A concrete, a method for producing the same and a casting process

Abstract

The application belongs to the technical field of concrete, and specifically provides a kind of concrete, a preparation method thereof and a site pouring process.The concrete comprises the following raw materials by weight: 200-280 parts of sulphoaluminate cement, 70-90 parts of ordinary portland cement, 100-135 parts of slag powder, 15-25 parts of gypsum, 20-50 parts of limestone powder, 650-780 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 30-65 parts of rice husk ash, 10-15 parts of sodium alginate derivative, 3-6.5 parts of sodium acrylate, 2-3.5 parts of polycarboxylate superplasticizer, 0.1-0.3 parts of defoaming agent, and 160-190 parts of water.The concrete prepared by the application has good mechanical properties and corrosion resistance.

Description

Technical Field

[0001] This application belongs to the field of concrete technology, and in particular relates to a type of concrete, its preparation method, and its on-site pouring process. Background Technology

[0002] Wastewater treatment projects are essential infrastructure for residents' daily lives and occupy an important position in urban wastewater treatment systems. The architectural structures of wastewater treatment facilities differ significantly from ordinary buildings. For example, sewage discharge pipes and wastewater treatment ponds are large-volume concrete structures that are in constant contact with wastewater, thus requiring higher standards for crack resistance, seepage prevention, and corrosion resistance.

[0003] Urban sewage contains a large amount of sulfates. These sulfates, after microbial reduction and oxidation, form sulfuric acid. Both sulfuric acid and sulfates corrode concrete structures, causing cracking and allowing more corrosive media to penetrate the concrete, inducing steel corrosion, accelerating overall structural deterioration, severely weakening the structural load-bearing capacity, and reducing service life. The performance of concrete materials directly determines the crack resistance and lifespan of building structures. Therefore, improving the crack resistance and impermeability of concrete in sewage environments requires comprehensive consideration of cement, aggregates, mix proportions, and admixtures. Regarding the selection of cementitious materials, some technicians prioritize ordinary Portland cement with lower heat of hydration and optimize its performance by adding mineral admixtures. For example, adding fly ash and slag can reduce cement usage, decrease heat release during hydration, and improve concrete workability. Other methods include adding calcium-magnesium composite expansion agents or heat of hydration regulators to the system to reduce the heat release during concrete hydration, or compensating for concrete shrinkage to improve the crack resistance and impermeability of concrete.

[0004] However, given the increasingly complex wastewater media, it is of great technical significance to further optimize the performance of concrete materials in wastewater environments and suppress the crack resistance, seepage prevention, and corrosion resistance of related concrete structures. Summary of the Invention

[0005] To address the aforementioned issues and further improve the crack resistance and corrosion resistance of concrete, this application provides a concrete, its preparation method, and its on-site pouring process.

[0006] This application first provides a concrete comprising the following raw materials in parts by weight: 200-280 parts of sulfoaluminate cement, 70-90 parts of ordinary silicate cement, 100-135 parts of slag powder, 15-25 parts of gypsum, 20-50 parts of limestone powder, 650-780 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 30-65 parts of rice husk ash, 10-15 parts of sodium alginate derivative, 3-6.5 parts of sodium acrylate, 2-3.5 parts of polycarboxylate superplasticizer, 0.1-0.3 parts of defoamer, and 160-190 parts of water.

[0007] Furthermore, the preparation method of the sodium alginate derivative includes the following steps: 1) Sodium alginate was prepared by reacting sodium alginate with 3-aminophenylboronic acid; 2) Dissolve polyvinyl alcohol in deionized water, adjust the pH to alkaline, add phenylboronic acid-grafted sodium alginate and mix well, then add calcium chloride solution, and after complexation, obtain the base solution; 3) Adjust the pH of the base solution to acidic, let it stand, then adjust the pH to alkaline, and then add the monosaccharide and Ca complex, and stir well to obtain the final product.

[0008] Furthermore, in step 2), the mass ratio of polyvinyl alcohol to phenylboronic acid-grafted sodium alginate is 1:(0.65-0.8).

[0009] Furthermore, the average molecular weight of the polyvinyl alcohol is 20,000-150,000.

[0010] Furthermore, in step 3), the Ca complex is prepared by reacting a Schiff base ligand with calcium acetate.

[0011] Furthermore, the Schiff base ligand is prepared by condensation of salicylaldehyde and ethylenediamine.

[0012] Furthermore, in step 3), the monosaccharide is one of glucose, fructose, or galactose.

[0013] This application also provides a method for preparing concrete, comprising the following steps: S1: Weigh out sulfoaluminate cement, ordinary silicate cement, slag powder, gypsum, limestone powder, fine aggregate, coarse aggregate, and rice husk ash according to the proportion, and put them into a mixer to mix to obtain dry mix. S2: Take water, sodium acrylate, sodium alginate derivative, polycarboxylate superplasticizer, defoamer, and ammonium persulfate, mix them evenly, and then add the dry mix and wet mix to obtain the final product.

[0014] Furthermore, in step 2), the wet mixing time is 2-5 minutes.

[0015] This application also provides an on-site casting process, including the following steps: base treatment: clean the base layer and moisten the base surface with water until it is saturated and dry; formwork erection: erect the formwork according to the design requirements, ensuring tight joints, and apply a release agent; casting: pour the concrete in layers and vibrate each layer to ensure compaction; finishing and curing: after the concrete is poured and vibrated, finish the surface and then cover it for moisture curing; demolding and post-curing: after the concrete strength reaches the design requirements, remove the demolding and continue to cure with moisture until the specified age.

[0016] Compared with the prior art, this application has the following beneficial effects: This application employs sulfoaluminate cement, ordinary silicate cement, slag, and rice husk ash as a composite gel system. The hydration products are primarily ettringite and alumina gel, maximally eliminating the sulfate attack caused by the delayed setting of traditional ettringite. Furthermore, the micro-aggregate effect and secondary curing of slag and rice husk ash further refine the pore structure, compensating for the increased porosity and decreased compressive strength caused by later crystal transformation, thereby improving the density, bond strength, and impermeability of the concrete matrix. Additionally, sodium alginate derivatives and sodium acrylate are introduced into the composite gel system. When the pH value of the concrete decreases locally due to sulfuric acid attack, the sodium alginate derivative can dynamically release calcium ions and sulfate ions to form dihydrate gypsum, thereby increasing the system's density and mechanical properties. Moreover, the sodium alginate derivative can form a dynamic borate ester crosslinking system, dynamically adjusting the calcium ion concentration in response to pH changes, enhancing the long-term corrosion and impermeability resistance of the concrete matrix to corrosive media such as sulfuric acid and sulfates, and extending its service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the rate of change in the mass of concrete specimens in Examples 1-2, Control Groups 1-2, and the Blank Group of this application.

[0018] Figure 2 This is a schematic diagram showing the corrosion resistance coefficient data of concrete specimens in Examples 1-2 and Control Groups 1-2 of this application. Detailed Implementation

[0019] Based on extensive experimental research, this application provides a concrete comprising the following raw materials in parts by weight: 200-280 parts of sulfoaluminate cement, 70-90 parts of ordinary silicate cement, 100-135 parts of slag powder, 15-25 parts of gypsum, 20-50 parts of limestone powder, 650-780 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 30-65 parts of rice husk ash, 10-15 parts of sodium alginate derivative, 3-6.5 parts of sodium acrylate, 2-3.5 parts of polycarboxylate superplasticizer, 0.1-0.3 parts of defoamer, and 160-190 parts of water.

[0020] In some specific embodiments, the concrete comprises the following raw materials in parts by weight: 220 parts sulfoaluminate cement, 80 parts ordinary silicate cement, 120 parts slag powder, 20 parts gypsum, 35 parts limestone powder, 700 parts fine aggregate, 1150 parts coarse aggregate, 50 parts rice husk ash, 12 parts sodium alginate derivative, 5 parts sodium acrylate, 3 parts polycarboxylate superplasticizer, 0.2 parts defoamer, and 170 parts water. This method yields better experimental results.

[0021] Furthermore, the preparation method of the sodium alginate derivative includes the following steps: 1) Sodium alginate was prepared by reacting sodium alginate with 3-aminophenylboronic acid; 2) Dissolve polyvinyl alcohol in deionized water, adjust the pH to alkaline, add phenylboronic acid-grafted sodium alginate and mix well, then add calcium chloride solution, and after complexation, obtain the base solution; 3) Adjust the pH of the base solution to acidic, let it stand, then adjust the pH to alkaline, and then add the monosaccharide and Ca complex, and stir well to obtain the final product.

[0022] Furthermore, in step 2), the mass ratio of polyvinyl alcohol to phenylboronic acid-grafted sodium alginate is 1:(0.65-0.8).

[0023] In some specific embodiments, in step 2), the mass ratio of polyvinyl alcohol to phenylboronic acid-grafted sodium alginate can be 1:0.65, 1:0.66, 1:0.67, 1:0.68, 1:0.69, 1:0.70, 1:0.71, 1:0.72, 1:0.73, 1:0.74, 1:0.75, 1:0.76, 1:0.77, 1:0.78, 1:0.79, or 1:0.8. Generally, a mass ratio of 1:0.75 for polyvinyl alcohol to phenylboronic acid-grafted sodium alginate in step 2) yields better experimental results.

[0024] Furthermore, the average molecular weight of the polyvinyl alcohol is 20,000-150,000.

[0025] In some specific embodiments, the average molecular weight of the polyvinyl alcohol can be 20,000, 30,000, 35,000, 50,000, 100,000, or 150,000. Typically, an average molecular weight of 100,000 is obtained, which yields better results.

[0026] Furthermore, in step 3), the Ca complex is prepared by reacting a Schiff base ligand with calcium acetate.

[0027] Furthermore, the Schiff base ligand is prepared by condensation of salicylaldehyde and ethylenediamine.

[0028] Furthermore, in step 3), the monosaccharide is one of glucose, fructose, or galactose.

[0029] In some specific embodiments, when the monosaccharide in step 3) is glucose, better technical results can be achieved.

[0030] This application also provides a method for preparing concrete, comprising the following steps: S1: Weigh out sulfoaluminate cement, ordinary silicate cement, slag powder, gypsum, limestone powder, fine aggregate, coarse aggregate, and rice husk ash according to the proportion, and put them into a mixer to mix to obtain dry mix. S2: Take water, sodium acrylate, sodium alginate derivative, polycarboxylate superplasticizer, defoamer, and ammonium persulfate, mix them evenly, and then add the dry mix and wet mix to obtain the final product.

[0031] Furthermore, in step 2), the wet mixing time is 2-5 minutes.

[0032] This application also provides an on-site casting process, including the following steps: base treatment: clean the base layer and moisten the base surface with water until it is saturated and dry; formwork erection: erect the formwork according to the design requirements, ensuring tight joints, and apply a release agent; casting: pour the concrete in layers and vibrate each layer to ensure compaction; finishing and curing: after the concrete is poured and vibrated, finish the surface and then cover it for moisture curing; demolding and post-curing: after the concrete strength reaches the design requirements, remove the demolding and continue to cure with moisture until the specified age.

[0033] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0034] Example 1: The concrete in this example includes the following raw materials in parts by weight: 220 kg of CA-50 sulfoaluminate cement, 80 kg of PO42.5 ordinary Portland cement, 120 kg of S95 grade slag powder, 20 kg of gypsum, 35 kg of limestone powder, 700 kg of fine aggregate, 1150 kg of coarse aggregate, 50 kg of rice husk ash, 12 kg of sodium alginate derivative, 5 kg of sodium acrylate, 3 kg of polycarboxylate superplasticizer, 0.2 kg of defoamer, and 180 kg of water.

[0035] The gypsum is dihydrate gypsum with a specific surface area of ​​280 m². 2 / kg, purity 99%. The limestone powder has a fineness of 45μm. Fine aggregate is standard sand. Coarse aggregate is granite crushed stone with a particle size of 5-10mm and an apparent density of 2708kg / m³. 2 The specific surface area of ​​rice husk ash is 65 m². 2 / g, loss on ignition 5.5%.

[0036] The preparation method of the sodium alginate derivative in this embodiment includes the following steps: 1) Dissolve 5g sodium alginate and 1.95g 3-aminophenylboronic acid in 500mL of deionized water, add 4.9g EDC·HCl and mix well. Stir overnight at room temperature, dialyze and dry to obtain phenylboronic acid-grafted sodium alginate. 2) Dissolve 10g of polyvinyl alcohol-117 in 200mL of deionized water, adjust the pH to alkaline with 0.1M sodium hydroxide, add 7.5g of phenylboronic acid grafted sodium alginate and mix well, then add 10mL of 20% calcium chloride solution and complex to obtain the base solution. 3) Adjust the pH of the base solution to 6 with 0.1M hydrochloric acid solution, let it stand, adjust the pH to alkaline with ammonia water, add 2g of Ca complex and 0.15g of glucose, and stir well to obtain the final product.

[0037] The Ca complex in this embodiment was prepared by the following steps: 0.17 g gallic acid and 0.147 g calcium chloride were added to a beaker, followed by 5 mL LDM, 20 mL methanol and 10 mL chloroform. The mixture was stirred at room temperature for 30 min, then heated to 60 °C and stirred overnight. After cooling, filtering and drying, the product was obtained.

[0038] The concrete preparation method of this embodiment includes the following steps: S1: Weigh out sulfoaluminate cement, ordinary silicate cement, slag powder, gypsum, limestone powder, fine aggregate, coarse aggregate, and rice husk ash according to the proportion, and put them into a mixer to mix to obtain dry mix. S2: Take water, sodium acrylate, sodium alginate derivative, polycarboxylate superplasticizer, defoamer, and ammonium persulfate, mix them evenly, and then add the dry mixture and mix for 3.5 minutes to obtain the final product.

[0039] The on-site casting process in this embodiment includes the following steps: Base treatment: Clean the base layer and moisten the surface of the base layer with water until it is saturated and dry; Formwork erection: Erect the formwork according to the design requirements, ensuring tight joints and applying a release agent; Casting: Pour the above-mentioned concrete in layers and vibrate each layer to ensure compaction; Finishing and curing: After the concrete is poured and vibrated, finish the surface and then cover it for moisture curing; Demolding and post-curing: Demold the formwork after the concrete strength reaches the design requirements and continue to moist cure until the specified age.

[0040] Example 2: The concrete in this example includes the following raw materials in parts by weight: 220 kg of CA-50 sulfoaluminate cement, 80 kg of PO42.5 ordinary Portland cement, 120 kg of S95 grade slag powder, 20 kg of gypsum, 35 kg of limestone powder, 700 kg of fine aggregate, 1150 kg of coarse aggregate, 50 kg of rice husk ash, 12 kg of sodium alginate derivative, 5 kg of sodium acrylate, 3 kg of polycarboxylate superplasticizer, 0.2 kg of defoamer, and 180 kg of water.

[0041] The gypsum is dihydrate gypsum with a specific surface area of ​​280 m². 2 / kg, purity 99%. The limestone powder has a fineness of 45μm. Fine aggregate is standard sand. Coarse aggregate is granite crushed stone with a particle size of 5-10mm and an apparent density of 2708kg / m³. 2 The specific surface area of ​​rice husk ash is 65 m². 2 / g, loss on ignition 5.5%.

[0042] The preparation method of the sodium alginate derivative in this embodiment includes the following steps: 1) Dissolve 5g sodium alginate and 1.95g 3-aminophenylboronic acid in 500mL of deionized water, add 4.9g EDC·HCl and mix well. Stir overnight at room temperature, dialyze and dry to obtain phenylboronic acid-grafted sodium alginate. 2) Dissolve 10g of polyvinyl alcohol-117 in 200mL of deionized water, adjust the pH to alkaline with 0.1M sodium hydroxide, add 7.5g of phenylboronic acid grafted sodium alginate and mix well, then add 10mL of 20% calcium chloride solution and complex to obtain the base solution. 3) Adjust the pH of the base solution to 6 with 0.1M hydrochloric acid solution, let it stand, adjust the pH to alkaline with ammonia water, add 2g of Ca complex and 0.15g of glucose, and stir well to obtain the final product.

[0043] The Ca complex in this embodiment was prepared by the following steps: 20 mL of salicylaldehyde was added to a beaker, and then 6 mL of ethylenediamine was slowly added dropwise to obtain a yellow solid; 0.53 g of the obtained yellow solid was dissolved in 100 mL of ethanol solution (water:ethanol = 2:1), and then an anhydrous ethanol solution containing 0.316 g of calcium acetate was added. The mixture was heated to 70 °C and refluxed for 1 h. After cooling, filtration, and drying, the product was obtained.

[0044] The concrete preparation method of this embodiment includes the following steps: S1: Weigh out sulfoaluminate cement, ordinary silicate cement, slag powder, gypsum, limestone powder, fine aggregate, coarse aggregate, and rice husk ash according to the proportion, and put them into a mixer to mix to obtain dry mix. S2: Take water, sodium acrylate, sodium alginate derivative, polycarboxylate superplasticizer, defoamer, and ammonium persulfate, mix them evenly, and then add the dry mixture and mix for 3.5 minutes to obtain the final product.

[0045] The on-site casting process in this embodiment includes the following steps: Base treatment: Clean the base layer and moisten the surface of the base layer with water until it is saturated and dry; Formwork erection: Erect the formwork according to the design requirements, ensuring tight joints and applying a release agent; Casting: Pour the above-mentioned concrete in layers and vibrate each layer to ensure compaction; Finishing and curing: After the concrete is poured and vibrated, finish the surface and then cover it for moisture curing; Demolding and post-curing: Demold the formwork after the concrete strength reaches the design requirements and continue to moist cure until the specified age.

[0046] Control Group 1: The concrete in this control group consisted of the following raw materials by weight: 300 kg of PO42.5 ordinary Portland cement, 20 kg of gypsum, 35 kg of limestone powder, 700 kg of fine aggregate, 1150 kg of coarse aggregate, 50 kg of rice husk ash, 5 kg of sodium acrylate, 3 kg of polycarboxylate superplasticizer, 0.2 kg of defoamer, and 180 kg of water.

[0047] The gypsum is dihydrate gypsum with a specific surface area of ​​280 m².2 / kg, purity 99%. The limestone powder has a fineness of 45μm. Fine aggregate is standard sand. Coarse aggregate is granite crushed stone with a particle size of 5-10mm and an apparent density of 2708kg / m³. 2 The specific surface area of ​​rice husk ash is 65 m². 2 / g, loss on ignition 5.5%.

[0048] The concrete preparation method for this control group includes the following steps: S1: Weigh out ordinary Portland cement, gypsum, limestone powder, fine aggregate, coarse aggregate, and rice husk ash according to the proportion, and put them into a mixer to mix and obtain dry mix; S2: Take water, sodium acrylate, polycarboxylate superplasticizer, defoamer, and ammonium persulfate, mix them evenly, and then add the dry mix and mix for 3.5 minutes to obtain the final product.

[0049] The on-site pouring process of this control group includes the following steps: Base treatment: Clean the base layer and moisten the surface with water until it is saturated and dry; Formwork erection: Erect the formwork according to the design requirements, ensuring tight joints and applying a release agent; Pouring: Pour the concrete in layers and vibrate each layer to ensure compaction; Finishing and curing: After the concrete is poured and vibrated, finish the surface and then cover it for moisture curing; Demolding and post-curing: Demold the concrete after it reaches the design strength and continue to cure it for the specified age.

[0050] Control Group 2: The concrete in this control group consisted of the following raw materials by weight: 220 kg of CA-50 sulfoaluminate cement, 80 kg of PO42.5 ordinary Portland cement, 120 kg of S95 grade slag powder, 20 kg of gypsum, 35 kg of limestone powder, 700 kg of fine aggregate, 1150 kg of coarse aggregate, 50 kg of rice husk ash, 12 kg of sodium alginate derivative, 5 kg of sodium acrylate, 3 kg of polycarboxylate superplasticizer, 0.2 kg of defoamer, and 180 kg of water.

[0051] The gypsum is dihydrate gypsum with a specific surface area of ​​280 m². 2 / kg, purity 99%. The limestone powder has a fineness of 45μm. Fine aggregate is standard sand. Coarse aggregate is granite crushed stone with a particle size of 5-10mm and an apparent density of 2708kg / m³. 2 The specific surface area of ​​rice husk ash is 65 m². 2 / g, loss on ignition 5.5%.

[0052] The preparation method of the sodium alginate derivative in this control group includes the following steps: 1) Dissolve 5g sodium alginate and 1.95g 3-aminophenylboronic acid in 500mL of deionized water, add 4.9g EDC·HCl and mix well. Stir overnight at room temperature, dialyze and dry to obtain phenylboronic acid-grafted sodium alginate. 2) Dissolve 10g of polyvinyl alcohol-117 in 200mL of deionized water, adjust the pH to alkaline with 0.1M sodium hydroxide, add 7.5g of phenylboronic acid grafted sodium alginate and mix well, then add 10mL of 20% calcium chloride solution and complex to obtain the base solution. 3) Adjust the pH of the base solution to 6 with 0.1M hydrochloric acid solution, then adjust the pH to alkaline with ammonia water, and stir well to obtain the final product.

[0053] The concrete preparation method for this control group includes the following steps: S1: Weigh out sulfoaluminate cement, ordinary silicate cement, slag powder, gypsum, limestone powder, fine aggregate, coarse aggregate, and rice husk ash according to the proportion, and put them into a mixer to mix to obtain dry mix. S2: Take water, sodium acrylate, sodium alginate derivative, polycarboxylate superplasticizer, defoamer, and ammonium persulfate, mix them evenly, and then add the dry mixture and mix for 3.5 minutes to obtain the final product.

[0054] The on-site pouring process of this control group includes the following steps: Base treatment: Clean the base layer and moisten the surface with water until it is saturated and dry; Formwork erection: Erect the formwork according to the design requirements, ensuring tight joints and applying a release agent; Pouring: Pour the concrete in layers and vibrate each layer to ensure compaction; Finishing and curing: After the concrete is poured and vibrated, finish the surface and then cover it for moisture curing; Demolding and post-curing: Demold the concrete after it reaches the design strength and continue to cure it for the specified age.

[0055] Performance Testing: 1. Concrete samples from Examples 1-2 and Control Groups 1-2 were poured into molds and compacted on a vibrating table to form 40mm×40mm×40mm cubic specimens. After standard curing for 24 hours, the specimens were demolded and cured for another 7 days, followed by drying at 45℃ for 6 hours before use. A simulated corrosion solution with a pH of 3 was prepared using 98% concentrated sulfuric acid and deionized water. The specimens were then immersed in the simulated corrosion solution for 6 months, with concentrated sulfuric acid added as needed to maintain a stable pH. The corrosion solution was replaced every 20 days. The mass of the specimens was tested for different immersion times. The specimens were wiped and dried before each test. A blank control group was also set up, using deionized water as the immersion solution. The mass change rate of the specimen = M X -M0 / M0×100%, where M X M0 represents the mass of the specimen after immersion in the simulated corrosion solution for X days, and M0 represents the mass of the specimen before immersion. Specific test results are as follows: Figure 1 As shown.

[0056] 2. Take concrete specimens from Examples 1-2 and Control Groups 1-2, and test their compressive strength for different soaking times according to GB / T 17671-2021. Calculate the corrosion resistance coefficient of the specimens. Corrosion resistance coefficient = S X / KX S X K represents the compressive strength of the specimen after immersion in a simulated corrosive solution for X days. X The compressive strength of the blank group specimens after immersion in deionized water for X days is given in the following test results. Figure 2 As shown.

[0057] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A type of concrete, characterized in that: The raw materials include the following parts by weight: 200-280 parts of sulfoaluminate cement, 70-90 parts of ordinary silicate cement, 100-135 parts of slag powder, 15-25 parts of gypsum, 20-50 parts of limestone powder, 650-780 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 30-65 parts of rice husk ash, 10-15 parts of sodium alginate derivative, 3-6.5 parts of sodium acrylate, 2-3.5 parts of polycarboxylate superplasticizer, 0.1-0.3 parts of defoamer, and 160-190 parts of water. The preparation method of the sodium alginate derivative includes the following steps: 1) Sodium alginate was prepared by reacting sodium alginate with 3-aminophenylboronic acid; 2) Dissolve polyvinyl alcohol in deionized water, adjust the pH to alkaline, add phenylboronic acid-grafted sodium alginate and mix well, then add calcium chloride solution, and after complexation, obtain the base solution; 3) Adjust the pH of the base solution to acidic, let it stand, then adjust the pH to alkaline, and then add the monosaccharide and Ca complex, and stir evenly to obtain the solution; the Ca complex is prepared by Schiff base ligand and calcium acetate; the Schiff base ligand is prepared by condensation of salicylaldehyde and ethylenediamine.

2. The concrete according to claim 1, characterized in that: In step 2), the mass ratio of polyvinyl alcohol to phenylboronic acid-grafted sodium alginate is 1:(0.65-0.8).

3. The concrete according to claim 2, characterized in that: The average molecular weight of the polyvinyl alcohol is 20,000-150,000.

4. The concrete according to claim 1, characterized in that: In step 3), the monosaccharide is one of glucose, fructose, or galactose.

5. A method for preparing concrete as described in claim 1, characterized in that: Includes the following steps: S1: Weigh out sulfoaluminate cement, ordinary silicate cement, slag powder, gypsum, limestone powder, fine aggregate, coarse aggregate, and rice husk ash according to the proportion, and put them into a mixer to mix to obtain dry mix. S2: Take water, sodium acrylate, sodium alginate derivative, polycarboxylate superplasticizer, defoamer, and ammonium persulfate, mix them evenly, and then add the dry mix and wet mix to obtain the final product.

6. The method for preparing concrete according to claim 5, characterized in that: In step 2), the wet mixing time is 2-5 minutes.

7. A cast-in-place process, characterized in that: The steps include: Base treatment: Clean the base layer and moisten the surface with water until it is saturated and dry; Formwork erection: Erect the formwork according to the design requirements, ensuring tight joints and applying a release agent; Pouring: The concrete as described in claim 1 is poured in layers and compacted by vibration in each layer; Finishing and curing: After the concrete is poured and vibrated, the surface is finished and then covered for moisture curing; Demolding and post-curing: After the concrete strength reaches the design requirements, the formwork is removed and moisture curing continues until the specified age.

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