CN114349401A - High-performance concrete and preparation method thereof - Google Patents
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Abstract
The application relates to the technical field of concrete, and particularly discloses high-performance concrete, a preparation method and a preparation method thereof, wherein the high-performance concrete comprises the following components in parts by weight: 450 parts of cement 390-containing materials, 160 parts of gravel 120-containing materials, 150 parts of fly ash 120-containing materials, 60-120 parts of quartz powder, 15-30 parts of polycarboxylic acid water reducing agent, 20-55 parts of steel fiber, 6-13 parts of water-absorbing resin, 30-80 parts of rice hull ash, 8-30 parts of carbon nano tubes and 280 parts of water 160-containing materials; the high-strength concrete prepared by the method has stronger anti-permeability performance, and simultaneously has higher compressive strength, compactness and cracking resistance, so that various performances of the concrete at low temperature are optimized and improved.
Description
Technical Field
The application relates to the technical field of concrete, in particular to high-performance concrete and a preparation method thereof.
Background
Ordinary concrete is a general name of composite materials formed by cementing materials and aggregate cements, is commonly used for bridge construction, house construction, road construction and the like, common cement is used as the cementing materials, sand stones are used as the aggregate, chemical admixtures and mineral admixtures are added if necessary, and a finished product is obtained by stirring, compacting and forming, curing and hardening according to a certain proportion.
Along with the development of building economy in China, a large number of building facilities are raised, concrete is required to be used along with the development, most projects have the conditions of heavy tasks, short construction period and the like, and many projects need to be constructed continuously in winter. However, in the conventional concrete, the concrete is prone to be frozen in a low-temperature environment, so that the compactness of the concrete is affected, and the impermeability of the concrete is reduced.
Therefore, there is still a need for a high strength concrete with high compaction and high impermeability.
Disclosure of Invention
In order to solve the problems of low compactness and low impermeability of concrete, the first object of the application is to provide a high-performance concrete.
The second purpose of the invention is to provide a preparation method of high-performance concrete, which has the advantages of simple operation, high compactness and high impermeability.
In order to achieve the first object, the invention provides the following technical scheme:
the high-performance concrete comprises the following components in parts by weight: 450 parts of cement, 120 parts of gravel, 160 parts of fly ash, 150 parts of fly ash, 60-120 parts of quartz powder, 15-30 parts of polycarboxylic acid water reducing agent, 20-55 parts of steel fiber, 6-13 parts of water-absorbing resin, 30-80 parts of rice hull ash, 8-30 parts of carbon nano tube and 280 parts of water 160.
By adopting the technical scheme, cement, the broken stones and water are mixed to generate a gelation effect, and the broken stones are mutually bonded by the cement coating, so that a water permeable structure with continuous gaps is formed. The addition of the quartz powder into the concrete can improve the corrosion resistance of the concrete and has high early strength. The addition of the fly ash improves the strength of concrete. Therefore, the coal ash, the quartz powder and the rice hull ash are added into the concrete to increase the compactness, the drying shrinkage, the crack resistance and the impermeability of the concrete, so that the strength grade of the concrete can be adjusted. Meanwhile, the crushed stone also has the effect of reducing shrinkage, cement paste has large shrinkage, and the crushed stone has the effects of inhibiting shrinkage and stabilizing the volume of concrete.
The addition of the steel fiber is beneficial to further improving the crack resistance of the concrete and reducing the cracking probability of the concrete, and the steel fiber, the rice husk ash and the quartz powder are matched to further improve the crack resistance, the impermeability and the compactness of the concrete in a low-temperature environment. The water-absorbent resin has strong water absorption performance, pores are formed in concrete after dehydration, the fly ash, the quartz powder and the carbon nano tubes are used for filling the pores, the freeze-thaw resistance of the concrete and the self-repairing function of the concrete are improved, the steel fiber is beneficial to bonding all components in a concrete system, the compactness and the impermeability of the concrete are further improved, and the stability of the concrete at low temperature is kept.
The carbon nano tube can not only play a micro-aggregate effect in concrete to fill the pores of the concrete, but also play the pozzolanic activity of nano materials, react with a cement hydration product Ca (OH) 2 to generate hydrated calcium silicate gel (C-S-H gel), improve the microstructure of the concrete, and improve the compactness, cracking resistance and impermeability of the concrete by matching with steel fiber and rice husk ash, so that various performances of the concrete at low temperature are optimized and improved.
Preferably, the weight ratio of the crushed stone to the fly ash to the steel fiber is 3-6:3-6.5: 1.
By adopting the technical scheme, the broken stone plays a skeleton role in the concrete, the contraction effect of the concrete is reduced, the system of the concrete is stabilized, the fly ash can play an active role in the concrete, gaps between cement and the broken stone become smaller, the filling effect is achieved, the compactness of the concrete structure can be improved, the steel fiber presents a three-dimensional disorderly distributed structure, the fly ash can effectively hinder the expansion of micro cracks in the concrete and the formation of macro cracks when being added into the concrete, the tensile strength, the bending resistance, the impact resistance and the fatigue resistance of the concrete are obviously improved, the ductility is better, the performances of the concrete at a low temperature are further improved, and the ratio of the broken stone, the fly ash and the steel fiber is in a specific range, so that the performances of the concrete are further improved.
Preferably, the weight ratio of the cement to the carbon nanotubes is 15-30: 1.
By adopting the technical scheme, the cement is a cementing material of the concrete, the cement is hydrated after meeting water to provide strength for the concrete, and is matched with the fly ash and the quartz powder to further improve the compactness and the impermeability of the concrete, the addition of the carbon nano tube can effectively improve the microstructure of the concrete, and the steel fiber and the fly ash are matched to increase the cohesiveness between the fly ash and the steel fiber so as to improve the compactness of the concrete and further improve the crack resistance and the impermeability of the concrete, and the ratio of the cement to the carbon nano tube is in a specific range, thereby further contributing to improving various performances of the concrete.
Preferably, the preparation method of the rice hull ash comprises the following steps:
(1) pretreatment: soaking rice hull in sulfuric acid for 60-90min, filtering, adding filtered rice hull into nitric acid, heating at 80-100 deg.C for 45-90min, washing to neutrality, and drying to obtain pretreated rice hull;
(2) firing: firing the pretreated rice hulls at the temperature of 300-500 ℃ for 60-120min, then continuing firing at the temperature of 800-1000 ℃ for 90-240min, and cooling to obtain rice hull ash;
(3) grinding: ball milling the rice hull ash at the rotation speed of 600-900r/min for 30-60min to obtain the rice hull ash powder.
By adopting the technical scheme, the rice hulls are soaked in sulfuric acid, so that the impurity content in the rice hull ash can be effectively reduced, most of metal impurities in the rice hull ash are converted into soluble inorganic matters to be removed, the pozzolanic activity of the rice hull ash is obviously improved, the content of silicon dioxide in the rice hulls is obviously improved, the rice hulls are subjected to nitric acid treatment at high temperature, the crystallization sensitivity of the rice hulls to combustion conditions is further reduced, and the quality of finished rice hull products is improved.
The rice hulls are calcined at high temperature, so that the content of crystalline silicon dioxide can be obviously reduced, the generation of amorphous silicon dioxide is promoted, the chemical activity is improved, and the residual carbon is reduced; subsequently, carrying out secondary heating calcination on the rice hulls to further improve the chemical activity of the rice hulls and enable the crystalline silicon dioxide in the rice hulls to be completely converted into amorphous silicon dioxide; and finally, ball milling is carried out, so that the particle size of the rice hull ash is reduced, and the rice hull ash system is uniform and stable.
Preferably, the weight ratio of the rice hulls to the nitric acid is 1: 9-15.
By adopting the technical scheme, the nitric acid corrodes lignin and cellulose in the rice hulls, so that cavities on the surfaces of the rice hulls are enlarged, cavities are generated in the rice hulls, and oxygen permeation and diffusion are facilitated during roasting, so that roasting products of the rice hulls are increased in activity and beneficial to subsequently improving various performances of concrete, and the ratio of the rice hulls to the nitric acid is in a specific range, so that the high activation degree of rice hull ash is further facilitated, and the subsequent improvement of compactness, impermeability and crack resistance of the concrete is facilitated.
Preferably, the fly ash is I-grade fly ash, the water requirement ratio is less than or equal to 95 percent, the ignition loss is less than or equal to 5 percent, and the specific surface area is more than or equal to 400m2/kg。
By adopting the technical scheme, the coal ash can reduce the hydration heat of the concrete, thereby reducing the hydration heat release, reducing the temperature of the concrete during construction, reducing cracks in the concrete caused by temperature stress, being suitable for low-temperature adaptation, being beneficial to improving the workability, the caking property and the water retention property of the concrete, and further improving the durability and the later strength of the concrete.
Preferably, the polycarboxylate superplasticizer is an NRF-H101 type superplasticizer.
By adopting the technical scheme, the workability of concrete can be improved by adding the water reducing agent, and the slurry of the concrete has better flowing property under the condition of extremely low water-to-gel ratio (W/B is less than or equal to 0.20) by adding the polycarboxylic acid water reducing agent based on a charge repulsion force dispersion mechanism and a steric hindrance effect; meanwhile, the polycarboxylic acid water reducer has the characteristics of low mixing amount, strong dispersing effect, small slump loss, early strength enhancement, good durability and the like, has the characteristic of good adaptability with cement and additives, and further improves the application stability of concrete at low temperature.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of high-performance concrete comprises the following steps:
s1, uniformly mixing the crushed stone, the fly ash and the steel fiber according to the proportion, and stirring at the rotating speed of 300-800r/min for 20-35min to obtain a mixture A;
s2, mixing the mixture A obtained in the step S1 with the rest components, and stirring at the temperature of 80-120 ℃, the stirring speed of 900-1500r/min and the stirring time of 30-50min to obtain the high-strength concrete.
In summary, the present application has the following beneficial effects:
1. the application of cement, rubble and water produce the gel effect after mixing, and cement parcel rubble makes the rubble bond each other to form the structure of permeating water that has continuous space. The addition of the quartz powder into the concrete can improve the corrosion resistance of the concrete and has high early strength. The addition of the fly ash improves the strength of concrete. Therefore, the coal ash, the quartz powder and the rice hull ash are added into the concrete to increase the compactness, the drying shrinkage, the crack resistance and the impermeability of the concrete, so that the strength grade of the concrete can be adjusted. Meanwhile, the crushed stone also has the effect of reducing shrinkage, cement paste has large shrinkage, and the crushed stone has the effects of inhibiting shrinkage and stabilizing the volume of concrete.
2. The carbon nano tube in the application can play a micro-aggregate effect in concrete, fill the pores of the concrete, play the pozzolanic activity of nano materials, react with a cement hydration product Ca (OH) 2 to generate hydrated calcium silicate gel (C-S-H gel), improve the microstructure of the concrete, and improve the compactness, cracking resistance and impermeability of the concrete by matching with steel fiber and rice husk ash, so that various performances of the concrete at a low temperature are optimized and improved.
3. The application of the fly ash enables gaps between cement and broken stones to become smaller, the filling effect is achieved, the compactness of a concrete structure can be improved, the steel fibers are in a three-dimensional disorderly distributed structure, the fly ash is added into the concrete, the expansion of micro cracks inside the concrete and the formation of macro cracks can be effectively hindered, the tensile, bending, impact and fatigue resistance of the concrete are further remarkably improved, and various performances of the concrete at a low temperature are further improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in the examples can be obtained commercially, wherein the fly ash is class I fly ash, the water requirement ratio is less than or equal to 95 percent, the loss on ignition is less than or equal to 5 percent, and the specific surface area is more than or equal to 400m2Per kg; the polycarboxylate superplasticizer is an NRF-H101 type superplasticizer.
Preparation method of rice hull ash
Preparation example 1
(1) Pretreatment: adding 100 parts by weight of rice hulls into sulfuric acid, soaking for 75min, filtering, adding the filtered rice hulls into nitric acid, heating at 90 ℃ for 60min, washing to be neutral, and drying to obtain pretreated rice hulls; the weight ratio of the rice hull to the nitric acid is 1: 12;
(2) firing: firing the pretreated rice hulls at 400 ℃ for 80min, then continuing firing at 900 ℃ for 180min, and cooling to obtain rice hull ash;
(3) grinding: and ball-milling the rice hull ash at the rotating speed of 700r/min for 45min to obtain rice hull ash powder.
Preparation example 2
(1) Pretreatment: adding 100 parts by weight of rice hulls into sulfuric acid, soaking for 60min, filtering, adding the filtered rice hulls into nitric acid, heating at the temperature of 80 ℃ for 45min, washing to be neutral, and drying to obtain pretreated rice hulls; the weight ratio of the rice hull to the nitric acid is 1: 9;
(2) firing: firing the pretreated rice hulls at 500 ℃ for 60min, then continuing firing at 800 ℃ for 240min, and cooling to obtain rice hull ash;
(3) grinding: and ball-milling the rice hull ash at the rotating speed of 600r/min for 30min to obtain rice hull ash powder.
Preparation example 3
(1) Pretreatment: adding 100 parts by weight of rice hulls into sulfuric acid, soaking for 90min, filtering, adding the filtered rice hulls into nitric acid, heating for 90min at the temperature of 100 ℃, washing to be neutral, and drying to obtain pretreated rice hulls; the weight ratio of the rice hull to the nitric acid is 1: 15;
(2) firing: firing the pretreated rice hulls at 300 ℃ for 120min, then continuing firing at 1000 ℃ for 90min, and cooling to obtain rice hull ash;
(3) grinding: and ball-milling the rice hull ash at the rotation speed of 900r/min for 60min to obtain rice hull ash powder.
Preparation example 4
The difference from preparation example 1 is that pretreatment: adding 100 parts by weight of rice hulls into nitric acid, heating for 60min at the temperature of 90 ℃, washing to be neutral, and drying to obtain pretreated rice hulls; the weight ratio of the rice hull to the nitric acid is 1: 12.
Preparation example 5
The difference from preparation example 1 is that the method for preparing rice hull ash does not include the grinding of step (3).
Preparation example 6
The difference from preparation example 1 is that firing: firing the pretreated rice hulls at 900 ℃ for 1800min, and cooling to obtain rice hull ash.
Examples
Example 1
A preparation method of high-performance concrete comprises the following steps:
s1, uniformly mixing the crushed stone, the fly ash and the steel fiber according to the proportion, and stirring for 30min at the rotating speed of 600r/min to obtain a mixture A;
and S2, mixing the mixture A obtained in the step S1 with the rest components, and stirring at the temperature of 100 ℃ at the stirring speed of 1200r/min for 45min to obtain the high-strength concrete.
The high-strength concrete comprises the following components in parts by weight: 420 parts of cement, 140 parts of crushed stone, 135 parts of fly ash, 100 parts of quartz powder, 25 parts of polycarboxylic acid water reducing agent, 35 parts of steel fiber, 10 parts of water-absorbent resin, 45 parts of rice hull ash, 20 parts of carbon nano tube and 220 parts of water;
the weight ratio of the broken stone to the fly ash to the steel fiber is 4:4.5: 1; the weight ratio of cement to carbon nanotubes is 25: 1;
the rice husk ash was selected from preparation example 1 of the method for preparing rice husk ash.
Example 2
A high-performance concrete, which is different from example 1 in that rice husk ash is selected from preparation example 2 of the method for preparing rice husk ash.
Example 3
A high performance concrete, differing from example 1 in that rice husk ash was selected from preparation example 3 of the method for preparing rice husk ash.
Example 4
A high performance concrete, differing from example 1 in that rice husk ash was selected from preparation example 4 of the method for preparing rice husk ash.
Example 5
A high performance concrete, differing from example 1 in that rice husk ash was selected from preparation example 5 of the method for preparing rice husk ash.
Example 6
A high performance concrete, differing from example 1 in that rice husk ash was selected from preparation example 6 of the method for preparing rice husk ash.
Example 7
The high-performance concrete is different from the concrete in example 1 in that the high-strength concrete comprises the following components in parts by weight: 390 parts of cement, 160 parts of broken stone, 120 parts of fly ash, 120 parts of quartz powder, 15 parts of polycarboxylic acid water reducing agent, 55 parts of steel fiber, 6 parts of water-absorbent resin, 80 parts of rice hull ash, 8 parts of carbon nano tube and 280 parts of water.
Example 8
A high-performance concrete, which is different from the embodiment 1 in that a preparation method of the high-performance concrete comprises the following steps:
s1, uniformly mixing the crushed stone, the fly ash and the steel fiber according to the proportion, and stirring at the rotating speed of 800r/min for 20min to obtain a mixture A;
and S2, mixing the mixture A obtained in the step S1 with the rest components, and stirring at the temperature of 120 ℃ at the stirring speed of 900r/min for 50min to obtain the high-strength concrete.
Example 9
A high performance concrete, differing from example 1 in that the weight ratio of crushed stone, fly ash and steel fibre was 3:3: 1.
Example 10
A high performance concrete, differing from example 1 in that the weight ratio of crushed stone, fly ash and steel fibre was 6:6.5: 1.
Example 11
A high performance concrete, differing from example 1 in that the weight ratio of cement to carbon nanotubes was 30: 1.
Example 12
A high performance concrete, differing from example 1 in that the weight ratio of cement to carbon nanotubes was 15: 1.
Comparative example
Comparative example 1
The high-performance concrete is different from the concrete in example 1 in that the concrete comprises the following components in parts by weight: 480 parts of cement, 100 parts of crushed stone, 160 parts of fly ash, 150 parts of quartz powder, 10 parts of polycarboxylic acid water reducing agent, 65 parts of steel fiber, 4 parts of water-absorbing resin, 20 parts of rice hull ash, 6 parts of carbon nano tube and 300 parts of water.
Comparative example 2
A high performance concrete, differing from example 1 in that equal amounts of steel fibers were substituted for the carbon nanotubes in the high strength concrete component.
Comparative example 3
A high performance concrete, differing from example 1 in that the rice hull ash was replaced with an equal amount of fly ash in the high strength concrete component.
Performance test
Carrying out early crack resistance tests on the high-strength concrete obtained in the examples 1-12 and the comparative examples 1-3, referring to GB/T50081-2016 (Standard for testing mechanical Properties of common concrete), and calculating the number of cracks in a unit area and the total crack area in the unit area after pouring concrete for 24 h;
the concrete samples (100 mm × 100mm × 100 mm) prepared in examples 1 to 12 and comparative examples 1 to 3 were subjected to negative temperature curing for 7 days and then to positive temperature curing for 28 days, so that the compressive strength of the concrete samples was obtained;
the concrete of each of examples 1 to 12 and comparative examples 1 to 3 was tested for impermeability according to the method described in GB/T50082-2009 standard for testing the long-term performance and durability of ordinary concrete, and the maximum water pressure when no water permeation occurred was obtained, with the results shown in table 1 below.
TABLE 1 results of performance test of high-strength concrete obtained in examples 1 to 12 and comparative examples 1 to 3
As can be seen from the data in Table 1, the high-strength concrete prepared in examples 1 to 12 has high compressive strength and seepage pressure resistance, and simultaneously has good early cracking resistance, and is suitable for low-temperature use; in examples 2-3, the change in each parameter in the method for preparing rice hull ash affects the performance of the high-strength concrete; in example 4, the pretreatment of the rice husk ash does not adopt sulfuric acid soaking, and the early crack resistance, the 28d compressive strength and the permeation resistance of the prepared concrete are slightly worse than those of example 1, which indicates that the sulfuric acid soaking of the rice husk ash affects the later treatment of the rice husk ash and further affects the performance of the concrete; in example 5, the preparation method of the rice husk ash is not ground, and the early crack resistance and the 28d compressive strength and the infiltration resistance of the concrete prepared subsequently are slightly worse than those of example 1, which indicates that the grinding affects the particle size of the rice husk ash and further the performance of the concrete; in example 6, the rice hull ash is directly treated at constant temperature during firing, and staged secondary firing is not adopted, so that the early crack resistance and the 28d compressive strength and the permeation resistance of the prepared concrete are slightly lower than those of example 1, which shows that staged firing of the rice hull ash influences the later treatment of the rice hull ash and further influences the performance of the concrete; examples 7-8 the component content of the concrete or various parameters in the preparation process were varied, and it can be seen from the data in table 1 that the variation in the component content or the variation in the parameters affects various properties of the concrete; examples 9-12 are changes in the ratio of some parameters in the concrete, and it can be seen from the data in table 1 that changes in the ratio of crushed stone, fly ash and steel fibers or changes in the ratio of cement to carbon nanotubes all affect various properties of the concrete, indicating that there is a synergistic effect between crushed stone, fly ash and steel fibers, and a synergistic effect between cement and carbon nanotubes, which in turn affects the properties of the concrete.
In the comparative example 1, the early crack resistance, the compressive strength of 28d and the permeation resistance of the comparative example 1 are far inferior to those of the example 1 by adjusting the component content in the high-strength concrete, which shows that the change of the component content of the high-strength concrete affects the early crack resistance, the compressive strength of 28d and the permeation resistance of the high-strength concrete; therefore, the change of the content of the components influences the comprehensive performance of the high-strength concrete.
In comparative example 2, the carbon nanotubes are replaced by the same amount of steel fibers, and the data in table 1 show that the early crack resistance, the compressive strength of 28d and the permeation resistance of the high-strength concrete are all deteriorated, so that the performance of adding the carbon nanotubes into the concrete is better than that of not adding the carbon nanotubes; the carbon nano tubes can not only fill the pores of the concrete, but also improve the microstructure of the concrete, thereby improving the compactness, cracking resistance and impermeability of the concrete, and optimizing and improving various performances of the concrete at low temperature.
In comparative example 3, the rice hull ash is replaced by the same amount of fly ash, and the data in table 1 show that the early crack resistance, the compressive strength of 28d and the permeation resistance of the high-strength concrete are all deteriorated, so that the rice hull ash prepared by the method influences various properties of the high-strength concrete, and shows that the rice hull ash added into the concrete can improve various properties of the concrete and can enhance the compactness, the crack resistance and the permeation resistance of the concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The high-performance concrete is characterized by comprising the following components in parts by weight: 450 parts of cement, 120 parts of gravel, 160 parts of fly ash, 150 parts of fly ash, 60-120 parts of quartz powder, 15-30 parts of polycarboxylic acid water reducing agent, 20-55 parts of steel fiber, 6-13 parts of water-absorbing resin, 30-80 parts of rice hull ash, 8-30 parts of carbon nano tube and 280 parts of water 160.
2. The high performance concrete of claim 1, wherein: the weight ratio of the broken stone to the fly ash to the steel fiber is 3-6:3-6.5: 1.
3. The high performance concrete of claim 1, wherein: the weight ratio of the cement to the carbon nano tubes is 15-30: 1.
4. The high performance concrete of claim 1, wherein: the preparation method of the rice hull ash comprises the following steps:
(1) pretreatment: soaking rice hull in sulfuric acid for 60-90min, filtering, adding filtered rice hull into nitric acid, heating at 80-100 deg.C for 45-90min, washing to neutrality, and drying to obtain pretreated rice hull;
(2) firing: firing the pretreated rice hulls at the temperature of 300-500 ℃ for 60-120min, then continuing firing at the temperature of 800-1000 ℃ for 90-240min, and cooling to obtain rice hull ash;
(3) grinding: ball milling the rice hull ash at the rotation speed of 600-900r/min for 30-60min to obtain the rice hull ash powder.
5. The high performance concrete of claim 4, wherein: the weight ratio of the rice hull to the nitric acid is 1: 9-15.
6. The high performance concrete of claim 1, wherein: the fly ash is I-grade fly ash, the water requirement ratio is less than or equal to 95 percent, the ignition loss is less than or equal to 5 percent, and the specific surface area is more than or equal to 400m2/kg。
7. The high performance concrete of claim 1, wherein: the polycarboxylate superplasticizer is an NRF-H101 type superplasticizer.
8. A method of producing a high strength concrete according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, uniformly mixing the crushed stone, the fly ash and the steel fiber according to the proportion, and stirring at the rotating speed of 300-800r/min for 20-35min to obtain a mixture A;
s2, mixing the mixture A obtained in the step S1 with the rest components, and stirring at the temperature of 80-120 ℃, the stirring speed of 900-1500r/min and the stirring time of 30-50min to obtain the high-strength concrete.
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| CN115594457A (en) * | 2022-09-14 | 2023-01-13 | 中建海龙科技有限公司（Cn） | Industrial tailing inorganic artificial stone with toughness and artistry and preparation method thereof |
| CN115594457B (en) * | 2022-09-14 | 2023-11-24 | 中建海龙科技有限公司 | Industrial tailing inorganic artificial stone with toughness and artistry and preparation method thereof |
| CN116332606A (en) * | 2023-04-11 | 2023-06-27 | 宁夏森淼新材料有限公司 | High-performance concrete and preparation method thereof |
| CN116922532A (en) * | 2023-07-20 | 2023-10-24 | 重庆大学溧阳智慧城市研究院 | Electromagnetic wave-absorbing concrete multilayer 3D printing path planning method |
| CN116922532B (en) * | 2023-07-20 | 2024-04-16 | 重庆大学溧阳智慧城市研究院 | Electromagnetic wave-absorbing concrete multilayer 3D printing path planning method |
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| CN114349401B (en) | 2022-11-18 |
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