CN115057667A - Self-compacting concrete and production process thereof - Google Patents
Self-compacting concrete and production process thereof Download PDFInfo
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- CN115057667A CN115057667A CN202210651035.6A CN202210651035A CN115057667A CN 115057667 A CN115057667 A CN 115057667A CN 202210651035 A CN202210651035 A CN 202210651035A CN 115057667 A CN115057667 A CN 115057667A
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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
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of concrete, and particularly discloses self-compacting concrete and a production process thereof, wherein the self-compacting concrete is prepared from the following components in parts by mass: 325 parts of cement 315-; the modified fly ash mainly comprises the following components in parts by mass: 100 parts of fly ash, 5-8 parts of alkali solution, 22-28 parts of maleic anhydride and 15-20 parts of hydroxyl-terminated hyperbranched polyester. The self-compacting concrete material prepared by the application has better flowability and is not easy to generate segregation phenomenon, the defects of reduced flowability and easy segregation caused by machine-made sand can be obviously overcome, the drying shrinkage of the self-compacting concrete is obviously less than that of the self-compacting concrete of conventional fly ash, and the tensile strength and the compressive strength obviously exceed those of the conventional fly ash concrete.
Description
Technical Field
The invention relates to the field of concrete, in particular to self-compacting concrete and a production process thereof.
Background
Self-compaction concrete flow resistance is little, and it just can the leveling under the effect of self gravity, need not vibrate and can realize filling the template space, can form closely knit even main structure body after the sclerosis, can combine the needs of actual work well, improves the easy honeycomb or the cavity isotructure problem that produces of ordinary concrete, can adapt to the confined engineering structure of construction spaces such as arrangement of reinforcement closely knit, the structure is complicated, thin wall, steel pipe concrete well.
The realization of the self-compacting concrete mainly depends on a large amount of colloid materials in a system, but the great amount of silicate materials are mixed to cause the concrete after pouring to have extremely high hydration heat, so that the risk of concrete cracking is more easily caused compared with the common concrete.
The fly ash is a pozzolanic material, can replace part of cement, improves the fluidity of self-compacting concrete, and reduces the cracking risk of the self-compacting concrete. However, the inventors believe that the compressive strength of self-compacting concrete is still not high when fly ash is added.
Disclosure of Invention
In order to improve the compressive strength of the self-compacting concrete, the application provides the self-compacting concrete and a production process thereof.
The self-compacting concrete is prepared from the following components in parts by mass:
315 portion of cement
75-85 parts of mineral powder
173 and 178 portions of water
50-70 parts of modified fly ash
945 broken stone 955
380 portions of machine-made sand and 390 portions
The modified fly ash mainly comprises the following components in parts by mass:
100 portions of fly ash
5-8 parts of alkaline solution
22-28 parts of maleic anhydride
15-20 parts of hydroxyl-terminated hyperbranched polyester.
This application forms modified fly ash through fly ash, maleic anhydride and terminal hydroxyl hyperbranched polyester cooperation, and the mobility preferred of self-compaction concrete material just is difficult for appearing the segregation phenomenon, can obviously overcome the mobility that machine-made sand used and bring and reduce and easily the defect of segregation, and self-compaction concrete drying shrinkage is obviously less than the self-compaction concrete of conventional fly ash, and tensile strength and compressive strength obviously surpass conventional fly ash concrete. The modified fly ash is subjected to secondary hydration reaction in the hydration process, the generated gel can better fill pores in the concrete, the difficulty of water migration in the concrete is increased along with the continuous compaction in the concrete, and the drying shrinkage strain of the concrete is finally reduced.
Preferably, the alkali solution is calcium hydroxide solution with the mass concentration of 1-2 mol/L.
The addition of a small amount of calcium hydroxide is beneficial to improving the activity of the activated fly ash, and simultaneously can improve the fluidity of the concrete to a certain extent, so that the fluidity of the self-compacting concrete is not easy to reduce after the modified fly ash is added.
Preferably, the fly ash is grade I or grade II fly ash.
The application has better activation performance to I-grade or II-grade fly ash, and the activation performance is used as the raw material of the modified fly ash, so that the tensile strength and the compressive strength of concrete can be improved to a greater extent.
Preferably, the hydroxyl-terminated hyperbranched polyester has a hydroxyl number of 5 to 7/mol.
The hydroxyl-terminated hyperbranched polyester and the activated fly ash have good combination effect, so that a network structure generated by cement hydration and temperature rise can better transfer load, and the hydroxyl-terminated hyperbranched polyester and the activated fly ash have obvious effects on improving the contractibility of concrete and improving the compressive strength of the concrete.
Preferably, the preparation method of the modified fly ash comprises the following steps:
step 1, taking dry fly ash, grinding for 15-20min at 70-80 ℃, and then adding an alkali solution while stirring to obtain activated fly ash;
and 2, mixing the activated fly ash, the maleic anhydride and the hydroxyl-terminated hyperbranched polyester to obtain the modified fly ash.
The method comprises the following steps of grinding dry fly ash, mixing the ground dry fly ash with an alkaline solution to improve the surface activity of the fly ash, mixing activated fly ash, maleic anhydride and hydroxyl-terminated hyperbranched polyester to obtain modified fly ash, uniformly dispersing the modified fly ash in self-compacting concrete, and better combining the activated fly ash, the maleic anhydride and the hydroxyl-terminated hyperbranched polyester in the self-compacting concrete to form a uniform and stable organic-inorganic composite network framework structure, so that the contractibility of the concrete is reduced, and the tensile strength and the compressive strength of the concrete are enhanced.
Preferably, 5-10 parts of a water reducing agent is also added into the self-compacting concrete.
The addition of the water reducing agent is beneficial to improving the fluidity of the self-compacting concrete slurry and improving the fluidity of the self-compacting concrete.
Preferably, the water reducing agent is a polycarboxylate water reducing agent retarding type with the mass portion of 6-8.
The slow-setting type addition of the polycarboxylate water reducer can well improve the defect that the fluidity is reduced to a certain extent after the machine-made sand and the modified fly ash are added, and simultaneously, the self-compacting concrete keeps better segregation resistance, so that the fluidity and the segregation resistance of the self-compacting concrete are synchronously improved.
A production process of self-compacting concrete comprises the following steps:
mixing cement, mineral powder, modified fly ash and sand, uniformly stirring, then adding broken stone and water, and uniformly stirring to obtain self-compacting concrete slurry; and pouring and curing to obtain the self-compacting concrete.
Through the simple preparation method of the self-compacting concrete, the components are uniformly dispersed in the concrete, and the combination effect of the components is good.
In summary, the present application has the following beneficial effects:
1. this application constitutes modified fly ash through fly ash, maleic anhydride and terminal hydroxyl hyperbranched polyester cooperation, and self-compaction concrete mobility improves to a certain extent, and self-compaction concrete drying shrinkage is obviously less than the self-compaction concrete of conventional fly ash, and tensile strength and compressive strength obviously surpass conventional fly ash concrete.
2. The method comprises the following steps of grinding dry fly ash, mixing the ground dry fly ash with an alkali solution to improve the surface activity of the fly ash, mixing activated fly ash, maleic anhydride and hydroxyl-terminated hyperbranched polyester to obtain modified fly ash, and better combining the activated fly ash, the maleic anhydride and the hydroxyl-terminated hyperbranched polyester in self-compacting concrete to form a uniform and stable organic-inorganic composite network skeleton structure, so that the contractibility of the concrete is reduced, and the tensile strength and the compressive strength of the concrete are enhanced.
3. The slow-setting type addition of the polycarboxylate water reducer can well improve the defect that the fluidity is reduced to a certain extent after the machine-made sand and the modified fly ash are added, and simultaneously, the self-compacting concrete keeps better segregation resistance, so that the fluidity and the segregation resistance of the self-compacting concrete are synchronously improved.
Detailed Description
The raw materials used in the following examples and comparative examples are all commercially available.
Example 1
A self-compacting concrete is prepared from P. O42.5R grade cement, S95 mineral powder, tap water, 10-20mm broken stone, 2.4 fineness modulus machine-made sand and modified fly ash, and the dosage of each component is shown in Table 1 and is kg.
The production process of the self-compacting concrete comprises the following steps:
step S1, preparing modified fly ash:
step 1, taking 100kg of class II fly ash, drying at 50 ℃ for 1h, adding into a grinder, adjusting the temperature to 70 ℃, grinding for 10min, transferring the fly ash into a stirring cylinder, adding 1 mol/L5 kg of calcium hydroxide solution while stirring, and stirring for 5min to obtain the activated fly ash.
And 2, adding 22kg of maleic anhydride and 15kg of hydroxyl-terminated hyperbranched polyester (the number of hydroxyl groups is 5-7/mol, the hydroxyl group is 670mgKOH/g, the acid value is less than 15mgKOH/g, and the molecular weight is 500g/mol) to mix with the activated fly ash, and stirring for 2min to obtain the modified fly ash.
Step S2, preparing self-compacting concrete:
mixing 325kgP & O42.5R grade cement, 85kg S95 mineral powder, 50kg modified fly ash and 380kg machine-made sand, stirring for 30S, then adding 945kg of broken stone and 178kg of tap water, stirring for 50S to obtain self-compacting concrete slurry, pouring, and curing to obtain the self-compacting concrete.
Example 2
A self-compacting concrete is prepared from P. O42.5R grade cement, S95 mineral powder, tap water, 10-20mm broken stone, 2.4 fineness modulus machine-made sand and modified fly ash, and the dosage of each component is shown in Table 1 and is kg.
The production process of the self-compacting concrete comprises the following steps:
step S1, preparing modified fly ash:
step 1, taking 100kg of class II fly ash, drying at 50 ℃ for 1h, adding into a grinder, adjusting the temperature to 70 ℃, grinding for 10min, transferring the fly ash into a stirring cylinder, adding 8kg of calcium hydroxide solution of 1mol/L while stirring, and stirring for 5min to obtain the activated fly ash.
And 2, adding 28kg of maleic anhydride and 20kg of hydroxyl-terminated hyperbranched polyester (the number of hydroxyl groups is 5-7/mol, the hydroxyl group is 670mgKOH/g, the acid value is less than 15mgKOH/g, and the molecular weight is 500g/mol) to mix with the activated fly ash, and stirring for 2min to obtain the modified fly ash.
Step S2, preparing self-compacting concrete:
315kgP & O42.5R grade cement, 75kg S95 mineral powder, 70kg modified fly ash and 390kg machine-made sand are mixed and stirred for 30S, then 955kg broken stone and 173kg tap water are added and stirred for 50S to obtain self-compacting concrete slurry, and after pouring and curing, the self-compacting concrete is obtained.
Example 3
A self-compacting concrete, differing from example 2 in that: adding a polycarboxylate superplasticizer for retarding, wherein the dosage of other components is different, and the specific details are shown in table 1, and the dosage unit is kg.
The production process of the self-compacting concrete comprises the following steps:
step S1, preparing modified fly ash:
step 1, taking 100kg of class II fly ash, drying at 50 ℃ for 1h, adding into a grinder, adjusting the temperature to 70 ℃, grinding for 10min, transferring the fly ash into a stirring cylinder, adding 1mol/L of 6kg of calcium hydroxide solution while stirring, and stirring for 5min to obtain the activated fly ash.
And 2, adding 25kg of maleic anhydride and 18kg of hydroxyl-terminated hyperbranched polyester (the number of hydroxyl groups is 5-7/mol, the hydroxyl group is 670mgKOH/g, the acid value is less than 15mgKOH/g, and the molecular weight is 500g/mol) to mix with the activated fly ash, and stirring for 2min to obtain the modified fly ash.
Step S2, preparing self-compacting concrete:
mixing 320 kgP-O42.5R grade cement, 70kg of S95 mineral powder, 50kg of modified fly ash and 385kg of machine-made sand, stirring for 30S, adding 950kg of tap water and 175kg of tap water, stirring for 50S, adding 6kg of polycarboxylate superplasticizer for retarding, stirring for 40S to obtain self-compacting concrete slurry, pouring, and curing to obtain the self-compacting concrete.
Example 4
A self-compacting concrete, differing from example 3 in that: adding a polycarboxylate superplasticizer for retarding, wherein the dosage of each component is shown in table 1 in detail, and the dosage unit is kg.
The production process of the self-compacting concrete comprises the following steps:
step S1, preparing modified fly ash:
step 1, taking 100kg of fly ash, drying at 50 ℃ for 1h, adding into a grinder, adjusting the temperature to 70 ℃, grinding for 10min, transferring the fly ash into a stirring cylinder, adding 1mol/L of 6kg of calcium hydroxide solution while stirring, and stirring for 5min to obtain the activated fly ash.
And 2, adding 25kg of maleic anhydride and 18kg of hydroxyl-terminated hyperbranched polyester, mixing with the activated fly ash, and stirring for 2min to obtain the modified fly ash.
Step S2, preparing self-compacting concrete:
mixing 320kg of cement, 70kg of S95 mineral powder, 50kg of modified fly ash and 385kg of machine-made sand, stirring for 30S, adding 950kg of broken stone and 175kg of tap water, stirring for 50S, adding 8kg of polycarboxylate superplasticizer for retarding, stirring for 40S to obtain self-compacting concrete slurry, pouring, and curing to obtain the self-compacting concrete.
TABLE 1
Comparative example 1
A self-compacting concrete, differing from example 3 in that: the fly ash is not subjected to activation treatment, and specifically comprises the following steps: step S1, preparing modified fly ash: mixing 25kg of maleic anhydride and 18kg of hydroxyl-terminated hyperbranched polyester with activated fly ash, and stirring for 2min to obtain the modified fly ash.
Step S2, preparing self-compacting concrete: mixing 320kg of cement, 70kg of mineral powder, 50kg of modified fly ash, 385kg of machine-made sand and 6kg of polycarboxylic acid water reducer, carrying out delayed coagulation for 30s, adding 950kg of broken stone and 175kg of tap water, carrying out stirring for 50s to obtain self-compacting concrete slurry, and pouring and curing to obtain the self-compacting concrete.
Comparative example 2
A self-compacting concrete, differing from example 3 in that: the maleic anhydride, the hydroxyl-terminated hyperbranched polyester and the activated fly ash are directly added into the self-compacting concrete. The method specifically comprises the following steps:
taking 100kg of fly ash, drying at 50 ℃ for 1h, then adding into a grinder, adjusting the temperature to 70 ℃, grinding for 10min, transferring the fly ash into a stirring cylinder, adding 1mol/L of 6kg of calcium hydroxide solution while stirring, and stirring for 5min to obtain the activated fly ash.
Mixing 320kg of cement, 70kg of mineral powder, 60kg of activated fly ash, 385kg of machine-made sand, 25kg of maleic anhydride, 6kg of polycarboxylate superplasticizer retarding type and 18kg of hydroxyl-terminated hyperbranched polyester, stirring for 30s, then adding 950kg of macadam and 175kg of tap water, stirring for 50s to obtain self-compacting concrete slurry, pouring, and curing to obtain the self-compacting concrete.
Experiment 1
Slump spread
The slump spread of the above examples and comparative self-compacting concrete was tested, see JGJ/T283-2012 "technical specification for self-compacting concrete application".
Experiment 2
28d compressive strength
Referring to GB/T50081-2019 'test method standards for physical and mechanical properties of concrete', the self-compacting concrete compression strength test blocks of the above examples and comparative examples are respectively prepared, the sizes are 150mm multiplied by 150mm, and the self-compacting concrete compression strength test blocks are maintained for 28 days and tested.
Experiment 3
Referring to GB/T50082-2009 Standard test methods for testing the long-term performance and durability of ordinary concrete, the above examples and dry shrinkage test blocks of proportional self-compacting concrete, which have the dimensions of 100mm × 100mm × 515mm, were prepared, and after curing for 24 hours in an indoor environment, the test blocks were placed in a curing room at a curing temperature of (20 ± 2) ° C and a relative humidity of (60 ± 5)% for curing, and the dry shrinkage strain was tested for 100 days.
Experiment 4
The splitting tensile strength is referred to GB/T50081-2002 Standard of common concrete mechanical property experiment method, the splitting tensile strength test blocks of the embodiment and the comparative self-compacting concrete are prepared, the size is 150mm multiplied by 150mm, and the end face splitting tensile strength of a core sample of 100mm multiplied by 100mm is drilled from the concrete sample.
The results of the above experiments are shown in table 2.
TABLE 2
As can be seen from the comparison of the test data of example 3 and comparative example 1 in Table 2, the activated fly ash is adopted in example 3, and the fly ash is premixed with the maleic anhydride and the hydroxyl-terminated hyperbranched polyester, the conventional fly ash is adopted in comparative example 1, the activated fly ash is adopted in comparative example 2, but the activated fly ash is not premixed with the maleic anhydride and the hydroxyl-terminated hyperbranched polyester and is directly added into the concrete, the slump expansion of example 3 is increased relative to that of comparative example 1-2, the 28d compressive strength and the cleavage tensile strength are obviously improved relative to that of comparative example 1-2, the 100d drying shrinkage strain is obviously reduced relative to that of comparative example 1-2, and the slump expansion, the compressive strength, the drying shrinkage strain and the cleavage tensile strength of example 3 are the most different from those of comparative example 1, which proves that the activation treatment of the fly ash is the key for realizing the improvement of the working performance and the mechanical strength of the self-compacting concrete, meanwhile, premixing the fly ash, the maleic anhydride and the hydroxyl-terminated hyperbranched polyester has an important effect on improving the reaction effect among the fly ash, the maleic anhydride and the hydroxyl-terminated hyperbranched polyester, so that the activated fly ash in the embodiment 3 has a better reaction effect with the maleic anhydride and the hydroxyl-terminated hyperbranched polyester, thereby forming a very complex organic-inorganic network support structure, playing a stable support role on the self-compacting concrete, enhancing the mechanical property of the self-compacting concrete and reducing the contractility, the reaction effect of the conventional fly ash in the comparative example 1 on the maleic anhydride and the hydroxyl-terminated hyperbranched polyester is poorer, the comparative example 2 does not mix the activated fly ash with the maleic anhydride and the hydroxyl-terminated hyperbranched polyester in advance, and is difficult to form a stable network framework to support the concrete structure, and the compressive strength and the splitting tensile strength of the self-compacting concrete are enhanced, The effect of concrete shrinkage reduction is significantly reduced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A self-compacting concrete, characterized in that: the adhesive is prepared from the following components in parts by mass:
315 portion of cement
75-85 parts of mineral powder
173 and 178 portions of water
50-70 parts of modified fly ash
945 broken stone 955
380 portions of machine-made sand and 390 portions
The modified fly ash mainly comprises the following components in parts by mass:
100 portions of fly ash
5-8 parts of alkaline solution
22-28 parts of maleic anhydride
15-20 parts of hydroxyl-terminated hyperbranched polyester.
2. A self-compacting concrete according to claim 1, characterized in that: the alkali solution is calcium hydroxide solution with the mass concentration of 1-2 mol/L.
3. A self-compacting concrete according to claim 1, characterized in that: the fly ash is I-grade or II-grade fly ash.
4. A self-compacting concrete according to claim 1, characterized in that: the density of the hydroxyl-terminated hyperbranched polyester is 0.9-1 g/mol.
5. A self-compacting concrete according to claim 1, characterised in that: the preparation method of the modified fly ash comprises the following steps:
step 1, taking dry fly ash, grinding for 15-20min at 70-80 ℃, and then adding an alkali solution while stirring to obtain activated fly ash;
and 2, mixing the activated fly ash, the maleic anhydride and the hydroxyl-terminated hyperbranched polyester to obtain the modified fly ash.
6. A self-compacting concrete according to claim 1, characterised in that: 5-10 parts of a water reducing agent is also added into the self-compacting concrete.
7. A self-compacting concrete according to claim 6, characterised in that: the water reducing agent is a polycarboxylate water reducing agent retarding type with the mass portion of 6-8.
8. A process for the production of self-compacting concrete according to any one of claims 1 to 7, characterized in that: the method comprises the following steps: mixing cement, mineral powder, modified fly ash and sand, uniformly stirring, then adding broken stone and water, and uniformly stirring to obtain self-compacting concrete slurry; and pouring and curing to obtain the self-compacting concrete.
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| CN116177934A (en) * | 2022-12-28 | 2023-05-30 | 佛山市南海科明达混凝土有限公司 | Self-compacting concrete and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116177934A (en) * | 2022-12-28 | 2023-05-30 | 佛山市南海科明达混凝土有限公司 | Self-compacting concrete and preparation method thereof |
| CN116177934B (en) * | 2022-12-28 | 2023-11-03 | 佛山市南海科明达混凝土有限公司 | Self-compacting concrete and preparation method thereof |
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| CN115057667B (en) | 2023-01-10 |
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