Concrete

Abstract

The invention discloses concrete, which is prepared from the following raw materials in parts by weight: 230 to 250 parts of cement, 100 to 110 parts of slag powder, 60 to 65 parts of fly ash, 400 to 420 parts of washed sand, 220 to 240 parts of stone powder, 265 to 280 parts of fine sand, 770 to 800 parts of stone with the particle size of 10 to 20 mm, 190 to 200 parts of stone with the particle size of 5 to 10 mm, 95 to 100 parts of mixing water and 7 to 10 parts of additives. Through reasonable proportioning of concrete raw materials, the problems of segregation, bleeding and the like caused by unreasonable proportioning in the past are avoided, and the strength and durability of the concrete are greatly improved, so that the maintenance and replacement cost of a project is reduced, the safety of the project is improved, and the service life of the project is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of building materials, and particularly to a kind of concrete. Background Art

[0002] With the acceleration of the global urbanization process, the demand for building materials in the construction industry continues to grow. As one of the main structural materials in modern architecture, the demand for concrete has also climbed. Whether it is for residential, commercial facilities or infrastructure, concrete plays an irreplaceable role.

[0003] With the acceleration of the urbanization process and infrastructure construction, the market demand for concrete shows a diversified feature. Besides the traditional housing construction field, the demand for high-performance and special concrete in fields such as transportation, water conservancy, and energy is increasing continuously. This provides a broad market space for the further development of the concrete industry.

[0004] In order to meet the market demand and cope with challenges, concrete technology is constantly innovating. The application of new mixing technologies, efficient construction methods, and intelligent technologies makes the production and construction of concrete more efficient and environmentally friendly. At the same time, the application of new composite materials and nanotechnology has opened up a new path for the development of concrete. Therefore, how to prepare high-performance concrete has become a key issue that cannot be ignored in the current construction industry. Summary of the Invention

[0005] Aiming at the above technical problems, the purpose of the present invention is to provide a kind of high-performance concrete.

[0006] To achieve the purpose of the present invention, the present invention is realized through the following technical solutions: A kind of concrete, by weight parts, includes the following raw materials: 230 - 250 parts of cement, 100 - 110 parts of slag powder, 60 - 65 parts of fly ash, 400 - 420 parts of washed sand, 220 - 240 parts of stone powder, 265 - 280 parts of fine sand, 770 - 800 parts of stones with a particle size of 10 - 20 mm, 190 - 200 parts of stones with a particle size of 5 - 10 mm, 95 - 100 parts of mixing water, and 7 - 10 parts of admixture.

[0007] Further, the admixture includes polycarboxylate superplasticizer, curcumin, and optical fiber, and their weight ratio is: 6 - 8: 0.3 - 0.5: 0.3 - 0.5.

[0008] Further, the weight ratio of the polycarboxylate superplasticizer, curcumin, and optical fiber is 7: 0.4: 0.5.

[0009] Further, the solid content of the polycarboxylate superplasticizer is 36.7% and the water reducing rate is 26.7%.

[0010] Further, the cement used is P•O 42.5 cement, with an apparent density of 3081 kg / m 3 .

[0011] Further, the slag powder used is S95 slag powder, with an apparent density of 2859 kg / m 3 .

[0012] Further, a certain amount of modified rubber particles is incorporated into the concrete.

[0013] Further, the preparation method of the modified rubber particles is as follows: S1: Mix rubber particles of different particle sizes with sodium silicate so that a layer of sodium silicate uniformly covers the surface of the rubber particles; S2: Add the blend product of rubber particles and sodium silicate to mixture powder A containing silica powder, silicon phosphate, urea, and hydroxypropyl methyl cellulose and stir. When a layer of mixture powder A uniformly coats the surface of the rubber particles, stop stirring and screen to obtain intermediate product B, and recycle the remaining mixture powder A; S3: Add the intermediate product B to a drum mixer, spray a small amount of sodium silicate and add mixture powder A so that a layer of mixture powder A uniformly coats the surface of the intermediate product B; S4: Repeat step S3 3 - 4 times, then dry at 60 °C for 3 h to finally obtain the modified rubber particles.

[0014] Advantages of the present invention: 1. By reasonably proportioning the concrete raw materials, the present invention avoids problems such as segregation and bleeding caused by unreasonable previous proportions, greatly improves the strength and durability of the concrete, thereby reducing the engineering maintenance and replacement costs, and enhancing the safety and service life of the project.

[0015] 2. Incorporating a certain amount of modified rubber particles into the concrete of the present invention can improve its freeze-thaw cycle resistance and also improve the concrete's chloride ion penetration resistance to a certain extent. Specific embodiments

[0016] The present invention will be described in detail below in conjunction with embodiments. Embodiment

[0017] A kind of concrete, by weight, includes the following raw materials: 230 parts of cement, 100 parts of slag powder, 60 parts of fly ash, 400 parts of washed sand, 220 parts of stone powder, 265 parts of fine sand, 770 parts of stones with a particle size of 10 - 20 mm, 190 parts of stones with a particle size of 5 - 10 mm, 95 parts of mixing water, and 7 parts of admixture. Among them, the admixture includes polycarboxylate water reducer, curcumin, and optical fiber, and their mass ratio is 6:0.3:0.3.

[0018] Preferably, P•O 42.5 cement is used as the cement, and the apparent density is 3081 kg / m 3 , and S95 slag powder is used as the slag powder, and the apparent density is 2859 kg / m 3 .

[0019] Preferably, the polycarboxylate water reducer is a low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer. The low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer introduces an unsaturated alkyl phosphate triester monomer into the main chain to adjust the branched structure of the polycarboxylate water reducer molecule, increase the adsorption thickness of the polycarboxylate water reducer in concrete preparation, and reduce the plastic viscosity of the concrete. Therefore, the solid content of the low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer is 36.7%, and the water reduction rate is 26.7%, making the prepared concrete have low-carbon function.

[0020] Through the reasonable proportioning of the concrete raw materials, the present invention avoids problems such as segregation and bleeding that occurred in the past due to unreasonable proportioning. The measured apparent density is 2361 kg / m 3 , greatly improving the strength and durability of the concrete, thereby reducing the engineering maintenance and replacement costs, and improving the safety and service life of the project.

[0021] By adding optical fibers to the admixture in this embodiment, problems such as stress, deformation, and cracks of the concrete structure can be determined, and automatic monitoring and automatic diagnosis of stress, deformation, and cracks of the low-carbon concrete structure can be realized. Since distributed monitoring can be achieved during the sensing process of the optical fiber, even if problems such as stress changes, structural deformation, and cracks occur in the concrete, the state of the concrete can be monitored in real time. Therefore, by adding optical fibers, the comprehensive performance of the concrete is improved. Example

[0022] A kind of concrete, by weight, comprises the following raw materials: 250 parts of cement, 110 parts of slag powder, 65 parts of fly ash, 420 parts of washed sand, 240 parts of stone powder, 280 parts of fine sand, 800 parts of stones with a particle size of 10 - 20 mm, 200 parts of stones with a particle size of 5 - 10 mm, 100 parts of mixing water, and 10 parts of admixture. Among them, the admixture includes polycarboxylate water reducer, curcumin, and optical fiber, and their weight ratio is: 8:0.5:0.5.

[0023] Preferably, P•O 42.5 cement is used as the cement, and the apparent density is 3081 kg / m 3 , and S95 slag powder is used as the slag powder, and the apparent density is 2859 kg / m 3 .

[0024] Preferably, the polycarboxylate water reducer is a low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer. This low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer introduces an unsaturated alkyl phosphate triester monomer into the main chain to adjust the branched structure of the polycarboxylate water reducer molecule, increase the adsorption thickness of the polycarboxylate water reducer in concrete preparation, and reduce the plastic viscosity of the concrete. Therefore, the solid content of the low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer is 36.7%, and the water reduction rate is 26.7%, enabling the prepared concrete to have low-carbon functions.

[0025] Through the reasonable proportioning of the concrete raw materials, the present invention avoids problems such as segregation and bleeding that occurred due to unreasonable proportioning in the past. The measured apparent density is 2360 kg / m 3 , greatly improving the strength and durability of the concrete, thereby reducing the engineering maintenance and replacement costs and enhancing the safety and service life of the project.

[0026] By adding optical fibers to the additive in this embodiment, problems such as stress, deformation, and cracks in the concrete structure can be determined, and automatic monitoring and automatic diagnosis of the stress, deformation, and cracks of the low-carbon concrete structure can be achieved. Since distributed monitoring can be realized during the sensing process of the optical fiber, even if problems such as stress changes, structural deformation, and cracks occur in the concrete, the state of the concrete can be monitored in real time. Therefore, by adding optical fibers, the comprehensive performance of the concrete is improved. Example

[0027] A kind of concrete, by weight, includes the following raw materials: 240 parts of cement, 105 parts of slag powder, 63 parts of fly ash, 410 parts of washed sand, 230 parts of stone powder, 270 parts of fine sand, 775 parts of stones with a particle size of 10 - 20 mm, 195 parts of stones with a particle size of 5 - 10 mm, 97 parts of mixing water, and 9 parts of additive. The additive includes a polycarboxylate water reducer, curcumin, and optical fibers, and their weight ratio is 7:0.4:0.5.

[0028] Preferably, the cement used is P•O 42.5 cement, and the apparent density is 3081 kg / m 3 , and the slag powder used is S95 slag powder, and the apparent density is 2859 kg / m 3 .

[0029] Preferably, the polycarboxylate water reducer is a low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer. This low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer introduces an unsaturated alkyl phosphate triester monomer into the main chain to adjust the branched structure of the polycarboxylate water reducer molecule, increase the adsorption thickness of the polycarboxylate water reducer in concrete preparation, and reduce the plastic viscosity of the concrete. Therefore, the solid content of the low-carbon and environmentally friendly viscosity-reducing polycarboxylate water reducer is 36.7%, and the water reduction rate is 26.7%, enabling the prepared concrete to have low-carbon functions.

[0030] Through the reasonable proportioning of concrete raw materials, the present invention avoids problems such as segregation and bleeding that occurred due to unreasonable proportioning in the past. After actual measurement, the apparent density is 2363 kg / m 3 , greatly improving the strength and durability of concrete, thereby reducing the project maintenance and replacement costs and enhancing the safety and service life of the project.

[0031] By adding optical fibers to the admixture of this embodiment, problems such as stress, deformation, and cracks of the concrete structure can be determined, and automatic monitoring and automatic diagnosis of the stress, deformation, and cracks of the low-carbon concrete structure can be realized. Since distributed monitoring can be achieved during the sensing process of optical fibers, even if problems such as stress changes, structural deformation, and cracks occur in the concrete, the state of the concrete can be monitored in real time. Therefore, by adding optical fibers, the comprehensive performance of the concrete is improved. Example

[0032] A kind of concrete, by weight, comprises the following raw materials: 234 parts of cement, 102 parts of slag powder, 62 parts of fly ash, 404 parts of washed sand, 222 parts of stone powder, 267 parts of fine sand, 770 parts of stones with a particle size of 10 - 20 mm, 190 parts of stones with a particle size of 5 - 10 mm, 95 parts of mixing water, and 7 parts of admixture. Among them, the admixture includes polycarboxylate water reducer, curcumin, and optical fibers, and their mass ratio is 6:0.4:0.3. Then, 8% of modified rubber particles are incorporated into the concrete.

[0033] Through testing, the incorporation of modified rubber particles in the concrete has an important influence on the freeze-thaw cycle resistance performance, and the optimal dosage of the modified rubber particles is 8%. The reason is as follows: The modified rubber particles act as elastomers in the concrete. Under the action of freeze-thaw cycles, they can undergo certain deformations, weakening the generation of internal stress in the concrete, inhibiting the generation and propagation of internal micro-cracks, and improving its frost resistance; the incorporated modified rubber particles introduce a large number of air bubbles, refining the internal pores of the concrete to a certain extent, improving the internal pore structure of the concrete, increasing the internal porosity of the concrete, and thus effectively alleviating the expansion pressure. Moreover, when the dosage of the modified rubber particles is 8%, the impact resistance performance is significantly improved. The reason is that the modified rubber particles have a certain elasticity. Under the action of impact loads, the modified rubber particles distributed in the concrete deform to dissipate more energy, thereby reducing the kinetic energy acting on the matrix and enhancing the toughness of the concrete. Example

[0034] The difference from the above-mentioned Example 4 is that this embodiment also provides a preparation method of the modified rubber particles, and the specific steps are as follows: S1: Mix rubber particles with different particle sizes with sodium silicate so that a layer of sodium silicate is evenly covered on the surface of the rubber particles; S2: Add the blend product of rubber particles and sodium silicate to the mixture powder A containing silica powder, silicon phosphate, urea, and hydroxypropyl methylcellulose, and stir. Stop stirring and screen when a layer of mixture powder A is evenly coated on the surface of the rubber particles to obtain the intermediate product B, and recycle the remaining mixture powder A; S3: Add the intermediate product B to a drum mixer, spray a small amount of sodium silicate and add the mixture powder A to evenly coat a layer of mixture powder A on the surface of the intermediate product B; S4: After repeating step S3 for 3 - 4 times, dry at 60 °C for 3 h to finally obtain modified rubber particles.

[0035] The modified rubber particles prepared through the above steps mainly achieve the modification purpose by coating a layer of inorganic material with strong affinity for concrete inorganic materials on the surface of the rubber particles, so as to improve the bonding strength between the rubber particles and concrete materials.

[0036] The modified rubber particles prepared in this example mainly consist of two layers. The inner layer is rubber particles, and the outer layer is wrapped with an organic - inorganic composite shell layer structure with silica powder as the main structure. Among them, sodium silicate and the curing agent silicon phosphate in the outer shell layer structure undergo a curing reaction at high temperature at the interface between the rubber particles and the outer shell layer and in the outer shell layer to generate a Si - O network structure, strengthening the interface between the two phases and the outer shell layer structure.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention; therefore, although this specification has described the present invention in detail with reference to the above - mentioned various embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced; and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. A kind of concrete, characterized in that, By weight, it includes the following raw materials: 230 - 250 parts of cement, 100 - 110 parts of slag powder, 60 - 65 parts of fly ash, 400 - 420 parts of washed sand, 220 - 240 parts of stone powder, 265 - 280 parts of fine sand, 770 - 800 parts of stones with a particle size of 10 - 20 mm, 190 - 200 parts of stones with a particle size of 5 - 10 mm, 95 - 100 parts of mixing water, and 7 - 10 parts of admixture.

2. The concrete according to claim 1, wherein: The admixture includes polycarboxylate superplasticizer, curcumin, and optical fiber, and their weight ratio is: 6 - 8: 0.3 - 0.5: 0.3 - 0.

5.

3. The concrete according to claim 2, wherein: The weight ratio of the polycarboxylate superplasticizer, curcumin, and optical fiber is 7: 0.4: 0.

5.

4. The concrete according to claim 3, characterized in that: The solid content of the polycarboxylate superplasticizer is 36.7% and the water reduction rate is 26.7%.

5. The concrete according to claim 4, wherein: The cement used is P•O 42.5 cement, with an apparent density of 3081 kg / m 3 .

6. The concrete according to claim 5, wherein: The slag powder used is S95 slag powder, with an apparent density of 2859 kg / m 3 .

7. The concrete according to claim 6, characterized in that: A certain amount of modified rubber particles are also incorporated into the concrete.

8. The concrete according to claim 7, wherein: The preparation method of the modified rubber particles is as follows: S1: Mix rubber particles with different particle sizes with sodium silicate so that a layer of sodium silicate uniformly covers the surface of the rubber particles. S2: Add the blend product of rubber particles and sodium silicate to mixture powder A containing silica powder, silicon phosphate, urea, and hydroxypropyl methylcellulose for stirring. When a layer of mixture powder A uniformly coats the surface of the rubber particles, stop stirring and screen to obtain intermediate product B, and recycle the remaining mixture powder A. S3: Add the intermediate product B to a drum mixer, spray a small amount of sodium silicate and add mixture powder A so that a layer of mixture powder A uniformly coats the surface of the intermediate product B. S4: Repeat step S3 for 3 - 4 times, and then dry at 60 °C for 3 h to finally obtain the modified rubber particles.