CN115368088A - Preparation method of formed concrete - Google Patents
Preparation method of formed concrete Download PDFInfo
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- CN115368088A CN115368088A CN202211199908.0A CN202211199908A CN115368088A CN 115368088 A CN115368088 A CN 115368088A CN 202211199908 A CN202211199908 A CN 202211199908A CN 115368088 A CN115368088 A CN 115368088A
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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
- C04B2201/50—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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Abstract
The invention provides a preparation method of formed concrete, which comprises the following steps: step one, cement pretreatment; step two, preparing a first mother solution; step three, preparing a second mother solution; and step four, obtaining the formed concrete. The method adopts conventional organic matters as raw materials to obtain a solid-state formed concrete structure, the formed concrete prepared by the method does not have hydrolysis reaction and has good stability, and meanwhile, the method does not need to add a large amount of additives, has low cost, basically does not have attenuation on the later-stage compressive strength and has high safety.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a preparation method of formed concrete.
Background
In the construction process of concrete structures, due to the influence of environmental conditions such as different climates, geology, hydrology and the like and the performance required by the structures, certain specific additives are required to be added into concrete mixtures, so that the setting time of the concrete is changed, the fluidity of the concrete mixtures is improved, the compactness of the concrete mixtures is improved, and the anti-seepage capability and the durability of the concrete are enhanced.
The accelerator is an additive capable of accelerating the setting and hardening of the cement concrete; the accelerating agent can be divided into aluminoxy clinker, water glass, aluminate, aluminum sulfate and aluminum hydroxide according to the main components; the accelerators can be classified into alkaline accelerators and alkali-free accelerators according to the alkali content. At present, domestic accelerator for sprayed concrete gradually develops towards low-alkali and alkali-free liquid accelerator, but the use of the alkali-free liquid accelerator is still not universal enough, and the following problems mainly exist: firstly, the stability is poor, the raw materials for preparing the alkali-free liquid accelerator at home and abroad are basically aluminum compounds, aluminum ions are easy to generate hydrolysis reaction in water, the solubility of aluminum salt is low, and the alkali-free liquid accelerator is easy to generate unstable phenomena such as flocculation, precipitation, crystallization and the like along with the prolonging of time; secondly, the mixing amount is large, the alkali-free liquid accelerator has the problems of low solubility or hydrolysis reaction of raw materials, the mixing amount of the accelerator is generally required to be increased to achieve a certain accelerating effect, and the mixing amount is large and the production cost is high; thirdly, the accelerator contains toxic raw materials, and a fluorine-containing compound is one of the main raw materials of many alkali-free liquid accelerators at present, because fluorine ions can improve the strength of concrete by promoting the hydration of cement and accelerating the setting and hardening of the cement, and the fluorine-containing compound can also be used as a complexing agent to form a stable complex system with aluminum sulfate, so that the content of aluminum ions in an aqueous solution is increased, but a large amount of fluorine-containing compound is contacted to cause fluorosis of a human body and harm to the health of the human body; fourthly, the compressive strength of the cement concrete is easy to attenuate along with the time, and the final strength of the concrete is influenced.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a method for preparing formed concrete, which adopts conventional organic matters as raw materials to obtain a solid-state formed concrete structure, and the formed concrete prepared by the method has the advantages of no hydrolysis reaction, good stability, no need of adding a large amount of additives, low cost, basically no attenuation of later-stage compressive strength and high safety.
The purpose of the invention is realized by the following technical scheme:
the preparation method of the formed concrete is characterized by comprising the following steps:
step one, cement pretreatment: uniformly mixing silicate cement and water, uniformly dividing the mixture into two large parts of cement, and then dividing the two large parts of cement into a first small part and a second small part respectively for later use;
step two, preparing a first mother solution: adding N' N methylene bisacrylamide and acrylamide into the first small part of one large part of cement, and uniformly mixing to obtain a solution a 1 And adding the same large amount of waterAdding ammonium persulfate into the second small part of the mud, and uniformly mixing to obtain a solution b 1 (ii) a Mixing the solution a 1 With solution b 1 Uniformly mixing for later use;
step three, preparing a second mother solution: adding water-thinned bisphenol A epoxy resin into the first small cement part and mixing to obtain solution a 2 Adding acrylamide into the second small part of the same large cement part, and uniformly mixing to obtain a solution b 2 ；
Step four, obtaining the formed concrete: mixing the solution a obtained in the third step 2 With solution b 2 And (3) uniformly mixing, adding the mixed solution (namely the first mother solution) finally obtained in the step (II) at the time of the tth moment after mixing, stirring, reversing the mold, and standing to obtain the formed concrete.
According to the method, N' N methylene bisacrylamide and acrylamide are subjected to free radical polymerization reaction under the initiation action of ammonium persulfate to generate a polyacrylamide reticular polymer; acrylamide and bisphenol A epoxy resin generate a network polymer structure through the gradual ring-opening reaction of the acrylamide and the bisphenol A epoxy resin. Thereafter, a first mother liquor is added to the solution a 2 With solution b 2 In the mixed system, the polyacrylamide network polymer finally generated from the first mother liquor contains primary amine, and when the polyacrylamide network polymer and the solution a are mixed, the polyacrylamide network polymer and the solution a 2 With solution b 2 The bisphenol a epoxy resin remaining in the mixed system is subjected to ring opening step by step, so that a polymer with a larger net area and more branched chains is generated (the polymer is collectively referred to as a macromolecular polymerization structure in the application, and the same applies below); when the first mother liquor finally forms polyacrylamide reticular polymer and the solution a 2 With solution b 2 When the bisphenol A epoxy resin remaining in the mixed system is subjected to ring opening, the reaction is terminated after the tertiary amine is generated due to steric effect, and the reaction from the solution a is suppressed 2 With solution b 2 The hydroxyl group of the product in the mixed system continues to perform ring-opening reaction with the bisphenol A epoxy resin until the final product of the first mother liquor completely consumes the residual bisphenol A epoxy resin. Then, macromolecular polymeric structure is polymerized with the solution a 2 Dissolving togetherLiquid b 2 The products in the mixed system (namely, the products after the ring opening of the acrylamide and the bisphenol A epoxy resin) are further combined to generate a mixed system with a more stable structure; the product contains a large amount of benzene rings, so that the epoxy polymer after ring opening has high strength, the tensile strength of the cured cement is effectively improved, and the defect that the strength is attenuated along with the time is overcome. Meanwhile, the whole system of the cement mortar has the advantages of thorough reaction, no side reaction, higher stability, no easy hydrolysis reaction and realization of quick setting of cement.
Further optimization is carried out, wherein the weight ratio of the portland cement to the water adopted in the step one is 37-43: 11 to 17.
Further optimization is carried out, the weight ratio of the first small part to the second small part in the same large part of cement in the step one is 18-22: 6 to 8.
And further optimizing, wherein in the second step, the weight ratio of the N' N methylene bisacrylamide to the acrylamide to the first small part of cement is 8-12: 0.8 to 1.2:180 to 220 percent; the weight ratio of ammonium persulfate to the second small part of cement is 1.5-2.5: 60 to 80.
Further optimizing, the weight ratio of the bisphenol A epoxy resin to the first small part of cement in the third step is 0.8-1.2: 18 to 22; the weight ratio of the acrylamide to the second small part of cement is 1.5-2.5: 60 to 80.
And further optimizing, wherein t in the fourth step is 15-30 s.
Further optimization, the stirring, the mold reversing and the standing in the fourth step are specifically as follows: firstly, stirring at a low speed of 4-6 s and a stirring speed of 45-65 r/min, and then stirring at a high speed of 13-17 s and a stirring speed of 150-180 r/min; and finally, quickly pouring the slurry obtained by stirring into a mould to be strickled off, and waiting for the slurry to be coagulated to obtain the formed concrete.
The invention has the following technical effects:
compared with the prior art, the cement additive adopted by the application has less dosage which only accounts for 4-6% of the total proportion, and the use cost is low; and the accelerator in this application belongs to the scope of alkali-free liquid accelerator, can play high-efficient, quick setting effect to cement concrete, and the initial setting time is no longer than 1min. In addition, the additive has good stability, the organic compound does not have hydrolysis in the later period, the reaction is complete, and no side reaction is generated, so that the full and efficient utilization of all raw materials is realized; and the cement intensity after this application condenses is high, adopt the additive in this application cement later stage compressive strength after condensing can not take place the decay basically to effectively avoid because the potential safety hazard that later stage cement compressive strength decay appears.
And the raw materials that this application adopted are conventional easily to be got, are applicable to the workman and operate under various environment, have reduced cement concrete greatly to operating workman's health damage.
Drawings
FIG. 1 is a schematic diagram of the reaction process in a first mother liquor in the examples of the present application; wherein, the value of n is 8-10, and the number average molecular weight of the product is about 1500.
FIG. 2 shows the solution a in the examples of the present application 2 With solution b 2 A schematic diagram of the reaction processes involved in the system obtained after mixing; wherein, FIG. 2 (a) is a reaction scheme of primary amine in acrylamide and bisphenol A type epoxy resin; FIG. 2 (b) is a schematic diagram showing the reaction of a secondary amine formed after the reaction of a primary amine with a bisphenol A type epoxy resin; FIG. 2 (c) is a schematic view showing the reaction of a tertiary amine produced after the reaction of a secondary amine with a bisphenol A type epoxy resin; meanwhile, R1 is an acryloyl group, and R2 is a bisphenol A structural group.
FIG. 3 is a molecular structural diagram of a macromolecular polymeric structure having a tertiary amine structure in an example of the present application; wherein R2 is bisphenol A structural group, n is 8-10, and the number average molecular weight of the product is about 12000.
FIG. 4 shows the solution a in the examples of the present application 2 With solution b 2 Infrared spectrum of the system obtained after mixing.
Fig. 5 is an infrared spectrum of a formed concrete system finally obtained in the practice of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1:
the preparation method of the formed concrete is characterized by comprising the following steps:
step one, cement pretreatment: uniformly mixing 370 parts by weight of Portland cement (P.O 42.5.5) and 110 parts by weight of water (W/C = 0.35), uniformly dividing the mixture into two large parts of cement (the amount of each large part of cement is 240 parts by weight), and dividing the two large parts of cement into a first small part and a second small part respectively, wherein the first small part of the two large parts of cement is 180 parts by weight, and the second small part of the two large parts of cement is 60 parts by weight for later use;
step two, preparing a first mother solution: adding N 'N methylene bisacrylamide and acrylamide into a first small part of one large part of cement, wherein the dosage of the N' N methylene bisacrylamide and the dosage of the acrylamide are respectively as follows: 8 parts by weight and 0.8 part by weight are mixed evenly to obtain solution a 1 And adding ammonium persulfate and the ammonium persulfate into the second small part of the same large part of cement according to the following dosage: 1.5 parts by weight, and mixing well to obtain solution b 1 (ii) a Mixing the solution a 1 With solution b 1 Uniformly mixing for later use; (the rate of mixing is not limited and it is sufficient to ensure that the raw materials in the first mother liquor are uniformly mixed.)
Step three, preparing a second mother solution: adding water-based bisphenol A epoxy resin into the first small part of the other large part of cement, wherein the dosage of the bisphenol A epoxy resin is as follows: 8 parts by weight of the mixture is mixed evenly to obtain a solution a 2 Adding acrylamide and 1.5 weight parts of acrylamide into the second small part of the same cement, and mixing to obtain solution b 2 ；
Step four, obtaining the formed concrete: mixing the solution a obtained in the third step 2 And b 2 Mixing uniformly, and adding into step two at 15s after mixingThe mixed solution finally obtained (i.e. from solution a) 1 With solution b 1 First mother liquor obtained after uniform mixing); then, low-speed stirring is carried out for 4s at a stirring speed of 45r/min, and then high-speed stirring is carried out for 13s at a stirring speed of 150r/min; and finally pouring the uniformly mixed slurry into a prepared mould to be strickled off, and obtaining the formed concrete structure after the slurry is coagulated.
The whole time from the second step to the fourth step, namely the whole time from the addition of the first mother liquor raw material to the initial setting of the final cement, is not more than 2min.
Example 2:
the preparation method of the formed concrete is characterized by comprising the following steps:
step one, cement pretreatment: uniformly mixing 400 parts by weight of Portland cement (P.O 42.5.5) and 140 parts by weight of water (W/C = 0.35), uniformly dividing the mixture into two large parts of cement (the amount of each large part of cement is 270 parts by weight), and dividing the two large parts of cement into a first small part and a second small part respectively, wherein the first small part of the two large parts of cement is 200 parts by weight, and the second small part of the two large parts of cement is 70 parts by weight for later use;
step two, preparing a first mother solution: adding N 'N methylene-bis-acrylamide and acrylamide into a first small part of a large part of cement, wherein the dosage of the N' N methylene-bis-acrylamide and the dosage of the acrylamide are respectively as follows: mixing 10 weight parts and 1 weight part to obtain solution a 1 And adding the ammonium persulfate and the ammonium persulfate into the second small part of the same large part of cement according to the following dosage: 2 parts by weight of the mixture are mixed evenly to obtain a solution b 1 (ii) a Mixing the solution a 1 With solution b 1 Uniformly mixing for later use; (the rate of mixing is not limited and it is sufficient to ensure that the raw materials in the first mother liquor are uniformly mixed.)
Step three, preparing a second mother solution: adding the water-based bisphenol A epoxy resin into the first small part of the other large part of cement, wherein the dosage of the bisphenol A epoxy resin is as follows: 10 parts by weight, and mixing well to obtain a solution a 2 Adding 2 weight parts of acrylamide and 2 weight parts of acrylamide into the second small part of the same large cement, and uniformly mixing to obtain a solution b 2 ；
Step four, obtaining the formed concrete: mixing the solution a obtained in the third step 2 And b 2 Uniformly mixing, and adding the mixed solution finally obtained in the second step (namely the mixed solution a) at the 20 th time after mixing 1 With solution b 1 First mother liquor obtained after uniform mixing); then, firstly stirring at low speed for 5s at the stirring speed of 55r/min, and then stirring at high speed for 15s at the stirring speed of 165r/min; and finally, pouring the uniformly mixed slurry into a pre-prepared mould to be strickled off, and obtaining the formed concrete structure after the slurry is coagulated.
The whole time from the second step to the fourth step, namely the whole time from the addition of the first mother liquor raw material to the initial setting of the final cement, is not more than 2min.
FIG. 4 shows a solution a in this example 2 And b 2 Testing an infrared spectrogram of the thickness at the 10 th s after uniform mixing; 917cm, as shown in FIG. 4 -1 The characteristic peak of epoxy appears on the left and right, and the characteristic peak of a reticular polymer structure also appears (namely, the product shown in figure 2 (c)) proves that the solution a 2 And b 2 Reacting to form a network polymer structure, and remaining the bisphenol A type epoxy resin with 2900-3300cm -1 The peak is the characteristic peak of intramolecular hydroxyl, 1270-1280 cm -1 The peak is characteristic of ether bond.
FIG. 5 shows the final product obtained in this example (i.e. the first mother liquor and the second mother liquor in step four) 2 With solution b 2 After mixing of the system obtained after mixing) an infrared spectrum; wherein, 1600 to 1660cm -1 The absorption peak is the acrylamide characteristic absorption peak, 1250-1260 cm -1 Is shown as a characteristic absorption peak for p-benzene (bisphenol A) and 916cm -1 No peak position is found, which indicates that the epoxy functional group has completely reacted, 2900-3300cm -1 The peak position of the intramolecular hydroxyl group is positioned; the above characteristic peaks show that the raw materials in this example were completely reacted and no bisphenol a epoxy resin remained.
Example 3:
the preparation method of the formed concrete is characterized by comprising the following steps:
step one, cement pretreatment: uniformly mixing 430 parts by weight of portland cement (P.O 42.5.5) and 170 parts by weight of water (W/C = 0.35), uniformly dividing the mixture into two large parts of cement (the amount of each large part of cement is 300 parts by weight), and dividing the two large parts of cement into a first small part and a second small part respectively, wherein the first small part of the two large parts of cement is 220 parts by weight, and the second small part of the two large parts of cement is 80 parts by weight for later use;
step two, preparing a first mother solution: adding N 'N methylene bisacrylamide and acrylamide into a first small part of one large part of cement, wherein the dosage of the N' N methylene bisacrylamide and the dosage of the acrylamide are respectively as follows: mixing 12 weight parts and 1.2 weight parts to obtain solution a 1 And adding the ammonium persulfate and the ammonium persulfate into the second small part of the same large-size cement according to the following dosage: 2.5 parts by weight of the total amount of the components are mixed evenly to obtain a solution b 1 (ii) a Mixing the solution a 1 With solution b 1 Uniformly mixing for later use; (the rate of mixing is not limited and it is sufficient to ensure that the raw materials in the first mother liquor are uniformly mixed.)
Step three, preparing a second mother solution: adding water-based bisphenol A epoxy resin into the first small part of the other large part of cement, wherein the dosage of the bisphenol A epoxy resin is as follows: 12 parts by weight, and uniformly mixing to obtain a solution a 2 Adding 2.5 parts by weight of acrylamide into the second small part of the same large part of cement, and uniformly mixing to obtain a solution b 2 ；
Step four, obtaining the formed concrete: mixing the solution a obtained in the third step 2 And b 2 Uniformly mixing, and adding the mixed solution finally obtained in the second step (namely the mixed solution a) at the 30 th time after mixing 1 With solution b 1 First mother liquor obtained after uniform mixing); then, firstly stirring at a low speed for 6s at a stirring speed of 65r/min, and then stirring at a high speed for 17s at a stirring speed of 180r/min; and finally pouring the uniformly mixed slurry into a prepared mould to be strickled off, and obtaining the formed concrete structure after the slurry is coagulated.
The whole time from the second step to the fourth step, namely the whole time from the addition of the first mother liquor raw material to the initial setting of the final cement, is not more than 2min.
Comparative example 1:
400 parts by weight of Portland cement (P.0 42.5.5) and 140 parts by weight of water (W/C = 0.35) are uniformly mixed, no additive is added, the mixture is poured into a prepared mold to be stricken off, and a formed concrete structure is obtained after slurry is coagulated. Comparative example 2:
uniformly mixing 400 parts by weight of Portland cement (P.0 42.5.5) and 140 parts by weight of water (W/C = 0.35), and dividing into a first part of 400 parts by weight and a second part of 140 parts by weight; adding N 'N methylene-bis-acrylamide and acrylamide into the first small part of cement, wherein the dosage of the N' N methylene-bis-acrylamide and the dosage of the acrylamide are respectively as follows: uniformly mixing 20 parts by weight and 2 parts by weight to obtain a solution A, adding 4 parts by weight of ammonium persulfate and the amount of ammonium persulfate into the second small part of cement, and uniformly mixing to obtain a solution B; and then uniformly mixing the solution A and the solution B, pouring the mixture into a prepared mould, strickling the mixture, and waiting for the slurry to be coagulated to obtain the formed concrete structure.
Comparative example 3:
uniformly mixing 400 parts by weight of Portland cement (P.0 42.5.5) and 140 parts by weight of water (W/C = 0.35), and dividing into a first part of 400 parts by weight and a second part of 140 parts by weight; adding the water-based bisphenol A epoxy resin into the first small part of cement, wherein the dosage of the bisphenol A epoxy resin is as follows: 20 parts by weight of the mixture is uniformly mixed to obtain a solution A, acrylamide and 4 parts by weight of acrylamide are added into the second small part of cement, and the mixture is uniformly mixed to obtain a solution B; and then uniformly mixing the solution A and the solution B, pouring the mixture into a prepared mould, strickling the mixture, and waiting for the slurry to be coagulated to obtain the formed concrete structure.
The cement in example 2 and comparative examples 1 to 3 was tested for initial setting time, final setting time, and later (1 d, 28d, 90 d) compressive strength according to the national standard "CBT 35159-2017 accelerator for shotcrete" (test items refer to Table 1 below), and the test results refer to Table 2 below.
Table 1: the performance of the neat paste and the mortar of the admixture accelerating agent is as follows:
table 2: and (3) testing results:
in the table, the 28d compressive strength ratio is a ratio with respect to the compressive strength without an accelerator, such as in the case of comparative example 1; the 90d compressive strength retention is the ratio for the compressive strength after 28d full cure.
As is evident from the table above: under the condition that no accelerator or additive is added to the portland cement, the initial setting time and the final setting time of the portland cement are extremely long, and the strength of the mortar is not obviously improved after the mortar is cured; while the initial setting time and the final setting time of the cement using the first mother liquor (comparative example 2) and the second mother liquor (comparative example 3) as the additives are obviously shortened, the compressive strength of the mortar after 28d is obviously reduced compared with that without the accelerator, and the retention rate of the compressive strength of 90d is relatively not very obvious by using the first mother liquor or the second mother liquor as the additives. And this application is simultaneously through the combination of first mother liquor and second mother liquor as the additive of cement, because synthetic macromolecule network structure system makes cement have faster setting time and higher intensity, thereby make compressive strength after 1d obvious higher in this application embodiment, and compressive strength after its 28d does not lose basically, compressive strength retention after 90d is very high, further show this application in the later stage of preparing the shaping concrete, its macromolecule polymeric structure with by solution a 2 With solution b 2 The products in the mixed system (i.e., the products of the ring-opening of the acrylamide and the bisphenol A epoxy resin) are further combined to form a mixed system having a more stable structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A preparation method of the formed concrete is characterized by comprising the following steps: the method comprises the following steps:
step one, cement pretreatment: uniformly mixing silicate cement and water, uniformly dividing the mixture into two large parts of cement, and then dividing the two large parts of cement into a first small part and a second small part respectively for later use;
step two, preparing a first mother solution: adding into the first small part of one large part of cementN’NMethylene bisacrylamide and acrylamide are evenly mixed to obtain solutiona 1 Adding ammonium persulfate into the second small part of the same large cement part, and mixing uniformly to obtain a solutionb 1 (ii) a Mixing the solutiona 1 And solutionsb 1 Uniformly mixing for later use;
step three, preparing a second mother solution: adding water-thinned bisphenol A epoxy resin into the first small cement part and mixing to obtain solutiona 2 Adding acrylamide into the second small part of the same cement, and mixing to obtain a solutionb 2 ；
Step four, obtaining the formed concrete: mixing the solution obtained in the third stepa 2 Andb 2 mixing uniformly, and after mixingtAnd D, adding the mixed solution finally obtained in the step two, stirring, reversing the mold, and standing to obtain the formed concrete.
2. The method for preparing a shaped concrete according to claim 1, wherein: the weight ratio of the Portland cement to the water adopted in the first step is 37-43: 11 to 17.
3. A method of producing a shaped concrete according to claim 1 or 2: in the step one, the weight ratio of the first small part to the second small part in the same large part of cement is 18-22: 6 to 8.
4. A method for producing a shaped concrete according to any one of claims 1 to 3, characterized in that: in the second stepN’NThe weight ratio of the methylene bisacrylamide to the acrylamide to the first small part of cement is 8-12: 0.8 to 1.2:180 to 220 percent; the weight ratio of ammonium persulfate to the second small part of cement is 1.5-2.5: 60 to 80.
5. The method for producing a shaped concrete according to any one of claims 1 to 4, wherein: in the third step, the weight ratio of the bisphenol A epoxy resin to the first small part of cement is 0.8-1.2: 18 to 22; the weight ratio of the acrylamide to the second small part of cement is 1.5-2.5: 60 to 80.
6. The method for preparing the shaped concrete according to claim 1, wherein: in the fourth steptIs 15-30 s.
7. The method for producing a shaped concrete according to claim 1 or 6, wherein: the stirring, the mold reversing and the standing in the fourth step are specifically as follows: firstly, stirring at a low speed of 4-6 s and a stirring speed of 45-65 r/min, and then stirring at a high speed of 13-17 s and a stirring speed of 150-180 r/min; and finally, quickly pouring the slurry obtained by stirring into a mould to be strickled off, and waiting for the slurry to be coagulated to obtain the formed concrete.
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