Novel bulk concrete admixture for ship lock

Abstract

The invention discloses a novel admixture for ship lock mass concrete, the ship lock mass concrete comprises the following raw materials: cement, aggregate, an admixture, fly ash, an additive and water for stirring, and the content of chloride ions in the concrete is not more than 0.06%; the entering temperature of the cement is not more than 60 DEG C, the aggregate adopts a spray cooling measure, the fly ash is I-grade ash, water for stirring is cooled by an industrial refrigerator, and the water temperature is lower than 10 DEG C; the admixture is prepared by taking zeolite powder as a basic raw material, carrying out surface modification treatment on the zeolite powder by an alkyl hydrophobic compound and then compounding at least two functional materials, the ship lock mass concrete is used in a ship lock with the effective length not smaller than 300 m, the effective width not smaller than 25 m and the threshold minimum water depth not smaller than 4.5 m, and part of a navigation channel of the ship lock is arranged in a straight-in curved-out mode. According to the formula, the water permeability of the concrete under hydrostatic pressure can be remarkably reduced, the cement hydration temperature rise peak value is reduced, and the crack resistance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete material selection in ship locks, and in particular to a new type of large-volume concrete admixture for ship locks. Background Art

[0002] In the construction of some projects, it is generally chosen to build a larger ship lock project. For example, when the scale of the lock body is selected to be 300m×25m×4.5m (effective length×effective width×minimum water depth of the threshold), the entire size is relatively large, and it is necessary to fully consider the strength design, etc. At the same time, in order to facilitate passage and transportation, a "straight in and curved out" layout will be adopted in some waterways of the ship lock, and then an outward expansion angle will be increased between the left or right auxiliary navigation wall and the axis of the lock chamber. As a result, problems such as complex lock structure, large concrete volume, many sudden structures, and high crack resistance requirements arise during construction. Currently available materials can no longer meet the above requirements. Summary of the Invention

[0003] The purpose of the present invention is to provide a new admixture for large-volume concrete of ship lock and its application to solve the above problems.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0005] In one aspect, a novel admixture for large-volume concrete of a ship lock comprises the following raw materials: cement, aggregate, admixture, fly ash, admixture and mixing water, wherein the chloride ion content in the concrete is not greater than 0.06%;

[0006] The on-site temperature of the cement is no more than 60°C, the aggregate is sprayed for cooling, the fly ash is Class I ash, and the mixing water is cooled by an industrial refrigerator at a temperature below 10°C. The admixture is made of zeolite powder as the basic raw material, which is surface-modified with an alkyl hydrophobic compound and then composited with at least two functional materials.

[0007] The large-volume concrete of the ship lock is used in a ship lock with an effective length of not less than 300m×effective width of not less than 25m×minimum water depth of the threshold of not less than 4.5m, and part of the navigation channel of the ship lock is arranged in a straight-in and curved-out form.

[0008] Furthermore, the mass fraction of the admixture is 4%-6% of the mass fraction of the gel material.

[0009] Furthermore, the cement and fly ash constitute a gel material, and the mass of the gel material accounts for 14%-19% of the total mass of the large-volume concrete of the ship lock.

[0010] Furthermore, the model of the admixture is polycarboxylic acid high-performance GTS-105 water reducer, and the water reducer is a retarding-setting water reducer.

[0011] Furthermore, the admixture is specifically a material prepared by using zeolite powder as a basic raw material, surface-modified with an alkyl hydrophobic compound, and then compounded with functional materials.

[0012] Furthermore, the invention also includes a method for preparing the admixture, which specifically includes dry grinding of zeolite powder and silicon micropowder, and mixing and stirring the dry ground zeolite powder and silicon micropowder with dry powder functional materials to obtain the admixture.

[0013] Furthermore, the adiabatic temperature rise rate ratio of the large-volume concrete of the ship lock is not greater than 90%.

[0014] Furthermore, the aggregate includes coarse aggregate and fine aggregate. The maximum particle size of the coarse aggregate is 45 mm, and three grades of 31.5-45 mm, 16-31.5 mm, and 5-16 mm are used to form a 5-40 mm continuous grading. The maximum particle size of the fine aggregate shall not be greater than 9.5 mm, and the fine aggregate uses medium sand in zone II 0-4.75 mm.

[0015] On the other hand, a new type of admixture for large-volume concrete of a ship lock is used in the ship lock, specifically to form a concrete protective layer of not less than 6 cm.

[0016] Furthermore, the application is at least applied to the lock body and the upstream navigation channel hydraulic structure.

[0017] The beneficial effects of the present invention are as follows:

[0018] In the present invention, the upper and lower gates are considered from the aspects of durability such as temperature control, crack resistance, and shrinkage compensation. It is recommended to use anti-cracking siliceous waterproofing agent (admixture) for concrete. The anti-cracking siliceous waterproofing agent (admixture) uses natural zeolite powder and the like as basic raw materials, which are surface-modified with alkyl hydrophobic compounds and then composited with a variety of functional materials. When added to concrete at 5% of the cementitious material, it can significantly reduce the permeability of the concrete under hydrostatic pressure, reduce the peak temperature rise of cement hydration, and improve crack resistance.

[0019] The present invention meets the relevant requirements by taking measures, including: the cement incoming temperature is not higher than 60°C, the coarse and fine aggregates are cooled by spraying, the fly ash is Class I ash, the admixture is a polycarboxylic acid high-performance GTS-105 water reducer (slow-setting type), the mixing water is cooled by an industrial refrigerator, and the water temperature is lower than 10°C.

[0020] In the present application, the admixture is made of zeolite powder as the basic raw material, which is selected to be surface modified by alkyl hydrophobic compound, and then is compounded with at least two functional materials. At this time, the admixture is made of natural zeolite powder as the carrier, which is surface modified and added with waterproof, anti-crack and crystalline components. The admixture can participate in and promote the cement hydration reaction to generate cementitious material and hydrophobic adsorption layer, fill capillary voids and fine cracks, prevent water and soluble pollutants from migrating, thereby reducing the adiabatic temperature rise rate of concrete and improving the crack resistance. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A comparison chart of compressive strength of the new admixture for ship lock mass concrete in the present application;

[0022] Figure 2 A comparison chart of concrete penetration height of the new admixture for ship lock mass concrete in the present application;

[0023] Figure 3 A comparison chart of penetration height of the new admixture for ship lock mass concrete in the present application. DETAILED DESCRIPTION

[0024] The present application will be described in detail below in conjunction with the embodiments, but it should be noted that these embodiments are not a limitation on the present application, and equivalent transformations or substitutions of functions, methods or structures made by those skilled in the art based on these embodiments are all within the protection scope of the present application.

[0025] The new admixture for ship lock mass concrete in the present application is used in a certain local security project, which is specifically introduced as follows:

[0026] The ship lock in the project is arranged as follows:

[0027] In this project, the newly constructed second-line ship lock is located east of the first-line ship lock (a reserved location in the planning), with the centerlines of the two lock chambers 84 meters apart. The upper gate of the second-line ship lock is shifted approximately 59 meters downstream from the upper gate of the first-line lock, staggered in position. The upstream and downstream navigation channels of the two locks are arranged separately. Both the upper and downstream navigation channels of the second-line ship lock adopt an asymmetrical "straight in, curved out" layout. The navigation channels connect to the main channel via a circular curve with a turning radius of 340 meters (280 meters on the upstream side of the Puyang River). The total length of the ship lock is 370 meters, including a 306-meter lock chamber and 32-meter lengths for the upper and lower gates. The upstream and downstream navigation channels are 502 meters and 518 meters long, respectively, with a base width of 58 meters. The Puyang River flood control dike on the upstream navigation channel was dismantled and rebuilt eastward. A new flood control dike was constructed between the first and second-line lock gates, totaling 670.7 meters in length. The Xinba River, east of the original Line 1 ship lock, was rerouted to run parallel to the east side of the Line 2 ship lock, connecting to the downstream end of the navigation section of the downstream pilot channel of the Line 2 ship lock. A drainage box culvert was installed at both the inlet and outlet, resulting in a total length of 379 meters. The rerouted lockhead bridge spans the upstream pilot channels of the Line 1 and Line 2 ship locks, and the original pedestrian steel bridge on the upstream side of the Line 1 lock was dismantled and rebuilt.

[0028] Design concept of a new admixture for large-volume concrete of ship lock in this project:

[0029] (1) Material selection

[0030] The present invention specifically includes the following raw materials: cement, aggregate, new admixtures, fly ash, admixtures, and mixing water. The concrete grade for this project's structures must be no less than C30, with a frost resistance rating no less than F50 and an anti-seepage rating no less than W4 for the upper lockhead. The concrete mix for the lock body and upstream approach channel hydraulic structures must meet a 100-year design service life. The chloride ion content in the concrete must not exceed 0.06%. Alkali-reactive aggregates are prohibited without verification. Furthermore, for durability reasons, the minimum protective layer thickness for the main concrete structures of this project must be no less than 6 cm.

[0031] In the present application, when the cement is screened, the selected cement strength grade of the cement should be adapted to the design strength grade of the concrete. The mass concrete is preferably selected from the group consisting of moderate heat Portland cement, low heat slag Portland cement and the like, and the concrete of the remaining part is preferably selected from the group consisting of moderate heat Portland cement and ordinary Portland cement with stable quality. The bulk cement should be stored for one week after leaving the factory before use, so as to increase the stability of the cement. In the present embodiment, the quality indexes such as the particle size, gradation, strength, fineness modulus and impurity content of the aggregate should meet the requirements of the specification, and the large-size gravel is preferably used under the condition of meeting the performance of the concrete, so as to effectively reduce the total amount of the cementitious material. The quality of the admixture such as fly ash and silica powder used in the concrete should meet the current national and industrial standards, and the dosage is determined according to the relevant specification and test. In the use of fly ash, the admixture of the mass structure concrete should be grade I fly ash, and the replacement or backfill part can use grade I or grade II fly ash. The concrete is mixed with appropriate amount of admixture (including water reducing agent, air entraining agent, retarder, accelerator and early strength agent), and the quality thereof should meet the requirements of the Technical Specification for Admixture for Hydraulic Concrete (DL / T5100-2014), and the admixture should be verified by production test before use. The anti-cracking silicon waterproof agent (admixture) is recommended to be used in the concrete of the upper and lower lock head of the ship lock to increase the structural durability. The water for mixing should meet the requirements of the Standard for Water Used in Concrete (JGJ63), and the swamp water, industrial waste water or water containing harmful impurities should not be used for mixing.

[0032] In the present project, the stainless steel or stainless steel composite steel is used for the metal structure of the ship lock, except for the structure with anti-corrosion requirement.

[0033] In view of the complex structure of the lock head, the large volume of the concrete and the many sudden changes of the structure, the anti-cracking silicon waterproof agent (admixture) is recommended to be used in the concrete of the upper and lower lock head of the ship lock from the aspects of temperature control, crack resistance and shrinkage compensation. The anti-cracking silicon waterproof agent (admixture) is made of natural zeolite powder and other basic raw materials, and is compounded by alkyl hydrophobic compound surface modification treatment and a plurality of functional materials. When the admixture is mixed into the concrete at 5% of the cementitious material, the water permeability of the concrete under the static water pressure can be significantly reduced, the peak value of the cement hydration temperature rise can be reduced, and the crack resistance can be improved.

[0034] In view of the complex structure of the lock head, the large volume of the concrete and the many sudden changes of the structure, the anti-cracking silicon waterproof agent (admixture) is recommended to be used in the concrete of the upper and lower lock head of the ship lock from the aspects of temperature control, crack resistance and shrinkage compensation. The anti-cracking silicon waterproof agent (admixture) is made of natural zeolite powder and other basic raw materials, and is compounded by alkyl hydrophobic compound surface modification treatment and a plurality of functional materials. When the admixture is mixed into the concrete at 5% of the cementitious material, the water permeability of the concrete under the static water pressure can be significantly reduced, the peak value of the cement hydration temperature rise can be reduced, and the crack resistance can be improved.

[0035] (2) Anti-corrosion measures

[0036] The detailed anti-corrosion requirements for metal structural members such as gates and valves are proposed (see related chapters), and the remaining structures are made of stainless steel or stainless steel composite steel. In the construction of large-volume concrete such as the gate head, gate chamber, and navigation wall, effective measures are required to control temperature cracks. Specific requirements are proposed from the aspects of concrete materials, mix proportion, admixture, construction technology, and auxiliary measures. See the relevant requirements for construction.

[0037] (4) Concrete mix proportion

[0038] The durability requirements for hydraulic structure concrete mix proportion are implemented in accordance with the relevant provisions of "Water Transport Engineering Structure Durability Design Standard" (JTS153-1-2015) and "Water Conservancy and Hydropower Engineering Reasonable Service Life and Durability Design Specification" (SL 654-2014)

[0039] The specific preparation process of the large-volume concrete in the ship lock in this embodiment is as follows:

[0040] First, the raw materials are weighed according to the raw material ratio:

[0041] The specific raw materials are cement, coarse and fine aggregates, admixture, fly ash, admixture, and water for mixing. The content of chloride ions in the concrete is not more than 0.06%. According to the concrete mix proportion, the bulk density of ordinary concrete in this embodiment is approximately 2400 kg / m 3 , and the mass ratio is approximately cement: fly ash: water: sand: gravel: water reducing agent = 1:0.66:0.80:3.82:5.50:0.01.

[0042] The mixing equipment first adds yellow sand, then adds gravel, then adds cement and fly ash, and then adds a mixture of water and admixture, and then adds a mixture of water and admixture,

[0043] In this project, the incoming temperature of the cement is not more than 60℃, the aggregate is cooled by spraying, the fly ash is grade I ash, and the water for mixing is cooled by an industrial refrigerator, with a water temperature of less than 10℃. At this time, by controlling the temperature of the cement, the aggregate is cooled, and the use of cooling water for mixing can effectively reduce the concrete temperature, delay the occurrence time of the concrete temperature peak, and effectively reduce the concrete temperature rise rate.

[0044] In this embodiment, the admixture is made of zeolite powder as the basic raw material, which is surface modified by an alkyl hydrophobic compound, and then compounded with at least two functional materials. At this time, the admixture uses natural zeolite powder as the carrier, which is surface modified and added with waterproof, anti-cracking, and crystalline components. It can participate in and promote the cement hydration reaction, generate cementitious substances and hydrophobic adsorption layers, fill capillary voids and fine cracks, prevent water and soluble pollutants from migrating, thereby reducing the concrete adiabatic temperature rise rate and improving the crack resistance.

[0045] The large-volume concrete of the ship lock in this embodiment is used in a ship lock with an effective length of not less than 300m × an effective width of not less than 25m × a minimum water depth at the threshold of not less than 4.5m, and part of the waterway of the ship lock is arranged in a straight entry and curved exit form, thereby meeting the requirements of this project.

[0046] In this embodiment, the upper and lower gates are recommended to use anti-cracking siliceous waterproofing agent (admixture) for concrete from the aspects of durability such as temperature control, crack resistance, and shrinkage compensation. The anti-cracking siliceous waterproofing agent (admixture) specifically uses natural zeolite powder and the like as basic raw materials, which are surface-modified with alkyl hydrophobic compounds and then composited with a variety of functional materials. When added to concrete at 5% of the cementitious material, it can significantly reduce the permeability of the concrete under hydrostatic pressure, reduce the peak temperature rise of cement hydration, and improve crack resistance.

[0047] In this embodiment, the cement and fly ash constitute a gel material, and the mass of the gel material accounts for 14%-19% of the total mass of the large-volume concrete of the ship lock.

[0048] In this embodiment, the mass of the admixture is 4%-6% of the mass of the gel material, preferably 5%. In this embodiment, an admixture less than 4% is difficult to achieve the desired crack resistance and waterproofing effect, while an admixture greater than 6% is too expensive and uneconomical. In this embodiment, the admixture functions to reduce the water permeability of the concrete under hydrostatic pressure, lower the peak temperature rise of cement hydration, and reduce the adiabatic temperature rise rate ratio of the concrete.

[0049] In this embodiment, the model of the admixture is polycarboxylic acid high-performance GTS-105 water reducer, and the water reducer is a retarding-setting water reducer.

[0050] In this embodiment, the admixture is specifically a material prepared by using zeolite powder as a basic raw material, surface-modified with an alkyl hydrophobic compound, and then compounded with functional materials.

[0051] Specifically, the invention also includes a method for preparing the admixture, which specifically includes dry grinding of zeolite powder and silica powder, and mixing the dry ground zeolite powder and silica powder with dry powder functional materials to obtain the admixture. In the specific preparation, cement can also be added, and then the zeolite powder, silica powder, cement, etc. can be dried and ground to a fineness that meets the standard (usually a specific surface area of ​​≥400m 2 / kg); then mix, at this time according to the formula, zeolite powder, silica powder, water reducer, activator, fiber and other dry powder materials are evenly stirred in the mixer (20-30 minutes). Finally, the packaging step can be added, and the packaging should be sealed and moisture-proof to prevent lumps.

[0052] Specifically, the functional materials include zeolite powder, silica powder, water reducer, stimulant, fiber and other dry powder materials.

[0053] In this embodiment, the adiabatic temperature rise rate ratio of the large-volume concrete of the ship lock is not more than 90%. In this embodiment, the adiabatic temperature rise rate ratio of the large-volume concrete of the ship lock is not more than 90% because the admixture uses natural zeolite powder as a carrier, is surface-modified, and is compounded with waterproof, crack-resistant, and crystalline components. It can participate in and promote cement hydration reaction, generate gelling material and hydrophobic adsorption layer, fill capillary voids and fine cracks, prevent the migration of moisture and soluble pollutants, and thus reduce the adiabatic temperature rise rate ratio of concrete.

[0054] In the prior art, the thermal temperature rise rate ratio refers to the ratio of the rate of material temperature rise per unit time in an adiabatic environment (no heat loss) to a reference rate (or rate under different conditions). According to the definition of the adiabatic temperature rise rate ratio, the ratio is specifically the ratio of the temperature rise rates of concrete incorporating the new material to the reference concrete. If the two are very close, the closer they are to 1, the less effective the material is, indicating that it has failed to improve the concrete's crack resistance. Therefore, in this embodiment, the ratio is limited during use.

[0055] In this embodiment, in the large-volume concrete of the ship lock, the grade of the prepared admixture is not lower than C30, the frost resistance grade is not lower than F50, and the anti-seepage grade of the upper lock head is not lower than W4.

[0056] In this embodiment, the cement is generally medium-heat Portland cement or low-heat slag Portland cement, or bulk concrete stored for at least one week, and the admixtures are generally water reducers, air entraining agents, retarder, quick-setting agent, and early strength agent.

[0057] The aggregate in this embodiment includes coarse aggregate and fine aggregate. The maximum particle size of the coarse aggregate is 45 mm, and three grades of 31.5-45 mm, 16-31.5 mm, and 5-16 mm are used to form a 5-40 mm continuous grading. The maximum particle size of the fine aggregate shall not be greater than 9.5 mm, and the fine aggregate adopts 0-4.75 mm medium sand in zone II.

[0058] When the large volume concrete is applied in this embodiment, a concrete protective layer of not less than 6 cm is formed on the ship lock. This concrete protective layer is generally provided on the ship lock body and the upstream pilot channel hydraulic structure.

[0059] For the large-volume concrete of the ship lock in this embodiment, the specific experimental cases of its performance parameters are as follows:

[0060] In this test, the product was added to concrete of different grades at 5% of the cementitious material dosage, and five groups of tests were conducted on concrete with strength grades of C30 to C50. The specific conclusions are shown in Table 1:

[0061] Table 1 Concrete test mix ratio

[0062]

[0063] From the conclusion in Table 1, it can be seen that, in different types of concrete, after adding 5% of the new admixture of gel material, the application requirements of the present embodiment are met.

[0064] The experiment on the influence of the new admixture product on the slump of concrete is carried out, and Table 2 is obtained.

[0065] Table 2: Slump of concrete and 1h slump loss

[0066] serial number G001 G002 G003 G004 G005 G006 G007 G008 G009 G010 Slump mm 210 205 210 200 215 210 215 205 210 210 1h slump loss mm 25 30 35 30 20 25 35 30 35 35

[0067] From the influence of the new admixture on the slump of concrete and 1h slump loss in Table 2, it can be seen that the new admixture has little effect on the slump of concrete, and the 1h slump loss does not change with the addition of the new admixture.

[0068] Through the detection of the influence on the strength of concrete, Table 3 is obtained

[0069] Table 3: 7d and 28d compressive strength of concrete

[0070] serial number G001 G002 G003 G004 G005 G006 G007 G008 G009 G010 7d compressive strength MPa 27.0 27.6 31.4 31.6 36.2 36.7 38.5 37.9 42.1 42.8 28d compressive strength MPa 35.8 38.3 42.4 45.5 47.3 50.9 52.0 57.5 58.3 62.1

[0071] At the same time, different strength concretes such as C30 concrete, C35 concrete, C40 concrete, C45 concrete and C50 concrete are selected for strength test. It can be seen from the change of the curve and the test results that the 7-day compressive strength of the concrete mixed with the admixture and the concrete without admixture does not change significantly and is basically consistent. The 28-day compressive strength of the concrete mixed with the new admixture is significantly improved. At the same time, it can be seen from the experimental data that the strength of the concrete mixed with the new admixture increases slightly, and the 28d strength growth rate is larger than the 7d strength growth rate.

[0072] Through the experiment on the influence of the product on the impermeability of concrete, Table 4 is obtained.

[0073] Table 4: Permeation height of concrete and permeation height ratio

[0074] serial number G001 G002 G003 G004 G005 G006 G007 G008 G009 G010 Penetration height cm 11.5 4.1 9.8 3.3 7.3 2.4 6.2 2.1 4.5 1.4 Penetration height ratio% 100 35.7 100 33.7 100 32.9 100 32.0 100 31.1

[0075] Through the line feedback of the data in Table 4, it is obtained Figure 2 , that is, the influence change diagram of the permeability of concrete. It can be seen from the experimental data that the addition of the new admixture can greatly reduce the permeation height of the concrete, and the permeation height ratio is less than 40%. The higher the concrete grade, the smaller the reduction rate, because the increase of the concrete grade represents the decrease of the water-cement ratio and the increase of the amount of cementitious materials, and the concrete is more dense, so the reduction rate is smaller.

[0076] Table 5 is obtained by the effect on the crack resistance of concrete (flat plate crack resistance test).

[0077] Table 5 Concrete crack area and crack area reduction rate

[0078] serial number G001 G002 G003 G004 G005 G006 G007 G008 G009 G010 <![CDATA[裂缝面积mm 2 ]]> 86.3 67.7 123.9 94.7 173 133.3 213.5 168.3 269.3 214.2 Crack area reduction rate % 100 21.6 100 23.6 100 22.9 100 21.2 100 20.5

[0079] The flat plate anti-cracking test in Table 5 shows that the siliceous waterproofing agent has a certain inhibitory effect on the formation of cracks. The effect is different under different grades of concrete. The addition of anti-cracking siliceous waterproofing agent can reduce a certain crack area. However, considering that the cracks measured by the above method are early shrinkage cracks within 24 hours, the expansion effect time of the expansion components in the product is not obvious until after 24 hours. Therefore, the flat plate anti-cracking test cannot fully reflect the anti-cracking function of the product.

[0080] For the concrete in this example, an anti-chloride ion penetration test was conducted using the electric flux method, and the results shown in Table 6 were obtained.

[0081] Table 6 Concrete electric flux test data

[0082] serial number G001 G002 G003 G004 G005 G006 G007 G008 G009 G010 Electric flux (Coulomb) 1304 1164 1098 932 984 872 796 703 721 654

[0083] Comparing the data in Table 6, we can get Figure 3 As can be seen from the chart, the higher the concrete strength, the smaller the electric flux of the concrete. Under the same grade, the electric flux of concrete with new admixtures is smaller than that of concrete without admixtures. Therefore, the addition of this product can effectively improve the durability of concrete such as resistance to chloride ion corrosion.

[0084] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0086] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A new admixture for large-volume concrete of ship lock, characterized by: The concrete comprises the following raw materials: cement, aggregate, admixture, fly ash, admixture and mixing water, wherein the chloride ion content in the concrete is not greater than 0.06%; The on-site temperature of the cement is no more than 60°C, the aggregate is sprayed for cooling, the fly ash is Class I ash, and the mixing water is cooled by an industrial refrigerator at a temperature below 10°C. The admixture is made of zeolite powder as the basic raw material, which is surface-modified with an alkyl hydrophobic compound and then composited with at least two functional materials. The large-volume concrete of the ship lock is used in a ship lock with an effective length of not less than 300m×effective width of not less than 25m×minimum water depth of the threshold of not less than 4.5m, and part of the navigation channel of the ship lock is arranged in a straight-in and curved-out form.

2. The new admixture for ship lock mass concrete according to claim 1, characterized in that: The cement and fly ash constitute a gel material, and the mass of the gel material accounts for 14%-19% of the total mass of the large-volume concrete of the ship lock.

3. The new admixture for ship lock mass concrete according to claim 2, characterized in that: The mass of the admixture is 4%-6% of the mass of the gel material.

4. The new admixture for ship lock mass concrete according to claim 1, characterized in that: The model of the admixture is polycarboxylic acid high-performance GTS-105 water reducer, and the water reducer is a retarding-setting water reducer.

5. The new admixture for ship lock mass concrete according to claim 1, characterized in that: The admixture is specifically a material made of zeolite powder as a basic raw material, which is surface-modified with an alkyl hydrophobic compound and then compounded with functional materials.

6. The new admixture for ship lock mass concrete according to claim 5, characterized in that: The invention also includes a preparation method of the admixture, which specifically includes dry grinding of zeolite powder and silicon micropowder, and mixing and stirring the dry ground zeolite powder and silicon micropowder with dry powder functional materials to obtain the admixture.

7. The new admixture for ship lock mass concrete according to claim 1, characterized in that: The adiabatic temperature rise rate ratio of the large-volume concrete of the ship lock is not greater than 90%.

8. The new admixture for ship lock mass concrete according to claim 1, characterized in that: The aggregate includes coarse aggregate and fine aggregate. The maximum particle size of the coarse aggregate is 45mm, and it adopts three grades of 31.5-45mm, 16-31.5mm, and 5-16mm to form a 5-40mm continuous grading. The maximum particle size of the fine aggregate shall not be greater than 9.5mm, and the fine aggregate adopts medium sand in zone II 0-4.75mm.

9. Use of the new admixture for large-volume concrete of a ship lock according to any one of claims 1 to 8 in a ship lock, specifically for forming a concrete protective layer of not less than 6 cm.

10. The use according to claim 9, characterized in that The application is at least an application on a ship lock body and an upstream navigation channel hydraulic structure.

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