters, while the strength of high-strength concrete can reach C80 or higher, and the compressive strength of high-performance concrete can reach over 100 MPa. These building structures are characterized by their ultra-long length, ultra-deep thickness, high-grade concrete materials, and unique geographical environments. In particular, when constructing large-volume concrete structures in harsh geographical environments, the requirements for corrosion resistance and crack resistance are extremely high.

[0003] According to GB 50021-2001 "Code for Geotechnical Investigation", when the environmental type is Class II and there is no alternating wet and dry conditions, water and soil with a sulfate content greater than 390 mg / L will cause different levels of corrosion to concrete. In this environment, chloride ions in water have virtually no effect on the corrosion of reinforcing steel, while chloride ions in soil above 400 mg / L will cause corrosion to the reinforcing steel. Currently, the evaluation of the chloride ion penetration resistance of concrete in China mainly uses two indicators: electrical flux and chloride ion permeability coefficient. Typical values ​​for electrical flux are between 800 and 4000°C, and chloride ion permeability coefficients are generally between 2 × 10⁻⁶. -12 ~5×10 -12 m 2 / s, the smaller the value, the better the impermeability. In China, the maximum number of wet-dry cycles that concrete can withstand in alternating wet and dry environments is mainly used to represent the sulfate resistance of concrete, with typical grades ranging from KS30 to KS90. Generally, the crack resistance of mass concrete is evaluated based on its free drying shrinkage value. According to GB 50204-2017 "Code for Acceptance of Construction Quality of Concrete Structures", the free drying shrinkage value of concrete at 28 days should not exceed 600 μm / m.

[0004] Mass concrete releases a large amount of heat during the hydration process due to the large amount of pouring, which causes temperature changes in the structure and further causes the generation of temperature stress, which is extremely prone to various structural cracks, affects the mechanical properties and durability performance such as corrosion resistance and crack resistance of the concrete material itself, and threatens the safety of the overall structure. In order to reduce the hydration heat of ordinary Portland cement mass concrete and improve the corrosion resistance, a large amount of mineral admixture is usually used to effectively prevent chloride ion penetration and reduce the electric flux of concrete. Mineral admixture can reduce the cement content, slow down the internal temperature rise of mass concrete, and reduce the temperature gradient. However, the hydration speed of mineral admixture is slower than that of ordinary Portland cement, and there are problems such as inconsistent quality and source, so there may be a case of poor adaptability of mineral admixture to ordinary Portland cement.

[0005] In view of the poor crack resistance of mass concrete materials prepared from ordinary Portland cement, in the material selection and mix proportion design stage, patent CN113831088A uses high-thermal-conductivity nano-scale microcapsule phase change material to slow down the internal temperature rise of mass concrete, reduce the temperature gradient, and improve the crack resistance of mass concrete, but does not mention the hydration heat of cementitious materials, so it cannot be judged whether it meets the requirements of the “Ordinary Concrete Mix Proportion Design Regulations”. Patent CN112979239A avoids the problem of cracks caused by large temperature difference inside and outside the concrete by regulating the function type composite admixture, but the preparation process of the composite admixture is relatively complicated, which undoubtedly increases the construction cost and construction difficulty, and the aggregate gradation is not optimized, which cannot guarantee the maximum apparent density of concrete, and the actual shrinkage of concrete is not reported. SUMMARY

[0006] In view of the above-mentioned shortcomings of the prior art, the main purpose of the present application is to provide an anti-corrosion and anti-crack concrete material for mass concrete engineering. To achieve this purpose, the present application provides an anti-corrosion and anti-crack concrete material for mass concrete engineering, which uses high-iron cement, fluoroaluminate cement, ternary component admixture, and optimized three-level coarse aggregate and two-level fine aggregate to prepare the concrete material. The C4AF content in high-iron cement is high, and its hydration product phase [C3(A,F)H6, C-A-S-H] can prevent cracking and improve corrosion resistance; the F component in fluoroaluminate cement improves the activity of high-content C2S in high-iron cement, and the hydration product phase C-S-H is continuously generated, which has good sulfate resistance and micro-expansion, which is beneficial to improving the crack resistance; the ternary component admixture can release the hydration heat, and the step-by-step hydration can greatly improve the pore structure, corrosion resistance and crack resistance; the three-level coarse aggregate and two-level fine aggregate optimize the overall gradation of mass concrete and reduce shrinkage, thereby improving the crack resistance, and the comprehensive utilization effectively prolongs the service life of C45-C80 mass concrete structure.

[0007] The present application is realized by the following technical solutions:

[0008] A mass concrete engineering corrosion-resistant, anti-crack concrete material, the components and mass fraction of the material include: high iron phase cement 225-378 parts; fluoroaluminate cement 5-12 parts; ternary component admixture 158-215 parts; three-level coarse aggregate 936-1077 parts; two-level fine aggregate 630-837 parts.

[0009] The ternary component admixture includes: fly ash 88-150 parts, slag powder 40-88 parts and expanding agent 20-30 parts; the fly ash selects high-quality fly ash above grade II; the ternary component admixture is ground for 10-300 min, the grinding mill rotates at 10-500 rpm, and the specific surface area of the ground admixture is 400-800 m 2 / g.

[0010] The specific surface area of the slag powder is 500-800 m 2 / kg; the expanding agent includes the following mass fractions: expanding component 80-88 parts, hydration temperature rise inhibitor 7-17 parts, and steel rust inhibitor 3-5 parts, and the total mass of the three is 100 parts.

[0011] The three-level coarse aggregate includes: 5-10 mm stone 123-160 parts, 10-20 mm stone 795-867 parts, and 20-31.5 mm stone 18-50 parts; the coarse aggregate material is one or more of granite, tuff, limestone, or pebble composite, which is hard, clean, and free of weathered particles, and nearly cubic particles.

[0012] The two-level fine aggregate includes: medium sand 142-267 parts, and coarse sand 488-570 parts; the two-level fine aggregate uses one or both of machine-made sand or river sand with a particle size of medium sand and coarse sand.

[0013] The mass fraction of C4AF in the high iron phase cement is 18%-25%, and the mass fraction of C3A is 0-2%.

[0014] The mass fraction of C 11 A7·CaF2 in the fluoroaluminate cement is 71%-79%, and the mass fraction of C2S is 14%-22%.

[0015] The fluoroaluminate cement replaces the high iron phase cement at a dosage of 2%-8% by mass.

[0016] The preparation method of the concrete material is as follows: the three-grade coarse aggregate and the two-grade fine aggregate are mixed and stirred according to the designed mixing ratio, and the first mixture is obtained after stirring for 1 min to 3 min; the ternary component admixture is mixed and ground for 10 min to 300 min, the grinding machine rotates at a speed of 10 rpm to 500 rpm, and the specific surface area of the admixture after grinding is controlled to be between 400 m 2 / g and 800 m 2 / g, and the second mixture is obtained; the high-iron phase cement, the fluoroaluminate cement and the second mixture are pre-mixed in a mixing tank at a speed of 200 rpm to 500 rpm for 10 min to 30 min, and then the first mixture is added and stirred uniformly for 1 min to 2 min, and the third mixture is obtained; water and water reducing agent are added into the third mixture, and stirred for 3 min to 5 min, and the anti-erosion and anti-cracking concrete material for mass concrete engineering is obtained.

[0017] The concrete material prepared by the method has an initial slump of 180 to 210 mm, a 56d compressive strength of 10% to 15% or more, a 7d hydration heat of 170 to 210 kJ / kg, an adiabatic temperature rise of less than 50 DEG C, an electric flux of 600 to 700 C, a chloride ion diffusion coefficient of less than 1.8*10 -12 m 2 / s, and a sulfate erosion resistance grade of more than KS90, and a shrinkage value of less than 300 mu m / m.

[0018] The concrete material prepared by the method is used for C45 to C80 mass concrete structural material.

[0019] The specific description is as follows:

[0020] The application provides an anti-erosion and anti-cracking concrete material for mass concrete engineering, which is characterized by comprising the following raw materials:

[0021] The high-iron phase cement, the fluoroaluminate cement, the ternary component admixture, the three-grade coarse aggregate and the two-grade fine aggregate are used in the following mass fractions:

[0022] The high-iron phase cement is 225 to 378 parts, the fluoroaluminate cement is 5 to 12 parts, the ternary component admixture is 158 to 215 parts, wherein the fly ash is 88 to 150 parts, the slag powder is 40 to 88 parts, and the expansive agent is 20 to 30 parts; the three-grade coarse aggregate is 936 to 1077 parts, wherein the 5 to 10 mm stone is 123 to 160 parts, the 10 to 20 mm stone is 795 to 867 parts, and the 20 to 31.5 mm stone is 18 to 50 parts; the two-grade fine aggregate is 630 to 837 parts, wherein the medium sand is 142 to 267 parts, and the coarse sand is 488 to 570 parts.

[0023] The high-ferrous phase cement has a C4AF mass fraction of 18%–25%, a C3A mass fraction of 0%–2%, a 3-day compressive strength of 23–26 MPa, a 28-day compressive strength of 50–55 MPa, a 7-day heat of hydration of 200–230 kJ / kg, and a 28-day chloride ion diffusion coefficient of 40 × 10⁻⁶ kJ / kg. -14 ~60×10 -14 m 2 / s, 28d sulfate resistance coefficient between 1.1 and 1.2, drying shrinkage between 500×10 -6 ~600×10 -6 .

[0024] C in fluoroaluminate cement 11 The mass fraction of A7·CaF2 is between 71% and 79%, and the mass fraction of C2S is between 14% and 22%. The fluoroaluminate cement replaces the high-ferric phase cement at a mass fraction of 2% to 8%.

[0025] The ternary component admixture is a composite of fly ash, slag powder and an expanding agent.

[0026] The fly ash used is high-quality fly ash of grade II or above. The specific surface area of ​​the slag powder is between 500 and 800 m². 2 / kg. The expanding agent comprises the following components in parts by weight: 80-88 parts of expanding component, 7-17 parts of hydration temperature rise inhibitor, and 3-5 parts of steel reinforcement rust inhibitor, with a total mass of 100 parts.

[0027] The ternary component blend was mixed and milled for 10–300 min at a mill speed of 10–500 rpm, and the specific surface area of ​​the milled blend was between 400 and 800 m². 2 / g.

[0028] The three-grade coarse aggregate is composed of stones of 5-10mm, 10-20mm and 20-31.5mm.

[0029] The coarse aggregate is a composite of one or more crushed stones or pebbles from granite, tuff, and limestone that are hard, clean, and free of weathered particles and have near-cubic-sized particles. The loose packing porosity of the three-graded coarse aggregate is ≤43%.

[0030] The secondary fine aggregate is made of one or both of manufactured sand and river sand, with a particle size of medium and coarse sand. The apparent density of the medium and coarse sand is ≥2700 kg / m³. 3 The loose packing porosity of the secondary fine aggregate is ≤44%.

[0031] The preparation method of the concrete material is as follows: the three-stage coarse aggregate and the two-stage fine aggregate are mixed and stirred according to the proposed mixing ratio, and the first mixture is obtained after stirring for 1 min to 3 min; the ternary component admixture is mixed and ground for 10 min to 300 min, the grinding machine speed is 10 rpm to 500 rpm, and the specific surface area of the admixture after grinding is controlled to be between 400 m 2 / g and 800 m 2 / g, and the second mixture is obtained; the high-iron phase cement, the fluoroaluminate cement and the second mixture are pre-mixed in a mixing tank at a speed of 200 rpm to 500 rpm for 10 min to 30 min, and then the first mixture is added and stirred uniformly for 1 min to 2 min to obtain the third mixture; water and water reducing agent are added to the third mixture and stirred for 3 min to 5 min, and the anti-erosion and anti-cracking concrete material for mass concrete engineering is obtained.

[0032] The slump and compressive strength of the mass concrete material are tested according to GB / T 50081-2011 “Standard Test Methods for Mechanical Properties of Ordinary Concrete”; the hydration heat is tested according to GB / T 12959-2008 “Determination of Hydration Heat of Cement”; the adiabatic temperature rise is calculated according to GB 50496-2018 “Standard for Construction of Mass Concrete”; the chloride ion penetration resistance and shrinkage of the concrete are tested according to the relevant requirements of GB / T 50082-2009 “Standard Test Methods for Long-term Performance and Durability of Ordinary Concrete”; the test piece for chloride ion penetration resistance is a Φ100mm×50mm concrete test block after standard curing for 28d; the sulfate resistance grade of the concrete is determined according to GB / T 50082-2009 “Standard Test Methods for Long-term Performance and Durability of Ordinary Concrete”, and the test piece is a 100mm×100mm×100mm cubic concrete test block after standard curing for 28d and dry-wet cycles; the XRD is used to test the phase composition of the hydration product by using the Empyrean X-ray diffractometer of the Netherlands Panalytical Company; and the SEM is used to test the morphology of the hydration product of the concrete material by using the field emission scanning electron microscope of FEI Company in the United States.

[0033] The anti-erosion and anti-cracking concrete material for mass concrete engineering has excellent working performance and durability. The initial slump of the prepared concrete material is 180mm to 210mm, the 56d compressive strength is 10% to 15% more than the standard, the 7d hydration heat is 170kJ / kg to 210kJ / kg, the adiabatic temperature rise is less than 50℃, the electric flux is 600C to 700C, and the chloride ion diffusion coefficient is less than 1.8×10 -12 m 2The sulfate corrosion resistance grade is higher than KS90, the shrinkage is lower than 300 mu m / m, and the hydration product contains more C-A-S-H gel and C3(A,F)H6, which is beneficial to improve the durability and service life of C45-C80 mass concrete structure in high corrosion environment.

[0034] Compared with the prior art, the beneficial effects of the present application are:

[0035] 1. The content of high-iron phase cement C4AF is significantly higher than that of ordinary portland cement, the hydration heat release is lower than that of ordinary portland cement, the shrinkage is small, and the anti-cracking performance is improved. And a large amount of C3(A,F)H6 and C-A-S-H gel exists in the hydration product, which effectively improves the corrosion resistance of mass concrete structure. C3(A,F)H6 has larger particle size, and the contact area with SO4 2- is relatively small. In the process of sulfate corrosion, not only more ettringite can be generated, but also a dense wrapping layer can be formed on the unreacted particles, delaying the effect of sulfate corrosion; C-A-S-H gel has longer average molecular chain length than ordinary C-S-H gel, and has better adsorption and solidification effect on Cl - .

[0036] 2. The fluorine aluminates cement can produce more C3AH6 and aluminum gel and other hydration products after hydration, which effectively resists the corrosion of SO4 2- , Cl - and other ions. And the content of C 11 A7.CaF2 in fluorine aluminates cement is more than 70%, which improves the activity of high content C2S in high-iron phase cement under the action of a large amount of F component, and promotes the hydration of C2S in the middle and later stages due to its high early strength, prolongs the generation of C-S-H gel, and provides an innovative choice for the corrosion resistance and crack resistance of mass concrete materials from the source.

[0037] 3. The three-level coarse aggregate of 5-10mm, 10-20mm and 20-31.5mm is matched with the secondary fine aggregate with apparent density greater than 2700kg / m 3 . The overall grading of mass concrete is optimized under this design ratio. The aggregate packing density is the largest, which can ensure that the mass concrete material has the largest bulk density, good volume stability and dense effect, which is beneficial to reduce the amount of cement paste, effectively inhibit the self-shrinkage and drying shrinkage of mass concrete material, and thus improve the crack resistance of mass concrete material.

[0038] 4. The addition of a ternary admixture consisting of fly ash, slag powder, and an expansive agent to high-ferrous phase cement fully leverages the synergistic effect between the cement and the admixture. This extends the setting time of high-ferrous phase cement mass concrete, slows down the release of hydration heat in the concrete materials, and reduces temperature cracks caused by hydration heat. The dosage of fly ash, slag powder, and expansive agent has a significant impact on concrete performance. Because fly ash has a smaller specific surface area than cement, excessive dosage leads to increased water demand, requiring more admixtures and mixing water; insufficient dosage shortens the concrete setting time, increases hydration heat release, and slows the increase in concrete strength. Similarly, both excessive and insufficient slag powder can prolong the concrete setting time, reduce strength, and decrease impermeability. Excessive expansive agent leads to decreased strength and increased later-stage shrinkage; insufficient agent results in insignificant expansion and decreased stability. A ternary admixture, consisting of 88-150 parts fly ash, 40-88 parts slag powder, and 20-30 parts expansive agent, is mixed and ground to form a sequential hydration process, enabling the continuous generation of high-quality, high-density hydration products. The hydration of fly ash and slag powder consumes calcium hydroxide, lowering the system's alkalinity. The introduced Al and Fe will form CASH gel, and a large amount of Fe will replace some Al in the hydration products to form C3(A,F)H6, reducing the number of large capillary pores and pores that are detrimental to corrosion and crack resistance, while increasing the number of gel pores and small capillary pores. The addition of a certain amount of expansive agent compensates for shrinkage to prevent cracking caused by temperature rise in the concrete. This comprehensively improves the structure's strength and durability, including resistance to chloride ion and sulfate attack.

[0039] 5. By combining key materials such as high-ferrous phase cement, fluoroaluminate cement, three-grade coarse aggregate, two-grade fine aggregate, and ternary component admixtures, the prepared concrete material has an initial slump of 180–210 mm, a 56-day compressive strength exceeding 10%–15%, a 7-day heat of hydration of 170–210 kJ / kg, an adiabatic temperature rise of less than 50°C, an electrical flux of 600–700°C, and a chloride ion diffusion coefficient of less than 1.8 × 10⁻⁶ kJ / kg. -12 m 2 / s, with sulfate resistance levels higher than KS90 and shrinkage values ​​below 300μm / m, significantly improving the corrosion resistance, crack resistance, and service life of C45~C80 large-volume concrete structures under harsh environments such as high corrosion. Attached Figure Description

[0040] Figure 1 The graph shows the slump test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4.

[0041] Figure 2 The graph shows the 28-day and 56-day compressive strength test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4. Figure 3Cumulative heat release and adiabatic temperature rise test results of concrete materials prepared for Examples 1-10 and Comparative Examples 1-4 Figure 4 Chloride ion diffusion coefficient and electric flux test results of concrete materials prepared for Examples 1-10 and Comparative Examples 1-4

[0042] Figure 5 Sulfate attack resistance level test results of concrete materials prepared for Examples 1-10 and Comparative Examples 1-4

[0043] Figure 6 Shrinkage value test results of concrete materials prepared for Examples 1-10 and Comparative Examples 1-4

[0044] Figure 7 XRD patterns of hydration products of concrete materials prepared for Example 1 and Example 4 after 28d and 56d of curing

[0045] Figure 8 SEM image of concrete material prepared for Example 4 at 28d

[0046] Figure 9 SEM image of concrete material prepared for Example 4 at 56d DETAILED DESCRIPTION

[0047] To further clarify the technical means and effects taken by the present application to achieve the intended purpose, the following summarizes the preferred embodiments, which are a kind of corrosion-resistant and crack-resistant concrete material for mass concrete engineering according to the present application, and the specific implementation, features and effects thereof are described in detail as follows. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not intended to limit the present application.

[0048] Example 1

[0049] A kind of corrosion-resistant and crack-resistant concrete material for mass concrete engineering, design strength grade C45, including the following raw materials, by mass fraction: high-iron phase cement 225 parts;Fluoroaluminate cement 5 parts;Ternary component admixture 206 parts, wherein, fly ash 88 parts, slag powder 88 parts, expanding agent 30 parts;Three-level coarse aggregate 1077 parts, wherein, 5-10mm gravel 160 parts, 10-20mm gravel 867 parts, 20-31.5mm gravel 50 parts;Two-level fine aggregate 837 parts, wherein, medium sand 267 parts, coarse sand 570 parts;Water reducing agent 7.28 parts;Water 140 parts. And in the expanding agent, expansion component 80 parts, hydration temperature rise inhibitor 17 parts, steel rust inhibitor 3 parts. Ternary component admixture is mixed and ground for 45min, and the mill speed is 300rpm.

[0050] The preparation method of the concrete material is as follows: the three-grade coarse aggregate and the two-grade fine aggregate are mixed and stirred according to the mixing proportion, and stirring is performed for 3 min to obtain a first mixture; the ternary component admixture is mixed and ground for 300 min, the grinding machine rotates at 500 rpm, and the specific surface area of the admixture after grinding is controlled to be 800 m 2 / g, to obtain a second mixture; the high-iron-phase cement, the fluoroaluminate cement, the second mixture and other powders are pre-mixed in a mixing tank at a rotating speed of 500 rpm for 30 min, and then the first mixture is added and stirred uniformly for 2 min to obtain a third mixture; water and a water reducing agent are added into the third mixture, and stirring is performed for 5 min, thereby obtaining the corrosion-resistant and crack-resistant concrete material for mass concrete engineering.

[0051] Example 2

[0052] A corrosion-resistant and crack-resistant concrete material for mass concrete engineering with a design strength grade C45 comprises the following raw materials in parts by mass: 225 parts of high-iron-phase cement, 12 parts of fluoroaluminate cement, 210 parts of ternary component admixture, 936 parts of three-grade coarse aggregate, 630 parts of two-grade fine aggregate, 7.56 parts of water reducing agent and 150 parts of water, wherein the ternary component admixture comprises 150 parts of fly ash, 40 parts of slag powder and 20 parts of expansive agent, the three-grade coarse aggregate comprises 123 parts of 5-10 mm gravel, 795 parts of 10-20 mm gravel and 18 parts of 20-31.5 mm gravel, and the two-grade fine aggregate comprises 142 parts of medium sand and 488 parts of coarse sand; the expansive agent comprises 88 parts of expansive component, 7 parts of hydration temperature rise inhibitor and 5 parts of anti-rust agent for reinforcing steel bars; and the ternary component admixture is mixed and ground for 45 min at a rotating speed of 300 rpm.

[0053] The preparation method of the concrete material is as follows: the three-grade coarse aggregate and the two-grade fine aggregate are mixed and stirred according to the mixing proportion, and stirring is performed for 2 min to obtain a first mixture; the ternary component admixture is mixed and ground for 150 min, the grinding machine rotates at 250 rpm, and the specific surface area of the admixture after grinding is controlled to be 590 m 2 / g, to obtain a second mixture; the high-iron-phase cement, the fluoroaluminate cement, the second mixture and other powders are pre-mixed in a mixing tank at a rotating speed of 350 rpm for 20 min, and then the first mixture is added and stirred uniformly for 1.5 min to obtain a third mixture; water and a water reducing agent are added into the third mixture, and stirring is performed for 4 min, thereby obtaining the corrosion-resistant and crack-resistant concrete material for mass concrete engineering.

[0054] Example 3

[0055] The anti-erosion and anti-crack concrete material for mass concrete engineering has a design strength grade C45 and comprises the following raw materials in parts by mass: high-iron-phase cement 240 parts; fluoroaluminate cement 5 parts; ternary component admixture 205 parts, wherein fly ash 130 parts, slag powder 50 parts and expanding agent 25 parts; three-grade coarse aggregate 1050 parts, wherein 5-10 mm gravel 150 parts, 10-20 mm gravel 850 parts and 20-31.5 mm gravel 50 parts; two-grade fine aggregate 760 parts, wherein medium sand 254 parts and coarse sand 506 parts; water reducing agent 7.43 parts; and water 150 parts. In the expanding agent, expanding component 84 parts, hydration temperature rise inhibitor 12 parts and steel rust inhibitor 4 parts. The ternary component admixture is mixed and ground for 45 min at a mill speed of 300 rpm.

[0056] The preparation method of the concrete material is as follows: the three-grade coarse aggregate and the two-grade fine aggregate are mixed and stirred according to the mixing ratio to obtain a first mixture; the ternary component admixture is mixed and ground for 10 min at a mill speed of 10 rpm, and the specific surface area of the admixture after grinding is controlled to be 400 m 2 / g, to obtain a second mixture; the high-iron-phase cement, the fluoroaluminate cement and the second mixture are pre-mixed in a mixing tank at a speed of 200 rpm for 10 min, and then the first mixture is added and stirred uniformly for 1 min to obtain a third mixture; water and the water reducing agent are added to the third mixture and stirred for 3 min to obtain the anti-erosion and anti-crack concrete material for mass concrete engineering.

[0057] Example 4

[0058] The anti-erosion and anti-crack concrete material for mass concrete engineering has a design strength grade C60 and comprises the following raw materials in parts by mass: high-iron-phase cement 290 parts; fluoroaluminate cement 10 parts; ternary component admixture 190 parts, wherein fly ash 100 parts, slag powder 70 parts and expanding agent 20 parts; three-grade coarse aggregate 1068 parts, wherein 5-10 mm gravel 160 parts, 10-20 mm gravel 867 parts and 20-31.5 mm gravel 41 parts; two-grade fine aggregate 712 parts, wherein medium sand 142 parts and coarse sand 570 parts; water reducing agent 10.34 parts; and water 150 parts. In the expanding agent, expanding component 82 parts, hydration temperature rise inhibitor 13 parts and steel rust inhibitor 5 parts. The ternary component admixture is mixed and ground for 60 min at a mill speed of 400 rpm.

[0059] The preparation method of the concrete material is as follows: the three-grade coarse aggregate and the two-grade fine aggregate are mixed and stirred according to the mixing ratio to obtain a first mixture; the ternary component admixture is mixed and ground for 10 min at a mill speed of 10 rpm, and the specific surface area of the admixture after grinding is controlled to be 400 m2 The high-iron phase cement, the fluoroaluminate cement, the second mixture and the like powder materials are pre-mixed in a mixing tank at a rotation speed of 200 rpm for 10 min, and then added into the first mixture to be stirred uniformly, and stirred for 1 min to obtain a third mixture. Water and a water reducing agent are added into the third mixture to be stirred for 3 min, thereby obtaining the corrosion-resistant and crack-resistant concrete material for mass concrete engineering.

[0060] Example 5

[0061] A corrosion-resistant and crack-resistant concrete material for mass concrete engineering with a design strength grade of C60 comprises the following raw materials in parts by mass: high-iron phase cement 277 parts; fluoroaluminate cement 12 parts; ternary component admixture 210 parts, wherein fly ash 100 parts, slag powder 88 parts and expansive agent 22 parts; three-level coarse aggregate 1077 parts, wherein 5-10 mm gravel 160 parts, 10-20 mm gravel 867 parts and 20-31.5 mm gravel 50 parts; two-level fine aggregate 837 parts, wherein medium sand 267 parts and coarse sand 570 parts; water reducing agent 9.69 parts; and water 155 parts. In the expansive agent, expansive component 83 parts, hydration temperature rise inhibitor 14 parts and steel rust inhibitor 3 parts. The ternary component admixture is mixed and ground for 60 min at a mill rotation speed of 400 rpm.

[0062] The preparation method of the concrete material is as follows: the three-level coarse aggregate and the two-level fine aggregate are mixed and stirred according to the mixing ratio, and stirred for 3 min to obtain a first mixture; the ternary component admixture is mixed and ground for 250 min at a mill rotation speed of 500 rpm, and the specific surface area of the admixture after grinding is controlled to be 700 m 2 The high-iron phase cement, the fluoroaluminate cement, the second mixture and the like powder materials are pre-mixed in a mixing tank at a rotation speed of 200 rpm for 10 min, and then added into the first mixture to be stirred uniformly, and stirred for 1 min to obtain a third mixture. Water and a water reducing agent are added into the third mixture to be stirred for 3 min, thereby obtaining the corrosion-resistant and crack-resistant concrete material for mass concrete engineering.

[0063] Example 6

[0064] A kind of anti-erosion, anti-crack concrete material for mass concrete engineering, design strength grade C70, including following raw materials, by mass fraction: high-iron phase cement 368 parts;Fluoroaluminate cement 10 parts;Ternary component admixture 158 parts, wherein, fly ash 88 parts, slag powder 40 parts, expanding agent 30 parts;Three-level coarse aggregate 936 parts, wherein, 5-10mm gravel 123 parts, 10-20mm gravel 795 parts, 20-31.5mm gravel 18 parts;Two-level fine aggregate 630 parts, wherein, medium sand 142 parts, coarse sand 488 parts;Water reducing agent 11.25 parts;Water 145 parts.And in the expanding agent, expansion component 86 parts, hydration temperature inhibitor 10 parts, steel rust inhibitor 4 parts.Ternary component admixture is mixed with 70 min of grinding, mill speed is 450 rpm.

[0065] The preparation method of the concrete material is as follows: according to the mixing proportion, the three-level coarse aggregate and the two-level fine aggregate are mixed and stirred to obtain a first mixture; the ternary component admixture is mixed and ground for 15 min, the mill speed is 200 rpm, and the specific surface area of the admixture after grinding is controlled to be 500 m 2 / g, to obtain a second mixture; the high-iron phase cement, the fluoroaluminate cement and the second mixture are pre-mixed in a mixing tank at a speed of 230 rpm for 15 min, and then the first mixture is added and stirred uniformly for 2 min to obtain a third mixture; water and water reducing agent are added to the third mixture and stirred for 3 min, to obtain an anti-erosion and anti-crack concrete material for mass concrete engineering.

[0066] Example 7

[0067] A kind of anti-erosion, anti-crack concrete material for mass concrete engineering, design strength grade C70, including following raw materials, by mass fraction: high-iron phase cement 331 parts;Fluoroaluminate cement 8 parts;Ternary component admixture 205 parts, wherein, fly ash 100 parts, slag powder 80 parts, expanding agent 25 parts;Three-level coarse aggregate 960 parts, wherein, 5-10mm gravel 144 parts, 10-20mm gravel 795 parts, 20-31.5mm gravel 21 parts;Two-level fine aggregate 760 parts, wherein, medium sand 217 parts, coarse sand 543 parts;Water reducing agent 10.66 parts;Water 147 parts.And in the expanding agent, expansion component 87 parts, hydration temperature inhibitor 8 parts, steel rust inhibitor 5 parts.Ternary component admixture is mixed with 70 min of grinding, mill speed is 450 rpm.

[0068] The preparation method of the concrete material is as follows: according to the mixing proportion, the three-level coarse aggregate and the two-level fine aggregate are mixed and stirred to obtain a first mixture; the ternary component admixture is mixed and ground for 15 min, the mill speed is 200 rpm, and the specific surface area of the admixture after grinding is controlled to be 500 m2 The high-iron phase cement, the fluoroaluminate cement, the second mixture and the like powder materials are pre-mixed in a mixing tank at a rotation speed of 400 rpm for 30 min, then the first mixture is added and stirred uniformly, stirred for 2 min to obtain a third mixture; water, a water reducing agent and the like are added into the third mixture, stirred for 4 min, thereby obtaining the corrosion-resistant and crack-resistant concrete material for mass concrete engineering.

[0069] Example 8

[0070] A corrosion-resistant and crack-resistant concrete material for mass concrete engineering with a design strength grade C80 comprises the following raw materials in parts by mass: high-iron phase cement 378 parts; fluoroaluminate cement 5 parts; ternary component admixture 206 parts, wherein fly ash 88 parts, slag powder 88 parts and expansive agent 30 parts; three-level coarse aggregate 1077 parts, wherein 5-10 mm gravel 160 parts, 10-20 mm gravel 867 parts and 20-31.5 mm gravel 50 parts; two-level fine aggregate 837 parts, wherein medium sand 267 parts and coarse sand 570 parts; water reducing agent 12.56 parts; and water 145 parts. In the expansive agent, expansive component 80 parts, hydration temperature rise inhibitor 17 parts and steel rust inhibitor 3 parts. The ternary component admixture is mixed and ground for 90 min at a mill rotation speed of 500 rpm.

[0071] The preparation method of the concrete material is as follows: the three-level coarse aggregate and the two-level fine aggregate are mixed and stirred according to the mixing ratio, stirred for 3 min to obtain a first mixture; the ternary component admixture is mixed and ground for 300 min at a mill rotation speed of 500 rpm, and the specific surface area of the admixture after grinding is controlled to be 800 m 2 The high-iron phase cement, the fluoroaluminate cement, the second mixture and the like powder materials are pre-mixed in a mixing tank at a rotation speed of 400 rpm for 30 min, then the first mixture is added and stirred uniformly, stirred for 2 min to obtain a third mixture; water, a water reducing agent and the like are added into the third mixture, stirred for 4 min, thereby obtaining the corrosion-resistant and crack-resistant concrete material for mass concrete engineering.

[0072] Example 9

[0073] The anti-erosion and anti-crack concrete material for mass concrete engineering has a design strength grade C80 and comprises the following raw materials in parts by mass: high-iron-phase cement 370 parts, fluoroaluminate cement 9 parts, ternary component admixture 215 parts (of which, fly ash 110 parts, slag powder 80 parts and expanding agent 25 parts), three-grade coarse aggregate 984 parts (of which, 5-10 mm gravel 135 parts, 10-20 mm gravel 823 parts and 20-31.5 mm gravel 26 parts), two-grade fine aggregate 746 parts (of which, medium sand 247 parts and coarse sand 499 parts), water reducing agent 13.83 parts and water 145 parts. In the expanding agent, the expansion component is 84 parts, the hydration temperature rising inhibitor is 12 parts and the steel rust inhibitor is 4 parts. The ternary component admixture is mixed and ground for 90 min at a mill speed of 500 rpm.

[0074] The preparation method of the concrete material is as follows: the three-grade coarse aggregate and the two-grade fine aggregate are mixed and stirred according to the mixing proportion, and the first mixture is obtained after stirring for 2 min; the ternary component admixture is mixed and ground for 150 min at a mill speed of 250 rpm, and the specific surface area of the admixture after grinding is controlled to be 590 m 2 / g, and the second mixture is obtained; the high-iron-phase cement, the fluoroaluminate cement and the second mixture are pre-mixed in a mixing tank at a speed of 350 rpm for 30 min, and then the first mixture is added and uniformly stirred for 1.5 min to obtain the third mixture; water and the water reducing agent are added into the third mixture, and the anti-erosion and anti-crack concrete material for mass concrete engineering is obtained after stirring for 4 min.

[0075] Example 10

[0076] The anti-erosion and anti-crack concrete material for mass concrete engineering has a design strength grade C80 and comprises the following raw materials in parts by mass: high-iron-phase cement 378 parts, fluoroaluminate cement 12 parts, ternary component admixture 210 parts (of which, fly ash 150 parts, slag powder 40 parts and expanding agent 20 parts), three-grade coarse aggregate 936 parts (of which, 5-10 mm gravel 123 parts, 10-20 mm gravel 795 parts and 20-31.5 mm gravel 18 parts), two-grade fine aggregate 630 parts (of which, medium sand 142 parts and coarse sand 488 parts), water reducing agent 13.83 parts and water 140 parts. In the expanding agent, the expansion component is 88 parts, the hydration temperature rising inhibitor is 7 parts and the steel rust inhibitor is 5 parts. The ternary component admixture is mixed and ground for 90 min at a mill speed of 500 rpm.

[0077] The preparation method of the concrete material is as follows: the three-grade coarse aggregate and the two-grade fine aggregate are mixed and stirred according to the mixing proportion, and the first mixture is obtained after stirring for 2 min; the ternary component admixture is mixed and ground for 150 min at a mill speed of 250 rpm, and the specific surface area of the admixture after grinding is controlled to be 590 m2 / g, to obtain a second mixture; the high-iron cement, the fluoroaluminate cement, the second mixture and the like powders are pre-mixed in a mixing tank at a rotation speed of 200 rpm for 10 min, then added into the first mixture and stirred uniformly, stirred for 1 min, to obtain a third mixture; water, a water reducing agent and the like are added into the third mixture, stirred for 3 min, to obtain an anti-erosion and anti-cracking concrete material for mass concrete engineering.

[0078] Comparative Example 1

[0079] The proportions in the patent CN 115417648 A “Preparation method of anti-erosion mass concrete” are adopted. Among them, the weight fractions of each raw material are as follows: PO 42.5 or low water heat cement 280 parts, grade II fly ash 45 parts, S95 slag powder 45 parts, heavy calcium powder (200 mesh) 30 parts, heavy calcium powder (400 mesh) 40 parts, heavy calcium powder (600 mesh) 30 parts, gravel 1010 parts, machine-made sand 798 parts, POM fiber 1.42 parts, water 162 parts, and retarder type polycarboxylic acid water reducing agent 4.5 parts.

[0080] Comparative Example 2

[0081] The proportions in the patent CN 110922122 B “Low water heat high strength mass concrete and preparation method thereof” are adopted. Among them, the weight of each component per cubic meter is as follows: ordinary portland cement 83 kg, mineral powder 332 kg, sand 850 kg, stone 900 kg, water 100 kg, crushed ice 50 kg, and composite additive 9.4 kg (additive components: self-made polycarboxylic acid water reducing agent 6 kg, sodium gluconate 1.2 kg, and cellulose ether 2.2 kg).

[0082] Comparative Example 3

[0083] The proportions in the patent CN 106747088 B “Low temperature rise corrosion resistant marine mass concrete and preparation method thereof” are adopted. Among them, the weight of each component per cubic meter is as follows: PO 42.5 cement 175 kg, fly ash 142 kg, mineral powder 139 kg, hydrophobic combined plug 20 kg, river sand 802 kg, gravel 1090 kg, water 147 kg, hydration accelerator 6.8 kg, and curing agent 22.4 kg.

[0084] Comparative Example 4

[0085] The proportions in the patent CN 114751691 B “Phase change mass concrete and preparation method thereof” are adopted. Among them, the weight fractions of each raw material are as follows: PO 42.5 cement 500 parts, phase change composition 60 parts, coarse aggregate 1150 parts, fine aggregate 800 parts, water 160 parts, and water reducing agent 4 parts.

[0086] The concrete materials prepared in Examples 1-10 and Comparative Examples 1-4 were cured for 28 days according to the same curing conditions, and then their performances were detected according to the relevant detection methods. The detection results are shown in the following tables and figures. Figures 1-9

[0087] Figure 1 The slump test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4 (1h slump of Comparative Example 1 and Comparative Example 3, and slump of Comparative Example 4 are not reported) are shown in the following figure. As shown in the figure, the initial slumps of the concrete materials in the examples are 180-210 mm, the 1h slumps change slightly, and the slump retention performance is excellent. However, the initial slumps of the concrete materials in the comparative examples are smaller than those in the examples, and the workability is poor. Figure 2 The 28d and 56d compressive strength test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4 (56d compressive strength of Comparative Example 1 and Comparative Example 4 is not reported) are shown in the following figure. As shown in the figure, the 28d and 56d compressive strengths of the concrete materials in the examples are far higher than the design strength requirements, and the strength values are 10%-15% more than the design strength requirements. However, the compressive strengths of the concrete materials in the comparative examples are lower. Figure 3 The cumulative heat release and adiabatic temperature rise test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4 (cumulative heat release of the comparative examples, and adiabatic temperature rise of Comparative Example 2 and Comparative Example 4 are not reported) are shown in the following figure. As shown in the figure, the 7d hydration cumulative heat release of the concrete materials in the examples is 170-210 kJ / kg, and the adiabatic temperature rise is lower than 50℃. However, the adiabatic temperature rise of Comparative Example 1 is higher than 70℃. Figure 4 The electric flux and chloride ion diffusion coefficient test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4 (electric flux of Comparative Examples 1-3, and chloride ion diffusion coefficient of Comparative Examples 2-4 are not reported) are shown in the following figure. As shown in the figure, the electric flux of the concrete materials in the examples is 600-700C, which is lower than the typical value of the electric flux, and the chloride ion diffusion coefficient is lower than 1.8x10 -12 m 2 / s. However, the electric flux of Comparative Example 4 is 750C, and the chloride ion diffusion coefficient of Comparative Example 1 is as high as 3.5x10 -12 m 2 / s. Figure 5 The sulfate attack resistance level test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4 (sulfate attack resistance coefficients of Comparative Examples 2 and 4 are not reported) are shown in the following figure. As shown in the figure, the sulfate attack resistance levels of the concrete materials in the examples are higher than KS90, and the sulfate attack resistance levels of Examples 8, 9, and 10 are as high as KS150. Figure 6 ​The shrinkage value test results of the concrete materials prepared in Examples 1-10 and Comparative Examples 1-4 (the shrinkage values of Comparative Example 2 and Comparative Example 4 are not reported) are shown in the figure. As can be seen from the figure, the shrinkage values of the present examples are lower than 300 μm / m, and the minimum shrinkage value can reach 92.63 μm / m, while the maximum shrinkage value in the comparative examples is as high as 279 μm / m. Figure 7 The XRD patterns of the hydration products of the concrete materials prepared in Example 1 and Example 4 after 28 d and 56 d curing. As can be seen from the figure, there are more C3(A,F)H6 at 28.3° and 36.4°. Figure 8 The SEM image of the concrete material prepared in Example 4 at 28 d, Figure 9 The SEM image of the concrete material prepared in Example 4 at 56 d. As can be seen from the figure, the micro-morphology in the present example is more compact. It is shown that the bulk concrete material of the present application has good comprehensive performance, stronger durability, excellent corrosion resistance and crack resistance performance compared with the conventional ordinary portland cement concrete.

[0088] As can be seen from the test data of Examples 1-10 and Comparative Examples 1-4, the high-iron phase cement, fluoroaluminate cement and ternary component admixture (fly ash, slag powder, expansive agent), three-level coarse aggregate and two-level fine aggregate have stronger adaptability and better synergistic effect; the concrete materials in the four comparative examples have lower strength, higher hydration heat release, higher adiabatic temperature rise, higher electric flux, larger chloride ion diffusion coefficient, smaller corrosion resistance coefficient, larger shrinkage value and poorer crack resistance.

[0089] The technical solutions disclosed and presented in the present application can be realized by the skilled in the art through reference to the content of the present application, appropriate change of conditions and routes, etc. Although the methods and preparation techniques of the present application have been described through preferred examples, the skilled in the art can obviously modify or recombine the methods and technical routes described in the present application without departing from the content, spirit and scope of the present application, to realize the final preparation techniques. It is particularly pointed out that all similar substitutions and modifications are obvious to the skilled in the art, and they are considered to be included in the spirit, scope and content of the present application.

Claims

1. A corrosion-resistant and crack-resistant concrete material for large-volume concrete engineering, characterized in that: The composition and mass fractions of the materials are as follows: 225-378 parts of high-ferric phase cement; 5-12 parts of fluoroaluminate cement; 158-215 parts of ternary component admixture; and 936-1077 parts of graded coarse aggregate. Secondary fine aggregate: 630-837 parts; The ternary component admixture comprises: 88-150 parts fly ash, 40-88 parts slag powder, and 20-30 parts expanding agent; the fly ash is selected as high-quality fly ash of grade II or above; the ternary component admixture is mixed and ground for 10-300 min at a mill speed of 10-500 rpm, and the specific surface area of ​​the ground admixture is between 400-800 m². 2 / kg; The specific surface area of ​​the slag powder is between 500 and 800 m². 2 / kg; The expanding agent consists of the following components in parts by weight: 80-88 parts of expanding component, 7-17 parts of hydration temperature rise inhibitor, and 3-5 parts of steel rust inhibitor, with a total of 100 parts by weight of the three components; The three-graded coarse aggregate includes: 123-160 parts of 5-10 mm stone, 795-867 parts of 10-20 mm stone, and 18-50 parts of 20-31.5 mm stone; the coarse aggregate material is a composite of one or more crushed stones or pebbles from granite, tuff, and limestone that are hard, clean, free of weathered particles, and have near-cubic particles. The secondary fine aggregate includes: 142-267 parts of medium sand and 488-570 parts of coarse sand; the secondary fine aggregate is made of one or two types of manufactured sand or river sand, with a particle size of medium sand and coarse sand. The high-ferrous phase cement contains C4AF at a mass fraction of 18% to 25% and C3A at a mass fraction of 0% to 2%. The fluoroaluminate cement contains C 11 The mass fraction of A7·CaF2 is between 71% and 79%, and the mass fraction of C2S is between 14% and 22%; the fluoroaluminate cement is used to replace the high-iron phase cement at a mass percentage of 2% to 8%.

2. The corrosion-resistant and crack-resistant concrete material for large-volume concrete engineering as described in claim 1, characterized in that: The prepared concrete material has an initial slump of 180-210 mm, a 56-day compressive strength exceeding 10%-15%, a 7-day heat of hydration of 170-210 kJ / kg, an adiabatic temperature rise of less than 50 °C, an electrical flux of 600-700 °C, and a chloride ion diffusion coefficient of less than 1.8 × 10⁻⁶. -12 m 2 / s, with a sulfate resistance rating higher than KS90 and a shrinkage value of less than 300 μm / m.

3. The corrosion-resistant and crack-resistant concrete material for large-volume concrete engineering as described in claim 1, characterized in that: The prepared concrete material is used in large-volume concrete structures with a strength of C45 to C80.

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