CN112897951B - Concrete with volume weight of more than 5000kg per cubic meter and preparation method thereof - Google Patents
Concrete with volume weight of more than 5000kg per cubic meter and preparation method thereof Download PDFInfo
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- CN112897951B CN112897951B CN202110153369.6A CN202110153369A CN112897951B CN 112897951 B CN112897951 B CN 112897951B CN 202110153369 A CN202110153369 A CN 202110153369A CN 112897951 B CN112897951 B CN 112897951B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The application discloses concrete with the volume weight of more than 5000 kilograms per cubic meter and a preparation method thereof, and relates to the technical field of concrete materials. The concrete with the volume weight of more than 5000kg per cubic meter is mainly prepared from the following concrete raw materials in parts by weight: 180 parts of 170-180 parts of water, 4200-4400 parts of iron sand, 6.8-13.6 parts of an admixture, 3-6 parts of ferrocene, 3.5-5 parts of hydroxyl-terminated polybutadiene and 750 parts of cement; the additive is mainly prepared from the following raw materials in percentage by weight: 5.5-6.5% of hydrogen peroxide, 14-16% of sodium gluconate, 12.5-15.5% of core material, 9-11% of calcium gluconate, 4.5-5.5% of vitamin C and the balance of isopentenyl polyoxyethylene ether. The construction method has the advantages of good construction performance, no bleeding phenomenon and capability of being used for pumping construction. The preparation method has the advantage of improving the workability of the product.
Description
Technical Field
The application relates to the technical field of concrete materials, in particular to concrete with the volume weight of more than 5000 kilograms per cubic meter and a preparation method thereof.
Background
The heavy concrete is concrete with larger volume weight, and the volume weight is generally more than 2800kg/m3. The heavy concrete is usually prepared by mixing dense heavy aggregate with cementing materials such as strontium cement, barium cement and the like. The heavy concrete has the performance of being impermeable to X rays and gamma rays and has excellent radiation protection performance. Heavy concrete has been gradually applied to the fields of box girder counterweights, overhead bridges, nuclear power engineering, hospitals, military bases, building floor parts, dam underwater back cover engineering, nuclear industry, tunnels and the like.
The prior common heavy concrete adopts barite, iron ore, steel scraps and other raw materials as aggregate, obviously improves the volume weight of the concrete and improves the strength of the concrete, and the volume weight of the common heavy concrete is 2800 and 4000kg/m3At present, the volume weight exceeds 5000kg/m3The research on the heavy concrete is very little.
Aiming at the related technology, the raw materials such as barite, iron ore, steel scraps and the like are used as the aggregate, the density of the aggregate is high, and particularly, the volume weight exceeds 5000kg/m3In the process, the requirement on the density of the aggregate is higher, certain adverse effect is brought to the stability of the concrete, the cohesiveness and the water retention of the concrete are influenced, and certain adverse effect is brought to the construction performance of the heavy concrete.
Disclosure of Invention
In order to improve the construction performance of heavy concrete, the application provides concrete with the volume weight of more than 5000 kilograms per cubic meter and a preparation method thereof.
In a first aspect, the present application provides a concrete having a bulk density of more than 5000kg per cubic meter, using the following technical scheme:
the concrete with the volume weight of more than 5000kg per cubic meter is mainly prepared from the following concrete raw materials in parts by weight: 180 parts of 170-180 parts of water, 4200-4400 parts of iron sand, 6.8-13.6 parts of an admixture, 3-6 parts of ferrocene, 3.5-5 parts of hydroxyl-terminated polybutadiene and 750 parts of cement;
the apparent density of the iron sand is more than 6800kg/m3(ii) a The additive is mainly prepared from the following raw materials in percentage by weight: 5.5-6.5% of hydrogen peroxide, 14-16% of sodium gluconate, 12.5-15.5% of core material, 9-11% of calcium gluconate, 4.5-5.5% of vitamin C and the balance of isopentenyl polyoxyethylene ether; the core material is a composition consisting of nonylphenol polyoxyethylene ether or nonylphenol polyoxyethylene ether, allyl polyoxyethylene ether and methyl allyl polyoxyethylene ether.
By adopting the technical scheme, the iron sand with high apparent density is used for replacing common sand stone as aggregate to prepare the concrete, the volume weight of the concrete is obviously improved, and the prepared concrete has the volume weight of more than 5000kg/m3The heavy concrete of (2). The core material containing nonylphenol polyoxyethylene ether and isopentenyl polyoxyethylene ether are used for preparing an additive; the isopentenyl polyoxyethylene ether has a larger steric hindrance effect, can ensure that the dispersion of cement particles is more stable, and has stronger cement particle dispersion capability; the polyoxyethylene nonyl phenyl ether has excellent permeation and emulsification effects besides the dispersing effect on cement particles, the isopentenyl polyoxyethylene ether and the polyoxyethylene nonyl phenyl ether have a certain compounding effect when used together, cement groups are enabled to have the same charges when used, cement is conveniently and uniformly dispersed in heavy concrete, the water consumption is reduced, the consistency of the heavy concrete is increased, the heavy concrete has proper slump, the slump loss is prevented, the stability of the heavy concrete is improved, the flowability and the workability of a product are improved, and the constructability of the product is improved. Ferrocene is added into raw materials for preparing heavy concrete, the ferrocene contains cyclopentadiene groups and iron ions, the main component in the admixture is isopentenyl polyoxyethylene ether containing isopentenyl groups, the ferrocene and the isopentenyl polyoxyethylene ether have good compatibility, the iron ions in the ferrocene and iron sand have good compatibility, and the ferrocene and the isopentenyl polyoxyethylene ether have combined actionAnd the cement is promoted to be transferred to the surface of the iron sand more quickly, heavy concrete components such as cement and additives are promoted to be uniformly dispersed in the iron sand, the stability of the concrete is promoted to be improved, the phenomena of segregation and bleeding of the concrete are promoted to be prevented, and the construction performance of the concrete is improved. The hydroxyl-terminated polybutadiene is added, so that the improvement of the surface viscosity of iron sand and ferrocene is facilitated, the improvement of the bonding strength among components of a concrete product is facilitated, the improvement of the compressive strength of the concrete product is facilitated, the hydroxyl-terminated polybutadiene and nonylphenol polyoxyethylene ether in the admixture both contain hydroxyl groups, and after the hydration of cement is completed, the hydroxyl-terminated polybutadiene forms a net structure in the concrete, so that the improvement of the crack resistance and the compressive performance of the concrete is facilitated. The hydrogen peroxide has an oxidation initiation effect, the vitamin C has a reduction effect, and the hydrogen peroxide and the vitamin C have a synergistic effect, so that the reaction activity of the admixture is favorably controlled, the cement is favorably fully hydrated, hollowing is favorably prevented, and the mechanical strength of the heavy concrete is favorably improved. The sodium gluconate has a retarding effect, the calcium gluconate has a surface activity effect, and the sodium gluconate, the calcium gluconate and the nonylphenol polyoxyethylene ether are beneficial to improving the compatibility among the components of the concrete and improving the construction performance of the product.
Preferably, the core material is polyoxyethylene nonylphenol ether, polyoxyethylene allyl ether or polyoxyethylene methallyl ether (3.5-4.5): (4.5-5.5): (4.5-5.5) in weight ratio.
By adopting the technical scheme, the core material consisting of the nonylphenol polyoxyethylene ether, the allyl polyoxyethylene ether and the methallyl polyoxyethylene ether, the allyl polyoxyethylene ether, the methallyl polyoxyethylene ether, the nonylphenol polyoxyethylene ether and the isopentenyl polyoxyethylene ether are used, the steric hindrance effects of the substances have certain difference, the dispersion effect of cement particles also has certain difference, the substances are used in a compounding way and have a synergistic effect, the compatibility between cement and iron sand is improved, the cement is uniformly dispersed among the iron sand, and the compressive strength of concrete is improved.
Preferably, the concrete raw material also comprises 90-110Fly ash with apparent density not less than 2800kg/m3。
By adopting the technical scheme, a certain amount of fly ash is added to partially replace cement, which is beneficial to improving the working performance of concrete and reducing the cost. The cement with large apparent density is used, so that the volume weight of the concrete is improved, the requirement of the volume weight design of the concrete is better met, and the radiation protection performance of the product is improved.
Preferably, the concrete raw material also comprises silica fume with the apparent density not less than 2900kg/m and not more than 150 parts by weight3。
By adopting the technical scheme, the silica fume is added, and the silica fume can be filled in the pores among the cement particles to generate gel with hydration products, so that the workability is improved, the bleeding phenomenon of the concrete is prevented, and the working performance of the concrete is improved.
Preferably, the concrete raw material also comprises 0.8 to 1.2 weight parts of boric acid, and the apparent density of the boric acid is not less than 1430kg/m3。
By adopting the technical scheme, the boric acid is a high-efficiency thermal neutron absorbent, the heavy concrete has the function of preventing x-ray and gamma-ray radiation, the performance of preventing neutron radiation can be effectively improved by adding the boric acid, and the radiation-proof performance of the product is further improved.
Preferably, the concrete raw material also comprises 2-3.5 parts by weight of 3-methoxy catechol.
By adopting the technical scheme, 3-methoxy catechol is added into heavy concrete, the molecules of the 3-methoxy catechol contain a plurality of phenolic hydroxyl groups, and the phenolic hydroxyl groups can be complexed with iron ions on the surface of iron sand and adsorbed on the surface of the iron sand to form a net structure, thereby being beneficial to improving the mechanical strength of concrete products; the interaction between the methoxy group on the 3-methoxy catechol and the polyoxyethylene ether group contained in the admixture, and the synergistic effect of the 3-methoxy catechol and the admixture are beneficial to improving the compatibility between the iron sand and the admixture, improving the compressive strength of the heavy concrete product, prolonging the service life of the product and facilitating the market popularization of the product.
Preferably, the concrete with volume weight more than 5000kg per cubic meter is mainly prepared from the following concrete raw materials in parts by weight: 175 parts of water, 4200-4400 parts of iron sand, 6.8-13.6 parts of an additive, 700 parts of cement, 3-6 parts of ferrocene and 3.5-5 parts of hydroxyl-terminated polybutadiene. Preferably, the additive is prepared from the following raw materials in percentage by weight: 6% of hydrogen peroxide, 15% of sodium gluconate, 14% of core material, 10% of calcium gluconate, 5% of vitamin C and 50% of isopentenyl polyoxyethylene ether.
By adopting the technical scheme, the better raw material feeding proportion is used, the flowability of heavy concrete is favorably controlled, the bleeding performance is improved, and the construction performance of a concrete product is improved. The use of the better composition proportion of the admixture is beneficial to better dispersing cement in concrete and better improving the construction performance and mechanical performance of concrete products.
In a second aspect, the present application provides a method for preparing concrete with a volume weight of more than 5000kg per cubic meter, which adopts the following technical scheme:
a method for preparing concrete with volume weight more than 5000 kilograms per cubic meter comprises the following steps: weighing concrete raw materials, stirring for 120-180s to prepare the concrete with the volume weight of more than 5000kg per cubic meter.
By adopting the technical scheme, the method disclosed by the application is used for preparing the heavy concrete, the weight of the prepared heavy concrete exceeds 5000 kilograms per cubic meter, and the concrete has excellent workability and constructability while the volume weight of the concrete is obviously improved, so that the mechanical strength of a product is improved.
Preferably, the preparation method of the admixture comprises the following steps: weighing isopentenyl polyoxyethylene ether, stirring, heating to 85-95 ℃, adding a core material, dropwise adding hydrogen peroxide at a constant speed for 30-90min, and stirring for 150min while keeping the temperature for 100-; cooling to no more than 60 deg.C, adding vitamin C, sodium gluconate and calcium gluconate, and stirring for no less than 20min to obtain the additive.
By adopting the technical scheme, the admixture prepared by the method disclosed by the application has high water reducing rate and high density, and is suitable for preparing heavy concrete with large volume weight.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the core material containing nonylphenol polyoxyethylene ether and isopentenyl polyoxyethylene ether are used for preparing an additive; the isopentenyl polyoxyethylene ether has a larger steric hindrance effect, can ensure that the dispersion of cement particles is more stable, and has stronger cement particle dispersion capability; the nonyl phenol polyoxyethylene ether has excellent permeation and emulsification effects besides the dispersing effect on cement particles, and the isopentenyl polyoxyethylene ether and the nonyl phenol polyoxyethylene ether have a certain compounding effect when used together, so that cement groups have the same charge when used, cement is conveniently and uniformly dispersed in heavy concrete, the water consumption is reduced, the consistency of the heavy concrete is increased, the heavy concrete has proper slump, the slump loss is prevented, the stability of the heavy concrete is improved, the flowability and the workability of a product are improved, and the constructability of the product is improved; according to the application, ferrocene is added into raw materials for preparing heavy concrete, the ferrocene contains cyclopentadiene groups and iron ions, the main component of the admixture is isopentenyl polyoxyethylene ether containing isopentenyl groups, the ferrocene and the isopentenyl polyoxyethylene ether have good compatibility, the iron ions in the ferrocene and iron sand have good compatibility, under the combined action of the ferrocene and the isopentenyl polyoxyethylene ether, the cement can be more quickly migrated to the surface of the iron sand, heavy concrete components such as the cement and the admixture can be uniformly dispersed in the iron sand, the concrete stability can be improved, and the concrete construction performance can be improved; the hydroxyl-terminated polybutadiene is added, so that the improvement of the surface viscosity of iron sand and ferrocene is facilitated, the improvement of the bonding strength among components of a concrete product is facilitated, and the improvement of the compressive strength of the concrete product is facilitated;
2. according to the application, the silica fume is added, and can be filled into the pores among cement particles to generate gel with hydration products, so that the workability of the product is improved, the bleeding phenomenon of concrete is prevented, the collapse-preventing performance of the product is improved, and the working performance of the product is improved;
3. according to the method, 3-methoxy catechol is added into heavy concrete, the molecules of the 3-methoxy catechol contain a plurality of phenolic hydroxyl groups, and the phenolic hydroxyl groups can be complexed with iron ions on the surface of iron sand and adsorbed on the surface of the iron sand to form a net structure, so that the mechanical strength of a concrete product is improved; and the interaction of the methoxy group on the 3-methoxy catechol and the polyoxyethylene ether group contained in the admixture is beneficial to improving the compatibility between the iron sand and the admixture, improving the compressive strength of the heavy concrete product, prolonging the service life of the product and facilitating the market popularization of the product.
Detailed Description
The inventor finds in the research process that in the process of preparing heavy concrete, especially when the volume weight exceeds 5000kg/m3In the process, the concrete product prepared by using the existing water reducing agent in the market has poor cohesiveness, poor water retention, serious bleeding and segregation phenomena, quick slump loss, difficult slump control in the pouring process and poor construction performance; after pouring and forming, water is separated out from the surface of the concrete, and the compressive strength is poor. The self-made admixture is used, the ferrocene and the hydroxyl-terminated polybutadiene are added, the cement is uniformly dispersed between the iron sand, the compatibility among all components of the heavy concrete is improved, the bleeding phenomenon is prevented, the constructability of the heavy concrete product is improved, and the compressive strength of the concrete product is improved. This application keeps good constructability when improving heavy concrete unit weight, helps product market to promote. Because the barite is too discrete and is not densely filled, the volume weight of the concrete can not meet the requirement, and the barite is not used as an aggregate in the application. Ferrocene is added in the concrete, and the ferrocene interacts with iron sand, so that the impact resistance of the heavy concrete is improved. 3-methoxy catechol is added, and the 3-methoxy catechol contains three adjacent phenolic hydroxyl groups, performs complex reaction with free iron ions on the surface of iron sand, and interacts with ferroceneThe method helps to prevent components such as water molecules and chloride ions from contacting the surface of the iron sand, and helps to improve the corrosion resistance of the heavy concrete. The application has the advantages of good construction performance, good workability, no bleeding phenomenon and capability of being used for pumping construction.
Examples
The raw materials referred to in the present application are all commercially available, and the type and source of the raw materials are shown in table 1.
TABLE 1 Specification, type and origin of the raw materials
The iron sand used in the following examples was provided by environmental protection science and technology ltd, Tenze, Henan, and had two specifications, one of which was 6820kg/m in apparent density3Fineness 3.3; the other is 7550kg/m3And the fineness is 3.1.
Preparation example
Preparation example 1: the preparation method of the admixture comprises the following steps:
weighing 2.5kg of isopentenyl polyoxyethylene ether, stirring at the rotating speed of 100 revolutions per minute, heating to 90 ℃, adding 700g of nonylphenol polyoxyethylene ether, dropwise adding 300g of hydrogen peroxide at a constant speed for 60min, and stirring for 120min while keeping the temperature; cooling to 55 deg.C, adding 250g vitamin C, 750g sodium gluconate and 500g calcium gluconate, and stirring for no less than 20min to obtain the additive.
Preparation example 2: the preparation method of the admixture comprises the following steps:
weighing 2.5kg of isopentenyl polyoxyethylene ether, stirring at the rotating speed of 100 revolutions per minute, heating to 90 ℃, adding 250g of allyl polyoxyethylene ether, 200g of nonylphenol polyoxyethylene ether and 250g of methyl allyl polyoxyethylene ether, dropwise adding 300g of hydrogen peroxide at a constant speed for 60min, and stirring for 120min while keeping the temperature; cooling to 55 deg.C, adding 250g vitamin C, 750g sodium gluconate and 500g calcium gluconate, and stirring for no less than 20min to obtain the additive. With reference to GB/T8077-2012 'test method for homogeneity of concrete admixture', the water reduction rate is detected, and the water reduction rate of the admixture prepared in the preparation example 2 is 35%.
Preparation examples 3 to 6
The differences between the preparation examples 3 to 6 and the preparation example 2 are that the addition amounts of the raw materials of the preparation examples 3 to 6 are different and the process parameters are different, the addition amounts of the raw materials of the preparation examples 3 to 6 are shown in Table 2, and the parameters in the steps of the preparation examples 3 to 6 are shown in Table 3.
TABLE 2 addition amounts of respective raw materials of preparation examples 3 to 6
TABLE 3 parameters in the Steps of preparation examples 3 to 6
Examples
Example 1: the preparation method of the concrete with the volume weight of more than 5000 kilograms per cubic meter comprises the following steps: 62.86kg of iron sand (the apparent density is 6820 kg/m)3) And 10kg of cement, were added to a mixer for a concrete double horizontal shaft experiment (Kyoho-Moh & ltd & gt, model HC-HJS60), stirred at a rotation speed of 55 rpm, and 180g of the admixture (the admixture prepared in preparation example 1), 64g of ferrocene, 60g of hydroxyl-terminated polybutadiene, and 2.5kg of water were sequentially added thereto, and the mixture was further stirred for 120 seconds, to prepare concrete having a bulk density of more than 5000kg per cubic meter. The product has good fluidity.
Examples 2 to 6
Examples 2 to 6 are different from example 1 in that examples 2 to 6 use different batches of the admixture and the admixture is identical to example 1, and examples 2 to 6 use the admixtures obtained in preparation examples 2, 3, 4, 5 and 6, respectively, in this order.
Example 7
Example 7: coagulation with a volume weight of more than 5000kg per cubic meterThe preparation method of the soil comprises the following steps: 60Kg of iron sand (the apparent density is 7550 Kg/m)3) 10kg of cement and 1.43kg of fly ash are added into a mixer for a concrete double horizontal shaft experiment, the mixture is stirred at the rotating speed of 55 revolutions per minute, 104g of additive (the additive prepared in preparation example 2), 64g of ferrocene, 60g of hydroxyl-terminated polybutadiene and 2.5kg of water are sequentially added, and the mixture is continuously stirred for 180 seconds to prepare the concrete with the volume weight of more than 5000kg per cubic meter. The product has good fluidity.
Example 8
Example 8: the preparation method of the concrete with the volume weight of more than 5000 kilograms per cubic meter comprises the following steps: 60Kg of iron sand (the apparent density is 7550 Kg/m)3) 10kg of cement and 1.43kg of silica fume are added into a mixer for a concrete double horizontal shaft experiment, the mixture is stirred at the rotating speed of 55 revolutions per minute, 104g of additive (the additive prepared in preparation example 2), 64g of ferrocene, 60g of hydroxyl-terminated polybutadiene and 2.5kg of water are sequentially added, and the mixture is continuously stirred for 150 seconds to prepare the concrete with the volume weight of more than 5000kg per cubic meter. The product has good fluidity.
Example 9
Example 9 differs from example 8 in that 14g of boric acid was added to the concrete batch of example 9, all otherwise in accordance with example 8.
Example 10
Example 10 differs from example 9 in that 42.8g of 3-methoxycatechol were added to the concrete batch of example 10, all the other things remaining in accordance with example 9.
Examples 11 to 16
Examples 11 to 16 are different from example 10 in that the amounts of the respective raw materials of examples 11 to 16 were different from each other and the amounts of the respective raw materials of examples 11 to 16 were the same as those of example 10, and the amounts of the respective raw materials of examples 11 to 16 were shown in Table 4.
TABLE 4 addition amounts of the respective raw materials of examples 11 to 16
Examples 17 to 20
Examples 17-20 differ from example 10 in that the process parameters for each step of examples 17-20 are different and all of them are identical to example 10, and the process parameters for each step of examples 17-20 are shown in Table 5.
TABLE 5 Process parameters for each step of examples 17-20
Comparative example
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the comparative example 1 replaces the self-made admixture with the polycarboxylic acid water reducing agent (provided by Chengdu Zhonghong building materials Co., Ltd., and the model of the polycarboxylic acid high-performance water reducing agent is CDA-3) with equal mass in the market, and the rest is consistent with the example 1.
Comparative example 2
Comparative example 2 differs from example 1 in that no ferrocene was added to comparative example 2, all of which remained the same as example 1.
Comparative example 3
Comparative example 3 differs from example 1 in that no hydroxyl-terminated polybutadiene was added to comparative example 3, and the rest was identical to example 1.
Performance detection
1. Bleeding performance, slump and spread: referring to GB/T50080-2002 Standard test methods for Performance of common concrete mixtures, the experimental results are shown in Table 6.
2. Concrete mixture volume weight: and weighing the concrete mixture by using a 5L volume-weight barrel, and calculating the volume weight of the concrete mixture, wherein the experimental results are shown in Table 6.
3. Compressive strength: referring to GB/T50081-2002 Standard test method for mechanical properties of common concrete, a plurality of cube standard test blocks with side length of 150mm are manufactured, the cube standard test blocks are respectively maintained at room temperature for 7 days and 28 days, and the compression strength is tested, and the test results are shown in Table 6.
TABLE 6 comparison table of performance test results of different concrete products
Comparative example 1 the existing water reducing agent in the market is used, the admixture prepared by the method disclosed by the application is not used, and the prepared heavy concrete product has serious bleeding condition, higher slump and expansion degree, is not beneficial to product construction, poor in product constructability and compressive strength, is not beneficial to prolonging the service life of the product and is not beneficial to product market popularization. Compared with the prior art, ferrocene is not added in the comparative example 2, the prepared heavy concrete product has serious bleeding condition, higher slump and expansion degree, is not beneficial to product construction, and has poor product constructability and low compressive strength. In comparative example 3, no hydroxyl-terminated polybutadiene is added, so that the compressive strength of the prepared heavy concrete product is slightly improved, but the compressive performance is still poor, and the service life of the product is not prolonged favorably.
Comparing the experimental results of the embodiment 1 and the comparative examples 1 to 3, it can be seen that, in the process of preparing heavy concrete, the admixture prepared by the method disclosed by the application replaces the existing water reducing agent in the market, and ferrocene and hydroxyl-terminated polybutadiene are added, so that the prepared heavy concrete product has good fluidity, proper slump and expansion degree, is beneficial to product construction, remarkably improves the construction performance of the product, has high compressive strength, is beneficial to prolonging the service life of the product, and is beneficial to product market popularization.
Comparing the experimental results of example 1 and example 2, the additive used in example 1 is the additive prepared in preparation example 1, the additive used in example 2 is the additive prepared in preparation example 2, the core material containing allyl polyoxyethylene ether, nonylphenol polyoxyethylene ether and methyl allyl polyoxyethylene ether is used in preparation example 2 to replace a single nonylphenol polyoxyethylene ether core material, the compressive strength of the prepared heavy concrete product is obviously improved, and a certain synergistic effect exists between the allyl polyoxyethylene ether, the nonylphenol polyoxyethylene ether, the methyl allyl polyoxyethylene ether and the isopentenyl polyoxyethylene ether. Compared with example 2, the admixture used in examples 3-6 of different batches has slightly reduced compression resistance because the admixture used in examples 3-6 does not adopt the best raw material proportion.
Comparing the experimental results of example 2 and example 7, in example 7, iron sand with a larger apparent density is used, and a certain amount of fly ash is added, so that the prepared heavy concrete product has better construction performance and slightly reduced compressive strength. Comparing the experimental results of example 7 and example 8, the heavy concrete product prepared by using the silica fume instead of the fly ash in example 8 has good workability, no bleeding phenomenon, proper slump and expansion degree and excellent compression resistance. Comparing the experimental results of example 8 and example 9, the compressive strength of the product is reduced by adding a small amount of boric acid in example 9, the boric acid is a high-efficiency thermal neutron absorber, the heavy concrete itself is not transparent to x-rays and gamma-rays, and the addition of boric acid in the concrete can effectively improve the neutron radiation resistance. Compared with the experimental results of the embodiment 9 and the embodiment 10, the embodiment 10 adds a certain amount of 3-methoxy catechol, the compressive strength of the prepared heavy concrete product is obviously improved, the adverse effect of boric acid on the compressive strength of the product is made up by adding the 3-methoxy catechol, and the addition of the boric acid and the 3-methoxy catechol enables the heavy concrete to have excellent neutron radiation resistance and excellent compressive property, thereby being beneficial to prolonging the service life of the product and being beneficial to the market popularization of the product.
Compared with the embodiment 10, the addition amount of each raw material in the embodiments 11 to 14 is different, and the compression resistance of the prepared heavy concrete product is changed; compared with the embodiments 11 to 14, the embodiments 15 to 16 use better raw material proportion, and the prepared concrete product has better compression resistance, is beneficial to prolonging the service life of the product and is beneficial to the market popularization of the product.
The process parameters of examples 17-20 are different compared to example 10, where the lower the agitation speed of example 17, the compression strength of the resulting heavy concrete product is slightly reduced. Examples 18-20 use appropriate process parameters, and the prepared heavy concrete has excellent compressive properties, helps to prolong the service life of the product, and is beneficial to product market promotion.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The concrete with the volume weight of more than 5000kg per cubic meter is characterized by mainly comprising the following concrete raw materials in parts by weight: 180 parts of 170-180 parts of water, 4200-4400 parts of iron sand, 6.8-13.6 parts of an admixture, 3-6 parts of ferrocene, 3.5-5 parts of hydroxyl-terminated polybutadiene and 750 parts of cement;
carrying out high-speed high-speed high-speed high-speed high-speed high-speed high-speed high-speed high-speed high; the additive is mainly prepared from the following raw materials in percentage by weight: 5.5-6.5% of hydrogen peroxide, 14-16% of sodium gluconate, 12.5-15.5% of core material, 9-11% of calcium gluconate, 4.5-5.5% of vitamin C and the balance of isopentenyl polyoxyethylene ether; the core material is a composition consisting of nonylphenol polyoxyethylene ether or nonylphenol polyoxyethylene ether, allyl polyoxyethylene ether and methyl allyl polyoxyethylene ether; the core material is composed of nonylphenol polyoxyethylene ether, allyl polyoxyethylene ether and methyl allyl polyoxyethylene ether according to the proportion of (3.5-4.5): (4.5-5.5): (4.5-5.5) in weight ratio.
2. A concrete having a bulk density in excess of 5000 kilograms per cubic meter as claimed in claim 1 wherein: the concrete raw material also comprises 90-110 parts by weight of fly ash, and the apparent density of the fly ash is not less than 2800kg/m through thin film casting.
3. A concrete having a bulk density in excess of 5000 kilograms per cubic meter as claimed in claim 1 wherein: the concrete raw material also comprises silica fume with the weight not more than 150 parts, and the apparent density of the silica fume is not less than 2900kg/m for thin year.
4. A concrete having a bulk density in excess of 5000 kilograms per cubic meter as claimed in claim 1 wherein: the concrete raw material also comprises 0.8-1.2 parts by weight of boric acid, and the apparent density of the boric acid is not less than 1430kg/m for carrying out heavy year.
5. A concrete having a bulk density in excess of 5000 kilograms per cubic meter as claimed in claim 1 wherein: the concrete raw material also comprises 2-3.5 parts by weight of 3-methoxy catechol.
6. A method of producing concrete having a bulk weight of more than 5000kg per cubic meter as claimed in any one of claims 1 to 5, comprising the steps of: weighing concrete raw materials, stirring for 120-180s to prepare the concrete with the volume weight of more than 5000kg per cubic meter.
7. The method for preparing concrete with volume weight of more than 5000kg per cubic meter according to claim 6, wherein the method for preparing the admixture comprises: weighing isopentenyl polyoxyethylene ether, stirring, heating to 85-95 ℃, adding a core material, dropwise adding hydrogen peroxide at a constant speed for 30-90min, and stirring for 150min while keeping the temperature for 100-; cooling to no more than 60 deg.C, adding vitamin C, sodium gluconate and calcium gluconate, and stirring for no less than 20min to obtain the additive.
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| JP7263587B1 (en) | 2022-03-31 | 2023-04-24 | 太平洋セメント株式会社 | Concrete and its manufacturing method |
| CN115925338A (en) * | 2022-11-30 | 2023-04-07 | 广州市泰和混凝土有限公司 | Concrete for building and preparation method thereof |
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| CN107010994A (en) * | 2017-04-14 | 2017-08-04 | 农文书 | Ultra-high performance concrete conserves the preparation method of powder |
| CN107235652A (en) * | 2017-06-30 | 2017-10-10 | 徐州市耐力高分子科技有限公司 | A kind of concrete antifreezer |
| CN110510965A (en) * | 2019-10-08 | 2019-11-29 | 广东东方混凝土有限公司 | A kind of impact resistance concrete |
| CN110655355A (en) * | 2019-10-25 | 2020-01-07 | 四川信敏绿色新建筑材料科技有限公司 | Iron sand concrete and preparation method thereof |
| CN112010604A (en) * | 2020-08-21 | 2020-12-01 | 中铁大桥局第七工程有限公司 | Pumping concrete for counterweight of steel box girder of swivel cable-stayed bridge and application of pumping concrete |
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Denomination of invention: Concrete with unit weight more than 5000 Kilogram per cubic metre and its preparation method Effective date of registration: 20230627 Granted publication date: 20211221 Pledgee: Bank of Chengdu science and technology branch of Limited by Share Ltd. Pledgor: CHENGDU PRECISION CONCRETE Co.,Ltd. Registration number: Y2023980045596 |