Carbon sequestration concrete material based on masson pine epidemic wood and preparation method of carbon sequestration concrete material

Abstract

The invention discloses a carbon sequestration concrete material based on masson pine epidemic wood and a preparation method thereof, and belongs to the technical field of carbon sequestration concretes.The carbon sequestration concrete material is prepared from masson pine epidemic wood, bamboo fibers, magnesium oxide, magnesium chloride, fly ash, xylinic acid, disodium hydrogen phosphate, sodium lauroyl isethionate and octadecyl dimethyl betaine; pinus massoniana epidemic wood is crushed and then mixed with other raw materials, then magnesium oxide and magnesium chloride are adopted as adhesives to prepare the carbon sequestration concrete material, high-quality utilization of the Pinus massoniana epidemic wood resources is greatly improved, and the carbon sequestration concrete material prepared according to the method is high in strength, good in efflorescence and scumming resistance, not prone to cracking and suitable for large-scale production. Good application prospects are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fixation concrete materials, and particularly relates to a carbon fixation concrete material based on Pinus massoniana blight wood and a preparation method thereof. BACKGROUND

[0002] The pine wood nematode disease is called the "cancer" of pine trees, and is a devastating disease of pine trees, which has the characteristics of fast transmission, difficult prevention and control, and serious harm. Once the Pinus massoniana is infected, it will die rapidly, which seriously threatens the safety of the local forest ecosystem. At present, these blight woods are mainly treated by incineration, which greatly causes resource waste and a large amount of carbon emissions.

[0003] At present, the preparation of building carbon fixation concrete materials from forestry waste is an effective way to high-quality utilization of forestry resources, and also realizes the fixation and storage of biological carbon. Therefore, the Pinus massoniana blight wood is made into a carbon fixation concrete material for road paving, highway slope protection and the like, which has a good application prospect. When the carbon fixation concrete material is prepared from forestry waste, an adhesive needs to be added. The magnesium-based inorganic adhesive with magnesium oxide and magnesium chloride as main raw materials has the characteristics of rich raw material resources, low price, fast hardening speed, high concrete strength and good flame retardancy, and has been widely used in the building material industry. However, when the inorganic magnesium-based adhesive with magnesium oxide and magnesium chloride as raw materials is used for adhesive curing to prepare the carbon fixation concrete material, the product is prone to halogen return and frosting, which not only destroys the surface aesthetics of the material, but also reduces the strength of the product and shortens the service life, especially in the high-temperature and high-humidity environment in the south.

[0004] Therefore, at present, it is necessary to find a preparation method of carbon fixation concrete material to solve the problem that the carbon fixation concrete material prepared by using magnesium oxide and magnesium chloride as adhesive is prone to halogen return and frosting in a high-temperature and high-humidity environment, which leads to reduced aesthetics and shortened service life. SUMMARY

[0005] In view of this, the purpose of the present application is to provide a carbon fixation concrete material based on Pinus massoniana blight wood and a preparation method thereof, which solves the problem that the carbon fixation concrete material prepared by using magnesium oxide and magnesium chloride as adhesive is prone to halogen return and frosting in a high-temperature and high-humidity environment, which leads to reduced aesthetics and shortened service life.

[0006] The present application solves the above technical problems through the following technical means:

[0007] Pinus massoniana blight wood, bamboo fiber, magnesium oxide, magnesium chloride, fly ash, wood wax acid, disodium hydrogen phosphate, octadecyl dimethyl betaine, and sodium lauroyl methyl isethionate.

[0008] Further, the content of active magnesium oxide in the magnesium oxide is greater than or equal to 85%.

[0009] The application further discloses a preparation method of the carbon fixation concrete material.

[0010] (1) wood wax acid is heated to 90 DEG C and stirred to be dissolved, then sodium phosphate dibasic, octadecyl dimethyl betaine are added and uniformly mixed, then the mixture is naturally cooled to room temperature and ground to 100 mesh to obtain sodium phosphate dibasic composite particles;

[0011] (2) bamboo fibers are soaked in a 20-30wt% magnesium chloride solution for 10-30min, taken out and drained to obtain pretreated bamboo fibers; pine wood material is collected and crushed to a particle size of 1-6mm, then 300mg / L abamectin is sprayed for disinfection treatment, the pine wood material is soaked in a 40-50wt% magnesium chloride solution for 20-40min after disinfection, taken out and drained to obtain pretreated pine wood material, and the pretreated pine wood material is mixed with the pretreated bamboo fibers to obtain a crushed material;

[0012] (3) the crushed material is dispersed in water and heated to 80-90 DEG C for 1-2h, then cooled to 40-60 DEG C, sodium lauryl isethionate is added, the pH is adjusted to 7.5-8.5, and the mixture is continuously stirred at a speed of 200-300rpm for 2-4h, then the mixture is naturally cooled to room temperature, the filtrate is removed by filtration, the mixture is washed with water for 2-3 times, then sodium phosphate dibasic composite particles and fly ash are fully stirred and mixed, magnesium oxide and magnesium chloride are added and uniformly mixed to obtain a mixed solid material, water is added to the mixed solid material and continuously stirred for 2-3min, then the mixture is poured into a mold, the mold is covered with plastic film after 4h, the surface is kept wet, and the mixture is cured at room temperature to obtain the carbon fixation concrete material.

[0013] The pine wood material is used as a preparation raw material of the carbon fixation concrete, so that the raw material cost of the carbon fixation concrete is greatly reduced, the problem of harmless utilization of the pine wood material of the pine wood nematode disease is solved, the utilization rate of the waste resources is improved, the bamboo fibers which are rich in resources and have high fiber strength are added, the network structure of the bamboo fibers is used to effectively enhance the bending strength of the carbon fixation concrete, and the carbon fixation concrete material with good performance is obtained.

[0014] Further, the mass ratio of the wood wax acid, the sodium phosphate dibasic and the octadecyl dimethyl betaine in the step (1) is (1.6-2):(0.5-0.7):(0.1-0.2).

[0015] Further, the mass ratio of the pretreated pine wood material and the pretreated bamboo fibers in the step (2) is (25-35):(6-7).

[0016] Further, the mass ratio of the pulverized material, sodium lauryl sulfate, disodium hydrogen phosphate composite particles, fly ash, magnesium oxide and magnesium chloride in step (3) is (30-40):(0.2-0.3):(2.1-2.8):(15-20):(25-35):(6-10).

[0017] Further, the water added in the mixing of the solid materials in step (3) is 35-45% of the mass of the mixed solid materials.

[0018] Further, the water added in the mixing of the solid materials in step (3) needs to be adjusted to a pH of 8.

[0019] Further, the curing time under normal temperature conditions in step (3) is 7-15 days.

[0020] The concrete product prepared by using magnesium oxide and magnesium chloride as the adhesive is prone to have the problem of halogen return and efflorescence, which is due to the existence of free magnesium chloride in the product, and the magnesium chloride has great water solubility and hygroscopicity, and in a high-humidity environment, the magnesium chloride will migrate to the surface from the capillary pores in the product along with water evaporation, and form white spots on the surface of the product to cause the problem of halogen return and efflorescence, which not only affects the aesthetic appearance, but also gradually leads to the destruction of the structure of the product in the long run. Therefore, the present application adds disodium hydrogen phosphate to co-preparation of the carbon fixation concrete material, and the disodium hydrogen phosphate can combine with the free magnesium chloride to generate insoluble substances, so as to prevent the migration of the internal free magnesium chloride to the surface to cause the phenomenon of halogen return and efflorescence. However, in actual production, when the addition amount of the disodium hydrogen phosphate is too small, the improvement degree of the anti-halogen return and efflorescence performance of the product is not high; when the addition amount is too large, the disodium hydrogen phosphate will have a side reaction with the hydration product formed by the magnesium oxide and the magnesium chloride, which affects the normal generation of the hydration product, destroys the continuity of the cementitious structure, and further leads to the decrease of the strength of the carbon fixation concrete product.

[0021] Based on the above technical problems, the present application adopts wood wax acid to embed disodium hydrogen phosphate to prepare disodium hydrogen phosphate composite particles, and then adds to jointly prepare carbon fixation concrete material, which can ensure that disodium hydrogen phosphate and free magnesium chloride are combined efficiently to inhibit the occurrence of halogen return and efflorescence, and at the same time ensure the strength of the carbon fixation concrete material. This is because the disodium hydrogen phosphate composite particles are added to the mixed solid material, and after adding water, the magnesium chloride and magnesium oxide in the mixed solid material are hydrated to generate 5·1·8 phase crystals, which interweave to form a dense network structure, thereby obtaining a hard carbon fixation concrete material. When magnesium oxide and magnesium chloride are hydrated to generate 5·1·8 phase crystals, a large amount of heat is released. At this time, the wood wax acid in the disodium hydrogen phosphate composite particles will not melt and release disodium hydrogen phosphate until the internal temperature rises to a high degree due to the released heat, thereby inhibiting the premature side reaction of disodium hydrogen phosphate with hydration products and the like, thereby ensuring the normal growth of the hydration products and the strength of the solid concrete material. Disodium hydrogen phosphate is not released until later, and then reacts with unreacted free magnesium chloride to form a difficultly soluble substance, thereby ensuring the fixation of disodium hydrogen phosphate on free magnesium chloride and inhibiting the occurrence of halogen return and efflorescence. At the same time, the melting of wood wax acid also absorbs heat, thereby reducing the internal thermal expansion pressure, preventing cracks and deformation of the product, and better ensuring the strength of the product.

[0022] Further, the melted wood wax acid is distributed in the interior of the carbon fixation concrete material, which can effectively reduce the hydrophilicity in the interior of the carbon fixation concrete material, inhibit the absorption of water by free magnesium chloride in the carbon fixation concrete in a high humidity environment, and inhibit the dissolution and migration of free magnesium chloride to the surface with water; at the same time, octadecyl dimethyl betaine is also added during the preparation of the disodium hydrogen phosphate composite particles, and the hydrophobic end of the octadecyl dimethyl betaine combines with the wood wax acid and is dispersed in the carbon fixation concrete with the melted wood wax acid, wherein the cationic group can adsorb chloride ions in free magnesium chloride, thereby inhibiting the migration of chloride ions to the surface of the carbon fixation concrete, and through the combined action of the components in the disodium hydrogen phosphate composite particles, the occurrence of halogen return and efflorescence is efficiently inhibited.

[0023] In addition, the present application also uses sodium lauroyl methyl isethionate to treat the crushed material, and the sodium lauroyl methyl isethionate is combined into the crushed material to enhance the adsorption and fixation of magnesium ions in free magnesium chloride, thereby further inhibiting the migration of free magnesium chloride and improving the anti-halogen return and efflorescence performance of the product. In addition, the sodium lauroyl methyl isethionate can also hydrophobically associate with the wood wax acid in the disodium hydrogen phosphate composite particles, stably exist in the carbon fixation concrete product, and continuously play a role in adsorbing and fixing free magnesium chloride, thereby ensuring the anti-halogen return and efflorescence performance of the carbon fixation concrete in a high temperature and high humidity environment, and ensuring the aesthetic appearance and long-term performance of the product.

[0024] Advantages:

[0025] 1. The present application uses Masson's pine blight as a raw material for treatment, and then uses it together with magnesium chloride, magnesium oxide, fly ash and the like to prepare a carbon fixation concrete material, thereby promoting the high-quality utilization of Masson's pine blight waste resources.

[0026] 2. The application is prepared by embedding sodium hydrogen phosphate mixed with wood acid during the preparation of carbon fixation concrete material, and pretreating plant raw materials with sodium lauryl isethionate, which effectively improves the anti-efflorescence and frost resistance of carbon fixation concrete material, ensures its strength, and has good application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 : is a picture of carbon fixation concrete prepared according to Example 1 of the application;

[0028] Figure 2 : is a picture of the paving application of carbon fixation concrete prepared according to the method of Example 3 of the application. DETAILED DESCRIPTION

[0029] The application will be described in detail below with reference to specific examples:

[0030] Example 1: Preparation of carbon fixation concrete

[0031] (1) 1.8 kg of wood acid was heated to 90℃ and stirred to dissolve, then 0.6 kg of sodium hydrogen phosphate, 0.15 kg of octadecyl dimethyl betaine were added and mixed uniformly, then naturally cooled to room temperature, and then ground through a 100 mesh sieve to obtain sodium hydrogen phosphate composite particles;

[0032] (2) The bamboo fibers were soaked in a 25wt% magnesium chloride solution for 20 min, then taken out and drained to obtain pretreated bamboo fibers; the Pinus massoniana blight was collected and crushed to a particle size of about 4 mm, then 300 mg / L abamectin was sprayed for disinfection treatment, and after disinfection, the pretreated Pinus massoniana material was soaked in a 45wt% magnesium chloride solution for 30 min, then taken out and drained to obtain pretreated Pinus massoniana material; 6 kg of pretreated bamboo fibers were added to 30 kg of pretreated Pinus massoniana material and mixed uniformly to obtain a crushed material;

[0033] (3) 35 kg of crushed material was placed in 35 kg of water and stirred and dispersed, then heated to 85℃ and treated for 1.5 h, then cooled to 50℃, 0.25 kg of sodium lauryl isethionate was added, the pH was adjusted to 8, and the reaction was continuously stirred at a speed of 250 rpm for 3 h, then naturally cooled to room temperature, the filtrate was removed by filtration, then washed with clean water for 3 times, then 2.5 kg of sodium hydrogen phosphate composite particles and 17 kg of fly ash were added and stirred and mixed uniformly, then 30 kg of magnesium oxide and 8 kg of magnesium chloride were added and mixed uniformly to obtain a mixed solid material, 40% of water of the mass of the mixed solid material was taken, the pH was adjusted to 8, then added to the mixed solid material, continuously stirred for 2 min, then poured into a mold, covered with plastic film on the surface to keep the surface moist, and cured at room temperature for 12 days to obtain a carbon fixation concrete material.

[0034] Example 2: Carbon sequestration concrete preparation two

[0035] (1) 1.6 kg of wood wax acid was heated to 90°C and stirred to dissolve, then 0.5 kg of disodium hydrogen phosphate, 0.1 kg of octadecyl dimethyl betaine were mixed uniformly, and then naturally cooled to room temperature, then ground through a 100 mesh sieve to obtain disodium hydrogen phosphate composite particles;

[0036] (2) The bamboo fibers were soaked in a 20wt% magnesium chloride solution for 30 min, then taken out and drained to obtain pretreated bamboo fibers; The pine wood was collected and crushed to a particle size of about 4 mm, then sprayed with 300 mg / L abamectin for disinfection treatment, and after disinfection, it was soaked in a 40wt% magnesium chloride solution for 40 min, then taken out and drained to obtain pretreated pine material, 6 kg of pretreated bamboo fibers were added to 25 kg of pretreated pine material and mixed uniformly to obtain a crushed material;

[0037] (3) 30 kg of crushed material was placed in 30 kg of water and stirred to disperse, then heated to 80°C and kept for 2 h, then cooled to 40°C, 0.2 kg of sodium lauryl glycolate was added, the pH was adjusted to 7.5, and the stirring was continued at a speed of 200 rpm for 4 h, then naturally cooled to room temperature, filtered to remove the filtrate, then washed with water for 2 times, then 2.1 kg of disodium hydrogen phosphate composite particles, 15 kg of fly ash were added and stirred to mix uniformly, then 25 kg of magnesium oxide and 6 kg of magnesium chloride were added and mixed uniformly to obtain a mixed solid material, 35% of water of the mass of the mixed solid material was taken, the pH was adjusted to 8 and added to the mixed solid material, stirred for 2 min, then poured into a mold, and after 4 h of molding, the surface was covered with plastic film to keep the surface moist, and cured at room temperature for 12 days to obtain a carbon sequestration concrete material.

[0038] Example 3: Carbon sequestration concrete preparation three

[0039] (1) 2 kg of wood wax acid was heated to 90°C and stirred to dissolve, then 0.7 kg of disodium hydrogen phosphate, 0.2 kg of octadecyl dimethyl betaine were mixed uniformly, and then naturally cooled to room temperature, then ground through a 100 mesh sieve to obtain disodium hydrogen phosphate composite particles;

[0040] (2) The bamboo fibers were soaked in a 30wt% magnesium chloride solution for 10 min, then taken out and drained to obtain pretreated bamboo fibers; The pine wood was collected and crushed to a particle size of about 4 mm, then sprayed with 300 mg / L abamectin for disinfection treatment, and after disinfection, it was soaked in a 50wt% magnesium chloride solution for 20 min, then taken out and drained to obtain pretreated pine material, 7 kg of pretreated bamboo fibers were added to 35 kg of pretreated pine material and mixed uniformly to obtain a crushed material;

[0041] (3) 40 kg of the crushed material was put into 40 kg of water and stirred and dispersed, then heated to 90°C and treated for 1 h, then cooled to 60°C, and then 0.3 kg of sodium lauryl isethionate was added, the pH was adjusted to 8.5, and then stirred at a speed of 300 rpm for 2 h. After the reaction was completed, it was naturally cooled to room temperature, the filtrate was removed by filtration, then washed with clean water for 3 times, then 2.8 kg of disodium hydrogen phosphate composite particles, 20 kg of fly ash were added and stirred and mixed uniformly, then 35 kg of magnesium oxide and 10 kg of magnesium chloride were added and mixed uniformly to obtain a mixed solid material, 45% of water of the mass of the mixed solid material was taken, the pH was adjusted to 8, and then added into the mixed solid material, and stirred for 3 min, then poured into a mold, and after 4 h of molding, the surface was covered with a plastic film to keep the surface moist, and cured at room temperature for 15 days to obtain a carbon fixation concrete material.

[0042] Comparative Example 1: Preparation of a carbon fixation concrete

[0043] In comparison with Example 1, the only difference is that no lignoceric acid is added in the preparation of the carbon fixation concrete in Comparative Example 1, and the specific process is as follows:

[0044] (1) The same as step (2) of Example 1;

[0045] (2) 35 kg of the crushed material was put into 35 kg of water and stirred and dispersed, then heated to 85°C and treated for 1.5 h, then cooled to 50°C, and then 0.25 kg of sodium lauryl isethionate was added, the pH was adjusted to 8, and then stirred at a speed of 250 rpm for 3 h. After the reaction was completed, it was naturally cooled to room temperature, the filtrate was removed by filtration, then washed with clean water for 3 times, then 0.6 kg of disodium hydrogen phosphate, 0.15 kg of octadecyl dimethyl betaine, and 17 kg of fly ash were added and stirred and mixed uniformly, then 30 kg of magnesium oxide and 8 kg of magnesium chloride were added and mixed uniformly to obtain a mixed solid material, 40% of water of the mass of the mixed solid material was taken, the pH was adjusted to 8, and then added into the mixed solid material, and stirred for 2 min, then poured into a mold, and after 4 h of molding, the surface was covered with a plastic film to keep the surface moist, and cured at room temperature for 12 days to obtain a carbon fixation concrete material.

[0046] Comparative Example 2: Preparation of a carbon fixation concrete

[0047] In comparison with Example 1, the only difference is that no octadecyl dimethyl betaine is added in step (1) in the preparation of the carbon fixation concrete in Comparative Example 2, and the remaining steps are the same as those of Example 1.

[0048] Comparative Example 3: Preparation of a carbon fixation concrete

[0049] In comparison with Example 1, the only difference is that no sodium lauryl isethionate is added in step (3) in the preparation of the carbon fixation concrete in Comparative Example 3, and the specific process is as follows:

[0050] (1)-(2) are the same as Example 1;

[0051] (3) 35 kg of the crushed material is put into 35 kg of water and stirred to disperse, and then heated to 85°C for 1.5 h of holding treatment. After natural cooling to room temperature, the filtrate is removed by filtration. 2.5 kg of disodium hydrogen phosphate composite particles and 17 kg of fly ash are added and fully stirred and mixed uniformly. Then 30 kg of magnesium oxide and 8 kg of magnesium chloride are added and mixed uniformly to obtain a mixed solid material. 40% of water of the mass of the mixed solid material is taken, and the pH is adjusted to 8 before being added to the mixed solid material. After continuous stirring for 2 min, it is injected into a mold. After 4 h of injection molding, the surface is covered with a plastic film to keep the surface moist, and cured at room temperature for 12 days to obtain a carbon fixation concrete material.

[0052] Comparative Example 4: Preparation of a carbon fixation concrete

[0053] In contrast to Example 1, the only difference is that in Comparative Example 4, instead of using lignoceric acid in step (1) during the preparation of the carbon fixation concrete, stearic acid is used, as shown below:

[0054] (1) 1.8 kg of stearic acid is heated to 90°C and stirred to dissolve, and then 0.6 kg of disodium hydrogen phosphate, 0.15 kg of octadecyl dimethyl betaine are added and mixed uniformly. Then it is naturally cooled to room temperature and ground through a 100 mesh sieve to obtain disodium hydrogen phosphate composite particles;

[0055] (2)-(3) are the same as Example 1.

[0056] Comparative Example 5: Preparation of a carbon fixation concrete

[0057] In contrast to Example 1, the only difference is that in Comparative Example 5, instead of using a magnesium chloride solution to treat the bamboo fibers and the masson pine in step (2) during the preparation of the carbon fixation concrete, they are directly placed in water for treatment, as shown below:

[0058] (1) is the same as Example 1;

[0059] (2) The bamboo fibers are put into water and soaked for 20 min, then taken out and drained to obtain pretreated bamboo fibers. The masson pine is collected and broken to a particle size of about 4 mm, and then sprayed with 300 mg / L of abamectin for disinfection treatment. After disinfection is completed, the pretreated masson pine material is put into water and soaked for 30 min, then taken out and drained to obtain pretreated masson pine material. 6 kg of pretreated bamboo fibers are added to 30 kg of pretreated masson pine material and mixed uniformly to obtain crushed material;

[0060] (3) is the same as Example 1.

[0061] Comparative Example 6: Preparation of a carbon fixation concrete

[0062] In comparison with Example 1, the only difference is that in Comparative Example 6, water is added in step (3) to adjust the pH to 9, and the other steps are the same as those in Example 1.

[0063] Preparation of carbon sequestration concrete

[0064] In comparison with Example 1, the only difference is that in Comparative Example 7, water is added in step (3) without adjusting the pH, and the other steps are the same as those in Example 1.

[0065] Preparation of carbon sequestration concrete

[0066] In comparison with Example 1, the only difference is that in Comparative Example 8, no bamboo fibers are added, and the details are as follows:

[0067] (1) The same as Example 1;

[0068] (2) The Pinus massoniana epidemic wood is collected and crushed to a particle size of about 4 mm, then sprayed with 300 mg / L abamectin for disinfection treatment, and after disinfection, soaked in a 45 wt% magnesium chloride solution for 30 min, then taken out and drained to obtain the crushed material;

[0069] (3) The same as Example 1.

[0070] Preparation of carbon sequestration concrete

[0071] In comparison with Example 1, the only difference is that in Comparative Example 9, instead of embedding with lignoceric acid, disodium hydrogen phosphate and octadecyl dimethyl betaine, they are directly added, and the details are as follows:

[0072] (1) The same as step (2) of Example 1;

[0073] (2) 35 kg of crushed material is placed in 35 kg of water and stirred to disperse, then heated to 85°C for 1.5 h of heat treatment, then cooled to 50°C, then 0.25 kg of sodium lauryl isethionate is added, the pH is adjusted to 8, and the stirring reaction is continued at a speed of 250 rpm for 3 h, then naturally cooled to room temperature, the filtrate is removed by filtration, then washed with clean water for 3 times, then 1.8 kg of lignoceric acid, 0.6 kg of disodium hydrogen phosphate, 0.15 kg of octadecyl dimethyl betaine and 17 kg of fly ash are added and stirred to mix evenly, then 30 kg of magnesium oxide and 8 kg of magnesium chloride are added and mixed evenly to obtain a mixed solid material, then 40% of water of the mass of the mixed solid material is taken, the pH is adjusted to 8, then added to the mixed solid material, continuously stirred for 2 min, then poured into a mold, the mold is kept for 4 h, the surface is covered with a plastic film to keep the surface wet, and cured at room temperature for 12 days to obtain a carbon sequestration concrete material

[0074] Preparation of carbon sequestration concrete

[0075] In contrast to Example 1, the difference is that the carbon fixation concrete in Comparative Example 10 is prepared according to a conventional method, as shown below:

[0076] (1) Collect the Pinus massoniana epidemic wood and crush to a particle size of about 4 mm, then spray 300 mg / L abamectin for disinfection treatment, after disinfection, soak in water for 30 min, then drain to get the crushed material;

[0077] (2) Put 35 kg of crushed material into 35 kg of water, stir and disperse, then heat to 85℃ and keep for 1.5 h, naturally cool to room temperature, then filter to remove the filtrate, then add 0.6 kg of disodium hydrogen phosphate, 17 kg of fly ash, mix well, then add 30 kg of magnesium oxide and 8 kg of magnesium chloride, mix well to get a mixed solid material, take 40% of the mass of the mixed solid material, adjust the pH to 8, then add to the mixed solid material, continue to stir for 2 min, then pour into a mold, keep the surface covered with plastic film for 4 h to keep the surface wet, and keep at room temperature for 12 days to get the carbon fixation concrete material.

[0078] Experiment: Carbon fixation concrete performance detection experiment

[0079] The performance of the carbon fixation concrete prepared in Example 1 and Comparative Examples 1-10 is detected, including flexural strength (tested according to GB / T28635-2012 standard), salt spray resistance (300 h salt spray test, tested according to GB / T1771-2007 standard), and halogen return phenomenon. Specifically, the product is placed in a condition of humidity of 60% and temperature of 30℃, and the halogen return phenomenon is observed. According to the size of the average halogen return area, it is divided into 5 grades, the average halogen return area of more than 50% is classified as V grade, the average halogen return area of 35-50% is classified as IV grade, the average halogen return area of 18-35% is classified as III grade, the average halogen return area of 8-18% is classified as II grade, and the average halogen return area of less than 8% is classified as I grade. The results are shown in Table 1.

[0080] Table 1

[0081] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Compressive strength (Mpa) 29.3 27.2 28.3 28.5 27.9 28.8 28.4 28.1 26.0 28.2 24.4 Flexural strength (Mpa) 4.11 3.72 3.94 3.95 3.83 3.96 3.92 3.86 3.54 3.82 3.06 Salt spray resistance No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage No corrosion and no breakage Rehalogenation phenomenon Class I Class III Class II Class II Class I Class I Class II Class I Class II Class I Class IV

[0082] According to the data analysis of Table 1, it can be known that:

[0083] (1) The carbon fixation concrete prepared according to the method of the present application has high strength and good halogen return resistance, and has good application prospect.

[0084] (2) The carbon sequestration concrete in Comparative Example 1 is prepared without adding lignoceric acid, which leads to the premature side reaction of sodium dihydrogen phosphate and affects the formation of crystals, resulting in a lower strength of the carbon sequestration concrete product, poor hydrophobicity in the product, easy absorption of water, strong migration of free magnesium chloride, and serious halogen return and efflorescence. The carbon sequestration concrete in Comparative Example 2 is prepared without adding octadecyl dimethyl betaine, which fails to promote the absorption of chloride ions in free magnesium chloride in the carbon sequestration concrete, resulting in increased halogen return. The carbon sequestration concrete in Comparative Example 3 is prepared without adding sodium lauroyl methyl isethionate, which fails to promote the absorption of magnesium ions in beneficial magnesium chloride in the carbon sequestration concrete, resulting in increased halogen return.

[0085] (3) The carbon sequestration concrete in Comparative Example 4 is prepared without using lignoceric acid but using stearic acid, which has a low melting point and melts at a low temperature in the early stage to release sodium hydrogen phosphate, affecting the formation of crystal structures. The carbon sequestration concrete in Comparative Example 5 is prepared without using a magnesium chloride solution to treat bamboo fibers and masson pine, but directly putting them into water for treatment, which leads to poor dispersibility of magnesium chloride in the crushed particles and affects the hydration reaction, resulting in a reduced strength of the product. The carbon sequestration concrete in Comparative Example 6 is prepared by adjusting the pH of water to 9, which affects the formation of crystal structures and reduces the stability of the crystal structures, resulting in a reduced strength of the product. The carbon sequestration concrete in Comparative Example 7 is prepared without adjusting the pH, using conventional water, and the neutral environment fails to promote the formation of crystals, resulting in a poor strength of the carbon sequestration concrete product. The carbon sequestration concrete in Comparative Example 8 is prepared without adding bamboo fibers, which greatly reduces the flexural strength of the product, indicating the important role of bamboo fibers in improving the flexural strength of the carbon sequestration concrete.

[0086] The above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, which should be covered in the scope of the claims of the present application. The technical, shape, and structure parts not described in detail in the present application are well-known technologies.

Claims

1. A carbon sequestration concrete material based on Masson's pine blight, characterized in that, The carbon fixation concrete material comprises the following raw materials: Masson pine blight, bamboo fiber, magnesium oxide, magnesium chloride, fly ash, wood wax acid, disodium hydrogen phosphate, octadecyl dimethyl betaine, sodium lauryl isethionate.

2. The carbon sequestration concrete material based on Masson's pine blight according to claim 1, characterized in that, The content of active magnesium oxide in the magnesium oxide is greater than or equal to 85%.

3. A method for preparing a carbon sequestration concrete material based on Masson's pine blight, characterized by, The preparation method of the carbon fixation concrete material is specifically as follows: (1) The wood wax acid is heated to 90 DEG C and stirred to dissolve, then the disodium hydrogen phosphate and the octadecyl dimethyl betaine are added and uniformly mixed, and then the mixture is naturally cooled to room temperature and ground to 100 mesh to obtain disodium hydrogen phosphate composite particles; (2) The bamboo fiber is soaked in a 20-30wt% magnesium chloride solution for 10-30 minutes, taken out and drained to obtain pretreated bamboo fiber; the masson pine blight is collected and crushed to a particle size of 1-6 mm, then 300mg / L abamectin is sprayed for disinfection treatment, and after the disinfection is completed, the pretreated masson pine material is soaked in a 40-50wt% magnesium chloride solution for 20-40 minutes, taken out and drained to obtain pretreated masson pine material, and the pretreated bamboo fiber is added to the pretreated masson pine material and uniformly mixed to obtain a crushed material; (3) The crushed material is placed in water and stirred and dispersed, then heated to 80-90 DEG C and treated for 1-2 hours, then cooled to 40-60 DEG C, and the sodium lauryl isethionate is added, the pH is adjusted to 7.5-8.5, and then the mixture is continuously stirred at a speed of 200-300 rpm for 2-4 hours, after the reaction is completed, the mixture is naturally cooled to room temperature, the filtrate is removed by filtration, then washed with clean water for 2-3 times, then the disodium hydrogen phosphate composite particles and the fly ash are added and uniformly mixed, and then the magnesium oxide and the magnesium chloride are added and uniformly mixed to obtain a mixed solid material, water is added to the mixed solid material and continuously stirred for 2-3 minutes, then poured into a mold, covered with a plastic film to keep the surface moist, and cured at room temperature to obtain the carbon fixation concrete material.

4. The method of claim 3, wherein the method is characterized by: In step (1), the mass ratio of the wood wax acid, the disodium hydrogen phosphate and the octadecyl dimethyl betaine is (1.6-2):(0.5-0.7):(0.1-0.2).

5. The method for preparing carbon-fixed concrete material based on Masson pine bark according to claim 4, characterized in that, In step (2), the mass ratio of the pretreated masson pine material and the pretreated bamboo fiber is (25-35):(6-7).

6. The method for preparing a carbon-fixing concrete material based on *Pinus massoniana* var. *mongolica* according to claim 5, characterized in that, In step (3), the mass ratio of the crushed material, the sodium lauryl isethionate, the disodium hydrogen phosphate composite particles, the fly ash, the magnesium oxide and the magnesium chloride is (30-40):(0.2-0.3):(2.1-2.8):(15-20):(25-35):(6-10).

7. The method for preparing a carbon-fixing concrete material based on *Pinus massoniana* var. *mongolica* according to claim 6, characterized in that, In step (3), the amount of water added to the mixed solid material is 35-45% of the mass of the mixed solid material.

8. The method for preparing carbon-fixed concrete material based on Masson pine twig according to claim 7, characterized in that, In step (3), the water added to the mixed solid material needs to be adjusted to a pH of 8.

9. A method for preparing carbon-fixed concrete material based on *Pinus massoniana* var. *mongolica* according to claim 8, characterized in that, In step (3), the curing time at room temperature is 7-15 days.

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