A cement activity enhancer and a method for preparing the same

Abstract

The application discloses a cement activity enhancer and a preparation method thereof, and belongs to the technical field of cement admixtures. The cement activity enhancer is prepared from the following raw materials in parts by weight: 60-80 parts of slag powder, 5-8 parts of an enhancer, 0.5-1 part of an activator, 1-3 parts of an inorganic salt and 3-5 parts of a dispersing agent. The cement activity enhancer is prepared from multiple raw materials, has a remarkable synergistic effect, promotes the cement hydration process in multiple directions, improves the bending and compressive strength of a cement test piece, reduces the usage amount of clinker and lowers the cement production cost.

Description

Technical Field

[0001] This invention belongs to the field of cement admixture technology, specifically relating to a cement activity enhancer and its preparation method. Background Technology

[0002] Concrete, with its advantages of wide availability, low cost, and simple construction, is widely used in infrastructure projects such as houses, roads and bridges, harbors, and dams. It is one of the most commonly used building materials in the civil engineering industry and also the world's second largest consumer of such materials. In recent years, my country has made large-scale investments in infrastructure such as transportation systems (highways and high-speed railways), urban infrastructure (buildings and subways), water conservancy (water storage and diversion projects), and power (power generation and transmission projects). A large number of public and civil facilities have been built or are planned, leading to an increasing demand for concrete. Although concrete has a series of advantages such as low price, abundant raw materials, ease of use, high compressive strength, and wide application range, due to inherent design flaws and environmental factors, some concrete may experience corrosion, alkali-aggregate reaction, freeze-thaw damage, and even cracking, seriously affecting the stability and safety of the structure. Sulfoaluminate cement has excellent properties such as high early strength, high impermeability, high freeze-thaw resistance, and strong corrosion resistance, and is currently one of the most widely used types of cement.

[0003] Cement active reinforcing agents can fully activate cement admixtures, thereby reducing the amount of cement clinker used, saving significant mineral resources and energy, and greatly reducing cement production costs. Currently, various cement reinforcing agents are available on the market, all possessing certain cement-strengthening effects. However, they all suffer from problems such as complex composition, poor compatibility with cement admixtures, poor strength enhancement effects, and unsatisfactory overall performance. Therefore, to overcome these shortcomings of common cement reinforcing agents, a new type of cement active reinforcing agent is needed that requires small dosage, has a good reinforcing effect, minimal impact on the standard consistency water requirement of cement, and no adverse effects on the compatibility with concrete admixtures. Summary of the Invention

[0004] This invention provides a cement active reinforcing agent. This cement active reinforcing agent is used in combination with a variety of raw materials, which has a significant synergistic effect. It works in multiple directions to promote the cement hydration process, improve the flexural and compressive strength of cement specimens, and reduce the cement production cost.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A cement active reinforcing agent is made from the following raw materials in parts by weight: 60-80 parts slag powder, 5-8 parts reinforcing agent, 0.5-1 part activator, 1-3 parts inorganic salt, and 3-5 parts dispersant.

[0007] Preferably, the slag powder is a mixture of diatomaceous earth, phosphorus slag, and graphene oxide in a mass ratio of 1:1:(0.05-0.08).

[0008] Preferably, the slag powder is prepared by the following method: diatomaceous earth, phosphorus slag and graphene oxide are mixed in a certain mass ratio and added to a ball mill, the ball mill speed is set to 200-300 r / min, and the mixture is ball-milled for 30 min.

[0009] Preferably, the reinforcing agent is composed of nano-calcium carbonate and modified nano-silica in a mass ratio of 2:1, wherein the nano-calcium carbonate has a particle size of 100 nm.

[0010] Preferably, the modified nano-silica is prepared by the following method:

[0011] Step 1: Weigh silica nanoparticles, add an appropriate amount of deionized water, sonicate at room temperature for 20 min, then heat to 45℃ and hold at that temperature for 15 min to obtain a silica nanoparticle dispersion; the silica nanoparticles have a particle size of 20-60 nm.

[0012] Step 2: Add 0.5 g of perfluorooctyltriethoxysilane and 10 ml of 5% acetic acid solution to the silica nano-dispersion, stir and heat to 80°C, react for 30 min, and then dry the suspension at 80°C for 8 h to constant weight to obtain modified nano-silica.

[0013] Preferably, the ratio of nano-silica to deionized water is 20g:100ml.

[0014] Preferably, the activator is composed of CaO and Na2SO4 in a mass ratio of 1:(0.5-0.8).

[0015] Preferably, the inorganic salt is NaCl or CaCl2.

[0016] Preferably, the dispersant is one of calcium lignosulfonate, sodium lignosulfonate, or sulfonated melamine-formaldehyde resin.

[0017] A method for preparing the above-mentioned cement active reinforcing agent includes the following steps:

[0018] (1) Preparation of slag powder;

[0019] (2) Prepare modified nano-silica, and mix nano-calcium carbonate and modified nano-silica evenly according to the mass ratio to obtain a reinforcing agent;

[0020] (3) Weigh the remaining raw materials by weight and mix them evenly with the slag powder and reinforcing agent.

[0021] The amount of cement active reinforcing agent prepared in this invention is 4-6‰ of the mass of cement.

[0022] Phosphorus slag is a product obtained by producing yellow phosphorus using phosphate rock, silica, and coke as raw materials in an electric furnace at a high temperature of 1400-1600℃, followed by rapid cooling with water. Its main minerals are wollastonite, sluice stone, and calcium silicate, with the main chemical components being CaO and SiO2, and small amounts of Al2O3, Fe2O3, MgO, and P2O5, exhibiting high potential activity. However, directly using phosphorus slag as an admixture in cement concrete typically results in long setting time and low early strength. This invention combines phosphorus slag, diatomaceous earth, and graphene oxide. Ball milling reduces the particle size of the slag powder, providing a suitable specific surface area. Furthermore, the ball milling process enhances the interaction between the components, increasing friction and refining the particles. This process disrupts the structure of some crystals, exposing more active sites and increasing the amount of amorphous gel involved in the hydration reaction, thus improving cement activity.

[0023] The reinforcing agent of this invention is made from a specific ratio of nano-calcium carbonate and modified nano-silica. Although nano-calcium carbonate also possesses the advantages common to nanomaterials with high specific surface area, its activity is relatively low. In contrast, the modified nano-silica of this invention bonds silanol groups, fluorosilane groups, and other groups to the surface of silica nanoparticles, improving the dispersibility of nanoparticles and the surface activity of the groups. When used in combination with nano-calcium carbonate, the two can produce a synergistic effect, further enhancing the surface group activity and nanoparticle dispersibility. Together, they promote the formation of CSH active groups during the cement hydration process, significantly improving the compressive strength of cement.

[0024] The activator used in this invention, when mixed with mineral micropowder, promotes the disintegration of the crystal structure in the mineral micropowder particles under suitable conditions, releasing more active SiO2 and Al2O3, and reacting with SO4. 2- The reaction of Ca(OH)2 and other substances generates products such as AFt and hydrated calcium silicate gel (CSH), which better ensures the strength of the cement system.

[0025] The beneficial effects of this invention are as follows: Under the combined action of the activator, reinforcing agent, and mineral micro powder, the mineral micro powder releases a large amount of active SiO2 and Al2O3. SiO2 and Al2O3 react with Ca(OH)2 produced by cement hydration to generate a large number of hydration products such as CSH, C2ASH8, and C4AH13. This promotes the cement hydration process. At the same time, the hydration products and nanoparticles fill the voids after the cement paste has set, reduce the porosity of the cement paste after setting, improve the flexural and compressive strength of the specimens, reduce the amount of cement clinker used, and improve the overall performance of cement, showing good application prospects. Attached Figure Description

[0026] Figure 1 These are TEM images of the nano-silica in the reinforcing agent of this invention before and after modification; a) is before modification, and b) is after modification. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to specific embodiments, but it is not limited thereto.

[0028] Unless otherwise specified, all raw materials used in this invention were commercially available. Nano-silica was purchased from Nanjing Hongde Nanomaterials Co., Ltd., with an average particle size of 20 nm; phosphorus slag was purchased from a yellow phosphorus manufacturer in Jining City, Shandong Province, with a density of 2.89 g / cm³. 3 Specific surface area is 430m² 2 / kg, and its specific composition is shown in Table 1 below:

[0029] Table 1 Main chemical composition of phosphorus slag

[0030]

[0031] Example 1

[0032] A cement active reinforcing agent is made from the following raw materials in parts by weight: 60 parts slag powder, 5 parts reinforcing agent, 0.5 parts activator, 1 part inorganic salt, and 3 parts dispersant.

[0033] The slag powder is a mixture of diatomaceous earth, phosphorus slag, and graphene oxide in a mass ratio of 1:1:0.05.

[0034] The slag powder is prepared by the following method: diatomaceous earth, phosphorus slag and graphene oxide are mixed in a certain mass ratio and added to a ball mill. The ball mill speed is set to 200-300 r / min and the powder is milled for 30 min.

[0035] The reinforcing agent is composed of nano-calcium carbonate and modified nano-silica in a mass ratio of 2:1, wherein the nano-calcium carbonate has a particle size of 100 nm.

[0036] The modified nano-silica was prepared using the following method:

[0037] Step 1: Weigh silica nanoparticles, add an appropriate amount of deionized water, sonicate at room temperature for 20 min, then heat to 45℃ and hold at that temperature for 15 min to obtain silica nano-dispersion; The ratio of the amount of nano-silica to deionized water is 20g:100ml.

[0038] Step 2: Add 0.5 g of perfluorooctyltriethoxysilane and 10 ml of 5% acetic acid solution to the silica nano-dispersion, stir and heat to 80°C, react for 30 min, and then dry the suspension at 80°C for 8 h to constant weight to obtain modified nano-silica.

[0039] The activator is composed of CaO and Na2SO4 in a mass ratio of 1:0.5.

[0040] The inorganic salt is NaCl.

[0041] The dispersant is one of calcium lignosulfonate, sodium lignosulfonate, or sulfonated melamine-formaldehyde resin.

[0042] A method for preparing the above-mentioned cement active reinforcing agent includes the following steps:

[0043] (1) Preparation of slag powder;

[0044] (2) Prepare modified nano-silica, and mix nano-calcium carbonate and modified nano-silica evenly according to the mass ratio to obtain a reinforcing agent;

[0045] (3) Weigh the remaining raw materials by weight and mix them evenly with the slag powder and reinforcing agent.

[0046] Example 2

[0047] A cement active reinforcing agent is made from the following raw materials in parts by weight: 70 parts slag powder, 7 parts reinforcing agent, 0.8 parts activator, 2 parts inorganic salt, and 4 parts dispersant.

[0048] The slag powder is a mixture of diatomaceous earth, phosphorus slag, and graphene oxide in a mass ratio of 1:1:0.06.

[0049] The slag powder is prepared by the following method: diatomaceous earth, phosphorus slag and graphene oxide are mixed in a certain mass ratio and added to a ball mill. The ball mill speed is set to 200-300 r / min and the powder is milled for 30 min.

[0050] The reinforcing agent is composed of nano-calcium carbonate and modified nano-silica in a mass ratio of 2:1, wherein the nano-calcium carbonate has a particle size of 100 nm.

[0051] The modified nano-silica was prepared using the following method:

[0052] Step 1: Weigh silica nanoparticles, add an appropriate amount of deionized water, sonicate at room temperature for 20 min, then heat to 45℃ and hold at that temperature for 15 min to obtain silica nano-dispersion; The ratio of the amount of nano-silica to deionized water is 20g:100ml.

[0053] Step 2: Add 0.5 g of perfluorooctyltriethoxysilane and 10 ml of 5% acetic acid solution to the silica nano-dispersion, stir and heat to 80°C, react for 30 min, and then dry the suspension at 80°C for 8 h to constant weight to obtain modified nano-silica.

[0054] The activator is composed of CaO and Na2SO4 in a mass ratio of 1:0.7.

[0055] The inorganic salt is CaCl2.

[0056] The dispersant is one of calcium lignosulfonate, sodium lignosulfonate, or sulfonated melamine-formaldehyde resin.

[0057] A method for preparing the above-mentioned cement active reinforcing agent includes the following steps:

[0058] (1) Preparation of slag powder;

[0059] (2) Prepare modified nano-silica, and mix nano-calcium carbonate and modified nano-silica evenly according to the mass ratio to obtain a reinforcing agent;

[0060] (3) Weigh the remaining raw materials by weight and mix them evenly with the slag powder and reinforcing agent.

[0061] Example 3

[0062] A cement active reinforcing agent is made from the following raw materials in parts by weight: 80 parts slag powder, 8 parts reinforcing agent, 1 part activator, 3 parts inorganic salt, and 5 parts dispersant.

[0063] The slag powder is a mixture of diatomaceous earth, phosphorus slag, and graphene oxide in a mass ratio of 1:1:0.08.

[0064] The slag powder is prepared by the following method: diatomaceous earth, phosphorus slag and graphene oxide are mixed in a certain mass ratio and added to a ball mill. The ball mill speed is set to 200-300 r / min and the powder is milled for 30 min.

[0065] The reinforcing agent is composed of nano-calcium carbonate and modified nano-silica in a mass ratio of 2:1, wherein the nano-calcium carbonate has a particle size of 100 nm.

[0066] The modified nano-silica was prepared using the following method:

[0067] Step 1: Weigh silica nanoparticles, add an appropriate amount of deionized water, sonicate at room temperature for 20 min, then heat to 45℃ and hold at that temperature for 15 min to obtain silica nano-dispersion; The ratio of the amount of nano-silica to deionized water is 20g:100ml.

[0068] Step 2: Add 0.5 g of perfluorooctyltriethoxysilane and 10 ml of 5% acetic acid solution to the silica nano-dispersion, stir and heat to 80°C, react for 30 min, and then dry the suspension at 80°C for 8 h to constant weight to obtain modified nano-silica.

[0069] The activator is composed of CaO and Na2SO4 in a mass ratio of 1:0.8.

[0070] The inorganic salt is CaCl2.

[0071] The dispersant is one of calcium lignosulfonate, sodium lignosulfonate, or sulfonated melamine-formaldehyde resin.

[0072] A method for preparing the above-mentioned cement active reinforcing agent includes the following steps:

[0073] (1) Preparation of slag powder;

[0074] (2) Prepare modified nano-silica, and mix nano-calcium carbonate and modified nano-silica evenly according to the mass ratio to obtain a reinforcing agent;

[0075] (3) Weigh the remaining raw materials by weight and mix them evenly with the slag powder and reinforcing agent.

[0076] Example 4

[0077] A cement active reinforcing agent is made from the following raw materials in parts by weight: 65 parts slag powder, 7 parts reinforcing agent, 0.6 parts activator, 2 parts inorganic salt, and 3 parts dispersant.

[0078] The slag powder is a mixture of diatomaceous earth, phosphorus slag, and graphene oxide in a mass ratio of 1:1:0.05.

[0079] The slag powder is prepared by the following method: diatomaceous earth, phosphorus slag and graphene oxide are mixed in a certain mass ratio and added to a ball mill. The ball mill speed is set to 200-300 r / min and the powder is milled for 30 min.

[0080] The reinforcing agent is composed of nano-calcium carbonate and modified nano-silica in a mass ratio of 2:1, wherein the nano-calcium carbonate has a particle size of 100 nm.

[0081] The modified nano-silica was prepared using the following method:

[0082] Step 1: Weigh silica nanoparticles, add an appropriate amount of deionized water, sonicate at room temperature for 20 min, then heat to 45℃ and hold at that temperature for 15 min to obtain silica nano-dispersion; the ratio of the amount of nano-silica to deionized water is 20g:100ml.

[0083] Step 2: Add 0.5 g of perfluorooctyltriethoxysilane and 10 ml of 5% acetic acid solution to the silica nano-dispersion, stir and heat to 80°C, react for 30 min, and then dry the suspension at 80°C for 8 h to constant weight to obtain modified nano-silica.

[0084] The activator is composed of CaO and Na2SO4 in a mass ratio of 1:0.8.

[0085] The inorganic salt is CaCl2.

[0086] The dispersant is one of calcium lignosulfonate, sodium lignosulfonate, or sulfonated melamine-formaldehyde resin.

[0087] A method for preparing the above-mentioned cement active reinforcing agent includes the following steps:

[0088] (1) Preparation of slag powder;

[0089] (2) Prepare modified nano-silica, and mix nano-calcium carbonate and modified nano-silica evenly according to the mass ratio to obtain a reinforcing agent;

[0090] (3) Weigh the remaining raw materials by weight and mix them evenly with the slag powder and reinforcing agent.

[0091] Comparative Example 1

[0092] A cement active reinforcing agent, whose principle and composition are basically the same as those in Example 4, the only difference being that the reinforcing agent is nano-calcium carbonate.

[0093] Comparative Example 2

[0094] A cement active reinforcing agent, whose principle and composition are basically the same as in Example 4, the only difference being that the reinforcing agent is modified nano-silica.

[0095] Comparative Example 3

[0096] A cement active reinforcing agent, whose principle and composition are basically the same as those in Example 4, the only difference being that the reinforcing agent is composed of nano-calcium carbonate and unmodified nano-silica in a mass ratio of 2:1.

[0097] Comparative Example 4

[0098] A cement active reinforcing agent, whose principle and composition are basically the same as in Example 4, the only difference being that the slag powder is diatomaceous earth.

[0099] Comparative Example 5

[0100] A cement active reinforcing agent, whose principle and composition are basically the same as in Example 4, the only difference being that the slag powder is phosphorus slag.

[0101] Comparative Example 6

[0102] A cement active reinforcing agent, whose principle and composition are basically the same as in Example 4, the only difference being that the slag powder is graphene oxide.

[0103] Comparative Example 7

[0104] A cement activator, whose principle and composition are basically the same as in Example 4, the only difference being that the activator is CaO.

[0105] Comparative Example 8

[0106] A cement active reinforcing agent, whose principle and composition are basically the same as those in Example 4, the only difference being that the activator is Na2SO4.

[0107] Application Example 1

[0108] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 1; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: cement clinker 72%, fly ash 23%, and limestone 5%. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0109] Application Example 2

[0110] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 1; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 75% cement clinker, 20% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0111] Application Example 3

[0112] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 1; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 70% cement clinker, 25% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0113] Application Example 4

[0114] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 2; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: cement clinker 72%, fly ash 23%, and limestone 5%. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0115] Application Example 5

[0116] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 2; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 75% cement clinker, 20% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0117] Application Example 6

[0118] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 1; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 70% cement clinker, 25% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0119] Application Example 7

[0120] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 3; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: cement clinker 72%, fly ash 23%, and limestone 5%. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0121] Application Example 8

[0122] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 3; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 75% cement clinker, 20% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0123] Application Example 9

[0124] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 3; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 70% cement clinker, 25% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0125] Application Example 10

[0126] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 3; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: cement clinker 72%, fly ash 23%, and limestone 5%. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0127] Application Example 11

[0128] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 4; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 75% cement clinker, 20% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0129] Application Example 12

[0130] A type of cement is composed of cementitious material and cement activating and reinforcing agent prepared in Example 4; the amount of cement activating and reinforcing agent is 5‰ of the weight of cementitious material; the mass percentage composition of the cementitious material is: 70% cement clinker, 25% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0131] Application Comparative Example 1

[0132] A type of cement is composed of cementitious materials; the cementitious materials are composed of the following mass percentages: 80% cement clinker, 15% fly ash, and 5% limestone. The cement is obtained by mixing the above materials and grinding them in a cement test mill.

[0133] Application effect test

[0134] To further illustrate the effectiveness of the present invention, performance tests were conducted on cement prepared using the cement activator prepared in Examples 1-4 of the present invention in Application Examples 1-12 and the cement prepared using Comparative Example 1. The tests included cement standard consistency water requirement, setting time, soundness test method (GB / T 1346-2005); cement mortar fluidity test standard (GB / T 2419-2005); and cement mortar strength test method (GB / T 17671-1999). The results are shown in Table 2.

[0135] Table 2 Performance Test Results

[0136]

[0137] As shown in Table 1, compared with Comparative Example 1, the 3-day and 28-day strengths of cement prepared using the cement active reinforcing agent of Examples 1-4 of the present invention are comparable to or slightly higher than those of Comparative Example 1. This indicates that after using the cement active reinforcing agent of the present invention, the amount of cement clinker used is reduced by about 10%, but the same effect can still be achieved, thereby achieving the goal of reducing cement costs.

[0138] Cement was prepared by incorporating the cement activator prepared in Examples 1-4 and Comparative Examples 1-8 into cement base materials at a dosage of 5‰. The mass percentage composition of the cement base materials was: 70% cement clinker, 25% fly ash, and 5% limestone. The blank control was cement base materials without any cement activator. The performance of the prepared cement was tested: cement standard consistency water requirement, setting time, soundness test method (GB / T 1346-2005); cement mortar fluidity test standard (GB / T 2419-2005); cement mortar strength test method (GB / T 17671-1999). The results are shown in Table 3.

[0139] Table 3 Performance Test Results

[0140]

[0141] As can be seen from the data in Table 2 above, compared with the blank comparative example, the 3-day and 28-day compressive strength and flexural strength of the cement in comparative examples 1-3 were improved, but the overall strength improvement effect was lower than that of the cement prepared in examples 1-4. This is mainly because the present invention uses a reasonable ratio of nano-calcium carbonate and modified nano-silica for synergistic effect. The hydroxyl groups on the surface of the modified nano-SiO2 are replaced by perfluorooctyltriethoxysilane, which reduces the surface energy and the tendency to agglomerate (e.g., Figure 1As shown in the figure, it exhibits good dispersibility, and silanol, fluorosilane, and other groups are bonded to the surface of silica nanoparticles, enhancing the surface activity of the nanoparticle groups. The combined effect of these two types of nanoparticles promotes the formation of CSH active groups during the cement hydration process, significantly improving the cement's compressive strength. Compared to the blank control, the cement in Comparative Examples 4-6 showed improved 3-day and 28-day compressive and flexural strengths, but the overall strength improvement was lower than that of the cement prepared in Examples 1-4. This is mainly because the present invention combines phosphorus slag, diatomaceous earth, and graphene oxide in appropriate proportions, which interact with other reinforcing agents and activators, allowing more active raw materials to participate in the hydration reaction and promoting the increase of amorphous gels during the process, thus better improving cement strength. Compared with the blank control, Comparative Examples 7-8 showed a weaker overall effect in improving cement strength. This indicates that a single activator has a weak activating effect on the cement of this invention. Only when two activators are in an appropriate ratio do they work synergistically. After being mixed with mineral powder, they promote the disintegration of the crystal structure in the mineral powder particles, releasing more active SiO2 and Al2O3, and reacting with SO4. 2- The reaction of Ca(OH)₂ and other materials generates AFt, calcium silicate hydrate gel (CSH), and other products, which better ensures the strength of the cement system. Changing the composition and amount of any of the raw materials will not achieve the effect described in this invention.

[0142] It should be noted that the above embodiments are merely some preferred embodiments of the present invention, and not all embodiments. Obviously, based on the above embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

Claims

1. A cement activation enhancer, characterized in that, It is made from the following raw materials in parts by weight: 60-80 parts slag powder, 5-8 parts reinforcing agent, 0.5-1 part activator, 1-3 parts inorganic salt, and 3-5 parts dispersant; The slag powder is a mixture of diatomaceous earth, phosphorus slag, and graphene oxide in a mass ratio of 1:1:(0.05-0.08). The slag powder is prepared by the following method: diatomaceous earth, phosphorus slag and graphene oxide are mixed in a certain mass ratio and added to a ball mill. The ball mill speed is set to 200-300 r / min and the powder is milled for 30 min. The reinforcing agent is composed of nano-calcium carbonate and modified nano-silica in a mass ratio of 2:1, wherein the nano-calcium carbonate has a particle size of 100nm. The modified nano-silica was prepared using the following method: Step 1: Weigh silica nanoparticles, add an appropriate amount of deionized water, sonicate at room temperature for 20 min, then heat to 45℃ and hold at that temperature for 15 min to obtain silica nanoparticle dispersion. Step 2: Add 0.5 g of perfluorooctyltriethoxysilane and 10 ml of 5% acetic acid solution to the silica nano-dispersion, stir and heat to 80°C, react for 30 min, and then dry the suspension at 80°C for 8 h to constant weight to obtain modified nano-silica.

2. The cement activity enhancer according to claim 1, characterized in that, The ratio of nano-silica to deionized water is 20g:100ml.

3. The cement activity enhancer according to claim 1, characterized in that, The activator is composed of CaO and Na2SO4 in a mass ratio of 1:(0.5-0.8).

4. The cement activity enhancer according to claim 1, characterized in that, The inorganic salt is NaCl or CaCl2.

5. The cement activity enhancer according to claim 1, characterized in that, The dispersant is one of calcium lignosulfonate, sodium lignosulfonate, or sulfonated melamine-formaldehyde resin.

6. A method for preparing the cement active reinforcing agent according to any one of claims 1-5, characterized in that, It includes the following steps: (1) Preparation of slag powder; (2) Prepare modified nano-silica, and mix nano-calcium carbonate and modified nano-silica evenly according to the mass ratio to obtain a reinforcing agent; (3) Weigh the remaining raw materials by weight and mix them evenly with the slag powder and reinforcing agent.

Images