Highly pressure-resistant concrete and method for producing same

Abstract

The application relates to the technical field of concrete materials, and particularly discloses high-compressive-strength concrete and a preparation method thereof, the high-compressive-strength concrete comprising the following components in parts by mass: water 100 parts; cement 338-342 parts; fly ash 24-28 parts; aggregate 1100-1150 parts; modified filler 65-69 parts; additive 6.9-7.1 parts; the modified filler is obtained by modifying aluminum nitride powder with a modified liquid; and the modified liquid is compounded by water, ethanol, sodium p-styrenesulfonate and n-octadecyl phosphate ester. The application has the advantage that the compressive strength of the concrete can be significantly improved without adjusting the water-cement ratio.

Description

Technical Field

[0001] This invention relates to the field of concrete materials, and in particular to a high compressive strength concrete and its preparation method. Background Technology

[0002] As a core material in the modern construction industry, concrete's compressive strength has a decisive impact on the overall safety and service life of buildings. With the rapid development of the construction industry, the requirements for concrete's compressive strength are becoming increasingly stringent.

[0003] To improve the compressive strength of concrete, the water-cement ratio is usually reduced. However, while reducing the water-cement ratio does increase the strength of the concrete after curing, the reduced water content leads to decreased flowability and a sharp decline in its workability. Although adding high-efficiency water-reducing agents can effectively reduce water usage while maintaining the workability of the concrete, once the water content is low enough, even adding water-reducing agents can only maintain good flowability. Therefore, there are significant limitations to improving the compressive strength of concrete by reducing the water-cement ratio, making it difficult to meet the strength improvement requirements of engineering projects. Thus, there is still room for improvement. Summary of the Invention

[0004] In order to significantly improve the compressive strength of concrete without adjusting the water-cement ratio, this application provides a high compressive strength concrete and a method for preparing the same.

[0005] This application provides a high-compression-strength concrete and its preparation method, which adopts the following technical solution:

[0006] In a first aspect, this application provides a high-compressive-strength concrete, employing the following technical solution:

[0007] A high compressive strength concrete comprises the following components in parts by weight:

[0008] 100 parts water;

[0009] 338-342 parts cement;

[0010] 24-28 parts fly ash;

[0011] 1100-1150 parts aggregate;

[0012] 65-69 parts of modified filler;

[0013] Additive dosage: 6.9-7.1 parts;

[0014] The modified filler is obtained by modifying aluminum nitride powder with a modifying liquid;

[0015] The modified liquid is composed of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate.

[0016] By adopting the above technical solution, and modifying aluminum nitride powder with a modifying liquid composed of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate, the addition of modified filler can significantly improve the compressive strength of concrete without adjusting the water-cement ratio. This results in a significant increase in concrete strength without significantly affecting the workability of the concrete.

[0017] Preferably, the mass ratio of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate is 50-60:40-50:4-6:9-11.

[0018] By adopting the above technical solution and specifically selecting the mass ratio of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate, the modification effect of the modified liquid on aluminum nitride powder is better, the modified filler can better improve the strength of concrete, and the quality of concrete is higher.

[0019] Preferably, the modification method of the modified filler is as follows:

[0020] Aluminum nitride powder is mixed with the modification liquid, heated to 45-50℃, stirred for 4-5 hours, filtered, and dried to obtain the modified filler.

[0021] By adopting the above technical solution and stirring at 45-50℃ for 4-5 hours, the modification effect of the modified liquid on aluminum nitride powder is better, the modified filler obtained has a better modification effect on concrete, and the strength of concrete is improved.

[0022] Preferably, the mass ratio of aluminum nitride powder to modified liquid is 1:0.8-1.2.

[0023] By adopting the above technical solutions, the modification effect is better, the modified filler can better improve the strength of concrete, resulting in higher concrete quality, and the construction performance is basically unaffected.

[0024] Preferably, the aluminum nitride powder has a particle size of 5-10 μm.

[0025] By adopting the above technical solution and specifically selecting aluminum nitride powder with a particle size of 5-10μm, the modified filler can significantly improve the strength of concrete, better fill the voids in the concrete, make the concrete denser, and maintain better workability.

[0026] Preferably, the admixture is a compound of water-reducing agent and early-strength agent, and the mass ratio of water-reducing agent to early-strength agent is 4.5-4.6:2.4-2.5.

[0027] By adopting the above technical solutions, the workability of concrete is improved, and the quality of the cured concrete is more uniform and its performance is better.

[0028] Preferably, the aggregate is a blend of fine and coarse aggregates, and the mass ratio of the fine and coarse aggregates is 450-475:650-675.

[0029] By adopting the above technical solutions, it is beneficial to improve the density of concrete, resulting in better concrete performance and higher strength.

[0030] Secondly, this application provides a method for preparing high-compressive-strength concrete, employing the following technical solution:

[0031] A method for preparing the above-mentioned high compressive strength concrete includes the following steps:

[0032] Step 1) Mix cement, fly ash, modified filler, and admixture evenly to obtain a premix;

[0033] Step 2), add aggregate to the premix and mix well to obtain a mixture;

[0034] Step 3): Add water to the mixture and mix well to obtain concrete mix.

[0035] Step 4) Pour the concrete mix into the mold, cure, demold, and obtain high compressive strength concrete.

[0036] By adopting the above technical solution, the concrete produced has high fluidity and good workability before curing, and high strength and good quality after curing.

[0037] In summary, this application has the following beneficial effects:

[0038] 1. Because this application modifies aluminum nitride powder by using a modifying liquid composed of water, ethanol, sodium p-styrene sulfonate and octadecyl phosphate, the addition of modified filler can significantly improve the compressive strength of concrete without adjusting the water-cement ratio, thereby greatly improving the concrete strength while not significantly affecting the workability of the concrete.

[0039] 2. In this application, by specifically selecting the mass ratio of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate, the modification effect of the modified liquid on aluminum nitride powder is better, the modified filler can better improve the strength of concrete, and the quality of concrete is higher.

[0040] 3. In this application, it is preferred to stir the mixture at 45-50℃ for 4-5 hours to improve the modification effect of the modified liquid on aluminum nitride powder, thereby improving the modification effect of the prepared modified filler on concrete and enhancing the strength of concrete. Detailed Implementation

[0041] The present application will be further described in detail below with reference to the embodiments.

[0042] Example 1

[0043] A high-compressive-strength concrete is prepared from the following components:

[0044] Water, cement, fly ash, aggregates, modified fillers, and admixtures.

[0045] The cement is ordinary Portland cement, Runfeng cement, with a factory specification of P.O42.5R.

[0046] The fly ash is commercially available and is classified as Grade I fly ash.

[0047] The aggregate is a mixture of fine and coarse aggregates.

[0048] The fine aggregate is river sand, sourced from commercially available sources, 20 mesh.

[0049] The coarse aggregate is basalt crushed stone, sourced from commercially available sources, with a particle size of 15-20mm.

[0050] The modified filler is obtained by modifying aluminum nitride powder with a modifying liquid.

[0051] The modification solution is composed of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate, with a mass ratio of 50:40:4:9.

[0052] Aluminum nitride powder was purchased from Dongguan Dongchao New Material Technology Co., Ltd., CAS No.: 24304-00-5, 5μm.

[0053] The ethanol is anhydrous ethanol, sourced from commercially available sources, with a concentration of 99.5%, CAS number: 64-17-5.

[0054] Sodium p-styrene sulfonate is commercially available, CAS No.: 2695-37-6.

[0055] Octadecyl phosphate is commercially available, CAS No.: 4724-47-4.

[0056] The modification methods for modified fillers are as follows:

[0057] Mix 100 kg of aluminum nitride powder with 80 kg of modification liquid, heat to 45 °C, stir at 60 r / min for 4 h, filter, and dry at 110 °C to obtain the modified filler.

[0058] The admixture is a combination of water-reducing agent and early-strength agent.

[0059] The water-reducing agent is a polycarboxylate water-reducing agent, purchased from Jinan Quanchi New Materials Co., Ltd.

[0060] The early strength agent is calcium ammonium nitrate, which is commercially available and has the CAS number 15245-12-2.

[0061] The preparation method of high compressive strength concrete includes the following steps:

[0062] Step 1): Add 338 kg of cement, 24 kg of fly ash, 65 kg of modified filler, 4.5 kg of polycarboxylate superplasticizer, and 2.4 kg of calcium ammonium nitrate into a mixing tank. Stir at 120 r / min for 15 min until the mixture is homogeneous to obtain a premix.

[0063] Step 2): Add 450 kg of river sand and 650 kg of basalt gravel to the premix, stir at 60 r / min for 10 min until the mixture is homogeneous, and obtain the mixture.

[0064] Step 3) Add 100kg of water to the mixture, stir at 60r / min for 5min until it is evenly mixed to obtain concrete mix.

[0065] Step 4) Pour the concrete mix into the mold, water-cur it for 3 days, demold it, water-cur it for 7 days, and let it stand for 28 days to obtain high compressive strength concrete.

[0066] Example 2

[0067] A high-compressive-strength concrete is prepared from the following components:

[0068] Water, cement, fly ash, aggregates, modified fillers, and admixtures.

[0069] The cement is ordinary Portland cement, Runfeng cement, with a factory specification of P.O42.5R.

[0070] The fly ash is commercially available and is classified as Grade I fly ash.

[0071] The aggregate is a mixture of fine and coarse aggregates.

[0072] The fine aggregate is river sand, sourced from commercially available sources, 20 mesh.

[0073] The coarse aggregate is basalt crushed stone, sourced from commercially available sources, with a particle size of 15-20mm.

[0074] The modified filler is obtained by modifying aluminum nitride powder with a modifying liquid.

[0075] The modification solution is composed of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate, with a mass ratio of 55:45:5:10.

[0076] Aluminum nitride powder was purchased from Dongguan Dongchao New Material Technology Co., Ltd., CAS No.: 24304-00-5, 5μm.

[0077] The ethanol is anhydrous ethanol, sourced from commercially available sources, with a concentration of 99.5%, CAS number: 64-17-5.

[0078] Sodium p-styrene sulfonate is commercially available, CAS No.: 2695-37-6.

[0079] Octadecyl phosphate is commercially available, CAS No.: 4724-47-4.

[0080] The modification methods for modified fillers are as follows:

[0081] Mix 100 kg of aluminum nitride powder with 100 kg of modification liquid, heat to 48 °C, stir at 60 r / min for 4.5 h, filter, and dry at 110 °C to obtain the modified filler.

[0082] The admixture is a combination of water-reducing agent and early-strength agent.

[0083] The water-reducing agent is a polycarboxylate water-reducing agent, purchased from Jinan Quanchi New Materials Co., Ltd.

[0084] The early strength agent is calcium ammonium nitrate, which is commercially available and has the CAS number 15245-12-2.

[0085] The preparation method of high compressive strength concrete includes the following steps:

[0086] Step 1): Add 340kg of cement, 26kg of fly ash, 67kg of modified filler, 4.55kg of polycarboxylate superplasticizer, and 2.45kg of calcium ammonium nitrate into a mixing tank. Stir at 120r / min for 15min until the mixture is homogeneous to obtain a premix.

[0087] Step 2): Add 462.5 kg of river sand and 662.5 kg of basalt gravel to the premix, stir at 60 r / min for 10 min until the mixture is homogeneous, and obtain the mixture.

[0088] Step 3) Add 100kg of water to the mixture, stir at 60r / min for 5min until it is evenly mixed to obtain concrete mix.

[0089] Step 4) Pour the concrete mix into the mold, water-cur it for 3 days, demold it, water-cur it for 7 days, and let it stand for 28 days to obtain high compressive strength concrete.

[0090] Example 3

[0091] A high-compressive-strength concrete is prepared from the following components:

[0092] Water, cement, fly ash, aggregates, modified fillers, and admixtures.

[0093] The cement is ordinary Portland cement, Runfeng cement, with a factory specification of P.O42.5R.

[0094] The fly ash is commercially available and is classified as Grade I fly ash.

[0095] The aggregate is a mixture of fine and coarse aggregates.

[0096] The fine aggregate is river sand, sourced from commercially available sources, 20 mesh.

[0097] The coarse aggregate is basalt crushed stone, sourced from commercially available sources, with a particle size of 15-20mm.

[0098] The modified filler is obtained by modifying aluminum nitride powder with a modifying liquid.

[0099] The modification solution is composed of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate, with a mass ratio of 60:50:6:11.

[0100] Aluminum nitride powder was purchased from Dongguan Dongchao New Material Technology Co., Ltd., CAS No.: 24304-00-5, 10μm.

[0101] The ethanol is anhydrous ethanol, sourced from commercially available sources, with a concentration of 99.5%, CAS number: 64-17-5.

[0102] Sodium p-styrene sulfonate is commercially available, CAS No.: 2695-37-6.

[0103] Octadecyl phosphate is commercially available, CAS No.: 4724-47-4.

[0104] The modification methods for modified fillers are as follows:

[0105] Mix 100 kg of aluminum nitride powder with 120 kg of modification liquid, heat to 50 °C, stir at 60 r / min for 5 h, filter, and dry at 110 °C to obtain the modified filler.

[0106] The admixture is a combination of water-reducing agent and early-strength agent.

[0107] The water-reducing agent is a polycarboxylate water-reducing agent, purchased from Jinan Quanchi New Materials Co., Ltd.

[0108] The early strength agent is calcium ammonium nitrate, which is commercially available and has the CAS number 15245-12-2.

[0109] The preparation method of high compressive strength concrete includes the following steps:

[0110] Step 1): Add 342 kg of cement, 28 kg of fly ash, 69 kg of modified filler, 4.6 kg of polycarboxylate superplasticizer, and 2.5 kg of calcium ammonium nitrate into a mixing tank. Stir at 120 r / min for 15 min until the mixture is homogeneous to obtain a premix.

[0111] Step 2): Add 475 kg of river sand and 675 kg of basalt gravel to the premix, stir at 60 r / min for 10 min until the mixture is homogeneous, and obtain the mixture.

[0112] Step 3) Add 100kg of water to the mixture, stir at 60r / min for 5min until it is evenly mixed to obtain concrete mix.

[0113] Step 4) Pour the concrete mix into the mold, water-cur it for 3 days, demold it, water-cur it for 7 days, and let it stand for 28 days to obtain high compressive strength concrete.

[0114] Example 4

[0115] A high-compressive-strength concrete, compared with Example 2, differs only in that:

[0116] The modification methods for modified fillers are as follows:

[0117] Mix 100 kg of aluminum nitride powder with 100 kg of modification liquid, stir at room temperature and 60 r / min for 4.5 h, filter, and dry at 110 °C to obtain the modified filler.

[0118] Comparative Example 1

[0119] A high-compressive-strength concrete, compared with Example 2, differs only in that:

[0120] In the modified solution, sodium tripolyphosphate is used to replace sodium p-styrene sulfonate in an equal amount.

[0121] Sodium tripolyphosphate was purchased from Henan Honglilai Chemical Technology Co., Ltd., CAS No.: 7785-84-4.

[0122] Comparative Example 2

[0123] A high-compressive-strength concrete, compared with Example 2, differs only in that:

[0124] In the modified solution, cyclohexylaminopropyltrimethoxysilane is used to replace octadecyl phosphate in an equal amount.

[0125] Cyclohexylaminopropyltrimethoxysilane was purchased from Hangzhou Jessica Chemical Co., Ltd., CAS No.: 3068-78-8.

[0126] Comparative Example 3

[0127] A high-compressive-strength concrete, compared with Example 2, differs only in that:

[0128] In the modified solution, sodium tripolyphosphate is used to replace sodium p-styrene sulfonate in equal amounts, and cyclohexylaminopropyltrimethoxysilane is used to replace octadecyl phosphate in equal amounts.

[0129] Sodium tripolyphosphate was purchased from Henan Honglilai Chemical Technology Co., Ltd., CAS No.: 7785-84-4.

[0130] Cyclohexylaminopropyltrimethoxysilane was purchased from Hangzhou Jessica Chemical Co., Ltd., CAS No.: 3068-78-8.

[0131] Comparative Example 4

[0132] A high-compressive-strength concrete, compared with Example 2, differs only in that:

[0133] The modified filler was replaced with an equal amount of calcium carbonate whiskers.

[0134] Calcium carbonate whiskers were purchased from Shijiazhuang Supermicro New Materials Technology Co., Ltd., 3000 mesh.

[0135] Experiment 1

[0136] The 7-day compressive strength and 28-day compressive strength of the concrete mixtures prepared according to the GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete" were tested.

[0137] The specific test data for Experiment 1 are detailed in Table 1.

[0138] Table 1

[0139] 7-day compressive strength (MPa) 28-day compressive strength (MPa) Example 1 55.9 73.2 Example 2 56.3 73.7 Example 3 56.6 74.2 Example 4 54.6 71.6 Comparative Example 1 50.8 66.6 Comparative Example 2 50.5 66.1 Comparative Example 3 49.8 65.3 Comparative Example 4 49.5 64.9

[0140] According to the data comparison of each embodiment and comparative example in Table 1, the compressive strength of each embodiment is significantly higher than that of each comparative example. It can be seen that adding the modified filler obtained by modifying aluminum nitride powder with a modifying liquid to concrete can significantly improve the strength of concrete. When the modifying liquid is composed of water, ethanol, sodium p-styrene sulfonate and octadecyl phosphate, the modification effect on aluminum nitride powder is significantly improved. The modified filler has a very significant effect on improving the strength of concrete, which is significantly higher than that of concrete filled with calcium carbonate whiskers.

[0141] Each embodiment achieves a significant increase in concrete strength without adjusting the water-cement ratio. Since there is no need to drastically reduce the amount of water, the concrete mix has better fluidity and construction performance.

[0142] The compressive strength of Example 4 is lower than that of Example 2. It can be seen that the modification effect is better when stirring at 45-50℃ during the preparation of the modified filler, while stirring at room temperature will lead to a poorer modification effect, which in turn will reduce the effect of improving the concrete strength.

[0143] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-compressive-strength concrete, characterized in that: The components include the following parts by mass: 100 parts water; 338-342 parts cement; 24-28 parts fly ash; 1100-1150 parts aggregate; 65-69 parts of modified filler; Additive dosage: 6.9-7.1 parts; The modification method of the modified filler is as follows: Aluminum nitride powder is mixed with the modification liquid, heated to 45-50℃, stirred for 4-5 hours, filtered, and dried to obtain the modified filler; The modified liquid is composed of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate.

2. The high compressive strength concrete according to claim 1, characterized in that: In the modified solution, the mass ratio of water, ethanol, sodium p-styrene sulfonate, and octadecyl phosphate is 50-60:40-50:4-6:9-11.

3. The high compressive strength concrete according to claim 2, characterized in that: The mass ratio of aluminum nitride powder to the modified liquid is 1:0.8-1.

2.

4. The high compressive strength concrete according to claim 3, characterized in that: The aluminum nitride powder has a particle size of 5-10 μm.

5. The high compressive strength concrete according to claim 1, characterized in that: The admixture is a compound of water-reducing agent and early-strength agent, and the mass ratio of water-reducing agent to early-strength agent is 4.5-4.6:2.4-2.

5.

6. The high compressive strength concrete according to claim 1, characterized in that: The aggregate is a mixture of fine and coarse aggregates, with a mass ratio of 450-475:650-675 for fine and coarse aggregates.

7. A method for preparing high compressive strength concrete according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1), mix cement, fly ash, modified filler and admixture evenly to obtain premix; Step 2), add aggregate to the premix and mix well to obtain a mixture; Step 3), add water to the mixture and mix well to obtain concrete mix; Step 4) Pour the concrete mix into the mold, cure, demold, and obtain high compressive strength concrete.